Lunar and Planetary Institute






22st Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

Differentiation, Mixing and Cooling in a --Preliminary Considerations
Y. Abe
  1001

The Generation of Electric to the Crater Formation
V. V. Adushkin, S. P. Soloviev
  1002

SiC, and Si3N4 in Qingzhen (EH3)
C. M. O'd. Alexander, C. A. Prombo, P. D. Swan, R. M. Walker
  1003

Al-26 and Mn-53 in Antarctic and Non-Antarctic Meteorites
V. A. Alexeev
  1004

Comparison of the Exposure Ages of the Antarctic and Non-Antarctic H Chondrites
V. A. Alexeev
  1005

Exposure Ages of H Chondrites
V. A. Alexeev
  1006

Multiringed Impact Craters on Venus from Arecibo and Venera Images
J. S. Alexopoulos, W. B. McKinnon, V. J. Hillgren
  1007

Sterilization of Martian Samples by Gamma Irradiation
C. C. Allen
  1008

Impact-Wave Effects at the Cretaceous-Tertiary Boundary in Gulf of Mexico DSDP Cores
W. Alvarez, J. Smit, M. H. Anders, F. Asaro, F. J. M. R. Maurrasse, M. Kastner, W. Lowrie
  1009

The C, N, Al, and SI Isotopic Compositions of SiC Grain Size Separates from Murchison: Indirect Evidence for Highly Anomalous Grains
S. Amari, E. Zinner, R. S. Lewis
  1010

Development of a Sample Chamber for Thermal Infrared Emission Spectroscopy
D. L. Anderson, J. Carpenter, P. R. Christensen, P. W. Barbera
  1011

Discriminating Basalts Using Thermal Infrared Emission
D. L. Anderson, M. C. Malin, P. W. Barbera
  1012

The Structural Configuration of the Manson Impact Structure, Iowa, as Interpreted from Seismic Data and Confirmed by Drill Samples
R. R. Anderson, J. B. Hartung
  1013

The Model of Zodiacal Light Derived from Meteor Observations
V. V. Andreev, O. I. Belkovich
  1014

Tectonic Analysis of Meshkennet Regio of Venus from Venera 15 and 16 Data
V. Ansan, Ph. Masson, C. Sotin
  1015

Simulation of Crystallization and Geochemical Thermometry of Mare Crisium Magmatic Rocks
A. A. Ariskin, G. S. Barmina, M. Y. Frenkel
  1016

Magellan: Overview of Venus Surface Modification
R. E. Arvidson, V. R. Baker, C. Elachi, R. S. Saunders, J. A. Wood
  1017

Minor High Temperature Carbon Components Confirmed in Carbonaceous Chondrites by Stepped Combustion Using a New Sensitive Static Mass Spectrometer
R. D. Ash, S. S. Russell, I. P. Wright, C. T. Pillinger, J. W. Arden
  1018

A Numerical Laboratory for Fragmentation Studies: Some Insights into Collisional Processes and Outcomes
E. Asphaug, H. J. Melosh, E. Ryan
  1019

Chemical Fractionation of Siderophile Elements in Impactites from Australian Meteorite Craters
M. Attrep, C. J. Orth, L. R. Quintana, C. S. Shoemaker, E. M. Shoemaker, S. R. Taylor
  1020

Shock Induced Interaction Between Metal Iron and Silicates
D. D. Badjukov, T. L. Petrova
  1021

Chemistry of the Kara Impact Structure: Characteristics of Impact Melting and Excavation
D. D. Badjukov, M. A. Nazarov, L. D. Barsukova
  1022

Channels on Venus: an Overview
V. R. Baker, G. Komatsu, V. C. Gulick, J. S. Kargel, T. J. Parker
  1023

Ancient Oceans and Martian Paleohydrology
V. R. Baker, R. G. Storm, V. C. Gulick, J. S. Kargel, G. Komatsu, V. S. Kale
  1024

Detection of Nanophase Lepidocrocite (-FeOOH) in Iron-Smectite Mars Soil Analog Materials (Mar SAM)
A. Banin, D. F. Blake, T. Ben-Shlomo
  1025

Quantifying the Degradation State of Martian Impact Craters
N. G. Barlow
  1026

Analytical Studies of Impact Experiments Simulating Capture of Cosmic Dust in Silica Aerogel
R. A. Barrett, M. E. Zolensky
  1027

Mineral Compositions and assemblages in Chondrules of Indarch EH4 Chondrite
G. V. Baryshnikova, K. I. Ignatenko, A. K. Lavrukhina
  1028

Venera-8 Landing Site: Preliminary Analysis of Magellan Imagery
A. T. Basilevsky, M. A. Ivanov, O. V. Nikolayeva
  1029

Cleopatra Crater on Venus: Happy Solution of the Volcanic vs. Impact Crater Controversy
A. T. Basilevsky, G. G. Schaber
  1030

Cathodoluminescence of Equilibr6ated and Unequilibrated Eucrites and the Discovery of Multiple Silica Populations
J. D. Batchelor
  1031

Thermal History of the LEW 85300, 85302, 85303 Shocked Eucrites: Thermoluminescence of Individual Clasts and Matrix
J. D. Batchelor, D. W. G. Sears
  1032

Naming the Newly Found Landforms on Venus
R. M. Batson, J. F. Russell
  1033

Photopolarimetric Studies of Resident Space Objects
W. I. Beavers, S. Tapia, J. Y. K. Cho
  1034

Nitrogen and 129Xe in a Metal-rich Separate of the Acapulco Meteorite
R. H. Becker
  1035

CCD Narrowband Filter Imaging of Mars During the 1990 Opposition
J. F. Bell III
  1036

Near-Infrared (1.3-4.0 micron) Imaging Spectroscopy of Mars
J. F. Bell III, D. A. Crisp
  1037

CCD Narrowband Filter Imaging of Lunar Crater Rays
J. F. Bell III, B. R. Hawke
  1038

High Spectral Resolution 0.4-0.8 micron Observations of Mars During 1988 and 1990
J. F. Bell III, T. B. McCord, P. G. Lucey, T. A. Ozoroski
  1039

Thermally Altered Palagonitic Tephra as a Martian Soil Analog?
J. F. Bell III, R. V. Morris, J. B. Adams
  1040

What are S-type Asteroids Made Of? (and Will Gaspra Tell Us?)
J. F. Bell
  1041

The Galileo Solid State Imaging Experiment and Performance of the Camera at Earth-Moon Encounter
M. Blton, J. W. Head, C. Chapman, K. Klasen, C. Anger, M. Carr, A. McEwen, C. Pieters, M. Davies, R. Greeley, R. Greenberg, G. Neukum, C. Pilcher, J. Veverka, F. Fanale, A. Ingersoll, J. Pollack, P. Gierash, Mo
  1042

Evolution of Isotopic Signatures in Lunar-Regolith Nitrogen: Noble Gases and N in Ilmenite Grain-Size Fractions from Regolith Breccia 79035
J. P. Benkert, J. F. Kerridge, J. S. Kim, Y. Kim, K. Marti, P. Signer, R. Wieler
  1043

Data on Meteorite Orbits and Orbital Evolution from Natural Thermoluminescence and Cosmic Ray Exposure Ages of Observed Falls
P. H. Benoit, D. W. G. Sears
  1044

Interstellar Grains Within Interstellar Grains
T. J. Bernatowicz, S. Amari, E. Zinner, R. S. Lewis
  1045

Survey-type Analyses of Projectile Residues on Select LDEF Surfaces and Craters
R. P. Bernhard, D. E. Brownlee, M. R. Laurance, W. L. Davidson, F. Hoerz
  1046

Search for Evidence of Al26 in Meteorites that are Planetary Differentiates
M. T. Bernius, I. D. Hutcheon, G. J. Wasserburg
  1047

Reflectance Spectra of Fe2+-Mg2+ Disordered Pyroxenes: Implications to Remote-sensed Spectra of Planetary Surfaces
J. R. Besancon, R. G. Burns, S. F. Pratt
  1048

Martian Fluidized Ejecta Blankets as Seen in the PHOBOS `88 Termoskan Data Set
B. H. Betts, B. C. Murray
  1049

Composite KRFM-ISM Spectrum of PHOBOS (0.315-3.1 μm)
J. P. Bibring, I. Langevin, V. I. Moroz, L. V. Ksanfomality, A. V. Grigoryev, I. V. Khatuntsev, Y. V. Nikolsky, A. V. Zharkov, M. Combes
  1050

A Cane for the Mars Rover
K. F. Bickert
  1051

Models for Coronae: Deformation Due to Mantle Upwelling
D. L. Bindschadler, D. M. Janes, G. Schubert, V. L. Sharpton, S. W. Squyres, E. R. Stofan
  1052

Spectroscopic Analyses of Fe and Water in Clays: A Martian Surface Weathering Study.
J. L. Bishop, C. M. Pieters, J. O. Edwards, L. M. Coyne, S. Chang
  1053

Eutectoid-like Phase Separation in H2O:CH3OH Ices: Microstructural Observations and Implications for the Physical Properties of Comets
D. F. Blake, L. J. Allamandola, G. Palmer
  1054

Infrared Imaging of Mars Between 2.4 microns and 5.0 microns
D. L. Blaney
  1055

Nd and SR Isotopic Study of Muong Nong and Splash-form Australasian Tektites
J. D. Blum, D. A. Papanastassiou, C. Koeberl, G. J. Wasserburg
  1056

39Ar-40Ar Dating of Three Enstatite Chondrites and the Shallowater Aubrite
D. D. Bogard, D. H. Garrison
  1057

39Ar-40Ar Age of an Apollo 15, KREEP-poor, Impact Melt Rock
D. D. Bogard, D. H. Garrison, M. M. Lindstrom
  1058

Mineralogy of the K/T Boundary in a Deep-Sea Core: DSDP 596
B. F. Bohor, W. J. Betterton
  1059

On the Atmosphere of 2060 Chiron
D. C. Boice, S. A. Stern, W. F. Huebner
  1060

Trace Element and Radiogenic Isotope Characteristics and Fission Track Dating of High-Silica and High-Ca Tektite Glasses from the Cretaceous-Tertiary, Boundary at Beloc, Haiti
P. Bonte, L. Turpin, H. Sigurdsson, J. Carpena, C. Jehanno
  1061

Phosphorous Compounds in Jovian Atmosphere
S. P. Borunov, V. A. Dorofeyeva
  1062

Second-Order Accurate Models of Solar Nebula Formation
A. P. Boss
  1063

Tidal Disruption of Small Bodies
A. P. Boss
  1064

Combined Infrared (IR) and Analytical Electron Microscope (AEM) Studies of Thin-Sectioned IDPs
J. P. Bradley, H. Humecki, M. S. Germani, H. Bales
  1065

Mineralogical and Chemical Studies of Matrix in the Adelaide Meteorite, a Unique Carbonaceous Chondrite with Affinities to ALH A77307 (CO3)
A. J. Brearley
  1066

Subsolidus Microstructures and Cooling History of Pyroxenes in the Zagami Shergottite
A. J. Brearley
  1067

The Effects of Cooling on Lava Dome Morphology
N. T. Bridges, J. H. Fink, R. Griffiths
  1068

The Bidirectional Reflectance Spectra of Five Gas-rich Ordinary Chondrites
D. T. Britt, C. M. Pieters
  1069

Darkening in Gas-rich Ordinary Chondrites: Spectral Modelling and Implications for Regoliths of Ordinary Chondrite Parent Bodies
D. T. Britt, C. M. Pieters
  1070

U-Th-Pb Systematics of Vaca Muerta Mesosiderite
M. Brouxel, M. Tatsumoto
  1071

Serpentine and Modal Compositions of CM Chondrites
L. B. Browning, M. E. Zolensky, R. Barrett
  1072

Cosmic Spherules and Giant Micrometeorites as Samples of Main Belt Asteroids
D. E. Brownlee, S. Love, L. S. Schramm
  1073

Eucrite and Diogenite Clasts in Three Antarctic Achondri2tes
P. C. Buchanan, A. M. Reid
  1074

Morphological Characteristics of Small Monogenetic Volcanoes in Southern Guinevere Planitia: Implications for Eruption Conditions
M. H. Bulmer, J. E. Guest, C. R. Wiles
  1075

Middle-Urals Ring Structure, USSR: Definition, Description, Possible Planetary Analogues
G. A. Burba
  1076

Principal Component Analysis of Asteroid Spectra Using ECAs and 52-Color Data
T. H. Burbine, J. F. Bell
  1077

Does Lafayette = Nakhla? Not Necessarily So, Based on 4.2K Mossbauer Spectra of All of the SNC Meteorites
R. G. Burns
  1078

Types and Occurrence of Volcanic Features and Their Relations to Tectonics of Freyja and Danu Montes
J. D. Burt, J. W. Head
  1079

The Reflection Spectrum of the Lidia 110 Asteroid and its Comparison with the Spectral Characteristics of the Moon
V. V. Busarev
  1080

Spectrophotometric Data on the Vicinity of Mare Orientale
V. V. Busarev, V. V. Shevchenko
  1081

Mars: Relation Between Impact Seismicity and Runoff Formation by Fluidization of Permafrost
N. A. Cabrol, E. A. Grin
  1082

Mg/Al Isotopic Study of a Deformed and Recrystallized Loville Type B Refractory Inclusion: Hot Accretion into a Cold Matrix, and If So when?
C. Caillet, E. Zinner, G. J. MacPherson
  1083

Spectral Evidence for Carbonates on Mars: Hydrous Carbonates
W. M. Calvin, T. V. V. King
  1084

New Spectral Observations of Callisto and Ledinng/Trailing Hemisphere Distinctions
W. M. Calvin, R. N. Clark, T. V. V. King
  1085

Heating During Asteroidal Collisions. II
A. G. W. Cameron, W. Benz, J. T. Wasson
  1086

Comparison of 1988 Arecibo Radar Images of Western Eistla Regio, Venus, and Multi Polarization Airborne Radar Images of Terrestrial Terrains
B. A. Campbell, D. B. Campbell
  1087

Magellan Emissivity Measurements and Their Relationship to Geologic Features on the Surface of Venus
D. B. Campbell, N. J. S. Stacy, P. G. Ford, G. H. Pettengill, R. E. Arvidson, J. J. Plant
  1088

Crystal/Melt Partitioning of Ru, Rh and Pd for Silicate and Oxide Basaltic Liquidus Phases
C. J. Capobianco, M. J. Drake, P. S. Z. Rogers
  1089

Water on Mars
M. H. Carr, H. Waenke
  1090

Robotic and Human Exploration of Mars
M. H. Carr
  1091

Geochemistry and Origin of Metal in Aubrites
I. Casanova, K. Keil, H. E. Newsom
  1092

Distribution of Volatiles in the Elysium Region, Mars
J. A. Cave
  1093

Wet Debris Flow Deposits Near Elysium Mons: Evidence from Crater Morphology
J. A. Cave
  1094

Solar Proton Events During the Rising Phase of Solar Cycle 22
T. E. Clayton, R. D. Belian, R. C. Reedy, G. D. Reeves, T. A. Fritz, R. A. Christensen
  1095

First Millimeter Observations of Comet Austin 1989ci
S. Chakaveh, W. Dent
  1096

Experimental Determination of the Free Energy of Formation of MgAl2O4 Spinel: an Important Constraint on Solar System Processes
L. Chamberlin, J. R. Beckett, E. M. Stolper
  1097

Channeling Episodes of Kasei Valles, Mars, and the Nature of Rigid Plains Material
M. G. Chapman, K. L. Tanaka
  1098

The Pd-Ag Systematics in Chondrites and Mesosiderites
J. H. Chen, G. J. Wasserburg
  1099

Copernicus: Comparison and Complementarity Between Telescopic Multispectral Solid State Imaging and Reflectance Spectra
S. D. Chevrel, P. Pinet, O. Lesbre
  1100

MARSNET: an ESA Contribution to the Exploration of Mars
A. F. Chicarro
  1101

Multi-Spectral Thermal Infrared Observations of Mars: Implications for Compositional Variations
P. R. Christensen
  1102

Impact Melting in the Mercurian Regolith: Implications for Remote-sensing Observations
M. J. Cintala
  1103

A Reasessment of Impact Melting and Vaporization in the Regolith of Mercury: Comparison with the Moon
M. J. Cintala
  1104

Vaporization During Impacts into Planetary Regoliths: Application to the Moon and Mercury
M. J. Cintala
  1105

Differential Sealing of Cratering Phenomena: Consequences for Crater Morphology
M. J. Cintala, R. A. F. Grieve
  1106

Impact Melting and Peak-Ring Basins: Interplanetary Considerations
M. J. Cintala, R. A. F. Grieve
  1107

Modeled and Observed Impact-Melt Volumes: Potential Implications for Scaling Relationships
M. J. Cintala, R. A. F. Grieve
  1108

Distinctive Characteristics of the Aristarchus Plateau
P. E. Clark, A. Basu
  1109

Silicon and Titanium Isotopes in SiC from AGB Stars
D. D. Clayton, M. Obradovic, S. Guha, L. E. Brown
  1110

An Estimate of the Global Thickness of Impact Melt on Mars
S. M. Clifford, M. J. Cintala, N. G. Barlow
  1111

Availability of Metal Oxides in the Lunar Regoith for Resources Utilization
K. J. Cole
  1112

Can the Cassini Payload Conduct Pluto Flyby Science?
K. J. Cole
  1113

Magnetism of the Moon and Meteorites: Is it Associated with Cratering and Collisional Processes?
D. W. Collinson
  1114

Major Element Trends in Apollo 15 Green Glass B
R. O. Colson, A. M. Steele
  1115

The Experimental Production of Chondrule Rims: Constraints on Chondrule Rim Origins
H. C. Connolly Jr., R. H. Hewins
  1116

Low-Ni "Cosmic" Particles in the Stratospheric Dust Collection: an Examination of the JSC Catalog EDX Spectra
E. Cooke, G. J. Flynn, S. R. Sutton
  1117

New Discoveries of Pyroclastic Deposits on the Western Limb of the Moon
C. R. Coombs, B. R. Hawke
  1118

On Hawaiian and Lunar Lava Tubes
C. R. Coombs, B. R. Hawke
  1119

A New Look at Old Data: The Apollo 17 Lunar Sounder Experiment
B. L. Cooper, V. L. Sharpton, C. A. Sapp
  1120

G-Mode Classification of Martian Infrared Spectral Data from ISM-Phobos 2
A. Coradini, P. Cerroni, O. Forni, J. P. Biding, I. Gavrishin
  1121

Ground-Ice Detection and Potential Landing Sites for the Mars 94 Mission
F. M. Costard
  1122

Geologic and Tectonic History of Northern Lunae Planum, Mars
R. A. Craddock, T. A. Maxwell
  1123

Volatile History of Mangala Valles, Mars
R. A. Craddock, J. R. Zimbelman, R. Greeley, R. O. Kuzmin
  1124

An Overview of the Space Exploration Initiative
M. Craig
  1125

The Spatial Distribution and Time Evolution of Impact-generated Magnetic Fields
D. A. Crawford, P. H. Schultz
  1126

Isotopic Analysis of Osmium, Rhenium and Iridium by Negative Thermal Ion Mass Spectrometry
R. A. Creaser, J. H. Chen, D. A. Papanastassiou, G. J. Wasserburg
  1127

Thermal Processes in Lava Flows
J. Crisp, S. M. Baloga
  1128

The Scaling of Secondary Craters
S. K. Croft
  1129

Physical Properties of Lava Flows on the Southwest Flank of Tyrrhena Patera, Mars
D. A. Crown, T. K. Porter, R. Greeley
  1130

Composition of the Surface of Phobos: Results from the PHOBOS Mission
D. P. Cruikshank, M. J. Bartholomew, T. L. Roush
  1131

Identification of Solid C-N Bearing Organics on Outer Solar System Bodies
D. P. Cruikshank, W. K. Hartmann, D. J. Tholen, L. J. Allamandola, R. H. Brown, C. N. Mathews
  1132

Protocontinent Accretion from Plume Plateaus on Venus and on Early Earth
L. S. Crumpler, J. W. Head
  1133

Calderas on Mars: Models of Formation for the Arsia-type
L. S. Crumpler, J. C. Aubele, J. W. Head
  1134

NMR Spectroscopy of Experimentally Shocked Silicate Minerals
R. T. Cygan, M. B. Boslough, R. J. Kirkpatrick
  1135

40Ar/39Ar Laser Step Heating Ages of Some Apollo 15 Impact Melt Rocks
G. B. Dalrymple, G. Ryder
  1136

Petrogenesis of A14 Aluminous Mare Basalts: Results from 14072,48
E. J. Dasch, C.-Y. Shih, H. Wiesmann, B. M. Bansal, L. E. Nyquist
  1137

Galileo Views of the South Polar Region of the Moon
M. E. Davies, M. J. S. Belton, C. R. Chapman, J. Head III, K. Klaasen, B. Packowski, J. Yoshimizu
  1138

Preliminary Magellan Results: The Venus Spin Vector and Control Network
M. E. Davies, T. R. Colvin, P. G. Rogers
  1139

Large Mass Fractionation of Iron Isotopes in Cosmic Spherules Collected from Deep-Sea Sediments
A. M. Davis, R. N. Clayton, T. K. Mayeda, D. E. Brownlee
  1140

On the Size Distribution of the S-type Asteriods
D. R. Davis, C. R. Chapman
  1141

Interactions of Tectonic, Igneous, and Hydraulic Processes in the North Thrasis Region of Mars
P. A. Davis, K. L. Tanaka, M. P. Golombek, J. Plescia
  1142

Geology of Alpha Regio, Venus from Magellan Data
A. V. Decharon, D. L. Bindschadler, K. K. Beratan, J. W. Head
  1143

Orbital (ISM) and Telescopic Near-Infrared Observations of the Surface of Mars: Comparison and Implications
M. Degrenier, P. Pinet, S. Chevrel
  1144

Dynamic Crystallization Experiments and Cathodoluminescence Studies of Type I Chondrule Compositions
J. M. Dehart, G. E. Lofgren
  1145

Classification of Martian Lacustrine Basins
R. A. de Hon
  1146

Polygenetic Origin of Hrad Vallis, Mars
R. A. de Hon
  1147

K/T Age for the Popigai Impact Event?
A. L. Deino, J. B. Garvin, S. Montanari
  1148

Fe-Mn-Mg in Plagioclase from Lunar Basalt and Highland Samples
J. S. Delaney, S. R. Sutton
  1149

Petrography of Samples for Consortium Studies of the Elephant Moraine 87521 Very-Low Titanium Lunar Breccia
J. S. Delaney, P. H. Warren, G. W. Kallemeyn, R. L. Hervig
  1150

Major-Element Compositions of Glasses in Apollo 16 Core 64001: Constraints on the Mare Component
J. W. Delano
  1151

"Pyroxenite Xenolith" in Mare Basalt 10050: Evidence of Thermal Erosion by Mare Volcanics?
J. W. Delano
  1152

Trace Abundances of Phosphorus (P) in Pristine Lunar Glasses
J. W. Delano
  1153

Geochemistry of Apollo 17 Impact Glasses: Regolith Compositions
J. W. Delano, Y.-G. Liu, R. A. Schmitt
  1154

Lunar Volcanic Glasses: Trace Element Abundances in Individual Spheres Using Synchrotron X-ray Flourescence
J. W. Delano, S. R. Sutton, J. V. Smith
  1155

Detection of Micron-sized Particles in Meteor Streams Crossing the Trajectories of the Vega-I and Vega-2 Spacecraft
G. Denolfo, J. A. Simpson, A. J. Tuzzolino, L. V. Ksanfomality, R. Z. Sagdeev
  1156

Search for High Molecular Weight Polycyclic Aromatic Hydrocarbons and Fullerenes in Carbonaceous Meteorites
M. S. de Vries, H. R. Wendt, H. Hunziker, E. Peterson, S. Chang
  1157

Stratigraphy of the Beloc, Haiti, Cretaceous-Tertiary Boundary Sequence
S. D'Hondt, T. J. Bralower, M. van Fossen, J. E. T. Channell, C. Zachos, M. A. Arthur, H. Sigurdsson
  1158

On the Magmatic Origin of Oldhamite in Aubrites
T. L. Dickinson, G. A. McKay, G. E. Lofgren
  1159

Sensing the Soil Physics at the Surface of Mars
A. Dollfus, M. Deschamps, J. Zimbelman
  1160

Analysis of Callisto's Phase Curve as Derived from Telescopic Observations and Voyager Images
D. D. Domingue, G. W. Lockwood, D. T. Thompson
  1161

The Lunar Meteorite Elephant Moraine 87521: A Mixture of Low TI Mare Basalt and Highland Material?
G. Dreibus, H. Palme, B. Spettel, H. Waenke
  1162

The Figure of Phobos: an Update from the PHOBOS Mission
T. Duxbury, M. Wang, H. Herkenhoff
  1163

Spinel Troctolite from Apollo 17 Breccia 73215: Evidence for Petrogenesis as Deep-seated Lunar Crust
J. O. Eckert Jr., L. A. Taylor, C. R. Neal
  1164

Anorthosites with Negative EU Anomalies in Apollo 17 Breccias: Further Evidence for "REEP" Metasomatism.
J. O. Eckert Jr., L. A. Taylor, C. R. Neal, A. D. Patchen
  1165

Cumulate Lithologies and Melt Rocks from Apollo 17 Breccias: Correlation of Whole-Rock and Mineral Chemistry
J. O. Eckert Jr., L. A. Taylor, C. R. Neal, R. A. Schmitt, Y. G. Liu, A. D. Patchen
  1166

Sand on Mars: The properties of Dark Intracrater Deposits
K. S. Edgett, P. R. Christensen
  1167

Sand on Mars: Recent Volcaniclastic Sand Dunes on Earth as Compositional Analogs to the Wind-blown Sands of Mars
K. S. Edgett, N. Lancaster, P. R. Christensen
  1168

Possible Physical Causes of Reflectance Contrasts on PHOBOS
N. D. Efford
  1169

Theoretical Aspects of Photocinometric Terrain Profiling on PHOBOS and Other Bodies
N. D. Efford, L. Wilson
  1170

The Multistage Formation History of Fremdling AL-OAI: A TEM/EMPA Study of a Complex Opaque Assemblage
D. D. Eisenhour, P. R. Buseck
  1171

Allende TE: Evidence for Multiple Isotopic Fractionation Events Before and After Oxidation and Alteration
A. El Goresy, E. Zinner, C. Caillet, A. Virag, S. Weinbruch
  1172

Does Charon have an Atmosphere?
J. L. Elliot, L. A. Young
  1173

Kinetic Constraints on the Size of Nitrogen Grains on Triton
J. Eluszkiewicz
  1174

Araguainha Impact Structure, Brazil: Shocked Rocks of the Central Uplift
W. V. Engelhardt, S. Mathai, J. Walzebuck
  1175

Thermal Evolution and Physical Differentiation of Short Period Comets
S. Espinasse, A. Coradini, C. Federico, F. Capaccioni
  1176

Regolith History of Lunar Meteorites EET87521 and Yamato-793274
O. Eugster, Th. Michel, S. Niedermann
  1177

European Activities in Meteorite and Cosmic Dust Collection on Antarctica
Euromet
  1178

Mossbauer Backscatter Spectrometer for Mineralogical Analysis of the Mars Surface for Mars-94 Mission
E. N. Evlanov, L. M. Mukhin, F. Prilutskio, G. V. Smirnov, J. Juchniewicz, E. Kunkeleit, D. Klingefelter, J. M. Kudsen, C. D'Uston
  1179

The Collisional Lifetime of 951 Gaspra
P. Fairnella, D. R. Davis, A. Cellino, V. Zappala
  1180

Oxidation of Basaltic Tephras: Influence on Reflectance in the 1 micron Region
W. H. Farrand, R. B. Singer
  1181

The Stability of Calcium Aluminate Minerals in the Solar Nebula
B. Fegley Jr.
  1182

REE Abundance Patterns in CAIs: Implications for Nebular Processes
B. Fegley Jr., T. R. Ireland
  1183

Sensitivity of Helium-3 Counters for Determination of the Lunar Hydrogen Content
W. C. Feldman, R. C. Reedy
  1184

The Albedo Map of 4 Vesta as Derived from UV to Near-IR Reflectance Spectra
M. C. Festou, S. A. Stern, G. P. Tozzi
  1185

Comparative Morphostructural Analysis of the Terrestrial Planets
V. J. Finn, V. R. Baker, G. Komatsu
  1186

Morphostructural Analysis of Ishtar Terra, Venus
V. J. Finn, V. R. Baker, G. Komatesu
  1187

Textural Equilibrium in Anorthite Melt Systems: Preliminary Results
A. B. Finnila, M. J. Rutherford, P. C. Hess
  1188

The Perplexing Continuum Slope of Mars: Effects of Thin Ferric Coatings and Viewing Geometry
E. M. Fischer, C. M. Pieters, S. F. Pratt
  1189

Ni-and V-rich Metallic Particle in CAI of the Efremovka CV Chondrite
A. V. Fisenko, K. I. Ignatenko, A. K. Lavrukhina
  1190

On the Possibility of Formation of the Chondrite Diamonds in the Non-Equilibrium Process
A. V. Fisenko, L. F. Semjonova, V. F. Tatsy, G. V. Baryshnikova, A. K. Lavrukhina
  1191

Heterogeneous Distributions of the KR and AR Relative to Xe in Efremovka CV3 Chondrite Diamonds
A. V. Fisenko, A. B. Verchovsky, L. F. Semjonova, Y. A. Shukolykov
  1192

Pre-Terrestrial Oxidation Products of Iron Minerals in Carbonaceous Meteorites Identified in Mossbauer Spectra
D. S. Fisher, R. G. Burns
  1193

Lunar Ferroan Anorthosites: Rare Earth Element Measurements of Individual Plagioclase and Pyroxene Grains
C. Floss, O. B. James, J. J. McGee, G. Crozaz
  1194

Survival of Large Micrometeorites on Atmospheric Entry: Implications for Their Sources and the Flux of Cometary Dust
G. J. Flynn
  1195

Cosmic Class Stratospheric Particles: Trace Elements in C? Samples and Zn Depletions
G. J. Flynn, S. R. Sutton
  1196

Determination of Mass of Comet Halley Dust Particles
M. N. Fomenkova, E. N. Evlanov, L. M. Mukhin, O. F. Prilutsky
  1197

High Resolution Magellan Topography
P. G. Ford, F. Liu, G. H. Pettengill
  1198

Distributed Low Strain Regimes of the Terrestrial Planets
R. D. Forsythe, R. A. Schultz, T. R. Watters
  1199

Comparison of Data Sets (Topography, Geology, Geophysics, Cratering) for Mars' Western Equatorial Transition Zone
R. D. Forsythe, J. R. Zimbelman, N. G. Barlow
  1200

Spectral Studies of the Lunar Flamsteed Region: Compositional Implications
G. Frank, R. Jaumann, G. Neukum, H. Hoffman, H. Rebhan
  1201

Ridge Belts in Lavinia Planitia, Venus: Description and Sequence of Events
S. L. Frank, S. W. Squyres
  1202

Trapped Lunar Volcanic Gases Within Apollo 15 Glass Spherules
J. R. Fredericks, E. K. Gibson Jr., C. P. Hartmetz
  1203

Charge Distribution Analysis: Studying Defects in Minerals Under Minimum Perturbation Conditions
F. Freund, F. Batllo, M. M. Freund
  1204

O in Olivine: Cause for a Pronounced Electric Anomaly Around 600 deg C
F. Freund, F. Batllo, R. C. Leroy
  1205

Martian Crustal Dichotomy: Interplay Between Exogenic Origin and Later Endogenic Evolution
H. Frey
  1206

Geologic and Topographic Constraints on the Origin and Development of the Martian Crustal Dichotomy: What They Do and Don't Require
H. Frey, R. A. Schultz
  1207

A Search for Large Impact Basins in the Southern Hemisphere of Mars
H. Frey, A. M. Reidy, H. Wolfe, R. A. Schultz
  1208

A Large Pre-Hellas Impact Basin in the Southern Hemisphere of Mars
H. Frey, R. A. Schultz, A.-M. Reidy, H. Wolfe
  1209

Styles of Asteroidal Igneous Processes: Observational Constraints from Rotational Spectral Investigations
M. J. Gaffey
  1210

Cation Ordering in Orthopyroxene in Estherville Meteorite: Implications for Cooling Rate and Origin of Mesoiderite
J. Ganguly, H. Yang, S. Ghose
  1211

Sulfur Isotopic Analysis of the Orgueil Meteorite
X. Gao, M. H. Thiemens
  1212

Cosmogenic Noble Gases, 10Be and 26Al, in Cores of the Chico L6 Chondrite
D. H. Garrison, D. D. Bogard, A. Albrecht, G. F. Herzog, J. Klein, R. Middleton
  1213

Morphometry of Shield Volcanoes on Earth and Mars and Implications for Venus
J. B. Garvin, R. S. Williams Jr.
  1214

Maralinga--A New Metamorphosed Carbonaceous Chondrite
T. Geiger, B. Spettel
  1215

Track Investigation of the Andreevka L3 Chondrite
L. I. Genaeva, G. V. Baryshnikova, L. L. Kashkarov
  1216

Al/Ca Signature of Vaporization Processes
M. V. Gerasimov, Yu. P. Dikov, F. Wlotzka, L. M. Mukhin
  1217

Carbon-bearing Phases and Volatiles in Interplanetary Dust Particles
E. K. Gibson Jr., C. P. Hartmetz
  1218

Carbon Content of Silica Aerogel: A Material Proposed as a Medium for Collection of Cosmic Dust Grains
E. K. Gibson Jr., C. T. Pillinger
  1219

Geology of Young's Cave, Horse Lavatube System, Bend, Oregon: Implications for Lunar Base Siting
S. L. Gillett, L. A. Chitwood, C. York, T. Billings, B. Walden
  1220

A Search for the Presence of C60 as an Interstellar Grain in Meteorites
I. Gilmour, S. S. Russell, J. Newton, C. T. Pillinger, J. W. Arden, T. J. Dennis, J. P. Hare, H. W. Kroto, R. Taylor, D. R. M. Walton
  1221

Simultaneous 3.8 and 10 Micrometer Observations of the 91 Occupations of Io by Europa
J. D. Goguen, G. J. Veeder, D. L. Matson, T. V. Johnson, R. H. Brown, D. Toomey, W. M. Sinton
  1222

Mineralogy of Palagonitic Soils from Hawaii
D. C. Golden, R. S. Morris, D. W. Ming, R. K. Vempati, H. V. Lauer
  1223

Mars Seismicity Through Time from Surface Faulting
M. P. Golombek, K. L. Tanaka, W. B. Banerdt, D. Tralli
  1224

Modelled and Measured Strain in Mascon Basins on the Moon
M. P. Golombek, B. J. Franklin
  1225

Strain Accommodation Beneath Structures on Mars
M. P. Golombek, K. L. Tanaka, W. B. Banerdt
  1226

Thermal Analyzer for Planetary Soils (TAPS) Experiment: Functions and Design Options
J. L. Gooding
  1227

Water/Rock Interactions in Carbonaceous Chondrites: Possible Fingerprints for In-Situ Comet-Nucleus Analysis
J. L. Gooding, J. H. Allton
  1228

Origin of "White Druse" Salts in the EETA790001 Meteorite
J. L. Gooding, S. J. Wentworth
  1229

DSC Sensitivity to Hydrated Minerals in Planetary Samples
J. L. Gooding, A. J. Kettle, H. V. Lauer Jr.
  1230

Oxygen Isotopes and the Accretion of the Terrestrial Planets
C. A. Goodrich, M. J. Drake
  1231

PCA 82506: A Ureilite with LREE-enriched Component and a Whole Rock Sm-Nd Model Age of 4.55 GA
C. A. Goodrich, G. W. Lugmair
  1232

Ion-Probe Studies of Efremovka CAIs-1: Magnesium Isotopic Composition
J. N. Goswami, G. Srinivasan, A. A. Ulyanov
  1233

EET 87770: A Light Element Stable Isotope Study of a New Renazzo-like Carbonaceous Chondrite
M. M. Grady, R. D. Ash, C. T. Pillinger
  1234

The H5 Parent Collision 7 MA Ago
T. Graf, K. Marti
  1235

Phyllosilicates in the Yamato 82042 Carbonaceous Chondrite-Primitive or Not?
A. L. Graham, G. Kurat
  1236

On the Geologic Reality of Asteroid Families
J. C. Granahan, J. F. Bell
  1237

Features of the Volcanic Formation of Chondrites
L. B. Granovsky, N. G. Zinovyeva, O. B. Mitreikina
  1238

Characteristics of Ejecta and Alluvial Deposits at Meteor Crater, Arizona and Odessa Craters, Texas: Results from Ground Penetrating Radar
J. A. Grant, P. H. Schultz
  1239

Gradational Evolution of Young, Simple Impact Craters on the Earth
J. A. Grant, P. H. Schultz
  1240

The Gradational History of Southern Ismenius Lacus, Mars
J. A. Grant, P. H. Schultz
  1241

Styles of Crater Gradation in Southern Ismenius Lacus, Mars
J. A. Grant, P. H. Schultz
  1242

Magma Generation of Mars: Estimated Volumes Through Time
R. Greeley, B. Schneid
  1243

Lunar Maria and Related Deposits: Preliminary Galileo Imaging Results
R. Greeley, M. Belton, L. Bolef, M. Carr, C. Chapman, M. Davies, L. Doose, F. Fanale, L. Gaddis, R. Greenberg, J. Head, H. Hoffman, R. Jauman, T. Johnson, K. Klaasen, R. Koloord, A. McEwen, S. Murchie, G. Neukum
  1244

Differential Scaling of Crater Parameters: Implications for the Observed Terrestrial Record
R. A. F. Grieve, M. J. Cintala
  1245

The Sudbury Structure: an Emerging Perspective
R. A. F. Grieve, D. Stoeffler, A. Deutsch
  1246

Hot-Spot Tectonics of Eistla Regio, Venus: Results from Magellan Images and Pioneer Venus Gravity
R. E. Grimm, R. J. Phillips
  1247

Relationship of Volcanism and Fracture Patterns in a Volcano-Tectonic Structure West of Alpha Regio
E. B. Grosfils, J. W. Head
  1248

Primary Magnesian Eucrite Compositions: Estimates from the Compositions of Cumulate Diogenites
T. L. Grove, K. S. Bartels
  1249

Volcanic Plains and Small Edifices
J. E. Guest, J. W. Head, M. H. Bulmer, C. R. Wiles
  1250

Volcanic Geology and Stratigraphy at Part of the Boundary Region Between Lavinia Planitia and Lada Terra
T. B. Guest, M. G. Lancaster, K. Roberts, M. H. Bulmer
  1251

Channels on Venus: A Preliminary Morphological Assessment and Classification
V. C. Gulick, G. Komatsu, V. R. Baker, R. G. Strom, T. J. Parker
  1252

Numerical Modeling of Hydorthermal Systems on Martian Volcanoes: Preliminary Results
V. C. Gulick, M. S. Marley, V. R. Baker
  1253

On Downward Transport of Matter at Impact Crater Formation
E. P. Gurov
  1254

Mars Radar Mapping: Strong Depolarized Echoes from the Elysium/Amazonis Outflow Channel Complex
J. K. Harmon, M. P. Sulzer, P. Perillat
  1255

182Hf-182W: New Cosmochronometric Constraints on Terrestrial Accretion, Core Formation, the Astrophysical Site of the r-Process, and the Origin of the Solar System
C. L. Harper, J. Volkening, K. G. Heumann, C.-Y. Shih, H. Weismann
  1256

Interpretation of the 50Ti-96Zr Anomaly Correlation in CAI: NNSE Zr Production Limits and S/R/P Decomposition of the Bulk Solar System Zirconium Abundances
C. L. Harper, H. Wiesmann, L. E. Nyquist, D. Hartmann, B. Meyer, W. M. Howard
  1257

92Nb/93Nb and 92Nb/146Sm Ratios of the Early Solar System: Observations and Comparison of p-Process and Spallation Models
C. L. Harper, H. Wiesmann, L. E. Nyquist, W. M. Howard, B. Meyer, Y. Yokoyama, M. Rayet, M. Arnould, H. Palme, B. Spettel, K. P. Jochum
  1258

Simulated Experiments of SCR Bombardment of Titanium in Planetary Surfaces with 40 to 67.5 ME V Protons
L. J. Harris, P. A. J. Englert, C. A. Casteneda
  1259

Possible Misinterpretation of Lunar Cratering Record in Voyager Team Analyses of Outer Planet Satellites.
W. K. Hartmann
  1260

The Geology of the Manson Impact Structure: Sample Studies Reveal a Well Preserved Complex Impact Crater
J. B. Hartung, R. R. Anderson
  1261

New Observations of Nakhla, Governador Valadares and Lafayette, and Their Bearing on Petrogenesis
R. P. Harvey, H. Y. McSween Jr.
  1262

Evaporation Kinetics of Oxides of Rare Earth and Refractory Trace Elements, and the Chemical Fractionation of Hibonite by Evaporation
A. Hashimoto
  1263

Experimental Determination of Thermodynamic Properties of Ca-, Al- and Si-Hydroxide Gas Molecules and Application to the Solar Nebula
A. Hashimoto
  1264

Prediction of Activities of Oxide Components in the Multicomponent Liquid System FeO- MgO-CaO-Na2O-AIO1.5-SiO2
A. Hashimoto
  1265

Color Classification of the Martian Surface
E. Hauber, H. Hoffmann, M. Rauch, G. Neukum
  1266

Remote Sensing Studies of the Orientale Basin Region
B. R. Hawke, P. G. Lucey, G. J. Taylor, J. F. Bell, C. A. Peterson, D. Blewett, K. Horton, P. D. Spudis
  1267

Remote Sensing Studies of the Terrain Northwest of Humorum Basin
B. R. Hawke, C. A. Peterson, P. G. Lucey, G. J. Taylor, J. F. Bell, D. Blewett, B. Campbell, C. R. Coombs, P. D. Spudis
  1268

Venus Volcanic Centers and Their Environmental Settings: New Data from Magellan
J. W. Head, J. E. Guest, G. Schaber, K. Roberts, D. Senske, A. Basilevsky, R. Saunders, A. de Charon, T. Parker, B. Klose, B. Pavri, E. de Jong
  1269

Evidence from Magellan Data for Strike-Slip Faulting Within Freyja Montes Orogenic Belt
J. W. Head, L. S. Crumpler
  1270

Small Shield Volcaneos in Guinevere Planitia, Venus: Characteristics and Modes of Occurrence
J. W. Head, J. C. Aubele, E. N. Slyuta, D. B. Campbell
  1271

Orientale and South Pole-Aitken Basins:Preliminary Galileo Imaging Results
J. W. Head, M. Belton, M. Carr, C. Chapman, M. Davies, F. Fanale, E. Fischer, R. Greeley, R. Greenberg, R. Kolvoord, L. Doose, P. Helfenstein, H. Hoffmann, R. Jaumann, T. Johnson, K. Klaasen, A. McEwen, T. Becker
  1272

Venus Volcanism: Volcanic Associations and Environments from Magellan Data
J. W. Head, D. B. Campbell, C. Elachi, J. E. Guest, D. P. McKenzie, R. S. Saunders, G. G. Schaber, G. Schubert
  1273

The Geology of Western Eistla Regio, Venus: Analysis of Magellan Radar Data
J. W. Head, D. A. Senske, G. G. Schaber
  1274

Sky Distributions of Oort Cloud Comets During and Outside of Showers
J. Heisler, S. Tremaine, P. Weissman, R. Greenberg
  1275

Geologic Map of the MTM-85080 Quadrangle, Mars
K. E. Herkenhoff, B. C. Murray
  1276

Initiation of Subduction on Earth and Venus by Episodic Large-scale Mantle Overturn
D. L. Herrick, E. M. Parmentier
  1277

Breakup of Meteoroids in the Venusian Atmosphere and its Effects on Crater Formation
R. R. Herrick, R. J. Phillips
  1278

Oxygen Isotopic Microanalysis of Minerals in Thin Section Using the Ion Microprobe
R. L. Hervig, P. Williams, R. Thomas, I. M. Steele
  1279

Multi-Stage Exposure History of the Torino, H6, Meteorite
G. F. Herzog, S. Vogt, D. Aylmer, P. Signer, Th. Graf, R. Wieler, C. Tuniz, J. Klein, D. Fink, R. Middleton, A. J. T. Jull
  1280

Melt Connectivity, Decompaction and Polybaric Melting
P. C. Hess, M. J. Rutherford, A. B. Finnila
  1281

Condensation and Mineral Assemblages of Chondrule Precursors
R. H. Hewins
  1282

The Geochemistry of Buckminsterfullerene (C60) I: Solid Solutions with Sulfur and Oxidation with Perchloric Acid
D. Heymann
  1283

Raman Spectrocopic Study of Thermally Annealed Diaplectic Andesine Glass
D. Heymann
  1284

Accretion and Core Formation in the Earth
V. J. Hillgren, C. J. Capobianco, M. J. Drake
  1285

Ion Probe Analysis of Zircon and Yttrobetafite in a Lunar Granite
R. W. Hinton, C. Meyer
  1286

Effects of Grain Size and Shape in Modeling Reflectance Spectra of Mineral Mixtures
T. Hiroi, C. M. Pieters
  1287

Ni- and Fe-Powders: Grain Size Effects and Compositional Influence on the Spectral Reflectance
H. Hoffmann, M. Berger, G. Neukum
  1288

The Magnesium Sulfate-Water System at Pressures to 4 Kilobars
D. L. Hogenboom, J. S. Kargel, J. P. Ganasan, J. S. Lewis
  1289

Possible Pyroclastic Glasses Associated with Apollo 15 KREEP Basalt Fragments
B. B. Holmberg, A. Basu
  1290

Energy Coupling in Catastrophic Collisions
K. A. Holsapple, K. Y. Choe
  1291

A Solar Component in the Earth: Neon Isotope Anomalies in Loihi and Kilauea Basalts, Hawaii
M. Honda, I. McDougall, D. B. Patterson, A. Doulgeris, D. A. Clague
  1292

Measurement of the Lunar Regolith Thermal Conductivity in the Lunar-A Mission
K. Horai, A. Fujimura, S. Tanaka, H. Mizutani
  1293

Penetration Phenomena in Teflon and Aluminum Films Using 50-3200 micron Glass Projectiles
F. Hoerz, S. Messenger, R. Bernhard, T. H. See, G. Haynes
  1294

Scaling of Fragmentation Experiments Conducted at Elevated Pressure
K. R. Housen, R. M. Schmidt, K. A. Holsapple, D. R. Davis
  1295

Solar Rb/Sr: Is It Non-Chondritic?
M. Humayun, The Clayton Coffee Group
  1296

An Analytical Technique for the Isotopic Analysis of Potassium in Meteoritic and Planetary Materials
M. Humayun, R. N. Clayton, A. M. Davis
  1297

Evidences of Mixing Processes on Mars by Studying ISM Data
S. Hurtrez, C. Sotin, S. Erard, J.-P. Bibring, J. Mustard, C. Pieters
  1298

Noble Gas Characteristics of Interstellar Diamonds as a Function of Meteorite Class and Thermal History
G. R. Huss, R. S. Lewis
  1299

Astronomical Mechanisms and Geologic Evidence for Multiple Impacts on Earth
P. Hut, E. M. Shoemaker, W. Alvarez, A. Montanari
  1300

CR Isotopic Composition of Differentiated Meteorites: A Search for 53Mn
I. D. Hutcheon, E. Olsen
  1301

Possible Migration of the Giant Planets' Embryos
S. I. Ipatov
  1302

The Abundances of 182Hf in the Early Solar System
T. R. Ireland
  1303

REE Abundance Patterns in CAIs: A New Classification
T. R. Ireland, B. Fegley Jr.
  1304

TI Isotopic Compositions of Murchison SiC
T. R. Ireland, E. Zinner, S. Amari
  1305

The Kaidun Meteorite: Composition and Origin of the Large Metal Chondrule
A. V. Ivanov, V. I. Grokhovsky, N. N. Kononkova
  1306

Hydrodynamic Model of Central Mound Formation at Meteorite Craters
B. A. Ivanov
  1307

Mechanical Consequences of Impact Formed Crater Stickney on PHOBOS
B. A. Ivanov
  1308

Impact Cratering on Venus: Physical and Mechanical Models
B. A. Ivanov, I. V. Nemchinov, V. A. Provalov, V. V. Svetsov, V. M. Khasins
  1309

Enigmatic Circular Features in the Cantaloupe Terrain on Triton
M. A. Ivanov, V. K. Borozdin
  1310

K-T Boundary Tektites from Near Beloc, Haiti
G. A. Izett
  1311

40Ar/39Ar Age (66-64Ma) of K-T Boundary Tektites
G. A. Izett, G. B. Dalrymple, L. W. Snee, M. S. Pringle
  1312

Dust Particles from Comets and Asteroids: Parent-Daughter Relationships
A. A. Jackson, H. A. Zook
  1313

Phobos: Curious Alternatives of Origin Reconsidered
P. Jakes
  1314

Tektites, Experimental Equivalents and Properties of Superheated(Impact) Melts
P. Jakes, S. Sen, K. Matsuishi
  1315

Apollo 16 Dimict Breccias: I. Sample 64425
O. B. James, M. M. Lindstrom
  1316

Apollo 16 Dimict Breccias: II. Sample 65035
O. B. James, M. M. Lindstrom
  1317

Hubble Space Telescope Observations of Mars
P. B. James, R. T. Clancy, S. W. Lee, R. Singer, L. Martin, R. Kahn, R. Zurek
  1318

The K/T Boundary at Beloc, Haiti: Evidence for a Cosmic Event
C. Jehanno, D. Boclet, Ph. Bonte, L. Froget, B. Lambert, D. K. Larue, E. Robin, R. Rocchia
  1319

Carbonate Compositions in CM and CI Chondrites and Mg-Fe-Mn Partitioning During Aqueous Alteration
C. A. Johnson, M. Prinz
  1320

Residual Thermal Stress: A Mechanism for Joints in Venusian Lava Flows
C. L. Johnson, D. T. Sandwell
  1321

Spectral Ratio Methods for Telescopic Lunar TiO2 Mapping
J. R. Johnson, S. M. Larson, R. B. Singer
  1322

SO2 Weathering on Io
M. L. Johnson, D. S. Burnett, S. Epstein, A. Rice
  1323

Chronology of Glaciation in the Hellas Region of Mars
N. Johnson, J. S. Kargel, R. G. Strom, C. Knight
  1324

Compositional Variations of Particles from North Ray Crater Soil 67513 and Implications for the Composition of the Lunar Highlands
B. L. Jolliff
  1325

Experiments in Explosive Volcanism
A. M. Jones, J. R. Holloway, R. Greeley
  1326

Partial Melting of Carbonaceous Chondrites II: Constraints on the Origins of Basaltic Achondrites
J. H. Jones, D. W. Mittlefehldt, A. J. G. Jurewicz
  1327

Derivation of Isolated Olivine Grains in the Carbonaceous Chondrite ALH A77307 by Fragmentation of Chondrules
R. H. Jones
  1328

A Comparison of Zoning Profiles in FeO-rich PO Chondrule Olivines and Experimental Analogues: Evidence for Metamorphic Reheating of Chondrules
R. H. Jones, G. E. Lofgren
  1329

Comparative Planetology: Acheron Fossae-Scandia Colles, Mars: A Highly Degraded Pendant of the Tempe Terra Uplands with Respect to the Alba Patera System...and Alba Patera an Immature Venusian Corona?
H.-P. Jons
  1330

Carbon-14 Depth Profiles in Apollo 15 Cores
A. J. T. Jull, D. J. Donahue, R. C. Reedy
  1331

Terrestrial Ages and Petrologic Description of Roosevelt County Meteorites
A. J. T. Jull, F. Wlotzka, D. J. Donahue
  1332

Partial Melting of Carbonaceous Chondrites I: Allende(CV) and (Anhydrous) Murchison (CM)
A. J. G. Jurewicz, J. H. Jones, D. W. Mittlefehldt
  1333

A Preliminary Study of the potential for High Resolution Parametric Radar Imaging of Mars by Ground-based Radar
R. F. Jurgens, S. D. Howard, M. A. Slade, L. Robinett, D. Strobert
  1334

Normal Incidence Radar Observations of the "Stealth" South Tharsis Region
R. F. Jurgens, M. A. Slade, S. H. Zisk
  1335

The Karoonda (CK) Group of Carbonaceous Chondrites: A New Group Found Exclusively in Australia and Antarctica
G. W. Kallemeyn, A. E. Rubin, J. T. Wasson
  1336

Possibility of E/M (Low-Frequency) Sounding of the Cryolitozone of Mars
F. M. Kamenetskiy, V. M. Linkin, R. Ozorovich Yu
  1337

Some Peculiarities of the Irgizites Construction and Composition
I. G. Kapustkina
  1338

Physical Properties of Cryovolcanic Brines: Applications to the Evolution of Ganymede
J. S. Kargel
  1339

Terrestrial Glacial Eskers: Analogs for Martian Sinuous Ridges
J. S. Kargel, R. G. Strom
  1340

Compositional Constraints on Outflow Channel-forming Lavas on Venus
J. S. Kargel, G. Komatsu, V. R. Baker, J. S. Lewis, R. G. Strom
  1341

Glacial Geology of the Hellas Region on Mars
J. S. Kargel, R. G. Strom, N. Johnson
  1342

Carbonates in Antarctic Ordinary Chondrites: Evidence for Terrestrial Origin
H. R. Karlsson, A. J. T. Jull, R. A. Socki, E. K. Gibson Jr.
  1343

Very Low Dose of the Preaccretion Irradiation for the Okhansk H4 Chondrite Matter
L. L. Kashkarov, G. V. Kalinina
  1344

Thermoluminescence of Chondrules from the Nikolskoe L4 and Okhansk H4 Ordinary Chondrites: Influence of the Shock Pressure on Thermoluminescence Parameters?
L. L. Kashkarov, A. I. Ivliev, V. G. Kashkarova, G. V. Baryshnikova
  1345

The Radiation History of Kaidun Meteorite on Data of Track and TL Studies of Ca-px Crystals
L. L. Kashkarov, N. N. Korotkova, V. G. Kashkarova, A. Ya. Skripnik
  1346

Ridge Systems Related to Martian Impact Craters
K. Kauhanen, J. Raitala
  1347

Styles of Deformation in Ishtar Terra and Their Implications
W. M. Kaula, D. L. Bindschadler, R. E. Grimm, S. E. Smrekar, K. M. Roberts
  1348

Thermal and Albedo Mapping of the North Polar Region of Mars
K. D. Keegan, J. E. Bachman, D. A. Paige
  1349

Analytical Electron Microscopy of Fine-Grained Glass Spheres in Apollo 16 Soil 61181
L. P. Keller, D. S. McKay
  1350

Matrix Mineralogy of the Bali CV3 Carbonaceous Chondrite
L. P. Keller, K. L. Thomas
  1351

Dissipation, Memory, and Reservoirs: The Ringlets of Saturn
C. E. Kenknight
  1352

Trace Element Distributions in Compact Type A Ca-Al-Inclusions (CAI) in Allende and Leoville: Evidence for Dissolution of RELICT Perovskite
A. K. Kennedy, I. D. Hutcheon, G. J. Wasserburg
  1353

Modelling the Evolution of N and 15N/14N in the Lunar Regolith
J. F. Kerridge, P. Bochsler, O. Eugster, J. Geiss
  1354

Mantle Viscocity and Flow Geometry: Implications for Surface Motions on Venus
W. S. Kiefer
  1355

Xenon Isotopic Abundances in the Solar Wind
J. S. Kim, K. Marti
  1356

Evidence for Ammonium-bearing Minerals on Ceres
T. V. V. King, R. N. Clark, W. M. Calvin, D. M. Sherman, G. A. Swayze, R. H. Brown
  1357

Deep Moonquakes on Ganymede?
S. H. Kirby, W. B. Durham
  1358

The Role of Nonuniform Internal Heating in Triton's Energy Budget
R. L. Kirk, R. H. Brown
  1359

Comet-like Grand-Parent Bodies for Shock Origin of Ordinary Chondrites
M. Kitamura, A. Tsuchiyama
  1360

Bulk Composition and Mineralogy of Micrometeorites from Greenland
W. Kloeck, W. Beckerling
  1361

Preliminary Experiments with Escarpment Degradation in Frozen Sediment: Morphology, Process, and Implications for Landforms on Mars
R. C. Kochel, M. Carr
  1362

Polygonal Multi-Ring Systems of Triton and Related Features of the Moon, Earth and Venus
G. G. Kochemasov
  1363

Geochemistry of Impact Glass from the Aouelloul Crater, Mauritania
C. Koeberl, P. Auer
  1364

Manson Impact Structure Rocks: Geochemistry of Impacites
C. Koeberl, J. B. Hartung
  1365

A Reexamination of Early Numerical Simulations of Planetary Accretion
R. A. Kolvoord
  1366

Stratigraphy of the Layered Terrain in Valles Marineris, Mars
G. Komatsu, R. G. Strom
  1367

Locations and Geological Settings of the Venusian Channels
G. Komatsu, V. C. Gulick, V. R. Baker, T. J. Parker
  1368

Fluidized Impact Ejecta and Associated Impact Melt Channels on Venus
G. Komatsu, J. S. Kargel, V. R. Baker, J. S. Lewis, R. G. Strom
  1369

Apollo 16 Impact Melt Breccias 1. Intrasample Compositional Variations and Their Causes
R. L. Korotev
  1370

Apollo 16 Impact Melt Breccias 2. The Dimict Breccia Melt
R. L. Korotev
  1371

Apollo 16 Impact Melt Breccias 3. How Many Melting Events?
R. L. Korotev
  1372

Compositional Trends in Apollo 17 Soils
R. L. Korotev
  1373

On the Compositional Differences Between the "Ancient" and "Young" Regolith at Apollo 16
R. L. Korotev
  1374

Europium Mass Balance in the Lunar Crust (Repeated)
R. L. Korotev, L. A. Haskin
  1375

The Petrology of an Andestic Melt Rock and a Polymict Breccia from the Interior of the Chicxulub Structure, Yucatan, Mexico
D. A. Kring, A. R. Hildebrand, W. V. Boynton
  1376

Stable Hydrogen and Carbon Isotope Ratios of Extractable Hydrocarbons in the Murchison Meteorite
R. V. Krishnamurthy, S. Epstein, S. Pizzarello, J. R. Cronin, G. U. Yuen
  1377

Chromite-rich Chondrules in the Ordinary Equilibrated Chondrites and Their Possible Formation
A. N. Krot, M. A. Ivanova, M. I. Petaev, Yu. I. Sidorov, N. N. Kononkova, N. N. Karataeva
  1378

Composition and Structure of Metal Particles in the Milnikovo (LL6) Chondrite
A. N. Krot, N. I. Zaslavskaya, N. N. Kononkova
  1379

The Melnikovo Chondrite (LL6)
A. N. Krot, N. I. Zaslavskaya, N. N. Kononkova, M. I. Petaev
  1380

The Sychevka IIIA Iron Meteorite
A. N. Krot, N. I. Zaslavskaya, M. I. Petaev, N. N. Kononkova, G. M. Kolesov, L. D. Barsukova
  1381

Non-Equilibrium in the Acuna IIIAB Iron
G. Kurat, F. Brandstaetter, H. Palme, B. Spettel
  1382

Are the Upper Greenstones at Belingwe (Zimbabwe) Allochthonous?
T. M. Kusky
  1383

Thermal Inertia Mapping of Mars on the Base of VD and IR-Imaging by Termoscan Instrument
R. O. Kuzmin, V. K. Borozdin, A. S. Selivanov, M. K. Naraeva, Yu. M. Gektin, V. D. Kharlamov, A. V. Romanov, D. A. Fomin, A. V. Dulytsky, A. M. Shirenev
  1384

Possible Sites of Explosive Volcanism in Southern Guinevere Planitia
M. G. Lancaster, J. E. Guest
  1385

Relative Chronology of Martian Volcanoes
R. Landheim, N. G. Barlow
  1386

Shock Experiments on Heated Single Crystal Beta-Quartz
F. Langenhorst, A. Deutsch, U. Hornemann
  1387

Shock Metamorphism of the Zagami Achondrite
F. Langenhorst, D. Stoeffler, D. Klein
  1388

ISM Observations of the Spectral Characteristics of PHOBOS in the Near Infrared
Y. Langevin, J.-P. Bibring, B. Gondet, D. Cruikshank
  1389

Mapping Lunar Soil Maturity Using Groundbased CCD Multispectral Imagery
S. M. Larson, J. R. Johnson, R. B. Singer
  1390

Analytical and Experimental Actinide Partitioning in Natural Basalts
T. Z. La Tourrette, D. S. Burnett
  1391

The Possible Process of the 146Nd Excess Formation in Some Fractions of the Efremovka Chondrite
A. K. Lavrukhina
  1392

On Origin of Ne-E in Chondrites
A. K. Lavrukhina, G. K. Ustinova
  1393

Isotopic Composition of Oxygen in the Elenovka L5 Chondrite Chondrules
A. K. Lavrukhina, V. I. Ustinov, G. V. Baryshnikova, Yu. A. Shukolyukov
  1394

Diameter, Rotation, and Thermal Properties of Asteroid 4 Vesta
L. A. Lebofsky, W. B. Hubbard, E. Asphaug, D. M. Hunten, R. L. Millis, O. G. Franz, L. H. Wasserman, M. A'Hearn, R. Schnurr, A. R. Klemola, W. Osborn, F. Vilas, A. E. Potter, P. D. Maley, P. L. Manly
  1395

Patterns of Mantle Convection on Venus
A. M. Leitch, D. A. Yuen
  1396

Does Europa's Surface Manifest Evidence of Polar Wander?
A. C. Leith, W. B. McKinnon
  1397

Subsurface Structures: Prospects for a Lunar Base
G. A. Lejkin, A. N. Sanovich, V. V. Shevchenko
  1398

A Finite Element Model of Crustal Deformation on Venus
A. Lenardic, W. M. Kaula, D. L. Bindschadler
  1399

Mapping the Stability Field of Jupiter Trojans
H. F. Levison, E. M. Shoemaker, R. F. Wolfe
  1400

The Effect of Sodium Vapor on the Sodium Content of Chondrules
R. D. Lewis, G. E. Lofgren
  1401

Finally, BA & SR Accompanying Xe-HL in Diamonds from Allende
R. S. Lewis, G. R. Huss, G. Lugmair
  1402

Processing of a Protostellar System by a Bipolar Outflow
K. Liffman, J. M. Stone
  1403

MAC88136--The First EL3 Chondrite
Y. T. Lin, H. _j. Nagel, L. L. Lundberg, A. El Goresy
  1404

Trace Element Analysis by INAA of Possible Martian Weathering Products in Shergottite EETA 79001
D. J. Lindstrom, R. R. Martinez
  1405

INAA of Large Interplanetary Dust Particles from Collector L2005
D. J. Lindstrom, M. E. Zolensky, R. R. Martinez
  1406

Evidence for Magmatic Differentiation in Matrix Lithologies of Basaltic Lunar Meteorite EET87521
M. M. Lindstrom, R. R. Martinez, M. E. Lipschutz
  1407

Ion Microprobe Analyses of REE in Minerals from Apollo 15 Quartz Monzodiorites
M. M. Lindstrom, U. B. Marvin, G. Crozaz
  1408

Trace Elements in Mineral Separates of the Pena Blanca Springs Aubrite
K. Lodders, H. Palme
  1409

An Experimental Study of Minor Element Partitioning in Olivine in Type 1A Chondrules
G. E. Lofgren, J. M. Dehart
  1410

Dynamic Crystallization Characteristics of ADOR: Compositional Variations
G. E. Lofgren, A. B. Lanier
  1411

The Origin of the Green Glass Magmas by Polybaric Partial Melting
J. Longhi
  1412

Implications of the Venera 13 Surface Analysis for the CO2 Content of the Interior of Venus
J. Longhi, V. Pan
  1413

Valles Marineris Tectonism: Questions and Suggestions
B. K. Lucchitta, M. G. Chapman, N. K. Isbell
  1414

Visible and Infrared Imaging of Copernicus Crater and Surroundings
P. G. Lucey, B. R. Hawke, K. Horton
  1415

CA and S Isotopic Compositions and REE Concentrations in Oldhamite of Five Unequilibrated Enstatite Chondrites
L. L. Lundberg, G. Crozaz, E. Zinner
  1416

What is the Cosmogenic Meaning of the Asteroid Diameter 100-125 km?
D. P. Lupishko, F. P. Velichko
  1417

Application of the Semivariogram Textural Classifier (STC) for Terrane Recognition Using Magellan Data: Preliminary Results
J. A. MacDonald, F. P. Miranda
  1418

MG Isotopic and Trace Element Compositions of Spinel-Pyroxene Inclusions in the Mighei C2 Meteorite
G. J. MacPherson, A. M. Davis
  1419

Influence of Solar Radiation on Temperature Conditions in the Solar Nebula
A. B. Makalkin, V. A. Dorofeyeva
  1420

Numerical Simulation of Retrograde Tidal Capture of a Triton-like Planetoid by a Neptune-like Planet
R. J. Malcuit, D. M. Mehringer, R. R. Winters
  1421

Hillslope Landforms on Venus: Preliminary Results from Magellan
M. C. Malin
  1422

Interpreting Venusian Lava Domes
M. C. Malin, J. H. Fink, R. Griffiths
  1423

The Potential Use of Meteor Burst Communication Systems on Non-Terrestrial Bodies
A. A. Mardon
  1424

Utilization of Geographic Information System in Lunar Mapping
A. A. Mardon
  1425

The Kinetic Model of Photochemistry and Dynamics of the Cometary Inner Coma
M. Ya. Marov, D. V. Bisikalo, V. I. Shematovich
  1426

Determination of Shock-Wave Peak Pressure and Rb-Sr Isotope Systematics in a Granite from the Araguainha Impact Crater (Brasil)
I. Martinez, U. Scharer, A. Deutsch
  1427

New Observations on Polygonized Lunar Dunites
U. B. Marvin, B. B. Holmberg, M. M. Lindstrom
  1428

Temporary Trapping of Dust Particles into Orbital Resonances with the Earth
F. Marzari, S. J. Weidenschilling, M. Fabris, V. Vanzani
  1429

Early Environmental Evolution of Venus
T. Matsui, E. Tajika
  1430

Oxygen Isotopic Studies of Carbonacceous Chondrite Belgica-7904
T. K. Mayeda, R. N. Clayton, Y. Ikeda
  1431

Zagami: Product of a Two-Stage Magmatic History
T. J. McCoy, G. J. Taylor, K. Keil, P. D. Noll Jr.
  1432

Space Debris: Orbital Microparticulates Impacting LDEF Experiments Favour a Natural Extraterrestrial Origin
J. A. M. McDonnell
  1433

Lunar Multispectral Mosaics from Galileo Imaging
A. C. McEwen, T. Becker, M. Belton, M. Carr, C. Chapman, M. Davies, F. Fanale, M. Robinson, S. Postawko, R. Greeley, R. Sullivan, J. Moersch, L. Gaddis, L. Bolef, R. Greenberg, S. Murchie, J. Sunshine, C. Pieters, E. Fischer, J. Plutchak, T. Johnson, K. Klaasen, H. Breneman, G. Neukum, H. Hoffman, R. Jaumann, C. Pilcher, J. Veverka, P. Helfenstein
  1434

Digital Cartography of Io
A. C. McEwen, B. Duck, K. Edwards
  1435

Magnesiowustite/Melt and Majorite/Melt Partitioning and the Early Thermal History of the Earth
E. A. McFarlane, M. J. Drake, C. Herzberg
  1436

Depositional and Structural Sequence Revealed by Mapping on Magellan Radar Images, Eistla Regio/Guinevere Planitia Area, Venus
G. E. McGill, E. R. Stofan, R. S. Saunders, P. G. Ford
  1437

Isle of Pines, Cuba: K/T Impact Evidence Not Yet Found
J. F. McHone, R. S. Dietz
  1438

Reduction of Simulated Lunar Glass by Carbon and Hydrogen and its Implications for Lunar Base Oxygen Production
D. S. McKay, R. V. Morris, A. J. Jurewicz
  1439

Constraints on the Origin of the Mare Basalt Europium Anomaly: REE Partition Coefficients for Pigeonite
G. McKay, L. Le, J. Wagstaff
  1440

Mineralogy of Ordinary Chondrites and Implications for Asteroid Spectrophometry
H. Y. McSween Jr., M. E. Bennett III, E. Jarosewich
  1441

High Spatial Resolution Mapping of Lunar Titanium Abundances Using Ground-based Multispectral CCD Images
D. E. Melendrez, S. M. Larson, J. R. Johnson, R. B. Singer, W. V. Schempp, P. Doherty
  1442

Projectile Fragmentation During Penetration of Thin Targets
S. Messenger, F. Hoerz
  1443

A Survey of Esker Morphometries, the Connection to New York State Glaciation and Criteria for Subglacial Melt-Water Channel Deposits on the Planet Mars
S. M. Metzger
  1444

Evidence for Aqueous Alteration Prior to Parent Body Formation; Petrographic Observations in CM-Chondrites
K. Metzler, A. Bischoff
  1445

Lunar Zircon
C. Meyer, C. Galindo, V. Yang
  1446

Al-rich Chondrules from the Preobrazhenka (H3-4) Chondrite
L. F. Migdisova, A. A. Yaroshevsky, N. N. Kononkova
  1447

Determination of PHOBOS Gravity Harmonics, Spin State, and Internal Properties
J. K. Miller, T. C. Duxbury
  1448

Geochemistry of 5 Antractic Howardites and Their Clasts
D. W. Mittlefehldt, M. M. Lindstrom
  1449

Shock Recovery Experiments on Mesosiderite Analogs
D. W. Mittlefehldt, M. Cintala, F. Hoerz
  1450

Formation Processes of Shocked Quartz by Impact Metamorphism
Y. Miura
  1451

New Mineralogical Indicators of Shock Metamorphism
Y. Miura
  1452

A Stress Indicator for Minerals by Micro-Raman Spectroscopy
M. Miyamoto, N. Fujii, K. Ito
  1453

Wavenumber Shifts in Raman Lines of Shocked Olivines
M. Miyamoto, H. Mori, T. Sekine
  1454

Analysis of Hawaiian Lava Surface Roughness with Thermal Infrared Images
S. R. K. Moncrief, S. K. Rowland
  1455

The Guarda Circular Structure: A Possible Complex Impact Crater
J. F. Monteiro
  1456

Preliminary Comparison of 3.5-cm and 12.6-cm Wavelength Continuous Wave Observations of Mars
H. J. Moore, T. C. O'Brien, R. F. Jurgens, M. A. Slade, T. W. Thompson
  1457

Rhenium and Osmium Abundances and Os-187/Os-186 Ratios in IIAB and IIIAB Iron Meteorites
J. W. Morgan, R. J. Walker, J. N. Grossman
  1458

Evaluation of Geophysical Properties of the Lunar Regolith for the Design of Precursor Scientific Missions for the Space Exploration Initiative
P. Morgan, W. W. Mendell
  1459

Reflectance Spectra of Some Fractions of Migei and Murchison CM Chondrites in the Range of 0.3-2.6 microns
L. V. Moroz, C. M. Pieters
  1460

Spectroscopy of Solid Carbonaceous Materials: Implications for Dark Surfaces of Outer Belt Asteroids
L. V. Moroz, C. M. Pieters, M. V. Akhmanova
  1461

Preparation and Characterization of a Nanophase Hematite Powder
R. V. Morris, H. V. Lauer Jr., D. G. Schulze, R. G. Burns
  1462

Aircraft Imaging Radar Data of Hawaii: A Potential Magellan Analog
P. J. Mouginis-Mark, B. A. Campbell
  1463

Parent Craters for the SNC Meteorites
P. J. Mouginis-Mark, T. J. McCoy, G. J. Taylor, K. Keil
  1464

Interpretation of the Northern Boundary of Ishtar Terra from Magellan Images and Altimetry
S. Mueller, R. E. Grimm, R. J. Phillips
  1465

The Bulk Composition of the Dust Component of Comet Halley
L. M. Mukhin, G. G. Dolnikov, E. N. Evalnaov, M. N. Fomenkova, O. F. Prilutsky
  1466

Two Populations of Comet Halley Dust Particles
L. M. Mukhin, E. N. Evlanov, M. N. Fomenkova, O. F. Prilutsky
  1467

K-T Boundary Signatures in the Manganese Nodule Zetes-3D
A. V. Murali, D. P. Blanchard, B. L. K. Somayajulu, P. P. Parekh
  1468

Integrated Geologic Map of the Equatorial Region of Mars
S. L. Murchie, N. R. Izenberg
  1469

Disk-resolved Spectral Reflectance Properties of PHOBOS from 0.3-3.2 microns: Preliminary Integrated Results from PHOBOS 2
S. L. Murchie, S. Erard, Y. Langevin, D. T. Britt, J. P. Bibring, J. F. Mustard, J. W. Head, C. M. Pieters
  1470

Spectral Properties of Interior Deposits of Valles Marineris from ISM Imaging Spectroscopy
S. L. Murchie, S. Erard, J. F. Mustard, J.-P. Bibring, Y. Langevin, J. W. Head, C. M. Pieters
  1471

Nitrogen, Noble Gases and Nuclear Tracks in Lunar Meteorites MAC88104/88105
S. V. S. Murty, J. N. Goswami
  1472

Spectral Modelling of the Unknown: an Example Using Talc and Actinolite
J. F. Mustard
  1473

Composition of Syrtis Major Volcanic Plateau
J. F. Mustard, S. Erard, J. P. Bibring, Y. Langevin, J. W. Head, C. M. Pieters
  1474

The Evolution of the Surface of 951 Gaspra: A Pre-Galileo Estimate
N. Namiki, R. P. Binzel
  1475

An Assessment of the Crustal Remelting Hypothesis for Volcanism in the Freyja Montes Deformation Zone
N. Namiki, S. C. Solomon
  1476

Infrared Reflectance Spectra (4-12 microns) of Lunar Samples
D. B. Nash
  1477

Reconstruction of Original Morphology of the Kara Impact Structure and its Relevance to the K/T Boundary Event
M. A. Nazarov, D. D. Badjukov, L. D. Barsukova, A. S. Alekseev
  1478

The Kara Impact Structure: Hydrogen Isotopic Composition in the Impact Melts and Constraints on the Impact Age
M. A. Nazarov, A. L. Devirts, E. P. Lagutina, A. S. Alekseev, D. D. Badjukov, Yu. A. Shukolyukov
  1479

A Re-Evaluation of Apollo 12 Mare Basalt Classification and Petrogenesis: Some Empirical Observations Using the Current Data Base
C. R. Neal
  1480

Hazards Involved in Lunar Petrogenetic Interpretation: A Summary of Criteria Used to Establish the Pristinity and Monomict Nature of Moon Rocks
C. R. Neal, L. A. Taylor
  1481

The Origin of Whitlockite: Implications for the Evolution of the Lunar Highlands
C. R. Neal, L. A. Taylor
  1482

Problems Inherent in the Study of Lunar Highland Samples: The "Typical Case" at Apollo 14
C. R. Neal, L. A. Taylor, M. M. Lindstorm
  1483

Earth-based Multispectral Observation of the Moon
G. Neukum, R. Jaumann, H. Hoffmann, J. Oberst, R. Wagner, P. Regner, H. Rebhan, H. Heisinger, A. Dummel
  1484

New Constraints on the Size of the Lunar Core and the Origin of the Moon
H. E. Newsom, S. K. Runcorn
  1485

Tieschitz Chondrules: I-Xe Systematics
R. H. Nichols Jr., B. E. Hagee, C. M. Hohenberg
  1486

Cosmic Ray Exposure History of Lunar Meteorite EET87521
K. Nishiizumi, J. R. Arnold, P. Sharma, P. W. Kubik, J. Klein, R. Middleton
  1487

Cosmogenic 36 CI Production on the Lunar Surface
K. Nishiizumi, J. R. Arnold, P. Sharma, P. W. Kubik, R. C. Reedy
  1488

Geochemistry of Anorthosite Clasts from 67016: Evolution of the Lunar Crust and the Composition of the Moon
M. D. Norman, S. R. Taylor
  1489

The SiH Stretch as an Indicator of the Oxidation State of Cometary/Asteroidal Regolith
J. A. Nuth, M. H. Moore, T. Tanabe
  1490

Thermal Resetting of Radiometric Ages. I: Experimental Investigation
L. E. Nyquist, D. D. Bogard, D. H. Garrison, B. M. Bansal, H. Wiesmann, C.-Y. Shih
  1491

Thermal Resetting of Radiometric Ages. II: Modeling and Applications
L. E. Nyquist, D. D. Bogard, D. H. Garrison, B. M. Bansal, H. Wiesmann, C.-Y. Shih
  1492

53Mn and 146Sm: Alive and Well in an Angrite Magma
C. L. Harper
  1493

Observations of Mars During the 1990 Opposition from the Goldstone Solar System Radar Facility at 3.53 CM Wavelength
T. C. O'Brien, R. F. Jurgens, M. A. Slade, S. D. Howard, H. J. Moore, T. W. Thompson
  1494

Magnetism of Lunar Soils
R. R. Oder
  1495

The Cyrillid Shower: Remnant of a Circumterrestrial Ring?
J. A. O'Keefe
  1496

Tsunamis from Giant Impacts on Solid Planets
J. D. O'Keefe, T. J. Ahrens
  1497

Watson: A New Link in the IIE Iron Chain
E. J. Olsen, J. Schwade, A. M. Davis, R. N. Clayton, T. K. Mayeda, R. S. Clarke Jr., E. Jarosewich, I. M. Steele
  1498

Are the Equatorial Highlands on Venus Produced by Mantle Diapirs?
P. Olson
  1499

An Attempt to Find Weak Lunar Absorption Bands in the Visible Range on the Base of Umov's Effect
N. V. Opanasenko, Yu. G. Shkuratov
  1500

On Correlation of Value of Minimum of Negative Polarization and Phase Dependence Slope of Lunar Brightness
N. V. Opanasenko, Yu. G. Shkuratov
  1501

Dependence of the Value of Minimum of Negative Polarization upon Albedo for the Moon and Laboratory Samples
N. V. Opanasenko, Yu. G. Shkuratov, N. S. Olifer, O. I. Kvaratskhelia
  1502

Oxygen Isotope Variation, Mossbauer Spectra or Iron Oxidation and Volatile Content of Tektite Glasses from the Cretaceous-Tertiary Boundary, Haiti
N. Oskarsson, M. Steinberg, Ph. Pradel, O. Helgason, H. Sigurdsson, S. D'Hond
  1503

Microwave Remote Sensing of Martian Surface Parameters and Global Distribution of Cryolitozone of Mars
Yu. R. Ozorovich, Yu. V. Raizer
  1504

Thermal and Albedo Mapping of the South Polar Region of Mars
D. A. Paige, K. D. Keegan
  1505

Trace Element Distribution in Minerals from a Silicate inclusion in the Caddo IAB-Iron Meteorite
H. Palme, I. D. Hutcheon, A. K. Kennedy, Y. J. Sheng, B. Spettel
  1506

The Role of CO2 in the Formation of the Nakhlites: Metasomatism in the Martian Mantle
V. Pan, J. R. Holloway, C. M. Bertka
  1507

Planetary Volcanic Processes: Vapor Phase Transport in Terrestrial and Lunar Pyroclastic Deposits
J. J. Papike, C. K. Shearer, M. N. Spilde
  1508

Tectonic Deformation on Icy Satellites: A Model of Compensating Horsts
R. Pappalardo, R. Greeley
  1509

Comparison of Experimental Studies on Chondrules and Ca-Al-rich Inclusions
J. M. Paque, G. Lofgren
  1510

The Shape of Dikes Emplaced Laterally Within Volcanic Edifices
E. A. Parfitt
  1511

A Comparison of the Martian Medusae Fossae Formation with Terrestrial Carbonate Platforms
T. J. Parker
  1512

Formation of Mangala Valles, Mars, Through Catastrophic Drainage of a Large Surgace Lake
T. J. Parker, D. S. Gorsline
  1513

Where is the Source for Uzboi Vallis, Mars?
T. J. Parker, D. S. Gorsline
  1514

An Outflow Channel in Lada Terr Venus
T. J. Parker, G. Komatsu, V. R. Baker, V. Gulick, R. Saunders, C. Weitz, J. Head
  1515

The Width of Fault Zones in a Brittle-Viscous Lithosphere: Strike-Slip Faults
E. M. Parmentier
  1516

Production of Cosmogenic Nuclides in Thick Targets by Alpha Bombardment
R. L. Paul, P. A. J. Englert, L. J. Harris, I. Goldman, C. Jackson, R. Larimer, K. T. Lesko, B. Napier, E. B. Norman, B. Sur
  1517

Steep-sided Domes on Venus: Characteristics and Implications for Composition and Eruption Conditions
B. Pavri, B. Klose, J. W. Head
  1518

Experimental Study of the Solubility of CO+CO2 in Basalt, with Applications to Early Atmosphere/Magma Ocean Equilibria
A. R. Pawley, J. R. Holloway
  1519

Accretionary Lapilli and Other Sedimentary Textures of the Howardite Kapoeta
A. Pedroni
  1520

Precompaction Irradiation of the Howarditic Regolith Breccia Kapoeta
A. Pedroni
  1521

Solar NE and AR in Kapoeta Plagioclase: SW- and SEP-Components Identical to Those in Minerals from the Lunar Regolith
A. Pedroni, H. Baur, P. Signer, R. Wieler
  1522

Interpretation of Geophysical Cross Sections on the North Flank of the Chicxulub Impact Structure
G. T. Penfield, A. Z. Camargo
  1523

Evidence for a Major Asteroid Impact on the Earth 2.14 Million Years Ago: Implication for Tertiary Extinctions and Origin of Tektite
H. Peng, Y. Cong, Z. Liu, Z. Zhuang, Z. Chai, X. Mao
  1524

The Identification of Tracks Due to Th-U Cosmic-ray Nuclei in Olivines from Pallasites
V. P. Perelygin, S. C. Stetsenko
  1525

Oldhamite as an Indicator of Disequilibrium During Enstatite Chondrite Accretion
M. I. Petaev
  1526

Meteorite Sterlitamak--A New Craterforming Fall
M. I. Petaev, Yu. L. Kisarev, Sh. A. Mustafin, R. K. Shakurov, A. V. Pavlov, B. A. Ivanov
  1527

Martian Seismicity
R. J. Phillips, R. E. Grimm
  1528

Venus Impact Craters: Implications for Atmospheric and Resurfacing Processes from Magellan Observations
R. J. Phillips, R. E. Arvidson, J. M. Boyce, D. B. Campbell, J. E. Guest, G. G. Schaber, L. A. Soderblom
  1529

Partition Coefficients for Fe, Mg, TI and K Between Plagioclase and Basalt: Implications for Anorthosites
W. C. Phinney
  1530

Crustal Heterogenity of the Moon viewed from the Galileo SSI Camera: Lunar Sample Calibrations and Compositional Implications
C. M. Pieters, M. Belton, T. Becker, M. Carr, C. Chapman, F. Fanale, E. Fischer, L. Gaddis, R. Greeley, R. Greenberg, H. Hoffmann, J. Head, P. Helfenstein, R. Jaumann, T.V. Johnson, K. Klassen, A. McEwen, S. Murchie, G. Neukum, J. Oberst, C. Pilcher, J. Plutchak, S. Pratt, M. Robinson, R. Sullivan, J. Sunshine, K. Veverka
  1531

Bidirectional Spectroscopy of Returned Lunar Soils: Detailed "Ground Truth" for Planetary Remote Sensors
C. M. Pieters, S. Pratt, H. Hoffman, P. Helfenstein, J. Mustard
  1532

Ground Probing Radar Survey of the Ejecta Blanket at Meteor Crater Arizona
J. Pilon, R. A. F. Grieve, V. L. Sharpton
  1533

Radar Properties in the Equatorial Plains of Venus--Influence of Impact, Volcanic and Tectonic Features
J. J. Plaut, R. E. Arvidson, E. R. Stofan, P. C. Fisher
  1534

Compressive Strain in Lunae Planum-Shortening Across Wrinkle Ridges
J. B. Plescia
  1535

Extension and Strain in Northern Tharsis
J. B. Plescia
  1536

Gravity Survey of the Mt. Toondina Impact Structure, South Australia
J. B. Plescia, E. M. Shoemaker, C. S. Shoemaker
  1537

Rb-Sr Systematics in Chondritic Metal
F. A. Podosek, J. C. Brannon, C. Perron, P. Pellas
  1538

Hydrogeological Evidence for a Possible 200 KM Diameter K/T Impact Crater in Yucatan, Mexico
K. O. Pope, A. C. Ocampo, C. E. Duller
  1539

Timing and Formation of Wrinkle Ridges in the Tyrrhena Patera Region of Mars
T. K. Porter, D. A. Crown, R. Greeley
  1540

Landslide Motion: Numerical Simulation for Earth and Mars
A. V. Potapov, B. A. Ivanov
  1541

Rb-Sr and Sm-Nd Ages for Lunar Norite 78235/78236: Implications on the U-Pb Isotopic Systematics of this High-Mg Rock
W. R. Premo
  1542

Nd-Sr Isotopic Signature of Tektites from the K-T Boundary on Haiti
W. R. Premo, G. A. Izett
  1543

PB Isotopes in Troctolite 76535
W. R. Premo, M. Tatsumoto
  1544

Laboratory Measurement of the Dependence of Particle Size on Thermal Conductivity Under Martian Conditions
M. A. Presley, P. R. Christensen
  1545

Lea Co. 002: A Second Kakangari-type Chondrite
M. Prinz, N. Chatterjee, M. K. Weisberg, R. N. Clayton, T. K. Mayeda
  1546

MAC88177: A New Type of Achondrite?
M. Prinz, N. Chatterjee, M. K. Weisberg, R. N. Clayton, T. K. Mayeda
  1547

Silicate Inclusions in Antarctic Irons
M. Prinz, N. Chatterjee, M. K. Weisberg, R. N. Clayton, T. K. Mayeda
  1548

SiC in Greenland Lake Sediments
C. A. Prombo, R. H. Nichols Jr., C. M. O'd. Alexander, P. D. Swan, R. M. Walker, M. Maurette
  1549

A Unique Eucrite Clast from the Kapoeta Howardite
A. Pun, K. Keil, G. J. Taylor, E. King
  1550

High Resolution Scanning Auger Electron Imaging of Microtomed Sections of Murchison Matrix
F. Radicati di Brozolo, I. C. Ivanov, C. L. Anderson
  1551

Horizontal Movements on Venus
J. Raitala, T. Tormanen
  1552

Solar Flare Noble Gases Preserved in Lunar Rock 61016
M. N. Rao, D. H. Garrison, D. D. Bogard
  1553

Xenon Isotope Systematics in Kapoeta and Ancient Solar Activity
M. N. Rao, D. H. Garrison, D. D. Bogard
  1554

Discussion of the Criteria for Recognition of Multiring Impact Basins--With Reference to the Simpson Desert Depression and the Vredefort Dome
W. U. Reimold, M. J. Duane
  1555

The Pretoria Saltpan--The First Firm Evidence for an Origin by Impact
W. U. Reimold, C. Koeberl, S. J. Kerr, T. C. Partridge
  1556

Chemistry and Petrology of Low-Nickel Stratospheric Particles: A New Class of Interplanetary Dust Particles or Not?
F. J. M. Rietmeijer
  1557

Hydrated Low-Nickel Stratospheric Particles Compared to the Smectite Subclass of Hydrated Interplanetary Dust Particles
F. J. M. Rietmeijer
  1558

Mylitta Fluctus, Venus: Flow Characteristics and Sources
K. M. Roberts, J. W. Head, J. E. Guest
  1559

The Significance of Ni-rich Magnetites for the Study of the K-T Boundary Event
E. Robin, D. Boclet, Ph. Bonte, L. Froget, C. Jehanno, R. Rocchia
  1560

Time Variable Spectral Feature at Apollinaris Patera, Mars
M. S. Robinson, M. O. Smith, J. B. Adams
  1561

Asteroid and Comet Impacts on Continental and Oceanic Sites: Computer Simulations of Cratering and Inferred Fe/Ir Ratios in Ejecta Vapor Compared with Fe/Ir Ratios Measured at the K/T Boundary from the Shatsky Rise (Pacific Ocean)
D. J. Roddy, R. A. Schmitt, S. H. Schuster
  1562

Some Features of the Distribution of Lunar Craters with Terraces and Faults
Zh. F. Rodionova, V. V. Shevchenko
  1563

Chromium Isotopic Diversity in Major Minerals of Carbonaceous Chondrites
M. Rotaru, J. L. Birck, C. J. Allegre
  1564

Geologic History and Channeling Episodes of the Chryse Planitia Region of Mars
S. L. Rotto, K. L. Tanaka
  1565

Thermal Infrared Observations of Mars (7.5-12.8 microns) During the 1990 Opposition
T. L. Roush, F. Witterborn, P. Lucey, A. Graps, J. Pollack
  1566

Characterization of a Mauna Kea Palagonite Using Transmission Electron Microsopy
T. L. Roush, D. Blake
  1567

Mantle Differentiation and Water Beneath Venus Craters
M. R. Rovetta
  1568

Impact-induced Metal-Silicate Melt Partitioning: First Results for Basalt
L. R. Rowan, T. J. Ahrens
  1569

Collisional-Disruption Experiments: Analysis of Identical Impacts
S. W. Rubin, M. J. Cintala, F. Hoerz
  1570

Lunar Sinuous Rilles Revisited: Another Possible Origin
S. W. Ruff
  1571

Not all Diamond From Chondritic Meteorites is Identical!
S. S. Russell, J. W. Arden, C. T. Pillinger
  1572

Laboratory Impact Experiments: Ejecta Velocity Distributions
E. V. Ryan, D. R. Davis
  1573

Hydrocode Predictions of Collisional Outcomes: Effects of Target Size
E. V. Ryan, E. Asphaug, H. J. Melosh
  1574

Naming Lunar Mare Basalts: Quo Vadimus?
G. Ryder
  1575

Study of Fuzzy Glassy Materials in Yamato 791438 Eucrite
K. Saiki, H. Takeda, B. Velde, H. Boyer, T. Tagai
  1576

Mid-Infrared (2,08-14 microns) Spectra of Powdered Stony Meteorites
J. W. Salisbury, D. M. D'Aria, E. Jarosewich
  1577

Self Organized Critical Faulting on Venus
C. G. Sammis, W. B. Banerdt
  1578

Complete Rare Gas Study of a Very Large Unmelted Cosmic Dust Particle from Greenland
Ph. Sarda, Th. Staudacher, C. J. Allegre
  1579

Magellan: Preliminary Description of Venus Surface Geologic Units
R. S. Saunders, R. E. Arvidson, J. W. Head III, G. G. Schaber, S. C. Solomon, E. R. Stofan, A. T. Basilevsky, J. E. Guest, G. E. McGill, H. J. Moore
  1580

Geology of Ovda Regio, Aphrodite Terra, Venus: Preliminary Results from Magellan Data
R. S. Saunders, J. W. Head III, R. J. Phillips, S. C. Solomon, R. Herrick, R. Grimm, E. R. Stofan
  1581

A High Resolution CCD Spectroscopic Survey of Low Albedo Main Belt Asteroids
S. R. Sawyer
  1582

Metastable Liquid Immiscibility in Zhamanshin Astrobleme Glasses as a Result of Sharp Supercooling of Impact Melts
L. V. Sazonova, N. N. Korotaeva
  1583

Zhamanshin Astrobleme Glasses: The Discovery of Stable Liquid Immiscibility and Mineral Unusual for Magmatic Rocks
L. V. Sazonova, N. N. Korotaeva
  1584

Zhamanshin Astrobleme Glasses: Traces of Initial Melt Non-Homogencity and Definition of Formation Parameters
L. V. Sazonova, N. N. Korotaeva, A. G. Simakin
  1585

The Geology and Distribution of Impact Craters on Venus: Initial Magellan Results
G. G. Schaber, R. E. Grimm, R. R. Herrick, R. J. Phillips, A. T. Basilevsky, J. E. Guest, M. A. Ravine, P. Schenk
  1586

Terrace Widths on Ganymede and Mars: The Strength and Composition(?) of Planetary Crusts
P. Schenk
  1587

Zelda's Cousin Revealed
A. J. Schilk, I. D. Hutcheon, R. A. Schmitt
  1588

Laboratory Simulation of Large Scale Fragmentation
R. M. Schmidt, K. R. Housen
  1589

Shatsky Rise Evidences Support Hypothesis that Both a Bolide (Asteroid or Comet) Impact (BI) and Deccan Trap Floodings (DT) Caused Cretaceous/Tertiary (K/T) Extinctions and Not Hypothesis of Either BI or DT Alone, I
R. A. Schmitt, Y.-G. Liu, R. J. Walker
  1590

Shatsky Rise Evidences Support Hypothesis that Both a Bolide (Asteroid or Comet) Impact (BI) and Deccan Trap Floodings (DT) Caused Cretaceous/Tertiary (K/T) Extinctions and Not Hypothesis of Either BI or DT Alone II
R. A. Schmitt, Y.-G. Liu, R. J. Walker
  1591

Atmospheric Effects of Oblique Impacts
P. H. Schultz
  1592

Styles of Ejecta Emplacement Under Atmospheric Conditions
P. H. Schultz
  1593

Impact Decapitation from Laboratory to Basin Scales
P. H. Schultz, D. E. Gault
  1594

Tectonic Reconstruction of the Ophir Planum Region, Central Valles Marineris, Mars (Or How Do You Make a Coprates Chasma?)
R. A. Schultz
  1595

The Contrast of Chemical Modeling with Petrographic Reality: Tapping of Apollo 15 Olivine-Normative Mare Basalt Magma
B. C. Schuraytz, G. Ryder
  1596

Preliminary Description of 60014, Top Half of Double Drive Tube 60014/60013
C. Schwarz
  1597

Paleolakes and Lacustrine Basins on Mars
D. H. Scott, J. W. Rice Jr., J. M. Dohm
  1598

Comparison of Shock Metamorphism in Carbonaceous and Ordinary Chondrites
E. R. D. Scott, K. Keil, D. Stoeffler
  1599

Shock Metamorphism of Carbonaceous Chondrites
E. R. D. Scott, K. Keil, D. Stoeffler
  1600

The Thermal and Fragmentation History of H Chondrites: Antarctic and Non-Antarctic Comparisons
D. W. G. Sears, P. H. Benoit
  1601

The Natural Thermoluminescence Properties of Basaltic and Lunar Meteorites
D. W. G. Sears, P. H. Benoit, H. Sears, J. D. Batchelor, S. Syme
  1602

Carbonaceous Inclusions in the Krymka (LL3) Chondrite
V. P. Semenenko, G. M. Kolesov, L. G. Samoilovich, N. V. Golovko, A. Yu. Ljul
  1603

Highland Component in the Luna 16 Soil
A. S. Semenova, N. N. Kononkova, E. V. Guseva
  1604

The Geology of Sif Mons and Gula Mons, Western Eistla Regio, Venus
D. A. Senske, J. W. Head
  1605

Mathematical Model of Thermal Processes in Cometary Nuclei
N. V. Seregina
  1606

Experimental Studies of the Volatility of V and MN
E. E. Shaffer, A. J. G. Jurewicz, J. H. Jones
  1607

Is the Chicxulub Structure in N. Yucatan a 200 KM Diameter Impact Crater at the K/T Boundary? Analysis of Drill Core Samples, Geophysics, and Regional Geology
V. L. Sharpton, B. C. Schuraytz, D. W. Ming, J. H. Jones, E. Rosencrantz, A. E. Weidie
  1608

Another (Re)View of Lunar Basaltic Magmatism
C. K. Shearer, J. J. Papike
  1609

Proton Induced X-ray Emission (PIXE) Micro-Analysis of Apollo 15 Green Glass. Preliminary Experiments
C. K. Shearer, D. D. Hickmott, P. S. Z. Rogers, J. J. Papike
  1610

Backscatter Mossbauer Spectrometer (BaMS) for Planetary Applications: Transducer Design Considerations
T. D. Shelfer, M. M. Pimperl, D. G. Agresti, E. L. Wills, R. V. Morris
  1611

Experimental Constraints on the Origin of Plagioclase-Olivine Inclusions and CA Chondrules
Y. J. Sheng, J. R. Beckett, I. D. Hutcheon, G. J. Wasserburg
  1612

MG Self-Diffusion in Spinel: Constraints on the Thermal History of Plagioclase-Olivine Inclusions
Y. J. Sheng, G. J. Wasserburg, I. D. Hutcheon
  1613

Polytopic Vector Analysis in Igneous Petrology: Application to Lunar Petrogenesis
J. W. Shervais, R. Ehrlich
  1614

Auto-Metasomatism of the Western Lunar Highlands: Result of Closed System Fraction and Mobilization of a KREEPy Trapped Liquid
J. W. Shervais, S. K. Vetter
  1615

Scientific Problems of Choosing the Site for a Lunar Outpost
V. V. Shevchenko
  1616

Dating Lunar Granites by the K-Ca Chronometer
C.-Y. Shih, H. Wiesmann, L. E. Nyquist
  1617

Diffraction Model of the Negative Polarization of Light Scattering by Atmosphereless Cosmic Bodies
Yu. G. Shkuratov, L. Ya. Melkumova
  1618

The Comparative Albedo Analysis of Powdered Substances and Their Mixture
Yu. G. Shkuratov, N. S. Olifer, O. I. Kvaratshelia, A. S. Kachanov
  1619

Connection Between the Slope of Brightness-Phase Curve and Lunar Albedo
Yu. G. Shkuratov, N. V. Opanasenko, L. A. Akimov
  1620

Is There Polarimetric Q-Effect for the Moon, Asteroids, and Laboratory Artificial Samples?
Yu. G. Shkuratov, N. V. Opanasenko, N. S. Olifer
  1621

Hydrothermal Processing of Cometary Volatiles--Application to Triton
E. L. Shock, W. B. McKinnon
  1622

Asteroid Flux and Impact Cratering Rate on Venus
E. M. Shoemaker, R. F. Wolfe, C. S. Shoemaker
  1623

"Pre-Compaction" Cosmogenic Xenon in Krymka Chondrite
A. Shukolyukov
  1624

The Calculation of Greenhouse Effect in the Venus Atmosphere
Yu. I. Sidorov, S. V. Parot'kin
  1625

Tektite Glass from the Cretaceous-Tertiary Boundary in Haiti
H. Sigurdsson, S. D'Hondt, M. A. Arthur, T. J. Bralower, J. C. Zachos, M. van Fossen, J. E. T. Channell
  1626

Petrography of a Suite of Refractory Inclusions from the Leoville, Efremovka and Vigarano Carbonaceous Chondrites
S. B. Simon, L. Grossman
  1627

Dynamic Models for Ridge Belt Formation on Venus
M. Simons, S. C. Solomon, B. H. Hager
  1628

Dust Production Rates in Eight Comets
P. D. Singh, A. A. de Almeida, W. F. Huebner
  1629

Determination of Solar-Proton Fluxes Using Carbon-14 in Lunar Rocks
J. M. Sisterson, H. Roman, J. S. Vogel, J. R. Southon, R. C. Reedy
  1630

Origin of Chondrules by Droplet Coalescence: an Alternative to the Dust-Ball Hypothesis
W. R. Skinner
  1631

Mars Radar Reflectivity Images from 1988 and 1990 CW Spectra
M. A. Slade, R. S. Hudson, T. C. O'Brien, R. F. Jurgens
  1632

Effects of a Giant Impact on Uranus
W. L. Slattery, W. Benz, A. G. W. Cameron
  1633

Is the "Mid-Cretaceous Unconformity" in the Gulf of Mexico a Cretaceous-Tertiary Boundary Impact-Wave Erosion Surface?
J. Smit, W. Alvarez
  1634

Microkrystites and (Micro)Tektites at the KT Boundary: Two Different Sources or One?
J. Smit, A. Montanari, W. Alvarez
  1635

Energy Partitioning, Melting, and Vaporization for Impact on Finite Sized Planets
C. L. Smither, T. J. Ahrens
  1636

Divnoe Meteorite: Preliminary Results of Rb-Sr Age Dating
M. I. Smoliar, M. I. Petaev, Yu. A. Shukolyukov
  1637

Gravitational Spreading of Danu, Freyja and Maxwell Montes, Venus
S. E. Smrekar, S. C. Solomon
  1638

Basalt Boulders from Apollo 14 "Fall-Apart" Efforts: Mineralogy and Petrology
G. A. Snyder, L. A. Taylor
  1639

In Search of the urKREEP Reservoir: Trapped Residual Lunar Magma Ocean Liquid in the Interstices of Upper Mantle Cumulates
G. A. Snyder, L. A. Taylor
  1640

Whitlockite-rich Basalts from 4-10 MM Boulders at Apollo 14: Mineralogy and Petrology
G. A. Snyder, L. A. Taylor
  1641

K-Frac and REEP-Frac Immiscible Liquids at Apollo 14: A SIMS Search for the Real urKREEP Composition
G. A. Snyder, L. A. Taylor, G. Crozaz
  1642

Geochemistry of REEPy Basalts: A New Basalt Suite from Apollo 14
G. A. Snyder, L. A. Taylor, Y. G. Liu, R. A. Schmitt
  1643

Determining Parental Magmas for Mare Basalts: an Interim Proposal and Synthesis
G. A. Snyder, L. A. Taylor, C. R. Neal
  1644

The Sources of Mare Basalts Revisited: A Model Involving Lunar Magma Ocean Crystallization, Plagioclase Entrainment, and Trapped Instantaneous Liquid
G. A. Snyder, L. A. Taylor, C. R. Neal
  1645

Venus Tectonics: The Perspective from Magellan at the Half-way Point
S. C. Solomon, J. W. Head, W. M. Kaula, D. McKenzie, B. E. Parsons, R. J. Phillips, G. Schubert, S. W. Squyres, M. Talwani
  1646

Variations in the Iridium Content of the Upper Mantle of the Earth
B. Spettel, H. Palme, D. A. Ionov, L. N. Kogarko
  1647

Microbeam Titanium Isotopic Analysis by Resonance Ionization Mass Spectrometry
D. R. Spiegel, M. J. Pellin, W. F. Calaway, J. W. Burnett, S. R. Coon, C. E. Young, D. M. Gruen, A. M. Davis, R. N. Clayton
  1648

Determination of Trace Elements in Meteorites Using Inductively Coupled Mass Spectrometry
A. H. Spitz, J. Ruiz
  1649

Morphology and Evolution of Coronae and Ovoids on Venus
S. W. Squyres, D. L. Bindschadler, D. M. Janes, G. Schubert, V. L. Sharpton, E. R. Stofan
  1650

Tectonic Evolution of Lavinia Planitia, Venus
S. W. Squyres, S. L. Frank, G. E. McGill, D. McKenzie, B. E. Parsons, S. C. Solomon
  1651

Rare Earth and Trace Element Abundances in Individual IDPs
F. J. Stadermann
  1652

The Shadow Function of Statistically Rough Surface: The Computer Simulation
D. G. Stankevich, A. S. Kachanov, Yu. G. Voylov, Yu. G. Shkuratov
  1653

Variability of Polarised Light of Venus from Ground Based Observations in 1980
O. M. Starodubtseva
  1654

CO and NI as Incompatible Elements in the Lunar Mantle: Implications for fO2 and the Petrogenesis of Apollo 15 Green Glass
A. M. Steele, R. O. Colson, L. A. Haskin
  1655

Characteristic Zoning and Compositions of C3 Forsterites
I. M. Steele
  1656

Forsterite Compositions in Antarctic Micrometeorites Compared with Other Extraterrestrial Samples
I. M. Steele
  1657

First Occurrence of Beusite in an Iron Meteorite: Its Composition and Crystal Structure
I. M. Steele, J. Pluth, E. Olsen, A. M. Davis
  1658

High Resolution Scanning Ion Imaging and Analysis of Submicron Inclusions in Meteoritic Forsterite
I. M. Steele, W. Wolbach, J. Chabala
  1659

Dynamo Magnetic Field Generation in the Solar Nebula
T. F. Stepinski
  1660

Ionization State and Magnetic Fields in the Solar Nebula
T. F. Stepinski
  1661

On the Number of Planetary Bodies Created in the Outer Solar System
S. A. Stern
  1662

Sm-Nd Systematics of Mesosiderites
B. W. Stewart, Q. C. Cheng, D. A. Papanastassiou, G. J. Wasserburg
  1663

Origin and Evolution of Coronae on Venus: an overview from Magellan
E. R. Stofan, V. L. Sharpton, G. Schubert, D. L. Bindschadler, D. M. Janes, S. W. Squyres, J. A. Cushing
  1664

Si, C and N Isotopes in SiC from Orgueil and Murchison: H- and He- Burning Components in Presolar Grains
J. Stone, I. D. Hutcheon, S. Epstein, G. J. Wasserburg
  1665

Common Landforms on Venus, Mars and Io
P. J. Stooke
  1666

Geology of the Inter-Corona Regions of Miranda
P. J. Stooke
  1667

Tests for Plate Spreading in Eistla Regio, Venus
P. J. Stooke
  1668

Uranium and Zirconium Enrichments in Libyan Desert Glass: Zircon Baddeleyite, and High Temperature History of the Glass
D. Storzer, C. Koeberl
  1669

Identifying and Using Weathered Antarctic Eucrites
M. M. Strait, D. W. Mittlefehldt, M. M. Lindstrom
  1670

Degradation of Fe-Mg Silicates in Hot CO2 Atmospheres: Applications to Venus
D. W. Straub, R. G. Burns
  1671

Glacial and Marine Chronology of Mars
R. G. Strom, J. S. Kargel, N. Johnson, C. Knight
  1672

Nitrogen Isotopic Composition of Type 3 Ordinary Chondrites
N. Sugiura, K. Kiyota, K. Hashizume
  1673

Accretion of Fine Particles: Preliminary Experiments
N. Sugiura, T. Okada, K. Kiyota
  1674

Tesserae are not Alterted Plains, Venus
A. L. Sukhanov
  1675

Two Probable Hot SPOT Paths on Venus
A. L. Sukhanov
  1676

Identification of Model Abundances in the Spectra of Natural and Laboratory Pyroxene Mixtures: A Key Component for Remote Analysis of Lunar Basalts
J. M. Sunshine, C. M. Pieters
  1677

Scanning Transmission Ion Microscopy (STIM): A New Technique for Density Mapping of Micrometeorites
S. R. Sutton, M. Cholewa, G. Bench, A. Saint, G. J. F. Legge, D. Weirup, G. J. Flynn
  1678

Chromium Valency in Individual Lunar Olivine Grains Using X-ray Absorption near Edge Structure (Xanes) Microanalysis
S. R. Sutton, K. W. Jones, B. Gordon, M. L. Rivers, J. V. Smith
  1679

Computed Microtomography (CMT) of the Internal Structures of Rare Extraterrestrial Objects
S. R. Sutton, P. Spanne, M. L. Rivers, K. W. Jones
  1680

Chemical Compositions of Refractory Inclusions from Leoville, Efremovka and Vigarano
P. J. Sylvester, L. Grossman
  1681

Mass-Velocity Relation of Fragments Produced by Catastrophic Impacts
Y. Takagi, M. Kato, H. Mizutani
  1682

Mineralogy of MAC88177 and Comparison with Augite-bearing Lodranite, Yamato 74357
H. Takeda, J. Saito, M. Miyamoto, T. Hiroi
  1683

Hydrologic Activity During Late Noachian and Early Hesperian Downwarping of Borealis Basin, Mars
K. L. Tanaka
  1684

Late Noachian Development of the Coprates Rise, Mars
K. L. Tanaka, R. A. Schultz
  1685

The Position of VLT-LT and VLT Rocks in Evolution of Lunar Basalt Magmatism
L. S. Tarasov, A. F. Kudryashova, V. A. Bobrov, E. G. Vertman, V. B. Baryshev, K. V. Zolotarev
  1686

Geochemical Tendencies of Different Types of Lunar Rocks by SRXFA Data
L. S. Tarasov, A. F. Kudryashova, A. A. Ulyanov, V. B. Baryshev, K. V. Zolotarev, A. Mashtalka, J. Frana
  1687

Differentiation Without Core Formation: S-Asteroids and Stony-Iron Meteorites
G. J. Taylor
  1688

Strategy for the Geologic Exploration of the Moon
G. J. Taylor, P. D. Spudis
  1689

Crustal Evolution on Earth: A Key to Understanding the Terrestrial Planets
L. A. Taylor, J. O. Eckert Jr., C. R. Neal, G. Crozaz
  1690

Field Studies of Bronzite Granophyre, Vredefort Structure, South Africa
A. M. Therriault, W. U. Reimold
  1691

Fractionation Trends in an Artificial Regolith: Experimental Results
A. M. Therriault, M. J. Cintala, F. Cardenas
  1692

Mineralogical and Chemical Constraints on Parent Bodies for Hydrated Interplanetary Dust Particles
K. L. Thomas, L. P. Keller, W. Kloeck, D. S. McKay
  1693

Phobos: Surface and Solid Body Properties from Digital Shape Data
P. C. Thomas
  1694

Theoretical Modelling of Plinian Eruption Plumes on Earth and Venus
G. D. Thornhill
  1695

PB Isotopic Evidence for Remobilization of Sulfides in the Stillwater Complex
M. W. Thurber, B. K. Nelson, I. S. McCallum
  1696

The Thermal Erosion of Sinuous Rilles: Consequences of Down-Rille Variations in Lava Rheology, and Fluid-Dynamic Flow Regime
K. A. Tomkinson, L. Wilson
  1697

Core Formation by Giant Impacts
W. B. Tonks, H. J. Melosh
  1698

Thermobarometry of Lunar Cordierite-Troctolite in 15295, 101: Metamorphic Temperature and a Potential Barometer
A. H. Treiman
  1699

Venus: The Chemical Weathering of Pyrrhotite, Fe1-xS
A. H. Treiman, B. Fegley Jr.
  1700

Zagami: Trace Element Zoning of Pyroxenes by Synchrotron X-ray (SXRF) Microprobe, and Implications for Rock Genesis
A. H. Treiman, S. R. Sutton
  1701

Experimental and Theoretical Constraints on the Origin of Lithophile Element-PT Alloys
A. H. Treiman, J. H. Jones, B. Fegley Jr.
  1702

Analysis of PHOBOS Mission Gamma-ray Spectra for Mars: Two Approaches
J. I. Trombka, L. G. Evans, R. Starr, S. R. Floyd, S. W. Squyres, J. T. Whelan, G. J. Bamford, R. L. Coldwell, Yu. A. C. Rester, A. Surkov, L. P. Moskaleva, V. P. Kharyukova, O. S. Manvelyan, Ye. S. Zaitseva, Smirno
  1703

Correlation of Multiple Reflections from the Venus Surface with Topography
K. A. Tryka, D. O. Muhleman, B. Butler, G. Berge, M. Slade, A. Grossman
  1704

Effects of Media Mesostructure on Intact Capture
P. Tsou, D. E. Brownlee, J. M. Williams, A. L. Albee
  1705

Experiments on Reaction Between Forsterite and Si-rich Gas
A. Tsuchiyama, N. Imae, M. Kitamura
  1706

Speckle Interferometric and Polarimetric Estimates of Vesta's Shape and Size
V. S. Tsvetkova, V. N. Dudinov, S. B. Novikov, Yu. G. Shkuratov, V. G. Vakulik, A. P. Zheleznyak, Ye. A. Pluzhnik
  1707

On Origin of Cosmogenic Ne-21 Excess in SiC of Chondrites
G. K. Ustinova, A. K. Lavrukhina
  1708

Isotopic Behavior of MG and SI During Condensation Process of Silicates
C. Uyeda, A. Tsuchiyama
  1709

In-Situ Planetary Surface Analyses: The Potential of X-ray Diffraction with Simultaneous X-ray Fluorescence
D. T. Vaniman, D. L. Bish, S. J. Chipera
  1710

Convection in the 5-km Near Surface Layer of the Mars Atmosphere
V. G. Vasin, R. O. Kuzmin
  1711

Emissivity Effects on the Surface Temperature of Mars as Measured by the Infrared Thermal Mapper
D. F. Vaughan, J. R. Zimbelman
  1712

Occultation of SAO 187255 by Titan: Titan's Atmosphere
F. P. Velichko, V. V. Korokhin, Y. N. Krugly, V. G. Shevchenko
  1713

Effect of MN Substitution on the Spectral Properties of Goethites and Hematites
R. K. Vempati, R. V. Morris, H. V. Lauer Jr.
  1714

Multicomponent Noble Gas Structure in Diamond-rich Acid Residues from Efremovka CV3 Carbonaceous Chondrite
A. B. Verchovsky, A. V. Fisenko, L. F. Semjonova, Yu. A. Shukolyukov, U. Ott, F. Begemann
  1715

Melt Droplet Formation in Energetic Impacts
A. M. Vickery, H. J. Melosh
  1716

Production of Impact Melt in Craters on Venus, Earth, and the Moon
A. M. Vickery, H. J. Melosh
  1717

Astronomical Observatories on the Moon
F. Vilas
  1718

Aluminum-26: A Non-Uniform Heat Source in the Early Solar System
A. Virag, E. Anders, E. Zinner, R. S. Lewis
  1719

Exposure History of the Lunar Mare Basalt EETA 87521
S. Vogt, G. F. Herzog, J. Klein, R. Middleton
  1720

Venus' Outgassing Model Based on Argon Isotopic Data
V. P. Volkov, M. Ya. Frenkel
  1721

Photogeologic Units and Fracture Systems in the Equatorial and Midlatitude Regions of Callisto
R. Wagner, G. Neukum
  1722

Natural Shelter on Other Worlds
B. Walden
  1723

Ureilite Parent Body Size(s): Smelting Experiments
D. Walker, T. L. Grove
  1724

The Case for Subsurface Imaging on Venus by Magellan SAR
S. D. Wall, C. Elachi
  1725

The Role of Diffusion in the Isotopic Fractionation of Magnesium During the Evaporation of Forsterite
J. Wang, A. M. Davis, A. Hashimoto, R. N. Clayton
  1726

Horsehoe Orbit Drag
W. R. Ward
  1727

Spatial Density, Size-Frequency and Implications of Craters >20 microns on Gold and Aluminum Surfaces Exposed by LDEF
J. Warren, T. H. See, F. Cardenas, M. Laurance, S. Messenger, D. Brownlee, F. Hoerz
  1728

Geochemistry of Unique Achondrite MAC88177: Comparison with Polymict Ureilite EET87720 and "Normal" Ureilites
P. H. Warren, G. W. Kallemeyn
  1729

A 4.4-gram, Mostly Metal Rock from Apollo 14 with Attached, Cogenetic Silicates
P. H. Warren, E. A. Jerde, G. W. Kallemeyn
  1730

Ordinary Chondrites Reduced During Metamorphism
J. T. Wasson, G. W. Kallemeyn, A. E. Rubin, R. Whitlock, C. F. Lewis, C. B. Moore
  1731

Hydrogen, Carbon and Oxygen Isotopic Composition of Volatiles in Nakhla
L. L. Watson, P. D. Ihinger, S. Epstein, E. M. Stopler
  1732

Nature and Origin of Wrinkle Ridges in the Floor Material of Kasei Valles, Mars
T. R. Watters, R. A. Craddock
  1733

Wrinkle Ridge-Upland Scrap Transitions: Implications for the Mechanical Properties of Deformed Materials
T. R. Watters, M. J. Tuttle, D. Simpson
  1734

Dust Evolution in Solar Nebula Models with Generic Turbulence
S. J. Weidenschilling
  1735

The Relationship Between Surface Tectonic Style and Mantle Convection: Earth and Venus
S. A. Weinstein, P. Olson
  1736

Aqueous Alteration in CR2 Chondrites
M. K. Weisburg, M. Prinz
  1737

Thermal Modeling of Comet Kopff: Implications for the CRAF Mission
P. Weissman, C. Clause
  1738

A Preliminary Investigation of Aeolian Features on Venus Using Magellan Data
C. M. Weitz, R. E. Arvidson, R. Greeley, R. S. Saunders, C. Elachi, T. Farr, T. Parker, J. Plaut, E. Stofan, S. Wall
  1739

Carbonate and Sulfate Minerals in the Chassigny Meteorite
S. J. Wentworth, J. L. Gooding
  1740

Compositions of Glasses in Meteorite Y86032 and Comparisons to Other Feldspathic Lunar Meteorites
S. J. Wentworth, D. S. McKay
  1741

INAA of Ropy Glasses from the Apollo 12 and 14 Sites: Preliminary Results
S. J. Wentworth, D. J. Lindstrom, R. R. Martinez, A. Basu, D. S. McKay
  1742

Why Isn't Mars as Big as Earth?
G. W. Wetherill
  1743

Field Constraints on Remote Observations of Debris Flows and Lava Flows
K. X. Whipple, J. R. Zimbelman
  1744

Lunar Sinuous Rilles: Is There a Correlation Between Eruption Style and Lava Composition?
J. L. Whitford-Stark
  1745

Igneous Intrusion Models for Floor Fracturing in Lunar Craters
R. W. Wichman, P. H. Schultz
  1746

A Comparison of Solar Wind and Solar System Xenon Abundances
R. C. Wiens, D. S. Burnett, M. Neugebauer, R. O. Pepin
  1747

The Formation of Antipodal-Impact Terrains on Mars
D. A. Williams, R. Greeley
  1748

Parameterized Convection Models of the Degassing History of the Earth and Venus
D. R. Williams, V. Pan
  1749

Dark Talus Streaks on Mars are Similar to Aeolian Dark Streaks
S. H. Williams
  1750

The Plains Units of Southwestern Utopia Planitia, Mars: Constraints on an Ancient Martian Ocean
S. H. Williams, P. P. Stice
  1751

Neutral Buoyancy Zones in the Venus Lithosphere: Influence on Volcanic Landforms and the Presence or Absence of Magma Chambers
L. Wilson, J. W. Head
  1752

Explosive Eruptions on Asteroids: The Missing Basalts on the Aubrite Parent Body
L. Wilson, K. Keil
  1753

The Relationship Between the Height of a Volcano and the Depth to its Magma Source Zone: Some Popular Misconceptions
L. Wilson, E. A. Parfitt, J. W. Head
  1754

Weathering on Venus: Dependence of Mineralogy on Altitude and Atmospheric Composition
J. A. Wood, A. Hashimoto
  1755

Mineralogy on Venus and Areas of High Fresnel Reflection Coefficient Detected by Magellan Radar
J. A. Wood, K. B. Klose
  1756

On the Properties of Xylan, a Lubricant Paint used in the Dry-Nitrogen Sample-Handling Cabinets at NASA-JSC
I. P. Wright, C. P. Hartmetz, S. S. Russell, S. R. Boyd, C. T. Pillinger, C. Meyer
  1757

Elevation Distribution of Mars Topography
S. S. C. Wu, A. E. Howington-Kraus, K. Ablin
  1758

Origin of Moderately Volatile Elements in Primitive Meteorites
A. V. Wulf, H. Palme
  1759

Regolith Evolution on the Fayetteville Parent Body--The Mobile Trace Element Story
X. Xiao, M. E. Lipschutz
  1760

Lithophile Elements in Impact Process: Experimental Data
O. I. Yakovlev, Yu. A. Ljul
  1761

Chondrule Formation by Collisions Between Planetesimals
T. Yamamoto, T. Kozasa, R. Honda, H. Mizutani
  1762

Experimental Studies of Angular Momentum Transfer in Low Velocity Oblique Impacts: Implications for Asteriods
M. Yanagisawa, J. Eluszkiewicz, T. J. Ahrens
  1763

Efficiency of Angular Momentum Transfer for Iron Targets
M. Yanagisawa, M. Iwasaki, A. Yamori, N. Kawashima
  1764

Olivine Fassaite Basalt: an Unusual Achondrite from Antarctica
K. Yanai
  1765

The Test of the "Methane Thermostat" Model for Pluto's Atmosphere
L. A. Young, J. L. Elliot
  1766

Cr, P and SI in the Metal of Renazzo
B. Zanda, M. Bourot-Denise, C. Perron
  1767

Mineralogy of Phosphate-Silicate Inclusions in the Chaunskij Iron
N. I. Zaslavskaya, M. I. Petaev, N. N. Kononkova, L. D. Barsukova
  1768

A Coupled Subsurface Atmosphere Boundary Layer Model of H2O on Mars
A. P. Zent, R. M. Haberle, H. Houben, B. M. Jakosky
  1769

Preliminary 1:500,000-scale Geologic Mapping of Arsia Mons, Mars
J. R. Zimbelman
  1770

S-Process BA and Nd in Presolar Murchison SiC
E. Zinner, S. Amari, R. S. Lewis
  1771

New Radar-derived Topography for Tyrrhena Patera, Mars
S. H. Zisk, P. J. Mouginis-Mark, J. Goldspiel, M. A. Slade, R. M. Jurgens
  1772

Mineralogy of 12 Large "Chondritic" Interplanetary Dust Particles
M. E. Zolensky, D. Lindstrom
  1773

Meteoroid and Orbital Debris Record of the Long Duration Exposure Facility
M. E. Zolensky, T. H. See, D. Atkinson, M. Allbrooks, C. Simon, M. Finckenor, J. Warren, E. Christiansen, F. Cardenas
  1774

Mineralogy and Matrix Composition of Dark Clasts in the LEW 85300 Polymict Eucrite
M. E. Zolensky
  1775

Liquid Immiscibility in an Impact Melt: Or Why Are Blue Zhamanshinites Blue?
M. E. Zolensky, C. Koeberl
  1776

Mineralogy and Matrix Composition of CI Clasts in the Chondrite Breccia Kaidun
M. E. Zolensky, R. A. Barrett, A. V. Ivanov
  1777

Chemical Weathering of Olivines and Ferromagnesian Pyroxenes on the Surface of Venus
M. Yu. Zolotov
  1778

Pyrite Stability on the Surface of Venus
M. Yu. Zolotov
  1779

Redox Conditions of the Nearsurface Atmosphere of Venus I. Some Reevaluations
M. Yu. Zolotov
  1780

Redox Conditions of the Nearsurface Atmosphere of Venus. II. Equilibrium and Disequilibrium Models
M. Yu. Zolotov
  1781

Stability of Magnesium-and Maganese-bearing Carbonates on the Surface of Venus
M. Yu. Zolotov
  1782

Meteoroid Directionality on LDEF and Asteroidal Versus Cometary Sources
H. A. Zook
  1783

Lunar Horizon Glow and the Lunar Dust Exosphere
H. A. Zook, J. E. McCoy
  1784

A 40th Degree and Order Gravitational Field Model for Mars
M. T. Zuber, D. E. Smith, F. J. Lerch, R. S. Nerem, G. B. Patel, S. K. Fricke
  1785