Lunar and Planetary Institute






Ninteenth Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

Conditions Required for Formation of Water Ocean on an Earth-Sized Planet
Y. Abe
  1001

A New Theory for the Shock Production of Glasses and High Pressure Phases in Planetary Silicates
T. J. Ahrens
  1002

Stable Isotopes in the Ordinary Chondrites: Characterisation of Isotopically Anomalous Phases
C. M. O'd. Alexander, J. W. Arden, D. McGarvie, N. Schelhaas, U. Ott, I. P. Wright, C. T. Pillinger
  1003

Analysis of Discrete Impact Events from the Gioto Comet Halley Dust Impact Experiment
W. M. Alexander, S. Goad, J. Pollock, W. G. Tanner, J. A. M. McDonnell
  1004

Cosmogenic Radionuclides in Antarctic and Non-Antarctic Meteorites. I. Aluminum-26
V. A. Alexeev
  1005

Cosmogenic Radionuclides in Antarctic and Non-Antarctic Meteorites. II. Manganese-53
V. A. Alexeev
  1006

Lineament Analysis and Tectonic Interpretation for the Central Thrsis Region, Mars
R. C. Anderson
  1007

Radiation Protection Issues and Techniques in Support of Lunar Base Operations
J. A. Angelo Jr., R. G. Madonna, W. Quam
  1008

Isotopically Heavy Carbon in the Allende Meteorite--New or Previsously Recognised Phases?
R. D. Ash, J. W. Arden, C. O. Alexander, M. M. Grady, I. P. Wright, C. T. Pillinger
  1009

Lithospheric Delamination on Earth and Venus
L. D. Ashwal, K. Burke, V. L. Sharpton
  1010

Morphologic Patterns in Lunar Mare Wrinkle Ridges and Kinematic Implications
J. C. Aubele
  1011

Characteristics of Domes on Venus and a Comparision with Terrestrial Cinder Cones and Oceanic Volcanic Edifices
J. C. Aubele, J. W. Head, E. N. Slyuta, A. T. Basilevsky
  1012

Beryllium-10 and Aluminium-26 Contents of Bur Gheluai
D. Aylmer, C. Tuniz, M. Guyton, G. Herzog, A. Maras, R. Middleton, J. Klein
  1013

Global Dynamic Stress Modelling on Venus
W. B. Banerdt
  1014

Constraining Mars Soil Mineralogical Composition: Palagonite vs. Iron Enriched Smectite Clays
A. Banin, L. Margulies, T. Ben-Shlomo, G. C. Carle, L. M. Coyne, J. B. Orenberg, T. W. Scattergood
  1015

The Martian Cratering Record and Its Implications for the Early History of the Planet
N. G. Barlow
  1016

Parameters Affecting Formation of Martian Impact Crater Eject Morphology
N. G. Barlow
  1017

Relative Plots of Venusian Impact Craters: Comparison with the Inner Solar System Cratering Record
N. G. Barlow
  1018

Venusian Coronae: Comparisons with Alba Patera, Mars
N. G. Barlow, J. R. Zimbelman
  1019

Noble Gas Components in the Mantle: Which Reservoirs Do MORBs Actually Sample?
B. L. Barraclough, K. Marti
  1020

Impact Holes and Impact Flux on Returned Solar Max Louver Material
R. A. Barrett, R. P. Bernhard, D. S. McKay
  1021

Northern Beta: Photogeologic Analysis of Venera 15/16 Images and Maps
A. T. Basilevsky
  1022

Volcanism and Tectonics of Venus
A. T. Basilevsky
  1023

Is Bedding and/or Size-Grading Present in Lunar Regolith Breccias?
A. Basu
  1024

Estimation of Recycled Proportion of Monomineralic and Crystalline Lithic Particles in Lunar Soils
A. Basu, C. Bangs
  1025

The Partitioning of Trace Elements Between Melilite and Liquid: an Experimental Study with Applications to Type B CAIs
J. R. Berckett, A. J. Spivack, I. D. Hutcheon, G. J. Wasserburg, E. M. Stolper
  1026

The Influence of Bulk Chemical Composition on the Production Rate of Cosmogenic Nuclides in Meteorites
F. Begemann, L. Schultz
  1027

Mars: Near-Infrared Comparative Spectroscopy During the 1986 Opposition
J. F. Bell III, T. B. McCord
  1028

An Earth-Crossing Source Body for the Basaltic Achondrites: Vesta's Son or Vesta's Nephew?
J. F. Bell
  1029

The 52-Color Asteroid Survey: Final Results and Interpretation
J. F. Bell, P. D. Owensby, B. R. Hawke, M. J. Gaffey
  1030

Solar He, NE and AR in Regolith Minerals: All Are Mixtures of Two Components
J. P. Benkert, H. Baur, A. Pedroni, R. Wieler, P. Signer
  1031

The Origin of the Moon: Further Studies of the Giant Impact
W. Benz, A. G. W. Cameron, H. J. Melosh
  1032

LEW 85313 Howardite: Clues to the Diogenite-Cumulate Eucrite Connection?
J. L. Berkley
  1033

Micrometer-Sized Impact Craters on the Solar Maximum Satellite: The Hazards of Secondary Ejecta
R. P. Bernhard, D. S. McKay
  1034

Ferroan Anorthosites and the Magma Ocean: Searching for Trends in the Sea of Confusion
M. G. Bersch, G. J. Taylor, K. Keil
  1035

Terrestrial Ages of Antarctic Meteorites Based on Thermoluminescence levels in Their Fusion Crust
N. Bhandari, D. Sengupta
  1036

Oxygen Isotope Studies in O+CO Reaction: Energy Constraints in Symmetry Selective Fractionation
S. K. Bhattacharya, M. H. Thiemens
  1037

The Comet Experiment: First Results
J. P. Bibring, J. Borg, A. Katchanov, Y. Langevin, P. Salvetat, Y. A. Surkhov, B. Vassent
  1038

The Infrared Observation of Mars and PHOBOS
J. P. Bibring, S. Cazes, M. Combes, G. Guyot, B. Gondet, Y. Langevin, P. Puget, F. Rocard
  1039

Definition and Characterization of Subtypes of the Venus Tesserae
D. L. Bindschadler, J. W. Head
  1040

Models for the Origin of Tessera Terrain on Venus
D. L. Bindschadler, J. W. Head
  1041

Distribution of Tesserae on Venus: Prediction Using Pioneer Venus and Venera Data
D. L. Bindschadler, J. W. Head, M. A. Kreslavsky, Yu. G. Shkurotov, A. T. Basilevsky
  1042

Exsolution Textures Produced by Annealing a Metal Alloy of Fremdlinge Composition
A. Bischoff
  1043

Metamorphism of Ordinary Chondrites--Information from a Study of Al-rich Chondrules
A. Bischoff
  1044

Formation of Al-rich Chondrules by Chondrule Collision and Splashing
A. Bischoff, H. Palme
  1045

The Chemical Composition of Dark Inclusions from the Allende Meteorite
A. Bischoff, H. Palme, B. Spettel, R. N. Clayton, T. K. Mayeda
  1046

Comet Nucleus Simulation Experiments: Mineralogical Aspects of Sample Preparation and Analysis
A. Bischoff, D. Stoeffler
  1047

Characterization of Interplanetary Dust by Low Voltage Scanning Electron Microscopy
D. Blake, T. Bunch, T. Reilly, R. Fleming
  1048

A Comparision of Allende Diamond with Diamond from Detonation Soot
D. Blake, F. Freund, T. Bunch, S. Chang, A. Tielens, N. R. Greiner
  1049

Constraints on the Origin of the 3.8 micron Mars Absorption Feature
D. L. Blaney, T. B. McCord
  1050

Laser Extracted Volatiles from Carbonaceous Chondrites
G. E. Blanford, E. K. Gibson Jr.
  1051

Laser Extracted Volatiles from Chondritic Interplanetary Dust Particles
G. E. Blanford, E. K. Gibson Jr.
  1052

Microbeam Analysis of Chondritic Interplanetary Dust Particles for Carbon, Oxygen, and Major Elements
G. E. Blanford, K. L. Thomas, D. S. McKay
  1053

Interpreting the Geologic History of Aeolian Sand Bodies from Remote Sensing Data
G. Blount, R. Greeley, P. R. Christensen, N. Lancaster
  1054

Opaque Assemblages in the Allende Meteorite: Evidence for Equilibrium at Low Temperatures (<770K) and High fO2-fS2
J. D. Blum, G. J. Wasserburg, I. D. Hutcheon, J. R. Beckett, E. M. Stolper
  1055

Methods of Venus Northern Area Radiolocation Map Synthesis Using Strip Images of "Venera-15" and "Venera-16" Space Stations
I. M. Bockstein, P. Chochia, M. Kronrod
  1056

Petrology of a Plagioclase-rich Forsterite-bearing Allende Inclusion
N. Z. Boctor, I. D. Hutcheon, G. J. Wasserburg
  1057

39Ar-40Ar Dating of Mesosiderites: A Case for Major Parent Body Disruption Less Than 4.0 GY Ago?
D. D. Bogard, D. Mittlefehldt, J. Jordan
  1058

Coesite, Glass, and Shocked Quartz at DSDP Site 612: Evidence for Nearby Impact in the Late Eocene
B. F. Bohor, W. J. Betterton, E. E. Foord
  1059

First Report on a New Meteorite Find from Seymour, Indiana
P. Bonneau, N. Shaffer, A. Basu
  1060

Atmospheric Entry of Micrometeorites Containing Organic Materials
P. Bonny, D. Balageas, D. Devezeaux, M. Maurette
  1061

Evidence for Meteoritic Enrichment of the Martian Regolith
M. B. Boslough
  1062

Angular Momentum Transport by Gravitational Torques in the Early Solar Nebula
A. P. Boss
  1063

F and CL Distribution in Apatites of the Stillwater Complex
A. E. Boudreau, I. S. McCallum
  1064

A Comparison of Pyroxene Versus Olivine Rich Interplanetary Dust Particles (IDPs) in Thin-Section
J. P. Bradley, M. S. Germani, D. E. Browniee
  1065

Martian Crater Interiors: Relationships with Ejecta, Diameter, Latitude, and Terrain
T. L. Bradley, N. G. Barlow
  1066

Nature and Origin of Matrix in the Unique Chondrite, Kakangari: A TEM Investigation
A. J. Brearley
  1067

Isotopic Heterogeneity and Correlated Isotope Fractionation in Purple FUN Inclusions
C. A. Brigham, I. D. Hutcheon, D. A. Papanastassiou, G. J. Wasserburg
  1068

Tsarev: Petrology and Bidirectional Reflectance Characteristics of a Black Chondrite
D. T. Britt, C. M. Pieters, M. I. Patayev, N. I. Zaslavskaya
  1069

Solubilities and Partitioning of Noble Gases in Mineral-Melt Systems--I. Synthesis and Reversal Experiments for AR in Anorthite and Coexisting Melt
C. L. Broadhurst, M. J. Drake, B. E. Hagee, T. J. Bernatowicz
  1070

Solubilities and Partitioning of Noble Gases in Mineral-Melt Systems--II, Synthesis Experiments for Ne, Ar, Kr, and Xe in Anorthite, Diopside, Forsterite, and Coexisting Melts
C. L. Broadhurst, M. H. Drake, B. E. Hagee, T. J. Bernatowicz
  1071

Solid-State Greenhouses and Their Role on Icy Satellites
R. H. Brown, D. L. Matson
  1072

Grain Size and Texture of Chondrule Populations in Mezo-Madaras
P. C. Buchanan
  1073

Thermal Processing of Allende Components in a Transient Parent Body Atmosphere
T. E. Bunch, S. Chang, D. Blake, P. Cassen, R. Reynolds, M. Podolak, J. Erlichman
  1074

Mossbauer Spectra of Weathered Stony Meteorites Relevant to Oxidation on Mars: II. Achondrites and SNC Meteorites
R. G. Burns, T. C. Solberg
  1075

Iron-rich Clay Minerals on Mars: Potential Sources or Sinks for Hydrogen and Indicators of Hydrogen Loss over Time
D. M. Burt
  1076

Lunar Production of Oxygen and Metals Using Fluorine: Concepts Involving Fluorite, Lithium, and Acid-Base Theory
D. M. Burt
  1077

Chemistry and Mineralogy of Early Archean Impact Deposits, Fig Tree Group, Barberton Greenstone Belt, South Africa
G. R. Byerly, D. R. Lowe, F. Asaro
  1078

Non-Atmospheric Noble Gases from CO2 Well Gases
M. W. Caffee, G. B. Hudson, C. Velsko, E. C. Alexander Jr., G. R. Huss, A. R. Chivas
  1079

Fremdlinge in Vigarano CAI 477B: Assemblages, Compositions, and Possible Formational History
C. Caillet, G. J. MacPherson, A. El Goresy
  1080

Gravity Analysis of Bell Regio, Venus, from Pioneer-Venus and Venera Data
B. A. Campbell, R. C. Kozak
  1081

Lunar Surface Scattering from New 3-cm Polarization and Phase Radar Data
B. A. Campbell, S. H. Zisk, P. J. Mouginis-Mark
  1082

A Possible Impact Structure in Amazonian Bolivia
K. E. Campbell, R. A. F. Grieve, Z. Pacheco, J. B. Garvin
  1083

Experimental Measurement of the Phase Functions of Meteorites and Terrestrial Rocks: Comparison with Theory and Observations of Asteroids
F. Capaccioni, M. A. Barucci, P. Cerroni, M. Fulchignoni
  1084

Radiometric Geochronology of the Eucrites Nuevo Laredo and Bereba
R. W. Carlson, F. Tera, N. Z. Boctor
  1085

No Evidence for Different Parent Bodies of Antarctic and Non-Antarctic H Chondrites: A Multivariate Study
J. Cashore, M. L. McKinney, H. Y. McSween Jr.
  1086

Drilling for Abiogenic Gas in the Siljan Impact Structure, Sweden: A Progress Report
J. R. Castano
  1087

Experimental Study of Catastrophic Fragmentation of "Differentiated" Targets
P. Cerroni, A. Fujiwara
  1088

North Kasei Valles--Geology and Hydrology
M. G. Chapman, D. H. Scott
  1089

238U, 235U, 234U in Lunar and Terrestrial Samples and the Determination of U238/U234
J. H. Chen
  1090

Ningbo: A New Iron Meteorite with Isotopically Anomalous AG
J. H. Chen, G. J. Wasserburg, W. Daode
  1091

High Resolution Thermal Imaging of Mars
P. R. Christensen, M. C. Malin
  1092

Field Research in the Extraterrestrial Environment: Implications for Planetary Scientists
T. M. Ciesla
  1093

Regolith Evolution in the Laboratory: Scaling Dissimilar Experiments
M. J. Cintala, F. Hoerz
  1094

Analogues for Magnetic Microspherules Associated with the K/T and Upper Eocene Extinction Events
S. M. Cisowski
  1095

Paleomagnetism of Manson Structure Cores Inconsistent with a K/T Link
S. M. Cisowski
  1096

Paleomagnetism of Unbrecciated Eucrites
S. M. Cisowski
  1097

Rock Magnetic Criteria for Distinguishing Lunar Samples as Suitable Paleomagnetic Recorders
S. M. Cisowski, M. Fuller
  1098

Exploration on the Surface of Mars
B. C. Clark
  1099

New Cosmic-Chemical-Memory Mechanism for Isotopic Anomalies
D. D. Clayton
  1100

Ureilites Are Not Igneous Differentiates
R. N. Clayton, T. K. Mayeda
  1101

Softened Terrain on Mars: The Ground Ice Interpretation Reconsidered
S. M. Clifford, J. R. Zimbelman
  1102

Stability of Chasma Walls in the Valles Marineris, Mars
G. D. Clow, H. J. Moore, P. A. Davis, L. R. Strichartz
  1103

Sublimation Rates in Icy Craters, Trenches, and Crevasses on Comets
J. E. Colwell, B. M. Jakosky, B. J. Sandor
  1104

Chondrule Texture: The Influence of Bulk Composition and Heating Time for Uniform Thermal Conditions
H. C. Connolly Jr., P. M. Radomsky, R. H. Hewins
  1105

Kauhako Crater and Channel, Kalaupapa, Molokai: A Preliminary Look at a Possible Analog to Lunar Sinuous Rilles
C. R. Coombs, B. R. Hawke
  1106

A Recent Survey of Localized Lunar Dark Mantle Deposits
C. R. Coombs, B. R. Hawke, P. Owensby
  1107

Thickness of Sedimentary Deposits at the Mouth of Outflow Channels
F. M. Costard
  1108

Origin of Grooved Features in the Hesperian/Noachian Cratered Terrain, Memnonia Quadrangle (MC-16), Mars
R. A. Craddock, R. Greeley, P. R. Christensen
  1109

Martian Channel Materials and the Formation of Channel Winds
R. A. Craddock, R. Greeley, P. R. Christensen, F. T. Aldrich
  1110

Conductivity of an Expanding Plasma Cloud Above a Hypervelocity Impact
D. A. Crawford, P. H. Schultz
  1111

Crater Depth/Diameter/Morphology Relationships on the Icy Satellites: Implications for Ice Rheology
S. K. Croft
  1112

Crater Ejecta Facies on Ganymede
S. K. Croft
  1113

Crater Populations on the Uranian Satellites
S. K. Croft
  1114

Miranda's Inverness Corona Interpreted as a Cryovolcanic Complex
S. K. Croft
  1115

Crater and Crater Forming Populations on Ganymede and Callisto
S. K. Croft, E. D. Duxbury
  1116

Consideration of Hydromagmatic Origins for Hadriaca Patera and Tyrrhena Patera
D. A. Crown, R. Greeley, M. F. Sheridan
  1117

Rare Earth Elements (REE) in the Unique Achondrite LEW 86010
G. Crozaz, L. L. Lundberg, G. McKay
  1118

Divergent Plate Boundary Characteristics in Eastern Aphrodite Terra, Venus
L. S. Crumpler, J. W. Head
  1119

Split and Separated Topography on Earth's Seafloor: A Comparison to Bilateral Symmetry in Aphrodite Terra, Venus
L. S. Crumpler, J. W. Head
  1120

Topographic Steps Occurring Across Linear Discontinuities, Aphrodite Terra, Venus: A Comparison to Thermal Boundary Layer Predictions
L. S. Crumpler, J. W. Head
  1121

On the Presence of Unweathered Lithic Fragments in Viking Lander 1 Soil
M. A. Dale-Bannister, R. E. Arvidson, H. J. Moore
  1122

The Density of Ammonia-Water Solution to 400 MPa (4 Kilobars)
W. Dalrymple III, D. L. Hogenboom, G. J. Consolmagno
  1123

Thermal Infrared Reflectance Spectroscopy of Impact-Related Rocks: Implications for Geologic Remote Sensing of Mars and Earth
D. D'Aria, J. B. Garvin
  1124

Age of A15 Norites, Continued
E. J. Dasch, C.-Y. Shih, B. M. Bansal, H. Wiesmann, L. E. Nyquist
  1125

Silicate-Sulphur Interactions on Io--Implications for Pele Type Plumes
A. G. Davies, L. Wilson
  1126

Rare Earth Elements in a Hibonite-rich Allende Fine-Grained Inclusion
A. M. Davis, G. J. MacPherson
  1127

An Ion Microprobe Study of Plagioclase-rich Clasts in the North Haig Polymict Ureilite
A. M. Davis, M. Prinz, J. R. Laughlin
  1128

Morphometric Analysis of Some Canyons in Noctis Labyrinthus, Mars: Comparison with Hawaiian Runoff and Sapping Channels
P. A. Davis, K. L. Tanaka
  1129

Assessment of Biases in Collections of Greenland Micrometeorites: The "Blue Ice I" Project of January 1988 in Antarctica
M. D. Angelis, M. Maurette, M. Pourchet
  1130

The Origin of Al26
D. Dearborn, T. Lee, G. J. Wasserburg
  1131

Electron-Microprobe and Cathodoluminescence Studies of Unequilibrated Ordinary Chondrites, II. Chondrule Mesostases in ALHA77214 and DHAJALA
J. M. Dehart, G. E. Lofgren, D. W. G. Sears
  1132

Ephemeral Martian Lakes: Temporary Ponding and Local Sedimentation
R. A. de Hon
  1133

Valley Terminal Deposits: The Martian Sedimentary Record
R. A. de Hon
  1134

Lewis Cliff 86010, an ADORable Antarctican
J. S. Delaney, S. R. Sutton
  1135

Trace Element Content of Feldspar from Achondrites and Lunar Breccias
J. S. Delaney, S. R. Sutton, J. V. Smith
  1136

Depths of Mare Source-Regions: Limits Imposed by Buoyancy-Driven Melt Segregation
J. W. Delano
  1137

Inter-Element Correlations Among Mare Basalts and Pristine Lunar Glasses
J. W. Delano, S. S. Hughes, R. A. Schmitt
  1138

The K-T Boundary Debate--A Volcanological Perspective
S. L. de Silva, V. L. Sharpton
  1139

A Small Scale Sr-Nd Study of the Footwall Breccia (Sudbury, Canada)--A Case Study for Isotope Systematics of Polymict "Granulitic" Breccias
A. Deutsch, D. Buhl, R. Lakomy
  1140

Late-Stage Enrichment of GE in the Magma Ocean: Evidence from Lunar Basalts
T. L. Dickinson, R. W. Bild, G. J. Taylor, K. Keil
  1141

Largest Impact Craters on Planetary Bodies and Implications
A. Dollfus, M. Deschamps, J.-M. Chevallier, A. Cailleux
  1142

Collisions of Macroscopic Fluffy Aggregates in the Primordial Solar Nebula
B. Donn, P. Meakin
  1143

Can We Relate the Volatiles on Earth and Mars to Those Contained in Cl-Chondrites?
G. Dreibus, R. Rieder, H. Waenke
  1144

Rheology of Water-Ammonia Ice: First Results
W. B. Durham, S. H. Kirby, L. A. Stern
  1145

Harmonic Expansion Model for the PHOBOS Figure
T. Duxbury
  1146

Extraterrestrial Dust in Antarctic Firn
A. Eberhardt, P. Eberhardt
  1147

Herschel Basin Ejecta and Some Implications for Deciphering the Geologic History of the Martian Cratered Highlands
K. S. Edgett, R. Greeley, P. R. Christensen
  1148

Morphology and Distribution of Venus Coronae: Evidence for an Endogenic Origin
M. S. Edmunds, V. L. Sharpton, K. Burke
  1149

Photometric Characterisation of the Lunar Surface Using Hapke's Equation
N. D. Efford, L. Wilson
  1150

Detection of CM Sized Spheroidal Fe-Mn Bodies in Rhyolite from Lake Mien, an Impact Site in Southern Sweden: A Preliminary Report
A. Ekelund, E. U. Engstroem
  1151

Ion Probe Study of Clinopyroxenes from Cumulate Rocks of the Bay of Islands Ophilite: Evidence for Very Depleted Primary Magmas
D. Elthon, N. Shimizu, J. F. Casey, S. C. Komor
  1152

Compaction of Icy Satellites
J. Eluszkiewicz
  1153

Cosmogenic Nuclide Production Rates: Depth Dependence of 14C Production
P. A. J. Englert, A. J. T. Jull, D. J. Donahue, R. C. Reedy
  1154

CR Isotopic Anomalies in Cr-rich Murchison Spinels
T. M. Esat, T. R. Ireland
  1155

MG Isotopic Composition of Murchison Spinels
T. M. Esat, T. R. Ireland
  1156

MG Isotopic Composition of Rim Layers in the Vigarano inclusion VI-1
T. M. Esat, D. A. Wark, S. R. Taylor
  1157

Cosmic-Ray Production Rates for 3He, 21Ne, 38Ar, 83Kr, and 126Xe in Chondrites Based on 81Kr-Kr Exposure Ages
O. Eugster
  1158

Guangan (L6) and Ningqiang (CV3): Exposure Ages, Radiogenic Ages and Chemical Abundances
O. Eugster, Th. Michel, S. Niedermann, M. Burger, U. Kraehenbuehl
  1159

Thermochemical Kinetics of SO2 Reactions with Possible Venus Crustal Minerals: First Data for Calcite
B. Fegley Jr.
  1160

Compositional Relationships of Target and Melt on Zhamanshin Astrobleme
V. I. Feldman, V. M. Rjachovsky
  1161

Rate of Impact Melts Cooling and Mineral Compositions
V. I. Feldman, I. N. Bindeman, L. V. Sazonova
  1162

Chemism of Diaplectic Transformation in Garnet, Biotite and Staurolite
V. I. Feldman, L. V. Sazonova, N. N. Kononkova
  1163

K-Ar Geochronology in the Selvagens, Porto Santo and Madeira Islands (Eastern Central Atlantic): A 30 m.y. Spectrum of Submarine and Subaerial Volcanism
M. P. Ferreira, C. R. Macedo, J. F. Ferreira
  1164

A Comparison of Lava Flow Rheology Calculations for High-Resolution Data Sets from Hawaii and Mars
J. H. Fink, J. R. Zimbelman
  1165

Proxy Solar Cyclicity Recorded in Grain Sizes of Varved Sediments
S. A. Finney, C. R. Williams, C. P. Sonett
  1166

Metallic Particle EMI-The Result of the Metal Crystallization in CAI Melt
A. V. Fisenko, K. I. Ignatenko, A. K. Lavrukhina
  1167

The Isotopic Composition of Hydrogen in Acid-Insoluble Residues of Efremovka CV Chondrite
A. V. Fisenko, A. L. Devirts, E. P. Lagutina, L. F. Semjonova, A. K. Lavrukhina, Yu. A. Shukolyukov
  1168

A Microdiamond--Additional Support for Extraterrestrial Signatures near the K/T Boundary in Israel
A. Flexer, A. Rosenfeld, A. Honigstein, M. Dvorachek
  1169

Atmospheric Entry Heating of Cosmic Dust
G. J. Flynn
  1170

Is the Stratospheric Cosmic Dust an Unbiased Sample of the Interplanetary Dust Cloud at I Au?
G. J. Flynn
  1171

The Enstatite Chondrite-Achondrite Link
R. A. Fogel, P. C. Hess, M. J. Rutherford
  1172

Transcurrent Faulting on Mars: The Gordii Dorsum Escarpment
R. D. Forsythe, J. R. Zimbelman
  1173

Preparing for Mars: Loess, and Why We Should Study It
P. W. Francis
  1174

Classification of Class II Ridge Belts on Venus
S. L. Frank, J. W. Head
  1175

Ridge Belts on Venus: Evidence for Compressional Origin
S. L. Frank, J. W. Head
  1176

Composition of Chondrules and Parent Materials
K. Fredriksson
  1177

Vredefort Bronzite Granophyre: Chemical Evidence for Origin as an Impact Melt
B. M. French, R. L. Nielsen
  1178

Iridium in the Vredefort Bronzite Granophyre: Impact Melting and Limits on a Possible Extraterrestrial Component
B. M. French, C. J. Orth, L. R. Quintana
  1179

Large Impact Basins as a Test of the Mega-Impact Origin of the Mars Crustal Dichotomy
H. Frey, R. A. Schultz
  1180

Extent of Buried Cratered Terrain Underlying the Highland/Lowland Transition Zone in Eastern Mars
H. Frey, J. A. Semeniuk
  1181

The Discovery and Study of Cosmic Dust in Granites
C. Fu, H. Wang, X. Liu
  1182

The Relationship Between the Concentrations of AR in Vapor Growth Diamond and the Partial Pressure of AR
K. Fukunaga, J. Matsuda, K. Nagao, K. Ito
  1183

The Importance of Closed Folds in Muong-Nong-Type Tektites
D. S. Futrell
  1184

Geologic Analysis of SIR-B Data for Kilauea Volcano, HI: Implications for Interpretation of Venera 15/16 and Magellan Data of Volcanic Centers on Venus
L. Gaddis
  1185

Thermal History of the Asteroid Belt: Implications for Accretion of the Terrestrial Planets
M. J. Gaffey
  1186

Noble Gases in Grain-Size Separates from Pesyanoe: A Study in Anomalous Acquisition of Terrestrial Xenon
D. H. Garrison, C. T. Olinger, C. M. Hohenberg, M. W. Caffee
  1187

Remote Sensing of Planetary Analogue Landforms in SW Iceland
J. B. Garvin, R. S. Williams Jr.
  1188

Geologic Remote Sensing of Terrestrial Impact Craters
J. B. Garvin, R. A. F. Grieve, C. Schnetzler, F. Honey
  1189

Dielectric Properties of Meteorites: Implications for Radar Observations of PHOBOS
J. B. Garvin, F. T. Ulaby, W. Webster
  1190

Lunar Observer Laser Altimeter: Geoscience Applications
J. B. Garvin, M. T. Zuber, J. L. Bufton
  1191

Dispersion Hardening of Ice: Implications for Topographic Relaxation on the Icy Satellites
P. E. Geissler, S. K. Croft
  1192

Structural-Chemical Peculiarities of the State of Silicon in the Processes of Shock Metamorphysm
M. V. Gerasimov, Yu. P. Dikov, L. M. Mukhin, V. I. Rekharsky
  1193

Automated Point Count Analysis of Interplanetary Dust Particle Thin-Sections
M. S. Germani, J. P. Bradley
  1194

Hydrogen Abundances in Apollo 16 and 17 Deep Drill Core and 79001/79002 Core Samples
E. K. Gibson Jr., R. Bustin, P. Mannion
  1195

Trace Elements at the K-T Boundary: Evidence for a Single Impact?
I. Gilmour, E. Anders
  1196

Montagnais Impact Crater: Possible Source of the North American Tektite Strewn Field
B. P. Glass
  1197

Constraints on the Subsurface Structure of Europa
M. P. Golombek, B. Banerdt
  1198

The Relative Importance of Faulting versus Folding in the Formation of Planetary Wrinkle Ridges
M. P. Golombek, J. Plescia, B. Franklin
  1199

Mg-Carbonate Weathering Products in Antarctic Meteorites: Isotopic Composition and Origin of Nesquehonite from LEW85320
J. L. Gooding, A. J. T. Jull, S. Cheng, M. A. Velbel
  1200

Petrology of the Unique Achondrite LEW 86010
C. A. Goodrich
  1201

Nd and SR Isotopic Analyses of Metallic Iron-Bearing Volcanics from Disko Island, Greenland
C. A. Goodrich, P. J. Patchett
  1202

Nd and SR Isotopic Analyses of the Ureilite Novo Urei: Evidence for a Young LREE-Enriched Component
C. A. Goodrich, P. J. Patchett, M. J. Drake
  1203

A Search for Satellites and Dust Belts Around Asteroids: Negative Results
J. Gradie, L. Flynn
  1204

Surface Temperature and Variability of an Active Lava Lake: Lessons to Be Applied to Io
J. Gradie, P. J. Mouginis-Mark, J. Hayashi, L. Flynn
  1205

Alteration Production on the LEW 85320 H5 Chondrite
M. M. Grady, E. K. Gibson Jr., I. P. Wright, C. T. Pillinger
  1206

The Degradational History of Etched/Channeled Terrains West and Northwest of Isidis
J. A. Grant, P. H. Schultz
  1207

Resurfacing Events in the Lunae Planum-Xanthe Terra Region of Mars
T. D. Grant, H. Frey
  1208

Resurfacing Events in the Tempe Terra Region of Mars
T. D. Grant, H. Frey, J. A. Semeniuk
  1209

A Model for Venusian Coronae as Relaxed Silicic Flows
A. Gratz
  1210

Optical Microscopy and TEM of Shocked Material from the Clear Creek, Colorado K/T "Magic Layer"
A. Gratz, P. Pongratz, A. Preisinger, J. Christie, B. Bohor, I. Frey
  1211

Shock of Deformed Quartz
A. Gratz, J. A. Tyburczy, J. Christie, T. J. Ahrens, P. Pongratz
  1212

Correlation of Radar Backscatter and Aeolian Roughness: Implications for Venus
R. Greeley, N. Lancaster, R. Sullivan, R. S. Saunders, E. Theilig, S. Wall, A. Dobrovolskis, B. R. White, J. D. Iversen
  1213

Planetesimal Collision Rates: Transition from Random to Keplerian Approaches
R. Greenberg, A. Carusi, G. B. Valsecchi
  1214

Water and the Thermal History of the CM Carbonaceous Chondrite Parent Body
R. E. Grimm, H. Y. McSween Jr.
  1215

Generation and Evolution of Crust on Venus: Implications of Viscous Relaxation Models
R. E. Grimm, S. C. Solomon
  1216

Tests of Crustal Divergence Models for Venus
R. E. Grimm, S. C. Solomon, L. S. Crumpler, J. W. Head
  1217

Allan Hills 85085: an Out-of-the-Ordinary, Enstatite-rich Carbonaceous Chondrite
J. N. Grossman, A. E. Rubin, G. J. MacPherson
  1218

Carbon and Oxygen Isotopic Compositions of Individual Spinel Crystals from the Murchison Meteorite
L. Grossman, A. J. Fahey, E. Zinner
  1219

Stability of Hibonite and CaAl4O7 in the Solar Nebula
L. Grossman, C. A. Geiger, O. J. Kleppa, B. O. Mysen, J. M. Lattimer
  1220

Aeolian Control of Materials Exposed in the Equatorial Region of Mars
E. A. Guinness, R. E. Arvidson
  1221

Hydrothermally Supplied Ground Water: A Mechanism for the Formation of Small Martian Valleys
V. C. Gulick, M. S. Marley, V. R. Baker
  1222

Oxygen Isotopic Contamination During Hf-HCl Dissolution of Bulk Carbonaceous Chondrites
J. Halbout, F. Robert, M. Javoy
  1223

Thermal Emission and Reflectance Spectroscopy
B. Hapke
  1224

Two Dark Asteroids with Very Small Opposition Effects
A. W. Harris, J. W. Young
  1225

Crater Saturation Equilibrium in the Solar System: New Evidence
W. K. Hartmann
  1226

Impact Strengths and Energy Partitioning in Impacts into Finite Solid Targets
W. K. Hartmann
  1227

Trojan Asteroids: A Unique Frontier in Space Research
W. K. Hartmann
  1228

A Summary of Data on the Manson Impact Structure
J. B. Hartung, R. R. Anderson
  1229

Thermoluminescence Evidence for a Terrestrial Age Difference Between Allan Hills and Lewis Cliff Meteorites
F. A. Hasan, D. W. G. Sears
  1230

Evaporation Kinetics of REE Oxides
A. Hashimoto
  1231

Limits from EU Mass Balance on the Proportions of KREEP and Ferroan Anorthosite in the Lunar Surface Crust
L. A. Haskin, R. L. Korotev
  1232

Remote Sensing Studies of the Cruger Region of the Moon
B. R. Hawke, C. R. Coombs, P. G. Lucey
  1233

Numerical Simulation of Planetary Accretion Process
M. Hayakawa, H. Mizutani
  1234

The Freyja Montes/North Polar Plains Boundary of Ishtar Terra: Evidence for Large-Scale Convergence and Crustal Imbrication
J. W. Head
  1235

Identification of Syntaxis Structures in the Venus Highlands (Ishtar Terra) and Their Possible Tectonic Significance
J. W. Head
  1236

Lateral Migration and Eruption of Magma in Volcanic Edifice Rift Zones: The Pu'u 'O'o Eruptions of the East Rift Zone of Kilauea Volcano, Hawaii
J. W. Head, L. Wilson
  1237

Regional Trends in Crater Density on Venus: Implications for Surface Processes
J. W. Head, L. S. Crumpler, S. Frank
  1238

The Nature of the Venus Equatorial Highlands and Their Global Significance
J. W. Head, L. S. Crumpler, P. C. Fisher
  1239

Early Resurfacing of Umbriel: Evidence from Voyager II Photometry
P. Helfenstein, J. Veverka
  1240

Physical Properties of Channels and Aeolian Features in the Oxia Palus and Margaritifer Sinus Quadrangles of Mars
L. Y. Henry, J. R. Zimbelman
  1241

Analysis of Gravity Data over Aphrodite Terra, Venus
R. R. Herrick, B. G. Bills
  1242

Pyroclast Sizes in Terrestrial and Martian Ignimbrites
S. E. Heslop, L. Wilson
  1243

Equilibration of Foreign Clasts in the Peckelsheim Diogenite
R. H. Hewins
  1244

Process Identification for Eucrites
R. H. Hewins
  1245

Luminescence of Experimentally Shocked Plagioclase Feldspar
D. Heymann
  1246

Carbon, Oxygen, Silicon, Sulphur, Calcium and Iron in Twenty-Four Clasts and One Dark Inclusion of the Allende Meteorite
D. Heymann, J. Makjanic, C. C. A. H. van der Stap, R. D. Vis, H. Verheul
  1247

Oblique Impact as the Source of the Australasian Tektites
A. R. Hildebrand
  1248

Buried Topography as a Controlling Factor in the Origin of the Giant Polygons of Mars
L. S. Hills
  1249

Isotopic Mass Fractionation of Potassium in the Moon
R. W. Hinton, R. N. Clayton, A. M. Davis, E. J. Olsen
  1250

Planetary Atmospheres During Accretion: The Effect of C-O-H-S Equilibria
J. R. Holloway
  1251

Surface Spall in Large Impact Events
K. A. Holsapple, K. Y. Choe
  1252

The Lunar Far Side Swirls: Distribution and Possible Origins
L. L. Hood, C. R. Williams
  1253

Martian Craters: Changes in the Diameter Range for Ejecta Fluidization with Latitude
V. M. Horner, N. G. Barlow
  1254

Scaling of Crater Ejecta Blocks
K. R. Housen
  1255

Scaling Problems in Catastrophic Collisions
K. R. Housen, K. A. Holsapple
  1256

In-Situ Measurement of the Surface Composition of the Mars Moon Phobos: The Alpha-X Experiment on the Phobos Mission
D. Hovestadt, B. Andreichikov, J. Bruckner, T. Economou, B. Klecker, E. Kunneth, P. Laeverenz, L. Mukhin, A. Prilutskii, V. Radchenko, C. REppin, R. Rjeder, R. Sagdeev, C.S. Sastri, A. Turkevich, V. Vasiliev, H. Wänke
  1257

A Least-Squares Method Used to Constrain Mixing Models of Hybridized Lunar Mare Basalt Magma Sources
S. S. Hughes, R. A. Schmitt
  1258

Chemistry of a Unique Low-Titanium Basalt Clast Extracted from 60255 Regolith Breccia
S. S. Hughes, R. A. Schmitt
  1259

Chemistry of 74220 Orange Mare Volcanic Glass; Implications for Their Magmatic Source Composition
S. S. Hughes, J. W. Delano, R. A. Schmitt
  1260

The Use of Remote Sensing and Electromagetic Sound Penetration in the Study of Fault Zones
J. J. Hurtak
  1261

Chondrule Sizes and Chemical Fractionations Among Chondrites May Have Both Resulted from Protosolar Eruptions
G. R. Huss
  1262

Evidence of the In-Situ Decay of 26Al in a Semarkona Chondrule
I. D. Hutcheon, R. Hutchison, G. J. Wasserburg
  1263

Dynamics of Submicron Lunar Ejecta in Selenocentric, Cislunar and Geocentric Space
T. W. Hyde, W. M. Alexander, S. Goad, R. McDonald
  1264

Calcium and Titanium Isotopic Systematics of Hibonites
T. R. Ireland, A. J. Fahey, E. K. Zinner
  1265

Iron Crystals in the Kaidun Meteorite: Process of New Type?
A. V. Ivanov, N. V. Khisina, N. N. Kononkova, L. V. Petushkova
  1266

Effect of Modification of Impact Craters on the Size-Frequency Distribution and Scaling Law
B. A. Ivanov
  1267

On the Breakup Diameter of Meteoroids in the Venusian Atmosphere
B. A. Ivanov
  1268

Simple Hydrodynamic Model of Atmospheric Breakup of Hypervelocity Projectiles
B. A. Ivanov
  1269

The Results of Morphometric Study of the Tessera Terrain of Venus from Venera 15/16 Data
M. A. Ivanov
  1270

A Solar System Dust Ring: The Earth as Its Shepherd
A. A. Jackson, H. A. Zook
  1271

Mars Atmospheric D/H: Consistent with Polar Volatile Theory?
B. M. Jakosky
  1272

Observational Constraints on the Efficacy of a Solid-State Greenhouse on the Galilean Satellites
B. M. Jakosky
  1273

Stability and Instability of the South Polar CAP on Mars
B. M. Jakosky, R. M. Haberle
  1274

Trace Elements in the Plagioclase of Lunar Ferroan Anorthosites
O. B. James
  1275

Meteorite Impact Crater on the North Atlantic Shelf
L. F. Jansa, G. Pe-Piper, B. Robertson, O. Friedenreich
  1276

Spectrophotometric Analysis of Lunar Surface Materials: A New Technique for the Quantitative Determination of Geochemical Components
R. Jaumann, L. Kamp, G. Neukum
  1277

Quantitative Determination of the Geochemical Composition of Lunar Surface Materials from Telescopic Reflectance Data
R. Jaumann, G. Neukum, B. R. Hawke
  1278

Mineral Chemistry and Petrology of Luna 16 Basalts: Sample 21036
Y. Jin, L. A. Taylor, F. Lu
  1279

Shock-Implanted Noble Gases in Samples from the Wabar Impact Crater: Implications for Other Terrestrial Craters and the Surface of Mars
P. H. Johnson, D. D. Bogard, F. Hoerz
  1280

Io: Leading Side Volcanism in 1986
T. V. Johnson, G. J. Veeder, D. L. Matson, R. H. Brown, R. M. Nelson, D. Morrison
  1281

Partitioning of MG and Fe Between Olivine and Liquids of Lunar Compositions: The Roles of Composition, Pressure and TI Speciation
J. H. Jones
  1282

Fractional Crystallization of the Lunar Magma Ocean, the Bulk Composition of the Moon, and Comparison to the Earth
J. H. Jones, J. W. Delano
  1283

The Mineralogy of Type IA Chondrules in Semarkona (LL3.0): Disentangling the Igneous and Metamorphic Histories of Type 3 Ordinary Chondrites
R. H. Jones, E. R. D. Scott
  1284

The 3-μm Hydrated Silicate Signature on C Class Asteroids: Implications for Origins of Outer Belt Objects
T. D. Jones, L. A. Lebofsky, J. S. Lewis
  1285

Festoon-like Migration Fronts of Mud and Debris in the Vicinity of Olympus Mons, Mars
H.-P. Jons
  1286

Hints for an Embryonic Stage of Underplating/Plate Tectonics on Mars?
H.-P. Jons
  1287

Surface and Near-Surface Thawing of Permafrost and/or Ground Ice on Mars
H.-P. Jons
  1288

New Ground-Based Radar Images of Venus
R. F. Jurgens, R. E. Arvidson, J. J. Plaut, R. S. Saunders, M. A. Slade
  1289

New Evidence for Highly Reflecting Materials on the Surface of Venus from High Resolution Ground-Based Radar Images
R. F. Jurgens, S. Brokl, C. Franck, G. A. Morris, L. L. Robinett, R. S. Saunders, M. A. Slade
  1290

Some Geochemical Aspects of Projectile Reconstruction
I. G. Kapustkina, V. I. Feldman
  1291

The Geology of Ariel, I: Trans-Tensional Block Tectonics
J. S. Kargel
  1292

Liquidus Phase Relations and Liquid Properties in the System H2O-NH3-CO2-H2CO
J. S. Kargel
  1293

Pu/U-Ratio on Fission Track Studies of Efremovka CV Chondrite CAIs
L. L. Kashkarov, A. V. Fisenko, A. K. Lavrukhina
  1294

Track and Thermoluminescence Dating of the Impact Glasses from Meteoritic Crater Zhamanshine
L. L. Kashkarov, L. I. Genaeva, V. G. Kashkarova, E. P. Izokh
  1295

Track and Thermoluminescence Studies of the Radiation and Thermal Histories for the Ordinary Chondrite Elenovka L5 Chondrules
L. L. Kashkarov, G. V. Kalinina, V. G. Kashkarova, G. V. Baryshnikova, A. K. Lavrukhina
  1296

Thermoluminescence of the Allende Chondrule Olivines with the Different Irradiation History
L. L. Kashkarov, N. N. Korotkova, V. G. Kashkarova
  1297

Thermal Effects on the Tectonics of Venus
W. M. Kaula
  1298

HRTEM Study of the Matrix Mineralogy of the Lance CO(3) Chondrite
L. P. Keller, P. R. Buseck
  1299

Studies of the Surface of PHOBOS from a Rover
A. L. Kemurdzhian, V. V. Gromov, P. S. Sologub, F. F. Surkov, Yu. A. Kirnozov
  1300

Deuterium in Shergotty and Lafayette (and on Mars?)
J. F. Kerridge
  1301

Mantle Plumes on Venus: A Model for the Equatorial Highlands and a Possible Connection with the Ovoids
W. S. Kiefer, B. H. Hager
  1302

MG Isotopic Composition of Chondrules from Bjurbole and Murchison Meteorites
A. E. Kinsey, T. M. Esat, S. R. Taylor
  1303

The Role of Differentiation in the Stress Histories of the Terrestrial Planets: Implications for the Moon and Mars
R. L. Kirk, D. J. Stevenson
  1304

Beryllium-10 and Aluminum-26 Contents of Lunar Rock 74275
J. Klein, R. Middleton, D. Fink, J. W. Dietrich, D. Aylmer, G. F. Herzog
  1305

Simulation of Cosmic-Ray Production of 26Al and 10Be
J. Klein, K. Nishiizumi, R. C. Reedy, P. Englert, R. Middleton
  1306

How Far Do Results of Recent Simulation Experiments Fit with Current Models of Cometary Nuclei?
J. Klinger, J. Benkhoff, S. Espinasse, E. Gruen, W. Ip, F. Joo, H. V. Keller, H. Kochan, H. Kohl, K. Roessler, W. Sebold, T. Spohn, K. Thiel
  1307

Unusual Mineral Chemistry of Extraterrestrial Dust Particles
W. Kloeck, K. L. Thomas, D. S. McKay
  1308

Preliminary Investigation of Geological Controls on Valleys Influenced by Groundwater Sapping, Southern Colorado Plateau, Arizona and Utah
R. C. Kochel, M. A. Phillips
  1309

Laboratory Simulation of a Cometary Nucleus: Experimental Setup and First Results
H. Kochan, A. Bischoff, H. Fechtig, B. Feuerbacher, E. Grun, F. Joo, J. Klinger, H. Kohl, D. Krankowsky, K. Roessler, W. Seboldt, K. Thiel, G. Schwehm, U. Weishaupt
  1310

Relationship of Congo and Indian Cratons to Anomalies of Geoid
G. G. Kochemasov
  1311

What in Common Between Grimaldi Crater (Moon), Cleopatra Crater (Venus) and St. Helena Island or Afar (Earth)?
G. G. Kochemasov
  1312

Extension of the North American Tektite Strewn Field
C. Koeberl
  1313

Chemical Composition and Morphology of Meteorite Ablation Spherules in Neogene Till in the Dominion Range, Transantarctic Mountains
C. Koeberl, E. Hagen, G. Faure
  1314

Fractionation of Refractory Metals by High Temperature Oxidation
A. V. Kohler, H. Palme, B. Spettel, B. Fegley
  1315

Fragments from Lunar Highland Regolith: Search for Magmatic Relatives
M. I. Korina, M. Ya. Frenkel
  1316

Geochemical Stratigraphy of the 79001/2 Core, Van Serg Crater, Apollo 17
R. L. Korotev
  1317

New Compositional Data for Regolith Samples from the South Massif and Light Mantle at Apollo 17
R. L. Korotev
  1318

Compositional Survey of Particles from the Luna 20 Regolith
R. L. Korotev, L. A. Haskin
  1319

Compositional Survey of Particles from the Luna 16 Regolith
R. L. Korotev, B. L. Jolliff, L. A. Haskin
  1320

Solar Flare Track Records in Nikol'skoe L4-5 Chondrite
N. N. Korotkova, A. Ya. Skripnik, A. K. Lavrukhina
  1321

Track Study of Bjurbole L4, Ochansk H4 and Nikol'skoe L4-5 Chondrite Olivines
N. N. Korotkova, A. Ya. Skripnik, A. K. Laurukhina
  1322

Stereoscopic Anaylsis of Venera SAR
R. C. Kozak, G. G. Schaber
  1323

LEW 85300,02,03 Polymict Eucrites Consortium--I: Petrology of Igneous Clasts
J. Kozul, R. H. Hewins
  1324

LEW 85300,02,03 Polymict Eucrites Consortium--II: Breccia Clasts, CM Inclusion, Glassy Matrix and Assembly History
J. Kozul, R. H. Hewins
  1325

Ridge Belts on the Plains of Venus. I.
V. P. Kryuchkov
  1326

The Feature Length and Spacing Comparison Among Ridge and Groove Belts, Coronae and Mountain Surrounding of Lakshmi. II.
V. P. Kryuchkov
  1327

Electron Probe and Ion Probe Determination of Melilite/Liquid and Clinopyroxene/Liquid Partition Coefficients of Trace Elements in CMAs and NaCMAS
S. M. Kuehner, J. R. Laughlin, L. Grossman, M. L. Johnson, D. S. Burnett
  1328

Inhomogeneities in the Upper Levels of the Martian Cryolithosphere
R. O. Kuzmin, N. N. Bobina, E. V. Zabalueva, V. P. Shashkina
  1329

Mars: Estimation of the Relative Ice Content in Upper Layers of the Permafrost
R. O. Kuzmin, N. N. Bobina, E. V. Zabalueva, V. P. Shashkina
  1330

Chondrules: Are they Fractals?
B. Lang, K. Franaszczuk
  1331

Rare Earth Elements in a Compound Group II Allende Inclusion
J. R. Laughlin, A. M. Davis, S. M. Kuehner, L. Grossman
  1332

Chemistry of Apollo 17 Highland Coarse Fines: Plutonic and Melt Rocks
J. C. Laul
  1333

Experimentally Produced Hypervelocity Impact Craters in Gold: Some Preliminary Results
M. R. Laurance
  1334

Trapped Xe in the Chondrite Forest Vale (H4)
B. Lavielle, K. Marti
  1335

Evidence for Extinct 248Cm in Meteorites?
B. Lavielle, K. Marti, P. Pellas
  1336

Origin of Chondrules
A. K. Lavrukhina
  1337

Specifics of the Composition of the Fe, Ni-Phase in the Chondrules of Chondrites of Different Chemical Groups
A. K. Lavrukhina, S. A. Stakheeva, Z. A. Lavrentjeva, K. I. Ignatenko
  1338

Development of the Prototype Atmospheres Node of the Planetary Data System
S. W. Lee, S. W. Lasater, R. L. Davis, C. A. Barth
  1339

Atmospheric Pressure Experimental Studies of a Low-Silica Martian Mantle Composition
L. A. Leshin, J. R. Holloway, C. M. Bertka
  1340

Xenon-HL in Diamonds from the Allende Meteorite--Composite Nature
R. S. Lewis, E. Anders
  1341

Highland Clasts in Apennine Front Breccia 15295
M. M. Lindstrom, U. B. Marvin, D. W. Mittlefehldt
  1342

Bombardment History of the Saturn System
J. J. Lissauer, S. W. Squyres, W. K. Hartmann
  1343

The Relative Nebular Locations for the Formation of Parental Components in the CV3 Chondrites Kaba, Mokoia and Allende
Y.-G. Liu, R. A. Schmitt
  1344

A Trace Element/Petrographic Study of Refractory Inclusions in Kaba (CV3)
Y.-G. Liu, R. A. Schmitt, B. A. Holmen, J. A. Wood, D. A. Kring
  1345

Dynamic Crystallization Experiments on Chondrule Melts of Porphyritic Olivine Composition: Comparison of Olivine Compositions from Natural and Experimentally Produced Chondrules
G. E. Lofgren, A. M. Reid
  1346

The Parental Magmas of the SNC Meteorites
J. Longhi, V. Pan
  1347

Widening of Lava Flow-Fields
R. M. C. Lopes-Gauiter, C. R. J. Kilburn
  1348

Identification and Effects of Large, Early Archean, Terrestrial Meteorite Impacts: A Geological Perspective on Late Accretion
D. R. Lowe, G. R. Byerly
  1349

Iridium Anomalies Associated with Early Archean Spherule Layers, South Africa and Western Australia
D. R. Lowe, F. Asaro, G. R. Byerly
  1350

Coarse-Grained Basic Igneous Samples from Mare Crisium: Mineralogy, Petrography, and Petrogenesis
F. Lu, L. A. Taylor, Y. Jin
  1351

Kasei Valles, Mars: Formed by Flood or Ice?
B. K. Lucchitta
  1352

Ganymede: "Moat" Craters Compared with Palimpsests and Basins
B. K. Lucchitta, H. M. Ferguson
  1353

Ground-Based Imaging Spectroscopy of the Moon: On the Threshold
P. G. Lucey
  1354

Thermal Evolution of Titan's Atmosphere
J. I. Lunine
  1355

A Two-Layer Hydrologic Model for the Impacted Martian Crust
D. J. MacKinnon, K. L. Tanaka
  1356

The Clay-Size Fraction of CI Chondrites Alais and Orgueil: an AEM Study
I. D. R. MacKinnon, S. A. Kaser
  1357

Colette and Sacajawea: Characterization, Comparison, and Interpretation of Major Caldera Structures on Lakshmi Planum
K. P. Magee, J. W. Head
  1358

Lakshmi Planum: A Distinctive Highland Volcanic Province
K. P. Magee, J. W. Head
  1359

Carbon Contents of High-Nickel Areas of the Toluca and Algarrobo Iron Meteorites
J. Makjanic, C. C. A. H. van der Stap, R. N. Vis, H. Verheul
  1360

Raman Spectroscopy of Some Glass Inclusions in Chondrules of Allende
J. Makjanic, R. D. Vis, J. L. R. Touret, H. Verheul
  1361

Computer Simulation of "Intact" Gravitational Capture of a Lunar-Like Body by an Earth-Like Body
R. J. Malcuit, D. M. Mehringer, R. R. Winters
  1362

Assimilation-Fractional Crystallization Modeling of Magmatic Iron Meteorites
D. J. Malvin
  1363

Crystal Structure and Density of Helium up to 232 Kbar
H. K. Mao, Y. Wu, A. P. Jephcoat, R. J. Helmey, P. M. Bell, W. A. Bassett
  1364

Low Level Remote Sensing to Directly Detect Antarctic Surficial Blue Ice Meteorites
A. A. Mardon
  1365

Is There an Invisible Mass Contained in the Solar System?
L. S. Marochnik, L. M. Mukhin
  1366

Accretionary Layers on Venusian Surface Rocks Produced by Aeolian Impact
J. R. Marshall, D. W. Tucker, R. Greeley, J. B. Pollack
  1367

Finds of Tektite Glasses in West Siberia
V. L. Masaitis, M. A. Ivanov, V. A. Ezersky, V. S. Kozlov, N. B. Reshetnyak
  1368

Recent Progress in the Study of MRSR (Mars Rover Sample Return) Candidate Landing Sites
H. Masursky, A. L. Dial Jr., M. E. Strobell, D. J. Applebee
  1369

Solid State Greenhouses: Approaches for Temperature Measurement
D. L. Matson, R. H. Brown
  1370

Noble Gas Enrichment in the Shock-Produced Diamond
J. Matsuda, K. Nagao
  1371

On the Vapor-Growth Diamonds Formation in the Solar Nebula
J. Matsuda, M. Miyamoto, K. Ito
  1372

Numerical Simulation of Planetary Ring Formation
T. Matsui, N. Namiki
  1373

A Possible Scenario for Atmospheric Evolution: Steam Atmosphere to Present One
T. Matsui, M. Ishiwatari, Y. Abe
  1374

Climate and Impact: Climatic Change on Mars Caused by Impact Basin Formation
T. Matsui, E. Tajika, Y. Abe
  1375

The "Blue Lake II" Expedition of July-August 1987 in Greenland, and the Search for mm-size Unmelted Extraterrestrial Particles
M. Maurette, C. Hammer, M. Pourchet, D. E. Brownlee
  1376

Origin of Monomineralic Layers in the Stillwater Complex
I. S. McCallum
  1377

Sources of Clasts in Impact Melts
K. McCormick, G. J. Taylor, K. Keil, P. D. Spudis, R. A. F. Grieve, G. Ryder
  1378

Diversity of Granulitic Breccia Clasts from Feldspathic Fragmental Breccia 67975
J. J. McGee
  1379

Evidence for a Very Large Basin Beneath Utopia Planitia, Mars
G. E. McGill
  1380

Origin of Zoned Allende Fine-Grained Inclusions
A. V. McGuire, A. Hashimoto
  1381

Barringer Crater Stishovite: Oxygen-18 Rich Relative to Bulk Target Rock
J. F. McHone, L. P. Knauth
  1382

Core 79001/2: an Example of Extreme Mixing in the Lunar Regolith
D. S. McKay, S. J. Wentworth, A. Basu
  1383

Experimental Studies of Synthetic LEW 86010 Analogs: Petrogenesis of a Unique Achondrite
G. McKay, D. Lindstrom, L. Le, S.-R. Yang
  1384

Petrology of Unique Achondrite Lewis Cliff 86010
G. McKay, D. Lindstrom, S.-R. Yang, J. Wagstaff
  1385

Pluto Structure and Composition: Evidence for a Solar Nebula Origin
W. B. McKinnon, S. Mueller
  1386

Crystallization of the ALHA77005 Shergottite: How Closed is a Closed System?
H. Y. McSween Jr., L. Lundberg, G. Crozaz
  1387

Digital Photomosaic of Viking Images 14A29-14A35: A Preliminary Look at Gangis Chasma, Mars
D. E. Melendrez, J. R. Zimbelman, P. W. Francis
  1388

The Identification of Lunar Rock Types Via Orbital Gamma Ray Spectroscopy
A. E. Metzger
  1389

Characteristics of Accretionary Dark Rims in Carbonaceous Chondrites
K. Metzler, A. Bischoff, D. Stoeffler
  1390

Tungsten-Bearing, Lunar "Yttrobetafite"
C. Meyer, S. R. Yang
  1391

Eucrite Pomozdino: Mineral Chemistry
L. F. Migdisova, N. N. Kononkova, N. I. Zaslavskaya
  1392

Impact Origin of the Calvin 28 Cryptoexplosive Disturbance, Cass County, Michigan
R. L. Milstein
  1393

Mineralogy of a Suite of Martian Analog Soils from Hawaii
D. W. Ming, R. V. Morris, R. P. Bernhard, J. B. Adams
  1394

Weak Shock Metamorphism in Basalts of the Logancha Astrobleme
Yu. V. Mironov, V. M. Ladyguin
  1395

Rare Earth Elements in Chondrules and CAI from the Felix (CO3) Chondrite
K. Misawa, N. Nakamura
  1396

Petrology of an Opx-Oliv Porphyritic Mg-Basalt Clast in Kapoeta
D. W. Mittlefehldt
  1397

Petrogenesis of the Mesosiderite Regolith
D. W. Mittlefehldt
  1398

Geochemistry of Diverse Lithologies in Antarctic Eucrites
D. W. Mittlefehldt, M. M. Lindstrom
  1399

Amorphous Impact Materials in the Planetary Surfaces
Y. Miura
  1400

Normal and Anomalous Compositions of Lunar Feldspars--I. Lunar Plagioclases
Y. Miura
  1401

Infrared Diffuse Reflectances of Some Hydrous Minerals: Absorption Bands Near 3 microns
M. Miyamoto
  1402

Raman Spectra of Ureilite Diamond and the Origin of Diamond in Meteorites
M. Miyamoto, J. Matsuda, K. Ito
  1403

Viking Landers and Remote Sensing
H. J. Moore, B. M. Jakosky
  1404

Rhenium and Osmium Isotope Systematics in Carbonaceous Chondrites
J. W. Morgan, R. J. Walker
  1405

Lunar Dunite 72415-72417: Siderophile and Volatile Trace Elements
J. W. Morgan, G. A. Wandless
  1406

Production of Sodium and Potassium Vapor from the Lunar Regolith
T. H. Morgan, H. A. Zook, A. E. Potter
  1407

TEM Observation of Carbonaceous Material in the Dyalpur Ureilite
H. Mori, H. Takeda
  1408

Oxygen Isotopes of Chromite and Chemical Composition of the Minerals from Polymineral Nodules in Sikhote-Alin Meteorite
L. V. Moroz, V. I. Ustinov, N. N. Kononkova, N. I. Zaslavskaya, Yu. A. Shukolyukov
  1409

Effect of Aluminum Substitution on Visible and Near-IR-Optical Properties of Hematite with Implications for Martian Spectral Data
R. V. Morris, H. V. Lauer Jr.
  1410

Mossbauer Mineralogy of a Martian Spectral Analogue (Hawaii 34): Implications for the Iron Oxide Pigment of Mars
R. V. Morris, D. G. Agresti, T. D. Shelfer, J. B. Adams
  1411

Precursor of the Wabar Crater Glasses?
A. V. Murali, T. H. See, D. P. Blanchard
  1412

Formation of Libyan Desert Glass
A. V. Murali, M. E. Zolensky, J. R. Underwood, R. F. Giegengack
  1413

The Evolution of Volcanism on Ganymede: Possible Importance of a Low Melting-Point Volatile
S. L. Murchie, J. W. Head
  1414

Crater-Densities and Crater-Ages of Different Terrain Types on Ganymede
S. L. Murchie, J. W. Head, J. B. Plescia
  1415

Tectonic and Volcanic Evolution of Dark Terrain and Its Implications for Internal Structure and Evolution of Ganymede
S. L. Murchie, J. W. Head, J. B. Plescia
  1416

Predicting Mineral Abundances from Reflectance Spectra
J. F. Mustard, C. M. Pieters
  1417

Sub-Micron Inclusions in Diamonds--Samples of Pristine Upper Mantle Fluids?
O. Navon, I. D. Hutcheon, G. R. Rossman, G. J. Wasserburg
  1418

Comparison of Lunar and Terrestrial Granites: A Unique Petrogenesis for the Lunar Occurrence
C. R. Neal, L. A. Taylor
  1419

"K-Frac + REEP-Frac": A New Understanding of KREEP in Terms of Granite and Phosphate Petrogenesis
C. R. Neal, L. A. Taylor
  1420

The Origin of Phosphate in the Fra Mauro Highlands by Silicate Liquid Immiscibility: Part of the Basic Melt Produced in Lunar Granite Petrogenesis?
C. R. Neal, L. A. Taylor
  1421

Basalts from Apollo 14 Breccia 14321: Part 1--Mineralogy and Petrology
C. R. Neal, L. A. Taylor, A. D. Patchen
  1422

Evidence for REE Metasomatism of the Apollo 14 Highlands Crust
C. R. Neal, L. A. Taylor, A. D. Patchen, M. M. Lindstrom
  1423

A Re-Evaluation of Olivine Vitrophyre Petrogenesis
C. R. Neal, L. A. Taylor, R. A. Schmitt
  1424

Basalts from Apollo 14 Breccia 14321: Part 2--Geochemistry
C. R. Neal, L. A. Taylor, R. A. Schmitt, S. S. Hughes
  1425

VHK Basalt Petrogenesis: Further Evidence from Breccias 14303 and 14304
C. R. Neal, L. A. Taylor, R. A. Schmitt, S. S. Hughes, M. M. Lindstrom
  1426

Planetary Ices at High Dynamic Pressures and Temperatures and the Magnetic Field of Uranus
W. J. Nellis, D. C. Hamilton, N. C. Holmes, H. B. Radousky, F. H. Ree, A. C. Mitchell, M. Nicol
  1427

Application of Radiative Transfer Theory to the Spectra of Mineral Mixtures
M. L. Nelson, R. N. Clark
  1428

Further Studies of the Hydrous Alteration and Oxygen Isotopic Fractionation of Refractory Condensates
R. N. Nelson, S. K. Bhattacharya, M. H. Thiemens, J. A. Nuth
  1429

The Cratering Rate in the Earth-Moon System over the Past 3.10 Years and in recent time
G. Neukum
  1430

Mars Sample Return and Cratering Chronology Models: Consequences for the Martian History and Site Selection
G. Neukum, R. Greeley
  1431

The Geochemistry of the Impactor in the Impact Hypothesis for the Origin of the Moon
H. E. Newsom
  1432

Ammonia-Water Mixtures at High Pressures: Applications to Icy Satellites
M. Nicol, S. Boone, A. Koumvakalis, H. Cynn
  1433

Helium and Neon in Individual Extraterrestrial Particles
A. O. Nier, D. J. Schlutter, D. E. Brownlee
  1434

Tectonic and Magmatic Models for the Origin of Cleopatra Patera, Maxwell Montes, Venus
A. M. Nikishin, L. S. Crumpler
  1435

Comet Nucleus Matter: Some Predictions
O. V. Nikolaeva
  1436

Are Tesserae the Outcrops of Feldspathic Crust on Venus?
O. V. Nikolaeva, A. A. Pronin, A. T. Basilevsky, M. A. Ivanov, M. A. Kreslavsky
  1437

Cosmogenic 36 CL Production Rates in Meteorites and the Lunar Surface
K. Nishiizumi, P. W. Kubik, D. Elmore, R. C. Reedy, J. R. Arnold
  1438

Chondrule Cores and Rims from the Tieschitz (H3.6) Chondrite
S. Noda, H. Nagamoto, Y. Nishikawa, K. Misawa, N. Nakamura
  1439

Khor Temiki: an Enstatite Achondrite with Evidence of Mixing of Metal and Sulfides from Separate Sources
Th. Ntaflos, K. Keil, H. E. Newson
  1440

Proton Irradiation of SiH4-Fe(CO)5-H2O Ices and the Production of Refractory Silicates: Implications for the Solar Nebula
J. A. Nuth, M. H. Moore
  1441

Tectonic Episodes on Ariel: Evidence for an Ancient Thin Crust
P. A. Nyffenegger, G. J. Consolmagno
  1442

Isotopic Studies of Shock Metamorphism: II. Sm-Nd
L. E. Nyquist, B. M. Bansal, H. Wiesmann, C.-Y. Shih, F. Hoerz
  1443

Rb-Sr Age of the Large Mare Basalt Clast in Breccia 15459
L. E. Nyquist, H. Wiesmann, B. Bansal, C.-Y. Shih
  1444

A Monte Carlo Simulation of the Diurnal Variation in Seismic Detection Rate of Sporadic Lunar Meteoroid Impacts
J. Oberst, Y. Nakamura
  1445

Lechatelierite in Moldavites
J. A. O'Keefe
  1446

Impact Produced Condensate and Droplet Size Distributions
J. D. O'Keefe, T. J. Ahrens
  1447

Impact Production of CO2 by the K-T Extinction Bolide, and the Resultant Heating of the Whole Earth
J. D. O'Keefe, T. J. Ahrens
  1448

Large Scale Impact on the Earth with an Atmosphere
J. D. O'Keefe, T. J. Ahrens
  1449

Laser Extraction of Cosmogenic Neon from Microgram Size Grains
C. T. Olinger, D. H. Garrison, C. M. Hohenberg
  1450

Investigating the C.I.A.
E. J. Olsen, K. Fredriksson, S. Rajan
  1451

Siderophile Abundance Maxima at Upper Cenomanian Marine Invertebrate Extinction Horizon: Western Interior of North America
C. J. Orth, M. Attrep Jr., L. R. Quintana, R. Diner, W. P. Elder
  1452

S-Process KR and 22Ne in Murchison: A Correlation
U. Ott, F. Begemann, J. Yang, S. Epstein
  1453

CV-Chondrites: High Temperature Gas-Solid Equilibrium vs. Parent Body Metamorphism
H. Palme, D. A. Wark
  1454

Correlated, Large Isotope Effects in Purple, Spinel-rich Inclusions
D. A. Papanastassiou, C. A. Brigham
  1455

Lunar Pyroxenes: Crystal Chemical Rationalization of REE Zoning, Pattern Shapes, and Abundances--An Ion Microprobe Investigation
J. J. Papike, C. K. Shearer, S. B. Simon, N. Shimizu
  1456

Episodic Magma Motion in Shield Volcano Rift Zones
E. A. Parfitt, L. Wilson
  1457

Origin of Martian Plains
T. J. Parker, R. S. Squnders
  1458

Buoyancy and Extension in Rifting: Implications for the Along-Axis Distribution of Volcanism
E. M. Parmentier
  1459

Simple and Not-So-Simple Mixing in the Howardite-Eucrite-Diogenite (HED) Parent Body (4 Vesta)
R. L. Paul, R. O. Sack, H. Kruse, M. E. Lipschutz
  1460

Formation of Stony-Iron Meteorites: Laboratory Simulations
B. Pavri, R. Greenberg, C. L. Broadhurst, M. J. Drake
  1461

T-Tauri irradition of Kapoeta Grains?
A. Pedroni, H. Baur, R. Wieler, P. Signer
  1462

Thermalis to Ordinary Chondrites Parent Asteroids
P. Pellas, C. Fieni
  1463

Oxygen Isotopes in Pomozdino Meteorite
M. I. Petaev, V. I. Ustinov, N. I. Zaslavkaya, E. Y. Gavrilov, A. Shukolyukov
  1464

Formation of Sulci, Grooves and Associated Stress Regimes on Ganymede
R. Philpott
  1465

Geological, Chronological and Structural Mapping of Ganymede
R. Philpott
  1466

The Tectonic History of Ganymede
R. Philpott
  1467

Construction of Digital and Photomosaics of Ganymede
R. Philpott, V. Moore, D. A. Godfrey, N. Baker
  1468

Lithium Abundances in Natural Diamonds: an Exploratory, Ion-Microprobe Study
D. Phinney
  1469

Terrestrial Impact Cratering Record Revisited by Vector Fourier Analysis
E. Pierazzo, S. M. Sartori, V. Vanzani
  1470

Morphology of Lava Flows at Alba Patera
D. Pieri, D. Schneeberger
  1471

Millimeter Petrology and Kilometer Mineralogical Exploration
C. M. Pieters, G. J. Taylor
  1472

Water on the Moon? Potential Detection of Recent Cometary Impacts in the Earth/Moon Environment Using LGO/VIMS
C. M. Pieters, P. M. Hill, K. P. Magee, J. M. Sunshine
  1473

The Lenghts of Lava Flows
H. Pinkerton, L. Wilson
  1474

Vertical Relief of Martian Wrinkle Ridges: Implications for Internal Structure
J. B. Plescia
  1475

CA Isotopic Anomalies in Murchison Hibonites Observed by Thermal Emission Spectrometry
F. A. Podosek, J. C. Brannon
  1476

Effects of Epochal vs. Episodic Release of SO2 by Volcanoes on Mars
S. E. Postawko, F. P. Fanale, A. P. Zent
  1477

PB Isotopes in Anorthositic Breccias 67075 and 62237: A Search for Primitive Lunar Lead
W. R. Premo, M. Tatsumoto, J. W. Wang
  1478

Feldspathic Components in Polymict Ureilities
M. Prinz, M. K. Weisberg, C. E. Nehru
  1479

LEW 86010, A Second Angrite: Relationship to CAl's and Opaque Matrix
M. Prinz, M. K. Weisberg, C. E. Nehru
  1480

Calcium Isotope Disequilibrium in Allende Inclusion HN-3
C. A. Prombo, G. W. Lugmair
  1481

Coronae on Venus: Morphology and Origin
A. A. Pronin, E. R. Stofan
  1482

Propogating Rifts on Venus?
A. A. Pronin, A. L. Sukhanov
  1483

Titanium Carbide and Titania Phases in Particles of Probable Extraterrestrial Origin, Found Within Old Antarctic Ice
A. Pun, M. E. Zolensky, K. L. Thomas
  1484

Comments on the Symmetry Properties of Planetary Magnetic Fields
K. H. Radler, N. F. Ness
  1485

The Double Caldera of Alba Patera on Mars
J. Raitala, K. Kauhanen
  1486

Volcanic Vents of Alba Patera on Mars
J. Raitala, K. Kauhanen
  1487

Solar Flare Tracks and Neutron Capture Effects in Gas-rich Meteorites
R. S. Rajan, G. W. Lugmair
  1488

Neutron Production by Cosmic Rays: Dependence on Proton Energy and Spectra
R. C. Reedy
  1489

Multispectral Photometric Classification and Mapping of the Martian Surface in the Oxia Palus Region
P. Regner, L. Kamp, G. Neukum
  1490

Shock Experiments with Preheated Witwatersrand Quartzite and the Vredefort Microdeformation Controversy
W. U. Reimold
  1491

The Roter Kamm Crater Structure in SWA/Namibia
W. U. Reimold, R. Mcg. Miller, R. A. F. Grieve, C. Koeberl
  1492

Raman Spectra of Impact Glasses and Tektites
N. B. Reshetnyak, A. I. Raikhlin
  1493

Lower Maja Valles
J. W. Rice, S. M. Archibald, R. A. de Hon
  1494

Preliminary Analytical Electron Microscope (AEM) Results of Natural "Graphite" Shocked at 20.7, 31.4, 40.4 and 59.1 GPa
F. J. M. Rietmeijer
  1495

A Quantitative Comparison of Fine-Grained Chondritic Interplanetary Dust and Comet Halley Dust
F. J. M. Rietmeijer
  1496

Lunar Origin: Single Giant Impact or Multiple Large Impacts?
A. E. Ringwood
  1497

Lunar Siderophile Signature and its Genetic Significance
A. E. Ringwood, S. Seifert
  1498

Mapping of Ophiolitic Melanges of the Wadi Ghadir Area, Nubian Shield of Egypt Using a Linear Mixing Model Applied to Landsat Thematic Mapper Data
B. Rivard, R. E. Arvidson, M. Sultan, B. El Kaliouby
  1499

A Non Mass Dependent Isotopic Fractionation effect: A Hydrogen-Deuterium Exchange Experiment
F. Robert, J. Halbout
  1500

Aerial Photography and Geologic Studies of Impact Structures in Australia
D. J. Roddy, E. M. Shoemaker, C. S. Shoemaker, J. K. Roddy
  1501

The Creation of Maps of the Density Distribution of Lunar Craters
Zh. F. Rodionova, V. V. Shevchenko, A. A. Karlov, T. P. Smolyakova
  1502

High Energy and Radiation Chemistry in Space
K. Roessler, B. Nebeling
  1503

Cometary Matter in Observation and Simulation Experiments
K. Roessler, A. Bischoff, G. Eich, E. Grun, H. Fechtig, F. Joo, J. Klinger, H. Kochan, D. Stoeffer, K. Thiel
  1504

Evidence for Multiple Extraterrestial Impacts at the Cretaceous-Tertiary Transition in Israel
A. Rosenfeld, A. Flexer, A. Almogi-Labin, A. Honigstein, M. Dvorachek
  1505

Fine-Scale Cryptic Layering in the Peridotite Member of the Stillwater Complex, Montana
D. K. Ross, D. Elthon
  1506

Coupled Thermal-Dynamic Evolution of the Earth-Moon System
M. N. Ross, G. Schubert
  1507

Viscoelastic Models of Tidal Heating in Enceladus
M. N. Ross, G. Schubert
  1508

Basaltic and Gabbroic Clasts in Mesosiderites: Implications for Pervasive Impact-Melting on the Mesosiderite Parent Body
A. E. Rubin, E. A. Jerde
  1509

Chondrules and Matrix in the Sharps H3.4 Chondrite
A. E. Rubin, E. Pernicka
  1510

The Geology of Ariel
A. Ruzicka
  1511

Limited Chemical Variation of Apollo 15 KREEP Basalts
G. Ryder
  1512

A New Variant of High-Ti Mare Basalt from Van Serg Drive Tube 79001
G. Ryder
  1513

A Quantitative Petrographic View of Lunar Chondrules and Chondrule-like Objects
J. C. Sadow
  1514

Shock Metamorphism of Ilmenite in Janisjarvi Astrobleme (Kerelia, USSR)
L. V. Sazonova
  1515

Diaplectic Transformation of Dark-Colored Minerals
L. V. Sazonova, V. I. Feldman
  1516

Thermal Infrared (8-to 14-μm) Spectroscopic Remote Sensing of Rock Type on Particulate Planetary Surfaces
J. W. Salisbury, L. S. Walter
  1517

Elevations of Venusian Shields as Indicators of Lithospheric Thickness
G. G. Schaber
  1518

Large-Amplitude Photometric Variations of Nereid
M. W. Schaefer, B. E. Schaefer
  1519

Simple-to-Complex Crater Transition Diameters on the Icy Satellites of Uranus and Saturn
P. M. Schenk
  1520

Crater Depth/Diameters on Uranium and Saturnian Satellites: The Frictional Strength of Ice
P. M. Schenk
  1521

Impact-Generated Stress Waves and Spall in Water
R. M. Schmidt, H. E. Watson
  1522

The Elemental Composition of Interplanetary Dust
L. S. Schramm, D. E. Brownlee, M. M. Wheelock
  1523

Redox Speciation of Iron, Sulfur, and Oxygen in a Model Basaltic Magma
H. D. Schreiber, S. J. Kozak, K. K. McManus, D. Janjic
  1524

Atmospheric Effects on Impact Cratering Efficiency
P. H. Schultz
  1525

Impact Vaporization of Volatile-rich Targets; Experimental Results and Implications
P. H. Schultz
  1526

A New Petrochemical Data Base of Apollo 15 Olivine-Normative Mare Basalts
B. C. Schuraytz, G. Ryder
  1527

Thematic Maps of Antarctic Meteorites
J. Schutt, B. W. Fessler, W. A. Cassidy
  1528

Preliminary Description of Drive Tube 15009
C. Schwarz
  1529

Mars Sample Return: A General Philosophy for Site Selection
D. H. Scott
  1530

An Unusual Martian Channel
D. H. Scott
  1531

A New Kind of Primitive Chondrite: Allan Hills 85085
E. R. D. Scott
  1532

Alteration History of Chondrules in the Semarkona Ordinary Chondrite
D. W. G. Sears, A. D. Morse, R. Hutchison, R. K. Guimon, C. O. Alexander, I. P. Wright, C. T. Pillinger
  1533

Two Types of Impact Melt from the Wabar Crater, Saudi Arabia
T. H. See, F. Hoerz, A. V. Murali
  1534

The Search for Jeptha Knob Iridum, Continued
C. R. Seeger, F. Asaro, H. Michel, A. V. Noland
  1535

Modal Mineralogy and Major Element Chemistry of Luna 16 Basalt Rocks
A. S. Semenova, M. A. Nazarov, N. N. Kononkova, N. V. Soloveva
  1536

Formation Age of the Lonar Crater
D. Sengupta, N. Bhandari
  1537

Classification and Distribution of Volcanic Structures and Deposits in the Equatorial Region of Venus
D. A. Senske, J. W. Head
  1538

Gravity Anomalies on Venus and Their Relation to Geologic Structures
D. A. Senske, J. W. Head
  1539

Is the Bee Bluff Structure in S. Texas an Impact Crater?
V. L. Sharpton, D. C. Nielsen
  1540

Boron in Chondritic Meteorites
D. M. Shaw, M. D. Higgins, M. G. Truscott, T. A. Middleton, R. W. Hinton
  1541

Heterogeneity in Small Aliquots of Apollo 15 Olivine Normative Basalt: Implications for Breccia Clast Studies
J. W. Shervais, S. K. Vetter, M. M. Lindstrom
  1542

An Ion Microprobe Study of the Intra-Crystalline Behavior of REE and Selected Trace Elements in Pyroxenes from Mare Basalts with Different Cooling and Crystallization Histories, Preliminary Results
C. K. Shearer, J. J. Papike, S. B. Simon, N. Shimizu
  1543

An Ion Microprobe Study of the Intra-Crystalline Behavior of REE in Pyroxene from KREEP Basalts
C. K. Shearer, J. J. Papike, S. B. Simon, N. Shimizu
  1544

Plagioclase-Olivine Inclusions in Allende--A Link Between CAI and Ferro-Magnesian Chondrules
Y. J. Sheng, I. D. Hutcheon, G. J. Wasserburg
  1545

The Palomar Asteroid and Comet Survey (PACS), 1982-1987
C. S. Shoemaker, E. M. Shoemaker
  1546

Impact Structures of Australia (1987)
E. M. Shoemaker, C. S. Shoemaker
  1547

The Boxhole Meteorite Crater, Northern Territory, Australia
E. M. Shoemaker, D. J. Roddy, C. S. Shoemaker, J. K. Roddy
  1548

Petrology of Apollo 17 Highland Coarse Fines
S. B. Simon, K. C. Galbreath, J. J. Papike
  1549

Apollo 14 Regolith Breccias and Soils: Comparative Petrology and Chemistry
S. B. Simon, J. J. Papike, S. S. Hughes, R. A. Schmitt, J. C. Laul
  1550

An Independent Assessment of Derivative Analysis of Reflectance Spectra
R. B. Singer, P. E. Geissler
  1551

Correlation of Pioneer Venus Orbiter Gravity Data with Venera 15 and 16 SAR Imaging
W. L. Sjogren
  1552

Accretion Structures--I: Their Relicts in Chondrites and Chondrule Formation Model
Ya. A. Skripnik
  1553

Accretion Structures--II: Constitution of Different Types of Meteorites and Implications for their Origins
Ya. A. Skripnik
  1554

Venus Spin Vector: 1980-82 Goldstone Radar Additions
M. A. Slade, S. Zohar, R. F. Jurgens
  1555

Distribution of Small Domes on Venus: Venera 15/16 Radar Data
E. N. Slyuta, O. V. Nikolaeva, M. A. Kreslavsky
  1556

Telescopic Spectra of Mars Linked to Viking Lander Multispectral Images and Laboratory Analogs
M. O. Smith, J. B. Adams
  1557

Thin-Skinned Gravity-Driven Deformation on Venus
S. E. Smrekar, R. J. Phillips
  1558

Mossbauer Spectra of Weathered Stony Meteorites Relevant to Oxidation on Mars: I. Chondrites
T. C. Solberg, R. G. Burns
  1559

Longevity of Impact-Induced Faults as Preferred Sites for Later Tectonic Activity: A Further Terrestrial Test
S. C. Solomon, L. Meinke
  1560

Internal Dynamics of a Differentiated Ganymede: Constraints from Experimental Data
C. Sotin, S. L. Murchie
  1561

Terrestrial Spreading Centers Under Venus Conditions: Effects on Thermal Structure and Crustal Thickness
C. Sotin, J. W. Head, E. M. Parmentier
  1562

Ion Microprobe Search for the LREE Host Phase in Ureilite Meteorites
A. H. Spitz, C. A. Goodrich, G. Crozaz, L. Lundberg
  1563

The Fe-Al Relation of Lunar Soils and Orbital Chemical Data: Implications for AL Abundances Estimated from Apollo Orbital Gamma-Ray Data
P. D. Spudis, P. A. Davis, B. Pattanaborwornsak
  1564

Geology and Deposits of the Lunar Nectaris Basin
P. D. Spudis, B. R. Hawke, P. G. Lucey
  1565

Rb-Sr and Sm-Nd Evidence for the Origin of Late Eocene Microtektites
O. Stecher, H. H. Ngo, D. A. Papanastassiou, G. J. Wasserburg
  1566

Minor Elements in Forsterite of Cumberland Falls Enstatite Achondrite
I. M. Steele
  1567

Minor Elements and Cathodoluminescence of Enstatite in Cumberland Falls Enstatite Achondrite
I. M. Steele
  1568

Chemical Heterogeneity and Imperfect Mixing of the Gas Phase in the Solar Nebula
D. J. Stevenson
  1569

Which Impact Origin of the Moon?
D. J. Stevenson
  1570

Arachnoid Structures on Venus: Morphology and Distribution
E. R. Stofan, J. W. Head
  1571

Corona Structures on Venus: Evidence for a Diapiric Origin
E. R. Stofan, J. W. Head, E. M. Parmentier
  1572

Nitrogen Isotopes in the Lunar Regolith; Results from Double Drive Tube 79002/79001
J. Stone, R. N. Clayton
  1573

Impacts on Comet Nuclei
P. J. Stooke
  1574

Venus: Geologic Mapping from Goldstone Images
P. J. Stooke
  1575

Non-Ideal Thermal Behavior of Mars: Observations, Models, and Interpretations
E. L. Strickland III
  1576

Thermal Properties of Martian Surface Material Analogs: Another Look
E. L. Strickland III
  1577

Implications for the Origin of the Objects Responsible for the Period of Late Heavy Bombardment from the Terrestrial Planet Cratering Record
R. G. Strom
  1578

Dispersed Spreading on Venus?
A. L. Sukhanov
  1579

Venus: The Case for the Jumping Spreading
A. L. Sukhanov
  1580

Spreading Features on Venus
A. L. Sukhanov, A. A. Pronin
  1581

Comparison of Aeolian Surface Roughness Measured in a Field Experiment and in a Wind Tunnel Simulation
R. Sullivan, R. Greeley
  1582

Gaussian Analysis of Pyroxene Reflectance Spectra
J. M. Sunshine, C. M. Pieters, S. F. Pratt
  1583

Remote Gamma-Spectrometry of Mars and PHOBOS
Yu. A. Surkov, L. P. Moskaleva, O. S. Manvelyan, V. P. Kharyukova
  1584

Micrometeorite Component of Halogens and Sulfur in the Lower Stratosphere
S. R. Sutton, G. J. Flynn
  1585

Nitrogen in the Earth: Development of the 14N(d,o)12C Microprobe Technique: Initial Results on Upper Mantle Micas
S. R. Sutton, J. V. Smith, K. W. Jones, J. B. Dawson
  1586

Geochemistry of Individual Volcanic Particles from Two Antarctic Tephras
S. R. Sutton, I. M. Steele, J. V. Smith
  1587

Lunar Polar Ice--A Reappraisal
T. Svitek, B. C. Murray
  1588

Geology of North-Central Tempe Terra, Mars
G. A. Swann
  1589

Toward a Classification of Lunar Sinuous Rilles
G. A. Swann
  1590

Iodine-Xenon and Petrographic Studies of Semkarkona Chondrules
T. D. Swindle, J. N. Grossman, D. H. Garrison, C. T. Olinger
  1591

Crystallographic Investigations of Calcic Plagioclase from the Bad Vermilion Lake Anorthosite Complex, Ontario
T. Tagai, J. Ichikawa, H. Takeda, D. A. Morrison
  1592

Ablation Rates of Falling Meteorites in the Terrestrial Atmosphere
Y. Takagi, H. Mizutani
  1593

Mineralogical Studies of Lunar Highland Breccia 67016, an Analog of the Yamato-82 Lunar Meteorites
H. Takeda, M. Miyamoto
  1594

Mineralogy of Magnesian and Calcic Groups of Ureilites and Formation Condition of Ureilites
H. Takeda, H. Mori, H. Ogata
  1595

Chaotic Material and Debris Flows in the Simud-Tiu Valles Outflow System of Mars
K. L. Tanaka
  1596

Noble Gases, C. N and SI Isotopes in Interstellar Sic from the Murchison Carbonaceous Chondrite
M. Tang, E. Anders, E. Zinner
  1597

Mare Basalts from the Highland Region: Petrochemical Varieties and Geochemical Features (Luna 20)
L. S. Tarasov, A. F. Kudryashova, V. A. Bobrov, E. G. Vertman, A. F. Sudyko, J. G. Shipizin
  1598

High-Titanium and Other Basalt Types from Taurus-Littrow Region (Mare Serenitatis)
L. S. Tarasov, A. F. Kudryashova, A. Mashtalka, J. Frana, G. M. Kolesov
  1599

PB Isotopic Evolution in the Moon and Earth; Inference from U-Th-Pb Partitioning in Basalt-Forming Minerals
M. Tatsumoto, J. W. Wang, W. R. Premo, J. A. Philpotts, H. Fujimaki
  1600

Magmatism and Impact on the Aubrite Parent Body: Evidence from the Norton County Enstatite Achondrite
G. J. Taylor, K. Keil, H. Newsom, A. Okada
  1601

SMIRR Data Analysis of West Texas: Enhancement of Lithologic Signatures
J. R. Tellez, J. L. Whitford-Stark
  1602

Determination of Osmium Isotopes and Re/Os Ratios in Iron Meteorites Using Accelerator Mass Spectrometry
R. T. D. Teng, U. Fehn, D. Elmore, P. W. Kubik, T. Hemmick, H. E. Gove
  1603

Radar Backscatter of Lava Flows as a Function of Incidence Angle
E. Theilig, R. S. Saunders
  1604

The Single-Stage, Mass Independent Fractionation Factor in Ozone
M. H. Thiemens, T. Jackson
  1605

On the Relaxation of Herschel Basin and Mimas Tidal Bulge
P. J. Thomas, S. W. Squyres
  1606

Ultra-High Resolution Radar Mapping of the Moon at 70 CM Wavelength
T. W. Thompson
  1607

Model for Mars Depolarized Radar Echoes
T. W. Thompson, H. J. Moore
  1608

Transmission Electron Microscopy of the Orgueil CI Carbonaceous Chondrite
K. Tomeoka, P. R. Buseck
  1609

Angra DOS Reis Is Not a Cumulate Igneous Rock
A. H. Treiman
  1610

Intact Capture of Hypervelocity Micrometeoroid Analogs
P. Tsou, D. E. Brownlee, M. R. Laurance, L. Hrubesh, A. L. Albee
  1611

A Heat-Pipe Mechanism for Volcanism and Tectonics on Venus
D. L. Turcotte
  1612

Impact-Induced Devolatilization and Hydrogen Isotopic Fractionation of Swepentine: Possible Implications for Planetary Accretion
J. A. Tyburczy, R. V. Krishnamurthy, S. Epstein, T. J. Ahrens
  1613

Gravitational Focussing During Planetary Encounters
G. B. Valsecchi, A. Carusi, R. Greenberg
  1614

Analysis of Zodiacal Light Data Based on a Finite Homogeneous Dust Cloud
M. H. H. van Dijk, P. B. Bosma, J. W. Hovenier
  1615

Glasses and a "HASP"-Mimicking Mineral or Mineral Intergrowth in Apollo 14 Regolith Breccias
D. T. Vaniman, G. Heiken, P. Warren, E. Jerde
  1616

Improved Thermal Models for Solid Planetary Bodies
K. J. Vogler, P. E. Johnson, R. W. Shorthill
  1617

Large-Scale Lateral Movement and Convergence of Crustal Material on Venus: Evidence from Maxwell Montes and Fortuna Tessera
R. W. Vorder Bruegge, J. W. Head
  1618

Topography of Geomorphic-Tectonic Units in Fortuna Tessera, Venus: Evidence of Crustal Thickening and Deformation
R. W. Vorder Bruggle, J. W. Head
  1619

The Bohemian Moldavite Strewnfield: Accumulation and Conservation of the Rise-Related Tektites in the Erosional Cavity of the Sevetin Impact Structure
S. Vrana
  1620

Simulation of the Magellan (Venus) SAR's Ability to Classify Volcanic Units
S. D. Wall, E. Theilig, R. S. Saunder
  1621

Small Compact CAI's: Collisional Splash Droplets?
D. A. Wark
  1622

MO and W Anomalies in CAI's: Sign of High Temperature Condensation, or Subsolidus Alteration?
D. A. Wark, H. Palme
  1623

Rim Formation by Flash Heating and Metasomatism: Evidence from Vigarano CAI VI-1
D. A. Wark, B. Spettel, H. Palme, A. El Goresy
  1624

Optical Observations of Impact Features on Solar Max Thermal Blankets and Louvers
J. Warren, H. A. Zook, J. Allton
  1625

Pomozdino: an Anomalous, Magnesian yet REE-rich, Eucrite
P. H. Warren, E. A. Jerde
  1626

Lunar Meteorites: Constraints on Lunar Composition and Evolution
P. H. Warren, G. W. Kallemeyn
  1627

A New Model for Ureilite Origin: Incomplete Impact-Disruption of Partially Molten Asteroids
P. H. Warren, G. W. Kallemeyn
  1628

A Non-Nebular Origin for the Allan Hills 85085 Subchondritic Meteorite
J. T. Wasson
  1629

The Continuous Redox Fractionation Sequence Among Ordinary Chondrites
J. T. Wasson, G. W. Kallemeyn, A. E. Rubin, D. Wang
  1630

Strain Distribution in the Anticlinal Ridges of the Columbia Plateau: Implications for Their Origin and the Origin of First-Order Ridges on the Terrestrial Planets
T. R. Watters
  1631

The Wrinkle Ridge Assemblage
T. R. Watters
  1632

Mare-Ridge--Highland Scarp Structures and Upland Scarps on the Moon, Mars and Mercury
T. R. Watters, M. J. Tuttle, J. Chadwick
  1633

Formation of Organic Cometary Dust by Ion Bombardment of Cosmic Ices
T. J. Wdowiak, E. L. Robinson, L. D. Brasher, G. C. Flickinger, H. R. Setze
  1634

Stirring of a Planetesimal Swarm by Distant Encounters
S. J. Weidenschilling
  1635

Dust to Dust: Low-Velocity Impacts of Fragile Projectiles
S. J. Weidenschilling, D. R. Davis
  1636

Fayalitic Rims and Halos in Foresterites in Allende: New Evidence Against a Metamorphic Origin
S. Weinbruch, H. Palme, W. F. Muller, A. El Goresy
  1637

ALH85085: A Unique Unequilibrated Chondrite
M. K. Weisberg, M. Prinz, C. E. Nehru
  1638

A New Estimate of the Global Frequency of Meteorite Falls
G. L. Wells, M. E. Zolensky
  1639

Chloride and Sulfate Minerals in the Nakhla Meteorite
S. J. Wentworth, J. L. Gooding
  1640

The Significance of Glass Fragments in Feldspathic Fragmental Breccia 67016
S. J. Wentworth, D. S. McKay
  1641

Growth of Planetesimals in the Asteroidal Belt
G. W. Wetherill
  1642

Ridged Plains Units on the Margins of Martian Impact Basins
R. W. Wichman, P. H. Schultz
  1643

Excess of GCR-Ne in the Solar-Gas-rich Matrix of the Chondrite Fayetteville
R. Wieler, A. Pedroni, P. Signer
  1644

The Role of lgneous Sills in Shaping the Martian Uplands
D. E. Wilhelms, R. J. Baldwin
  1645

Light Scattering by Single Particles
A. Williams, B. Hapke
  1646

Improved Determination of PHOBOS and Deimos Masses from Viking Fly-Bys
B. G. Williams, T. C. Duxbury, C. E. Hildebrand
  1647

Regional Models of Topographic Support on Venus from Admittance Analysis of Topography and Calculated Vertical Gravity
D. R. Williams
  1648

The Unusual Alexandra Family
J. G. Williams
  1649

Tharsis Aureole Deposits: an Alternative Origin
S. H. Williams
  1650

Aeolian Gradation on Mars: Widespread and Ancient
S. H. Williams, J. R. Zimbelman
  1651

The Influence of Gravity on Planetary Volcanic Eruption Rates
L. Wilson, J. W. Head
  1652

Sampling the South Pole Atmosphere for Cosmic Dust by Electrostatic Precipitation
R. E. Witkowski, W. A. Cassidy, G. W. Penney
  1653

Sattellite Systematics
C. A. Wood
  1654

Surface Morphology of Terrestrial Impact Craters as Viewed from Orbit
C. A. Wood, R. A. F. Grieve
  1655

The Condensation Sequence Under Non-Classic Conditions (P < 10-3 atm, Non-Cosmic Compositions)
J. A. Wood, A. Hashimoto
  1656

Refractory Lithophile Partitioning in Type B CAI Materials
D. S. Woolum, M. L. Johnson, D. S. Burnett, S. R. Sutton
  1657

The Shanghewan Impact Crater, China
S. Wu
  1658

Quantitative Analysis of the Tharsis Dome of Mars
S. S. C. Wu, P. A. Garcia, A. Howington-Kraus, C. T. Kelly
  1659

The Size, Shape, and Topography of PHOBOS
S. S. C. Wu, F. J. Schafer, P. A. Garcia, A. Howington-Kraus, R. Jordan
  1660

On the Astrogeological Events in China
D.-Y. Xu, Q.-W. Zhang, Y.-Y. Sun, Z. Yan, Z.-F. Chai
  1661

Vapor Composition at Impact Vaporization: Experimental Data
O. I. Yakovlev, V. S. Fainberg, E. A. Kaznacheev, N. N. Pilugin, N. N. Baulin, S. G. Tihomirov
  1662

Local Event of Cosmic Matter Accretion Around 580000 Years Before Present Found in Two Dated Central Pacific Cores
K. Yamakoshi
  1663

Geochemistry of Spinel Lherzolite Xenoliths from Xalapasco de La Joya, Mexico Melting and Metasomatism
L. Yan, D. Elthon
  1664

Fission Track Ages and Stable Oxygen Isotope Composition of the Tektites (Leigongmo) from Hainan Island, China
Z. Yan, L.-F. Ye, Q.-W. Zhang, D.-Y. Xu, Y.-Y. Sun
  1665

Eucrite Pomozdino: Chemical and Mineral Composition of Clasts and Matrix
A. A. Yaroshevsky, L. F. Migdisova, N. N. Kononkova
  1666

Escape from Planet X
K. Zahnle
  1667

The Goldstone Mars Data: Is There Really Evidence for Melting?
A. P. Zent, F. P. Fanale, L. E. Roth
  1668

High Resolution Viking Orbiter Images of Mars: Location and Distribution
J. R. Zimbelman
  1669

Preliminary Photogeologic Mapping in the Memnonia Region of Mars
J. R. Zimbelman
  1670

Terrain Softening Revisted: Photogeological Considerations
J. R. Zimbelman, S. M. Clifford, S. H. Williams
  1671

Anomalous Oxygen in Spinels from a Murray Separate
E. Zinner, M. Tang
  1672

High-Resolution (30 M) Lunar Radar Observations
S. H. Zisk
  1673

Bulk Composition of Matrix and Chondrule Rims for Four Carbonaceous Chondrites
M. E. Zolensky, R. A. Barrett, J. L. Gooding
  1674

On the Optical Detection of Meteoroids, Small Near-Earth Asteroids and Comets, and Space Debris
H. A. Zook
  1675