Lunar and Planetary Institute






Eighteenth Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

Evolution of an Impact-Generated H2O-CO2 Atmosphere and Formation of a Hot Proto-Ocean on Earth
Y. Abe, T. Matsui
  1001

Lunar Volatiles: More Than Meets the Eye?
W. N. Agosto
  1002

P-Fe deg Systematics as an Indicator of Genetic Environment in the Basaltic Achondrite Group
W. N. Agosto
  1003

Mossbauer Study of Ultramicrocrystalline Hematite
D. G. Agresti, J. A. Newcomb, R. V. Morris
  1004

Loss of the Earth's Atmosphere From Giant Impacts
T. J. Ahrens, D. O'Keefe
  1005

The Comet Nucleus Sample Return Mission
T. J. Ahrens
  1006

SEMPA--A Scanning Electron Microscope and Particle Analyzer for the CRAF Mission
A. L. Albee, J. G. Bradley
  1007

Statistics of Meteorite Falls
V. A. Alexeev
  1008

Spallogenic Mn-53 in Some Meteorites
V. A. Alexeev, V. V. Malishev, A. K. Lavrukhina
  1009

Microscopic Lamellar Deformation Features in Quartz From Different Geologic Environments
J. S. Alexopoulos, R. A. F. Grieve, P. B. Robertson
  1010

Melting in the Fe-FeS System and its Relation to the Compositions of the Cores of Earth and Mars
W. W. Anderson, T. J. Ahrens, B. Svendsen
  1011

Melting of Iron Sulfide and Iron Oxide at High Pressure
W. W. Anderson, A. J. Campbell, T. J. Ahrens
  1012

Cretaceous-Tertiary Event: Noble Gases in Turkmenia K/T Boundary Sediments
G. S. Anufriev, B. S. Boltenkov, I. N. Kapitonov, L. V. Usacheva, L. D. Barsukova, M. A. Nazarov
  1013

Absorption Spectra and Bulk Chemical Compositions of Achondritic Polymict Breccias With Reference to Characterization of the Surface of Vesta-Like Asteroids
T. Aoyama, T. Hiroi, M. Miyamoto, H. Takeda
  1014

Ice at the Lunar Poles Revisited
J. R. Arnold
  1015

Mixing Patterns in Viking Orbiter Color Image Data for the Equatorial Region of Mars
R. E. Arvidson, M. A. Dale-Bannister
  1016

Simulation of Venera and Magellan Radar Images From SEASAT Data
R. E. Arvidson, C. Elachi, R. Kwok, J. Curlander, R. S. Saunders
  1017

Types and Characteristics of Terrestrial Anorthosites
L. D. Ashwal, K. Burke
  1018

The Significance of Block Size and Pit Diameter in Rocks at the Viking Lander Sites, Mars
J. C. Aubele, L. S. Crumpler
  1019

Quartz Grains With Planar Features in the Triassic-Jurassic Boundary Sediments From Northern Limestone Alps, Austria
D. D. Badjukov, H. Lobitzer, M. A. Nazarov
  1020

The K/T Event: Amount of the Crater Ejecta and the Possible Impact Site
D. D. Badjukov, M. A. Nazarov, A. S. Alekseev
  1021

Profiles of Lava Flows at Alba Patera, Mars
S. M. Baloga, D. C. Pieri, J. Plescia, P. Davis
  1022

A Revised Martian Relative Age Chronology and Some Geologic Implications
N. G. Barlow
  1023

Chondrules in the Kainsaz CO Chondrite: Mineral Composition and Assemblages; Comparison With the Allende CV and Ordinary Chondrite Chondrules
G. V. Baryshnikova, S. A. Stakheeva, Z. A. Lavrentjeva, K. I. Ignatenko, A. K. Lavrukhina
  1024

Petrologic Observations on the Apollo 15 Drill Core 15007/8
A. Basu, D. S. McKay
  1025

Monomineralic Fragments in the 90-150 Micron Fraction of Soils in the Apollo 15 Drill Core Sections 15007/8 From Station 2
A. Basu, T. Gerke, D. S. McKay
  1026

Heavy Nitrogen in the Bells Carbonaceous Chondrite
R. H. Becker
  1027

Constraints on the Origin of Eucritic Melts: an Experimental Study
J. R. Beckett, E. Stolper
  1028

The Stability of Hibonite in Silicate Melts: Implications for the Origin of Hibonite-Bearing Inclusions From Carbonaceous Chondrites
J. R. Beckett, E. Stolper
  1029

Spectral Alteration Effects in Chondrites Gas-Rich Breccias: Implications for S-Class and Q-Class Asteroids
J. F. Bell III, K. Keil
  1030

Planetary Collision Calculations: Origin of the Moon
W. Benz, A. G. W. Cameron, W. L. Slattery
  1031

Petrology and Compositional Trends in Five New Antarctic Diogenites
J. L. Berkley
  1032

Isotopic Fractionation of KR and Xe Implanted in Solids at Very Low Energies
T. J. Bernatowicz, B. E. Hagee, A. J. Fahey
  1033

15445 and 15455: Results of 39Ar-40Ar Age Dating
M. L. Bernstein
  1034

Partial Melting of an Anhydrous Martian Mantle
C. M. Bertka, J. R. Holloway
  1035

The Comet Experiment: First Results
J. P. Bibring, Y. A. Surkhov, J. Borg, Y. Langevin, P. Salvetat, B. Vassent
  1036

Venus Topography: A Reappraisal
B. G. Bills, M. Kobrick
  1037

The Parquet Terrain of Venus: Geology and Surface Properties of Tellus Regio
D. L. Bindschadler, J. W. Head
  1038

Tectonic Features Due to Gravitational Relaxation of Topography
D. L. Bindschadler, E. M. Parmentier
  1039

The Koronis Family: Possible Evidence for a Recent Catastrophic Disruption
R. P. Binzel
  1040

NI and CR Isotopes in Allende Inclusions
J. L. Birck, C. A. Prombo, G. W. Lugmair
  1041

A37--A Coarse-Grained, Volatile Element-Poor Ca,Al-Rich Inclusion With Huge Fremdlinge
A. Bischoff, H. Palme, B. Spettel
  1042

AEM Characterization of Phases in a Hydrated IDP
D. F. Blake, T. E. Bunch, A. J. Mardinly
  1043

Telescopic Observations of Mars: A Search for Carbonates and Other Salts in the 4 μm Region
D. L. Blaney, T. B. McCord
  1044

Laboratory Spectral Measurements of Palagonite-Salt Mixtures in the Visible and Near Infrared--Implications for Mars
D. L. Blaney, P. A. Walsh, T. B. McCord
  1045

Microbeam Analysis of Interplanetary Dust Particles for Major Elements, Oxygen and Carbon
G. E. Blanford, K. T. Verploeg, D. S. McKay
  1046

Lunar Rotation and the Distribution of Dark-Halo Pyroclastic Deposits: A Cause for Asymmetric Ejecta Patterns
G. Blount, R. Greeley
  1047

The Occurrence of Seismically-Disrupted Antipodal Terrains
G. Blount, P. Barbera, R. Pappalardo, S. Posin, A. Watts
  1048

Aeolian Mixing and the Identification of Active Sand Surfaces on the Earth and Mars
G. Blount, R. Greeley, N. Lancaster, P. R. Christensen, R. Arvidson
  1049

Fremdlinge and the Cooling of CAI: Observational and Experimental Constraints From the Coexistence of NiFe and RuOs
J. D. Blum, J. T. Armstrong, I. D. Hutcheon, G. J. Wasserburg
  1050

Further Studies on the Phenomenon of Shock-Implanted Gases
D. D. Bogard, F. Hoerz, P. Johnson, J. Jordan
  1051

Magnesioferrite From a Nonmarine K-T Boundary Clay in Wyoming
B. F. Bohor, E. E. Foord
  1052

Flyash: an Analog for Spherules in K-T Boundary Clays
B. F. Bohor, D. M. Triplehorn
  1053

A High Abundance and Great Diversity of "Unmelted" Cosmic Dust Grains on the West Greenland Ice CAP
P. Bonte, C. Jehanno, M. Maurette, E. Robin
  1054

Surficial and Structural Analysis of Large Patterned Fractures in Southern Acidalia Planitia, Mars
M. C. Borrello
  1055

Differential Volatilization of Lunar Impact Glass Using Raleigh Fractionation Modeling
L. J. Boschelli, D. S. McKay
  1056

Shock-Enhanced Dissolution of Silicate Minerals: an Important Planetary Surface Process?
M. B. Boslough, R. T. Cygan
  1057

Numerical Model of Fine-Scale Igneous Layering
A. E. Boudreau, I. S. McCallum
  1058

Spectral and Thermal Characteristics of the Southeastern Amenthes Region, Mars
S. Bougan, C. Leff, T. Maxwell
  1059

Origin of CAI Rims--I: The Evidence From the Rare Earth Elements
W. V. Boynton, D. A. Wark
  1060

Fine-Grained Matrices of Chondritic Interplanetary Dust Particles (IDP's)
J. P. Bradley, D. E. Brownlee
  1061

Strontium, Neodymium and Plutonium in Chondritic Phosphates
J. C. Brannon, F. A. Podosek, G. W. Lugmair
  1062

Transmission Electron Microscopy of Graphite-Magnetite Aggregates in the Sharps (H3) Chondrite
A. J. Brearley, E. R. D. Scott, G. J. Taylor, K. Keil
  1063

Accretion Mantles on Mars: New Model for Viking Lander Site Characteristics and Implications for Mars Observer
C. S. Breed, P. A. Davis, J. F. McCauley
  1064

Ripple Blankets: Geomorphic Evidence for Regional Sand Sheet Deposits on Mars
C. S. Breed, J. F. McCauley, P. A. Davis
  1065

FUN Anomalies in Purple, Spinel-Rich Refractory Inclusions
C. A. Brigham, D. A. Papanastassiou, I. D. Hutcheon, J. T. Armstrong, G. J. Wasserburg
  1066

Effects of Small-Scale Surface Roughness on the Bidirectional Reflectance Spectra of Nickel-Iron Meteorites
D. T. Britt, C. M. Pieters
  1067

A Quantitative Comparison of Comet Halley and Carbonaceous Chondrites at the Submicron Level
D. E. Brownlee, M. M. Wheelock, S. Temple, J. P. Bradley, J. Kissel
  1068

Spectral Effects of Dehydration on Phyllosilicates
E. A. Bruckenthal, R. B. Singer
  1069

Evidence for Hydrothermal Alteration in Meteorites of Higher Petrologic Type
R. Burgess, I. P. Wright, C. T. Pillinger
  1070

Circular Structures of Diverse Origins in China: A Possible Resemblance to Northern Venus
K. Burke, V. L. Sharpton, J. W. Kennedy
  1071

Gossans on Mars: Spectral Features Attributed to Jarosite
R. G. Burns
  1072

The Graphical Analysis of Mixing Relationships--Ratio:Ratio Plots
J. C. Butler
  1073

A Non-Primordial Origin for Terrestrial Xe 129 Anomalies
M. W. Caffee, G. B. Hudson
  1074

Fast-Graphics, Solar System Simulation for Microcomputers
J. D. Callahan
  1075

A Model of Diffuse Radar Scattering From Martian Surface Rocks
W. M. Calvin, B. M. Jakosky, P. R. Christensen
  1076

Planetary Collision Calculations: Origin of Mercury
A. G. W. Cameron, W. Benz, W. L. Slattery
  1077

Surface Scattering Properties From Lunar Radar Polarization Data
B. A. Campbell, S. H. Zisk, T. W. Thompson, P. J. Mouginis-Mark
  1078

Volumes of Channels, Canyons and Chaos in the Circum-Chryse Region of Mars
M. H. Carr, S. S. C. Wu, R. Jordan, F. J. Schafer
  1079

A Laser Microprobe--Mass Spectrometric Study of an Alteration Product in the Shergottite EETA79001
R. H. Carr, E. K. Gibson Jr.
  1080

Outcomes of Gravitational Encounters of a Planetesimal With a Planetary Embryo
A. Carusi, R. Greenberg, G. B. Valsecchi
  1081

Further Development of Monte Carlo Modeling of Lunar Megaregolith Thickness
J. Cashore
  1082

The Geological Evolution of Alba Patera, Mars
P. Cattermole
  1083

A Search for Evidence of Extinct Lead 205 in Iron Meteorites
J. H. Chen, G. J. Wasserburg
  1084

Further Aspects of Lunar Palaeointensity Determinations and the Origin of the Ancient Lunar Magnetic Field
S. K. Chowdhary, S. K. Runcorn, D. W. Collinson, A. Stephenson
  1085

Thermal-Infrared Spectral Observations of Martian Candidate Materials in Emission
P. R. Christensen, S. J. Luth
  1086

Comparative Studies of Luna 16, 20 and 24 Regoliths by Means of Magnetic Resonance and Mossbauer Spectroscopy
A. Cimbalnikova, Z. Frait, O. D. Rode, T. Zemcik
  1087

The Evolution of Experimental Regoliths: Effects of Impact Velocity
M. J. Cintala, F. Hoerz, T. H. See, F. Cardenas
  1088

Continuous Geochemical Surface Monitor and Hazard Detector for a Mars Rover
B. C. Clark, M. G. Thornton
  1089

Coma Particle Type Occurrences: Evidence for Chemical Heterogeneity in Comet Halley
B. C. Clark, L. W. Mason, J. Kissel
  1090

Characterization of Venus Subdued Terrains With Ground-Based Radar-Derived Data
P. E. Clark, R. F. Jurgens, M. Kobrick
  1091

Galileo Science Data System
T. C. Clarke, J. L. Anderson
  1092

Cosmic Chemical Memory of Ca48 50Ti Correlation
D. D. Clayton
  1093

Oxygen and Silicon Isotopes in Inclusions and Chondrules From Vigarano
R. N. Clayton, T. K. Mayeda, G. J. MacPherson, L. Grossman
  1094

Oxygen Isotopes in Allende Chondrules and Coarse-Grained Rims
R. N. Clayton, T. K. Mayeda, A. E. Rubin, J. T. Wasson
  1095

Theoretical Equilibrium Profiles of the Martian Perennial Polar Caps
S. M. Clifford
  1096

Possible Isotopic Resetting Mechanisms in Shergottite Meteorites
R. O. Colson, L. Nyquist, G. McKay, F. Hoerz
  1097

The Evolution of Topography on a Comet
J. E. Colwell, B. M. Jakosky
  1098

Geologic and Remote Sensing Studies of Rima Mozart: Early Results
C. R. Coombs, B. R. Hawke
  1099

Explosive Volcanism on the Moon
C. R. Coombs, B. R. Hawke, L. R. Gaddis
  1100

Thermokarstic Evolution of Impact Craters on Mars
F. M. Costard, A. Dollfus
  1101

Thickness and Volume of Mare Tsiolkovsky, Lunar Farside
R. A. Craddock, R. Greeley
  1102

Martian Outflow Channels: IRTM and Visual Observations
R. A. Craddock, R. Greeley, P. R. Christensen
  1103

Electromagnetic Emissions From Low Angle Hypervelocity Impacts
D. A. Crawford, P. H. Schultz
  1104

Miranda Geology and Tectonics: A Non-Catastrophic Interpretation
S. K. Croft
  1105

Tectonism and Volcanism in Ganymede's Dark Terrain
S. K. Croft, B. N. Goudreau
  1106

Equations of State of Ammonia-Water Liquid: Planetological Implications
S. K. Croft, J. Kargel, J. I. Lunine
  1107

Structural Control of Lunar Sinuous Rilles in the Orientale Basin
D. A. Crown, R. Greeley
  1108

Bilateral Topographic Symmetry Across Aphrodite Terra, Venus
L. S. Crumpler, J. W. Head
  1109

Regional Linear Cross-Strike Discontinuities in the Western Aphrodite Highlands, Venus
L. S. Crumpler, J. W. Head, D. B. Campbell
  1110

Age of A15 Norites
E. J. Dasch, L. E. Nyquist, G. Ryder, A. M. Steele, H. Wiesmann, B. M. Bansal, C.-Y. Shih
  1111

Photoclinometric Determination of Surface Topography and Albedo Variations on Io
A. G. Davies, L. Wilson
  1112

An Unaltered Group I Fine-Grained Inclusion From the Vigarano Carbonaceous Chondrite
A. M. Davis, G. J. MacPherson, R. W. Hinton, J. R. Laughlin
  1113

Electron-Microprobe and Cathodoluminescence Study of Glasses in Type 3 Ordinary Chondrites: Relevance to Metamorphism and Aqueous Alteration
J. M. Dehart, G. E. Lofgren, D. W. G. Sears
  1114

Eastern Lunae Planum Outflow Complex: Analogy to Overbank Flooding
R. A. de Hon
  1115

Striped Plains of Acidalia Planitia, Mars
R. A. de Hon
  1116

ALH82106/130 and the Fractionation of Augite-Bearing Ureilites
J. S. Delaney, M. Prinz
  1117

Geochemically Inferred Redox State in the Source-Materials of Terrestrial Impact Glasses
J. W. Delano, V. Bouska, Z. Randa
  1118

Multi-Element Abundances of Individual Mare Volcanic Glasses by Collaborative Electron Microprobe and Neutron Activation Analyses: Interim Report #2
J. W. Delano, S. S. Hughes, P. L. Verplanck, R. A. Schmitt
  1119

The SR Isotope System in Geological Samples Shocked up to 60 GPa
A. Deutsch
  1120

Isotope Systematics in Crystalline Clasts of Shock Stage I-III From the Polymict Breccia of the Haughton Crater, Canada
A. Deutsch, S. Teufel, A. Metzler-Ferling
  1121

On the Problem of Uranus Magnetic Field
Sh. Sh. Dolginov
  1122

Grain Formation and Accretion: Initial Stages
B. Donn
  1123

Neutron Mode of the Mars Observer Gamma Ray Spectrometer
D. M. Drake, W. C. Feldman, R. C. Reedy, B. M. Jakosky
  1124

Lunar Geoscience Orbiter and the Origin of the Moon
M. J. Drake
  1125

Water, Rare Gases and Other Volatiles on Earth and Mars
G. Dreibus, H. Waenke
  1126

Evidence for 36 m.y. and 90 m.y. Periodicities in the Terrestrial Cratering Record
R. J. Durrheim, W. U. Reimold
  1127

The D/H and O18 O16 Isotopic Ratios in Comet Halley
P. Eberhardt, R. R. Hodges, D. Krankowsky, J. J. Berthelier, W. Schulte, U. Dolder, P. Lammerzahl, J. H. Hoffman, J. M. Illiano
  1128

The Geology of Pavonis Mons, Mars
K. S. Edgett, J. R. Zimbelman, J. W. Branstrator
  1129

Composition and Petrogenesis of Parental Komatiite Liquids
D. Elthon
  1130

Partitioning of NI Between Olivine and High-MgO Basaltic Liquids
D. Elthon
  1131

A Model of the Porous Structure of Icy Satellites
J. Eluszkiewicz, J. Leliwa-Kopystynski
  1132

Lunar Light Plains: Ages and Composition
S. Engel, G. Neukum, R. Jaumann, E. Nagel
  1133

Cosmogenic Radionuclides in H-Chondritic Meteorite Finds
P. A. J. Englert
  1134

Unusual Isotopic Compositions of Hydrogen, Nitrogen, and Carbon of Amino Acids and Carboxylic Acids From the Murchison Meteorite
S. Epstein, R. V. Krishnamurthy, J. R. Cronin, S. Pizzarello, G. U. Yuen
  1135

MG Isotopic Composition of Microtektites and Flanged Australite Buttons
T. M. Esat, S. R. Taylor
  1136

MG Isotopic Composition of Some Interplanetary Dust Particles
T. M. Esat, S. R. Taylor
  1137

Solar Cosmic Ray Produced Radionuclides in the Salem Meteorite
J. C. Evans, J. H. Reeves, R. C. Reedy
  1138

Lunar Meteorites Y-82192 and Y-82193: Identical Cosmic-Ray Exposure History and Terrestrial Age
O. Eugster
  1139

Trapped Xe Isotopically Different From Modern Solar Wind Xe in Lunar Breccia 60018 and Black Glass 74001
O. Eugster, S. Niedermann
  1140

Determination of the Fe Isotopic Ratios in Terrestrial Minerals and a Lance Hibonite-Hercynite Inclusion
A. Fahey, E. Zinner
  1141

More Isotopic Measurements in CM Hibonites: Carbon, Oxygen and Silicon
A. Fahey, J. N. Goswami, K. D. McKeegan, E. K. Zinner
  1142

Design and Engineering of Lunar Science Experiments: The Importance of Getting an Early Start
K. O. Fairchild, M. L. Roberts, K. C. Templin
  1143

Vertical vs. Lateral Mixing of Highland Materials and Minimum Basalt Thickness in Northern Mare Fecunditatis
W. H. Farrand
  1144

Use of Accelerator Mass Spectrometry for the Determination of Osmium Isotopes
U. Fehn, R. Teng, D. Elmore, P. W. Kubik, H. E. Gove
  1145

Gravitational Effects on Mars Neutron Spectra
W. C. Feldman, D. M. Drake, R. D. O'dell, F. W. Brinkley Jr., R. C. Anderson
  1146

Lunar Agricultural System Design Considerations
J. Fielder, N. Leggett
  1147

A Metal Particle in Ca, Al-Rich Inclusion From the Efremovka CV Chondrite
A. V. Fisenko, K. I. Ignatenko, A. Yu. Ljul, A. K. Lavrukhina
  1148

Neodymium in HNO3-and HClO4-Soluble Fractions From the Efremovka CV Chondrite
A. V. Fisenko, S. F. Karpenko, L. F. Semjonova, A. V. Ljalykov, V. G. Spiridonov, Yu. A. Shukolyukov, A. K. Lavrukhina
  1149

Earth Encounter Velocities and Exposure Ages of IDPs From Asteroidal and Cometary Sources
G. J. Flynn
  1150

First Cosmic Dust Trace Element Analyses With the Synchrotron XRF Microprobe
G. J. Flynn, S. R. Sutton
  1151

Compositional Homogeneity and Heterogeneity in High Grade Enstatite Chondrites
R. A. Fogel, P. C. Hess, M. J. Rutherford
  1152

Variability in Spectral Signatures of Terrestrial Ignimbrites and Implications for Volcanology on Mars
P. W. Francis
  1153

Resurfacing in the Transition Zone in Eastern Mars: Evidence for Variation in Efficiency in Plains Formation
H. Frey, J. A. Semeniuk
  1154

Common Age Resurfacing Events in the Elysium-Amazonis Knobby Terrain on Mars
H. Frey, J. A. Semeniuk, S. Tokarcik
  1155

Age of Different Chondrules of Elenovka Meteorite
M. M. Fugzan, M. A. Ivanova, A. Ya. Skripnik, Yu. A. Shukolyukov
  1156

Instrumental Requirements and Observational Strategies for Spectrophotometric Data Acquisition During a CRAF-Type Asteroid Flyby
M. J. Gaffey
  1157

Surface Lithologic Heterogeneity and Body Shape for Asteroid (15) Eunomia: Evidence From Rotational Spectral Variations and Multi-Color Lightcurve Inversions
M. J. Gaffey, S. J. Ostro
  1158

Possible Assimilation by a Mafic Magma: The Endion Sill, Duluth, Minnesota
J. E. Gardner, L. A. Haskin, J. C. Brannon
  1159

Suspected Impact Crater Near AL Madafi, Saudi Arabia
J. B. Garvin, H. W. Blodget
  1160

Venus Surface Compositions: Implications From Terrestrial Geochemical Analogies
J. B. Garvin, W. B. Bryan
  1161

Laser Altimetry in Planetary Geology
J. B. Garvin, J. L. Bufton, J. B. Abshire, M. T. Zuber
  1162

On the Release of Oxygen From the Intensively Shocked Meteorites and Terrestrial Rocks
M. V. Gerasimov
  1163

Mass-Spectrometrical Analyses of Gases Originated During Impulsive Evaporation of Meteorites and Terrestrial Rocks
M. V. Gerasimov, B. L. Satovsky, L. M. Mukhin
  1164

Hydrogen Abundances vs. Depth in the Lunar Regolith: Results From an Apollo 15 Double Drive Tube and Deep Drill Core
E. K. Gibson Jr., R. Bustin
  1165

Hydrogen Distributions in Lunar Materials
E. K. Gibson Jr., R. Bustin, A. Skaugset, R. H. Carr, S. J. Wentworth, D. S. McKay
  1166

Coesite Associated with North American Tektite Debris in DSDP Site 612 on the Continental Slope Off New Jersey
B. P. Glass
  1167

A New Term is Needed to Distinguish Impact Ejecta in the Form of Glassy Spherules Containing Primary Crystallites From Microtektites
B. P. Glass, C. A. Burns
  1168

Petrochemical Specific Features of the Logoisk Crater Glasses
L. I. Glazovskaya, O. V. Parfenova
  1169

Locations, Temperatures and Areas of Io's Hot Spots From Multi-Color Infrared Photometry of Occultations
J. D. Goguen, D. Matson, W. Sinton, R. Howell, M. Dyck, G. Veeder, T. Johnson, R. Nelson, A. Lane, R. McLaren
  1170

Early Thermal Profiles of Ganymede and Callisto
M. P. Golombek, W. B. Banerdt
  1171

Failure Strength of Icy Lithospheres
M. P. Golombek, B. Banerdt
  1172

Physiographic Constraints on the Origin of Lunar Wrinkle Ridges
M. P. Golombek, B. J. Franklin
  1173

Geochemistry of Crustal Xenoliths From Xalapasco de la Joya (State of San Luis Potosi, Mexico)
C. Gomez-Moran, D. Elthon
  1174

Thermal Stability of Tochilinite
J. L. Gooding, M. E. Zolensky
  1175

Martian (?) Calcite and Gypsum in Shergottite EETA79001
J. L. Gooding, S. J. Wentworth, M. E. Zolensky
  1176

Complex Igneous Activity on the Ureilite Parent Body
C. A. Goodrich, J. H. Jones
  1177

1986 DA and 1986 EB: Iron Objects in Near-Earth Orbits
J. C. Gradie, E. F. Tedesco
  1178

Physical Properties of the Beta Pictoris Circumstellar Disk
J. Gradie, J. Hayashi, B. Zuckerman, H. Epps, R. Howell
  1179

The EET 83309 Polymict Ureilite: Its Relationship to Other Ureilites on the Basis of Stable Isotope Measurements
M. M. Grady, C. T. Pillinger
  1180

A Possible Volatile-Rich Air-Fall Deposit in the Electris Region of Mars
J. A. Grant, P. H. Schultz
  1181

Possible Intense Vortex Tracks on Mars
J. A. Grant, P. H. Schultz
  1182

Global Geologic Mapping of Io
R. Greeley, R. A. Craddock, D. A. Crown, L. A. Leshin, G. G. Schaber
  1183

Venus: Compositional and Mechanical Effects From Windblown Grains
R. Greeley, J. R. Marshall, J. B. Pollack
  1184

Incipient Runaway Growth of Planetesimals: Why the Biggest Bodies Were Not All the Same Size
R. Greenberg, B. Rizk
  1185

Is There a Significant Periodic Signal in the Terrestrial Cratering Record?
R. A. F. Grieve, A. K. Goodacre
  1186

Limits on Models of Lithospheric Heat Transport on Venus From Impact Crater Density
R. E. Grimm, S. C. Solomon
  1187

Viscous Relaxation of Impact Crater Relief on Venus: Constraints on Crustal Thickness and Thermal Gradient
R. E. Grimm, S. C. Solomon
  1188

Evidence for a Thick Transient Layer in the Isidis Impact Basin
P. Grizzaffi, P. H. Schultz
  1189

Dust Emission of Comet Halley as Observed by In Situ Experiments
E. Grun
  1190

Thermoluminescence Properties of Synthetic Feldspars: Implications for Chondrite Thermal Histories
K. R. Guimon, G. E. Lofgren, D. W. G. Sears
  1191

Origin and Evolution of Valleys on Martian Volcanoes: The Hawaiian Analog
V. C. Gulick, V. R. Baker
  1192

Transport of Water From the Residual North Polar CAP on Mars
R. M. Haberle, B. M. Jakosky
  1193

Properties of Synthetic Uranus at High Pressures and Temperatures
D. C. Hamilton, W. J. Nellis, N. C. Holmes, H. B. Radousky, F. H. Ree, M. Nicol
  1194

Thermoluminescence of Inclusions From the Cumberland Falls Meteorite
M. Haq, F. A. Hasan, D. W. G. Sears
  1195

Comparative Resolutions of Possible Time Variations in the Weak Interaction Coupling Constant From Geochronology, Oklo and Primordial Nucleosynthesis
C. L. Harper
  1196

Geochronology, Time-Asymmetry and the Foundations of Quantum Mechanics
C. L. Harper
  1197

Fourier Analysis of Asteroid Lightcurves: Some Preliminary Results
A. W. Harris
  1198

Vertical Distribution of Water Vapor in the Atmosphere of Mars: Error Analysis and Preliminary Results
H. M. Hart, B. M. Jakosky
  1199

A Satellite/Asteroid Mystery and the Primordial Scattering of C Asteroids Through the Solar System
W. K. Hartmann
  1200

Modelling of Lunar Accretion in a Circumterrestrial Disk
W. K. Hartmann, D. Spaute
  1201

Comets and Dark Asteroids: an Update
W. K. Hartmann, D. P. Cruikshank, D. J. Tholen
  1202

Studies of Trojan and Hilda Asteroid Lightcurves
W. K. Hartmann, D. J. Tholen, D. P. Cruikshank
  1203

Thermoluminescence and X-Ray Diffraction Studies of Annealed Oligoclase
C. P. Hartmetz, D. W. G. Sears
  1204

Thermal Stability of Thermoluminescence in a Type 5 and Type 3.4 Ordinary Chondrite
F. A. Hasan, M. Haq, D. W. G. Sears
  1205

Toward Geochemical Prospecting for Lunar Ores
L. A. Haskin
  1206

Modeling the Effects of Breccia Fragment Size on Identification of Parent Rock Type, Based on a Stillwater Anorthosite Boulder
L. A. Haskin, D. J. Lindstrom
  1207

Modeling the Effects of Breccia Fragment Size on Perceived Rock Compositions
L. A. Haskin, D. J. Lindstrom
  1208

Nearly Pure Plagioclase Anorthosites; Lunar and St. Urbain
L. A. Haskin, R. F. Dymek, R. L. Korotev, L. P. Gromet
  1209

Remote Sensing Studies of the Rima Hyginus Region of the Moon
B. R. Hawke, C. R. Coombs
  1210

Evidence for Topographic Rises, Fracture Zones, Topographic Symmetry, Central Rift Zones, Transform Faults, and Crustal Spreading: Aphrodite Terra, Venus
J. W. Head, L. S. Crumpler
  1211

Magma Migration and Hawaiian-Style Eruptions in Shield Volcano Rift Zones; The Pu'u `O'o Eruptive Episodes, Kilauea East Rift, Hawaii
J. W. Head, L. Wilson
  1212

Compositions of Glass Fragments in Apollo 16 Regolith Breccias
C. F. Heavilon, A. Basu
  1213

Photometric Properties of Lunar Terrains Derived From Hapke's Equation
P. Helfenstein, J. Veverka
  1214

The Howardite Parent Body: Composition and Crystallization Models
R. H. Hewins
  1215

Raman Spectra of Carbon in the Canyon Diablo Iron Meteorite
D. Heymann
  1216

Raman Study of Experimentally Shocked Plagioclase
D. Heymann, H. Boyer
  1217

Raman Study of Carbon in Allende
D. Heymann, N. W. Read
  1218

Raman Studies of Shocked Dunite, Enstatite, and Augite
D. Heymann, T. A. Cellucci, H. Boyer
  1219

The K/T Impact Excavated Oceanic Mantle: Evidence From REE Abundances
A. R. Hildebrand, W. V. Boynton
  1220

Isotopic Mass Fractionation of Potassium in the Earth Compared to the Bulk Solar System
R. W. Hinton, R. N. Clayton, E. J. Olsen, A. M. Davis
  1221

Impact Spall as a Mechanism for Surface Material Ejection
K. A. Holsapple, K. Y. Choe
  1222

A Model for the Formation of Magnetic Anomalies Antipodal to Lunar Impact Basins
L. L. Hood
  1223

Contributions of an LGO Mission to the Solution of Lunar Geophysical Issues
L. L. Hood
  1224

Ganymede and Callisto: Impact Crater Ejecta Types
V. M. Horner, R. Greeley
  1225

Experimental Drainage Pits as Possible Analogues to Structures on PHOBOS
K. C. Horstman, H. J. Melosh
  1226

Experimental Regolith Studies: The Effects of Initial Fragment Size on Comminution Behavior
F. Hoerz, T. H. See, M. J. Cintala, F. Cardenas
  1227

Fayalite-Rich Rims Around Forsteritic Olivines in CAIs and Chondrules in Carbonaceous Chondrites: Types, Compositional Profiles and Constraints of Their Formation
X. Hua, J. Adam, H. Palme, A. El Goresy
  1228

Integrated Petrogenetic Models of Apollo 15 Yellow/Brown Glass, Green Glass and Olivine Mare Basalt, Consistent With the Magma Ocean--Cumulate Hypotheses
S. S. Hughes, J. W. Delano, R. A. Schmitt
  1229

Partial Evaporation of Pre-Solar Dust: The Mechanism of Fe/Silicate and Oxygen Isotopic Variation in Chondrites?
G. R. Huss
  1230

A Closer Look at the Significance of Chemical Variations in Enstatite Chondrites
M. L. Hutson
  1231

Correlated Morphological, Chemical, and Isotopic Systematics From Murchison (C2M) Hibonites
T. R. Ireland
  1232

The Kaidun Meteorite: Oxygen Isotopic Composition
A. V. Ivanov, A. A. Ulyanov, V. I. Ustinov, Yu. A. Shukolyukov
  1233

Sublimation of Water From the Residual North Polar CAP on Mars
B. M. Jakosky
  1234

Magnesian Members of the Lunar Ferroan Anorthosite Suite
O. B. James
  1235

Surface Tectonics From Sinker Induced Mantle Convection: Application to Miranda
D. M. Janes, H. J. Melosh
  1236

New Spectrophotometric Studies of the Lunar Surface: Distribution and Composition of Lithologic Units
R. Jaumann, G. Neukum
  1237

Unusual Cosmic Grains in a Jurassic Hardground
C. Jehanno, D. Boclet, P. Bonte, A. Castellarin, R. Rocchia
  1238

Fe/Ni Cosmic Dust Grains: A Comparison of the Greenland and Deep-Sea Collections
C. Jehanno, M. Maurette, E. Robin
  1239

Bits and Pieces From Halley's Comet
E. K. Jessberger, J. Kissel
  1240

A Three Component Model for the Bulk Composition of the Moon
J. H. Jones, J. W. Delano
  1241

Large Fossil Mud Lakes or Giant Mud Sheet Floods in Syrtis Major (Isidis Planitia) and Mare Australe, Mars
H.-P. Jons
  1242

Rare Gas and Petrological Studies of Disaggregated Size Separates of the Fayetteville Meteorite Breccia
J. Jordan, R. A. Barrett, D. D. Bogard, D. S. McKay
  1243

HG Geothermometry Applied to Achondritic Meteorites
S. Jovanovic, G. W. Reed Jr.
  1244

Density and Viscosity Measurements of NH3-H2O Liquids
J. S. Kargel
  1245

Mass Distributions in Minimum Mass Models of the Jovian, Saturnian, Uranian, and Solar Nebulae
J. S. Kargel
  1246

Nuclear Tracks of VH-Group Solar Cosmic Rays in the Ordinary Chondrite Samples
L. L. Kashkarov, L. I. Genaeva, G. V. Kalinina, A. K. Lavrukhina
  1247

Thermoluminescence in Separated Chondrules in the Kainsaz CO Chondrite
V. G. Kashkarova, L. L. Kashkarov, G. V. Baryshnikova, A. K. Lavrukhina
  1248

Experimental Constraints on the Early Differentiation of the Earth's Mantle
T. Kato, I. Irifune, A. E. Ringwood
  1249

Isotopic Characterisation of Kerogen-Like Material From the Murchison Carbonaceous Chondrite
J. F. Kerridge, R. Shipp, S. Chang
  1250

Thermal History of Eucrites: Model Based on Pyroxene Geospeedometry
N. R. Khisina, L. V. Petushkova, A. Y. Skripnik, M. A. Nazarov, E. V. Zabalueva
  1251

Mantle Plumes on Venus
W. S. Kiefer, B. H. Hager
  1252

A Numerical Study of the Giant Impact Origin of the Moon: The First Half Hour
M. E. Kipp, H. J. Melosh
  1253

Partitioning of Siderophile and Chalcophile Elements Between Metal, Sulfide, Olivine, and Glass in a Naturally Reduced Basalt From Disko Island, Greenland
W. Kloeck, H. Palme
  1254

The Melting of Metallic FeO to Over 100 GPa: Implications for Core Temperature and Composition
E. Knittle, R. Jeanloz
  1255

Water Content of Tektites and Impact Glasses and Related Chemical Studies
C. Koeberl, A. Beran
  1256

Petrology and Geochemistry of the Ningqiang (CV3) Chondrite
C. Koeberl, Th. Ntaflos, G. Kurat, C. F. Chai
  1257

Iridium Distribution in the Peat Layers From Area of Tunguska Event
M. I. Korina, M. A. Nazarov, L. D. Barsukova, I. V. Suponeva, G. M. Kolesov, E. M. Kolensnikov
  1258

Formation Models of Sialic Matter and Problem of Crust Composition for the Terrestrial Planets
M. J. Korotaev, A. M. Nikishin
  1259

Composition of Magnetic and Nonmagnetic Fractions of Noritic Impact Melt Breccias From Apollo 16
R. L. Korotev
  1260

Does the Lunar Crust Have a Europium Anomaly?
R. L. Korotev, L. A. Haskin
  1261

Composition and Maturity of the Van Serg Crater Core (Section 79002)
R. L. Korotev, R. V. Morris, H. V. Lauer Jr.
  1262

Formation of the Lamellar Structure in Group IA and IIICD Iron Meteorites
J. A. Kowalik, D. B. Williams, J. I. Goldstein
  1263

A Spreading Center on Venus?
R. C. Kozak, G. G. Schaber
  1264

Partitioning of Gallium into Chromite, and Consequences for Iron Meteorite Formation
A. Kracher, T. M. Benjamin, C. J. Duffy, P. S. Z. Rogers
  1265

Fe, Ca-Rich Rims Around Magnesian Chondrules in the Kainsaz (CO3) Chondrite
D. A. Kring
  1266

Petrography and Mineral Chemistry of Spinel Grains Separated From the Murchison Meteorite
S. M. Kuehner, L. Grossman
  1267

The OC Puzzle: Pre-and Synaccretionary Processes Offer a Solution
G. Kurat
  1268

Allende-AF: Undisturbed Record of Condensation, Accretion, and Metasomatism
G. Kurat, H. Palme, F. Brandstaetter, H. Huth
  1269

On the Possible Ophiolitic Origin of Some Slave Province Greenstone Belts
T. M. Kusky, W. S. F. Kidd, D. G. de Paor, C. Simpson, C. Isachsen, D. C. Bradley, L. Bradley
  1270

Recent Evidence on the Nature of the Late Pliocene Impact Event
F. T. Kyte, L. Zhou, J. T. Wasson
  1271

SNC Meteorites: The Metamorphic Record
Ph. Lambert
  1272

Fracture Cascade for a Meteorite at Atmospheric Entry: Canyon Diablo, Odessa and Wolf Creek Irons
B. Lang, K. Franaszczuk
  1273

Impact Ionization Mass Spectrometry of Cometary Grains on Board Giotto, VEGA 1 and VEGA 2 Spacecrafts: Preliminary Statistical Analysis of Spectra in Compressed Modes
Y. Langevin, J. Kissel, J.-L. Bertaux, E. Chassefiere
  1274

Chemistry of the Apollo 15 Apennine Front: Highland Lithologies
J. C. Laul
  1275

Laser Probe39Ar-40Ar Dating of Impact Melt Glasses in Lunar Breccia 15466
M. A. Laurenzi, G. Turner
  1276

Cosmic-Ray-Produced KR in Core Samples of the St. Severin Meteorite
B. Lavielle, K. Marti, G. Simonoff
  1277

Occurrence of Sc-Rich Phases in the Kainsaz CO Carbonaceous Chondrite
A. K. Lavrukhina, A. Yu. Ljul, G. M. Kolesov
  1278

The Isotopic Composition of Xe in Mineral Phases of the Pillistfer EL6 and Adhi Kot EH4 Enstatite Chondrites
A. K. Lavrukhina, Yu. A. Shukolyukov, D. V. Minh, A. Z. Lavrenteva, S. A. Stakheev
  1279

Observations of Industrial Sulfur Flows: Implications for Io
S. W. Lee, D. A. Crown, N. Lancaster, R. Greeley
  1280

Development of the Prototype Atmospheres Node of the Planetary Data System
S. W. Lee, R. L. Davis, G. H. Ludwig, C. A. Barth, S. A. Stern, S. Lasater, K. Simmons
  1281

Inferences on the Evidence for Extinct Mn-53
T. Lee
  1282

Interstellar Diamonds in Meteorites
R. S. Lewis, T. Ming, J. F. Wacker, E. Steel
  1283

Stochastic Models of Refractory Interstellar Dust
K. Liffman, D. D. Clayton
  1284

Geochemical and Petrologic Studies of Clasts in Apennine Front Breccia 15459
M. M. Lindstrom, U. B. Marvin
  1285

Protoplanet Accretion Rates in a Disk of Planetesimals With Low Random Velocities
J. J. Lissauer, Y. Greenzweig
  1286

Convective Stress Field in Venus
H. S. Liu
  1287

A Chemical Study of Kaba (CV3 Chondrite) Inclusions
Y.-G. Liu, R. A. Schmitt
  1288

Mokoia Ca-Al Inclusions (CAIs) With Negative and Positive CE Anomalies-Interim Report #2
Y.-G. Liu, R. S. Rajan, R. A. Schmitt
  1289

Elemental Composition of Chondrules From the Murray CM Chondrite
A. Yu. Ljul, G. M. Kolesov, A. K. Lavrukhina
  1290

Dynamic Crystallization Experiments on Chondrule Melts of Porphyritic Olivine Composition: Effect of Annealing at 1200 and 1000 deg C on Major and Minor Element Zoning and Concentration
G. E. Lofgren
  1291

Dynamic Crystallization Experiments on Chondrule Melts of Porphyritic Olivine Composition: Petrographic Comparison of Natural and Experimentally Produced Chondrules
G. E. Lofgren
  1292

Olivine/Low-Ca Pyroxene Liquidus Relations and Their Bearing on Eucrite Petrogenesis
J. Longhi, V. Pan
  1293

History of Valles Marineris
B. K. Lucchitta
  1294

Characterization of Mineralogical Changes With Longitude on the Lunar Nearside Based on Spectral Reflectance Measurements
P. G. Lucey, B. R. Hawke
  1295

Criteria for the Remote Detection of Pristine Rock Using Near-Infrared Reflectance Spectroscopy
P. G. Lucey, B. R. Hawke
  1296

Probable Outcrops of Mg-Gabbronorite in the Lunar Highlands Detected by Near-Infrared Remote Sensing
P. G. Lucey, B. R. Hawke
  1297

Speculations on the Origin of the Possible Compositional Layering of the Upper Ten Kilometers of the Lunar Crust
P. G. Lucey, B. R. Hawke
  1298

A Search for Water on the Moon at the Reiner Gamma Formation, A Possible Comet Impact Site
P. G. Lucey, T. R. Roush, P. D. Owensby, D. Blaney
  1299

The Age of the Lunar Crust: 60025--Methuselah's Legacy
G. W. Lugmair
  1300

Trace Elements in Single Mineral Grains From Silicate Inclusions in the Landes Meteorite
D. Luzius-Lange, H. Palme
  1301

Nirgal Vallis Basin: Some Questions on Fluvial and Regolith History
D. J. MacKinnon, K. L. Tanaka
  1302

Rare Earth Element Distribution in a Complex Type B1 Allende Inclusion, an Ion Microprobe Study
G. J. MacPherson, G. Crozaz, L. L. Lundberg
  1303

Nonequilibrium Thermodynamics of Processes at the Inner-Outer Core Boundary in the Venus' Interior
E. Majewski
  1304

Computer Simulation Model for Early Post-Capture Lunar Orbital Evolution: Implications for Thermal History of Moon and Earth
R. J. Malcuit, R. R. Winters
  1305

Equation of State Synchrotron Experiments with Hydrogen at High Pressures
H. K. Mao, L. Finger, R. Hazen, J. Xa, R. Hemley, A. Jeffcoat, P. M. Bell
  1306

Comparisons of Dust Components in Three Dated Ice Samples From the Allan Hills Region, Antarctica
U. B. Marvin
  1307

Geological Evolution of Coronae (Complex Circular Features) on Venus
H. Masursky
  1308

Mars Lander/Rover/Returned Sample Sites
H. Masursky, M. G. Chapman, P. A. Davis, A. L. Dial Jr., M. E. Strobell
  1309

Fragmentation Process of Allende Meteorite During its Atmospheric Passage
T. Matsui, E. Tajika
  1310

Ages of Fracturing and Resurfacing Along the Martian Dichotomy Boundary Between Nepenthes and Nilosyrtis Mensae
T. A. Maxwell, G. E. McGill
  1311

The Geology of Pine and Crater Buttes: A Basaltic Plains Volcanism Planetary Analog Study
P. F. Mazierski
  1312

The Parental Magmas of the Stillwater Complex
I. S. McCallum
  1313

RB and CS in the Earth and Moon
W. F. McDonough, S.-S. Sun, A. E. Ringwood, E. Jagoutz
  1314

Mars as a Planet
A. S. McEwen
  1315

The 3:1 Kirkwood Gap as Sources of Ordinary Chondrites: Perspectives From Spectral Reflectance
L. A. McFadden, F. Vilas
  1316

Variable Activity at Comet Halley March 23-25, 1986: IUE Observations
L. A. McFadden, M. F. A'Hearn, P. D. Feldman
  1317

Petrologic Evaluation of the Components of Granulitic Breccia 67215
J. J. McGee
  1318

Relative Ages of Faulting, Mesa Development, and Polygonal Terrane, Eastern Utopia Planitia, Mars
G. E. McGill
  1319

Topography Buried Beneath the Plains of Utopia and Elysium, Mars
G. E. McGill
  1320

The Role of Comets in the Prebiological Evolution of the Early Solar System
C. P. McKay
  1321

Whitlockite/Melt Partitioning and Henry's Law: Shergotty Late-Stage Minerals
G. McKay, J. Wagstaff, L. Le, D. Lindstrom, R. Colson
  1322

Hydrogen Isotopic Variations in Interplanetary Dust Particles
K. D. McKeegan, P. D. Swan, R. M. Walker, B. Wopenka, E. Zinner
  1323

Spherical-Shell vs. Flat-Plate Mascon Loading Models for Caloris
W. B. McKinnon
  1324

Matrix Compositions in Antarctic and Non-Antarctic CM Carbonaceous Chondrites
H. Y. McSween Jr.
  1325

Lunar Geoscience Observer Spacecraft
B. A. Meberg, W. V. Fuldner, R. C. Maehl
  1326

Sintering of Lunar Soil Simulants Using 2.45 GHz Microwave Radiation
T. T. Meek, D. T. Vaniman, R. D. Blake, M. J. Godbole
  1327

Geometrically-Arrayed, Instrument-Carrying Elevated Cable Systems for Investigating Inaccessible Regions of the Lunar Surface
T. A. Meier
  1328

A Finite-Element Study of Multiring Basin Tectonics
H. J. Melosh, V. Hillgren
  1329

Polymict Impact Breccias on the Eucrite Parent Body: I. Lithic Clasts in Some Eucrites and Howardites
K. Metzler, D. Stoeffler
  1330

Sulfide Nodules of Burkhala Iron Meteorite
L. F. Migdisova, A. A. Yaroshevsky, N. I. Zaslavskaya
  1331

The Hedjaz Meteorite: REE Abundances in Chondrules and Lithic Fragments
K. Misawa, N. Nakamura
  1332

Petrogenesis of Mafic Lithologies in Mesosiderites
D. W. Mittlefehldt
  1333

Different Formation Processes of the Moon, the Earth, and Meteorites
Y. Miura
  1334

Constraints on Cooling Histories of Ordinary Chondrites as Inferred From Chemical Zoning of Porphyritic Olivine
M. Miyamoto
  1335

Diffuse Reflectances 0.25 to 25 microns of an Enstatite Chondrite and Implications for Surface Minerals of M-Type Asteroids
M. Miyamoto
  1336

Scaling Law of Impact Fragmentation and Coagulation
H. Mizutani, S. Kawakami, Y. Takagi, T. Naide, M. Hayakawa
  1337

Silicon Isotope Systematics During Distillation
C. Molini-Velsko, T. K. Mayeda, R. N. Clayton
  1338

The 1984 Mauna Loa Eruption and Planetary Lava Flows
H. J. Moore
  1339

Giant Circular Structures in the Precambrian Shields as Evidences of Early Crust-Forming Processes on the Terrestrial Planets
V. M. Moralev, M. Z. Glukhovsky
  1340

Impact Driven Supply of Sodium and Potassium to the Atmosphere of Mercury
T. H. Morgan, A. E. Potter, H. A. Zook
  1341

Diffusion Coefficients of Cations and Oxygen in Synthesized Single Crystal Melilites and Their Implications to the Thermal History of Allende CAI
M. Morioka, H. Yurimoto, T. Igusa, H. Nagasawa
  1342

Detection of Parent Molecules in the 25-5 micron Spectrum of Comet Hally With the IKS-Vega Experiment
V. I. Moroz, M. Combes, J. P. Bibring, N. Coron, J. Crovisier, T. Encrenaz, J. F. Crifo, N. Sanko, A. Grigoriev, D. Bockelee-Morvan, R. Gispert, C. Emerich, J. M. Lamarre, F. Recard, V. Krasnopolsky, T. Owen
  1343

Ultramicrocrystalline Hematite: Properties and Occurrence on the Martian Surface
R. V. Morris, H. V. Lauer Jr., A. V. Murali, D. G. Agresti, J. A. Newcomb
  1344

Archean Anorthosites: Constraints on the Accumulation Process
D. A. Morrison, W. C. Phinney, D. E. MacZuga
  1345

Channels on Alba Patera, Mars: Evidence for Polygenic Eruptions
P. J. Mouginis-Mark, J. R. Zimbelman
  1346

Different Types of Dust Particles in Halley's Comet
L. M. Mukhin, E. N. Evlanov, M. N. Fomenkova, V. N. Khromov, J. Kissel, O. F. Prilutsky, B. V. Zubkov, R. Z. Sagdeev
  1347

Chemical and Isotopic Systematics of Deccan Traps, Western India: Evidence of Cyclic Volcanism and Discrete Magma Sources
A. V. Murali, J. J. Mahoney, J. D. MacDougall, S. S. Deshmukh, D. P. Blanchard
  1348

A Preliminary Process-Oriented Geologic History for Ganymede
S. L. Murchie, J. W. Head
  1349

Evidence for the Existence of Major Shear Zones on Ganymede
S. L. Murchie, J. W. Head
  1350

Origin and Evolution of Furrows in the Dark Terrain of Ganymede
S. L. Murchie, J. W. Head
  1351

Shear Zones on Ganymede: Global Nature and Effect on Grooved Terrain Formation
S. L. Murchie, J. W. Head
  1352

Nitrogen and Trace Elements in Muong Nong Tektites and Irghizites: Clues to Tektite and Impactite Formation
S. V. S. Murty, P. N. Shukla, P. S. Goel
  1353

Variations in Composition of Kimberlite Dike Matrix Examined With Mapping Spectrometer Data
J. F. Mustard, C. M. Pieters
  1354

Comparative Estimate of Viscosity Parameters of the Earth's Group Planets and Peculiarities of Their Tectonic Structures
V. P. Myasnikov, M. S. Markov, E. P. Timoshkina, Zh. F. Rodionova
  1355

Chondrules and Type B-1 CAIs Formed by the Same Heating Event
H. Nagahara
  1356

HN3-1 (Type B-1 CAI) Formed From Isotopically and Chemically Heterogeneous Interstellar Minerals and Condensates of the Solar System by Incomplete Melting
H. Nagahara, H. Nagasawa, N. Nakamura, T. Matsui
  1357

REE, Ba, Sr, Rb, and K Characteristics of Chondrules From the Tieschitz (H3) Chondrite
H. Nagamoto, Y. Nishikawa, K. Misawa, N. Nakamura
  1358

Rare Earth Distribution in the Allende Ca-Al-Rich Inclusion HN3-1
N. Nakamura, H. Nagasawa
  1359

Amount of Extraterrestrial Material in the K/T Boundary Sediments
M. A. Nazarov, D. D. Badjukov, L. D. Barsukova, A. S. Alekseev
  1360

Metal-Rich CAI's in Efremovka (C3)
M. A. Nazarov, F. Brandstaetter, A. A. Ulyanov, G. M. Kolesov, G. Kurat
  1361

Lunar Granite: an Enigma With a New Perspective
C. R. Neal, L. A. Taylor
  1362

Mare Basalt Evolution: The Influence of KREEP-Like Components
C. R. Neal, L. A. Taylor, M. M. Lindstrom
  1363

Petrology and Geochemistry of Highland Clasts From Apollo 14 Breccias 14303, 14305, and 14321
C. R. Neal, L. A. Taylor, M. M. Lindstrom
  1364

Very High Potassium (VHK) Basalt Petrogenesis: The Role of Granite and KREEP Components
C. R. Neal, L. A. Taylor, M. M. Lindstrom
  1365

Possible Formation of Carbonates in Ancient Lakes in the Valles Marineris, Mars: A Search of the Mariner 6/7 IRS Dataset
S. S. Nedell, C. P. McKay
  1366

Phosphates in Shergotty and EETA79001: Geochemistry and Petrogenesis
R. J. Nevle
  1367

Formation of the Moon and Terrestrial Planets: Constraints From V, Cr, and MN Abundances in Planetary Mantles and From New Partitioning Experiments
H. E. Newsom, M. J. Drake
  1368

TI Isotopes in Allende and Chainpur Chondrules and in the Kaidun Breccia
S. Niemeyer
  1369

Helium and Neon Isotopes in Extraterrestrial Particles
A. O. Nier, D. J. Schlutter, D. E. Brownlee
  1370

10Be Profiles in Lunar Surface Rock 68815
K. Nishiizumi, M. Imamura, C. P. Kohl, H. Nagai, K. Kobayashi, K. Yoshida, H. Yamashita, R. C. Reedy, M. Honda, J. R. Arnold
  1371

Long-Lived Cosmogenic Nuclides in the Derrick Peak and Lazarev Iron Meteorites
K. Nishiizumi, J. Klein, R. Middleton, J. R. Arnold
  1372

Experimental Studies of Pre-Solar Grain Analogs
J. A. Nuth, R. Nelson, M. Thiemens, B. Donn
  1373

The Origin and Significance of the Earliest Archean Nulliak (Supracrustal) Assemblage, Northern Labrador
A. P. Nutman, B. J. Fryer, D. Bridgwater
  1374

Isotopic Studies of Shergottite Chronology: II. Possible Effect of Contamination on the Sm-Nd System
L. E. Nyquist, B. M. Bansal, H. Wiesmann, C.-Y. Shih, G. McKay
  1375

Isotopic Studies of Shergottite Chronology: I. Effect of Shock Metamorphism on the Rb-Sr System
L. E. Nyquist, F. Hoerz, H. Wiesmann, C.-Y. Shih, B. Bansal
  1376

On the Stability of "Meteorite Swarms" in Resonant Orbits--A Preliminary Study
J. Oberst
  1377

Lunar Seismic Impact Clusters--Evidence for the Presence of "Meteorite Streams"
J. Oberst, Y. Nakamura
  1378

Interstitial Ca-Rich Silicate Materials in the Yamato Ureilites With Reference to Their Origin
H. Ogata, H. Takeda, T. Ishii
  1379

Partition Coefficients for REE and HF Between Zircon and Liquid: Inferences for Lunar Granite Petrogenesis
O. Okano, E. B. Watson, M. Tatsumoto
  1380

Nickel-Iron Spherules in a Lunar Glass Sphere
J. A. O'Keefe, R. Ganapathy
  1381

Impact Crater Maximum Depth of Penetration and Excavation
J. D. O'Keefe, T. J. Ahrens
  1382

Meteorite Impact and the Extinction of Solar Radiation
J. D. O'Keefe, T. J. Ahrens
  1383

Petrography of EET 83212,7 and EET 83229,7: A Comparison of 2 New Howardites
S. C. Okulewicz, J. S. Delaney
  1384

The Compositional Zoning of Feldspathic Phases in Allan Hills 77005,32
C. O'Neill, Y. Ikeda, J. S. Delaney
  1385

Solar Type He and NE in Diamonds
M. Ozima, S. Zashu
  1386

Formation of Feo-Bearing Olivines in Carbonaceous Chondrites by High Temperature Oxidation in the Solar Nebula
H. Palme, B. Fegley Jr.
  1387

FUN Isotopic Anomalies: Reincarnation in Purple Refractory Inclusions
D. A. Papanastassiou, C. A. Brigham
  1388

Rayleigh Distillation Constraints on MG Isotopic Compositions
D. A. Papanastassiou, G. J. Wasserburg
  1389

Sm-Nd Systematics in Coarse-Grained Refractory Inclusions From Allende
D. A. Papanastassiou, H. H. Ngo, G. J. Wasserburg
  1390

CaAl4O7 From Allende Type A Inclusion NMNH 4691
J. M. Paque
  1391

A Finite Amplitude Necking Model for the Formation and Evolution of Rift Zones: Application to the Beta Regio Rift
E. M. Parmentier, E. R. Stofan, J. W. Head
  1392

Three-Body Resonance Trapping and the Asteroid Belt
C. W. Patterson
  1393

Volatile/Mobile Trace Elements in Eucrites--I. Antarctic/Non-Antarctic Comparisons
R. L. Paul, M. E. Lipschutz
  1394

Erosion of Mercury Silicate Shell During its Accumulation
G. V. Pechrnikova, A. V. Vitjazev
  1395

Very High Track-Densities in Forest Vale (H4) Merrillites: Was Cm248 Alive in the Early Solar System?
P. Pellas, C. Perron, M. Bourot-Denise, C. Fieni, M. Ghelis, G. Crozaz
  1396

Anorthosites: an Analogue Study
W. C. Phinney, D. A. Morrison, D. E. MacZuga
  1397

Stratigraphy and Evolution of the Lunar Highland Crust: A Sampling of Vertical and Regional Heterogeneities
C. M. Pieters
  1398

Information Content of Planetary Terrain: Varied Effectiveness of Parameters for the Earth
R. J. Pike
  1399

Toward Geometric Signatures for Planetary Terrain: an Assessment of Earth at 1:24,000 Scale
R. J. Pike
  1400

Spatial Distribution of Circular Features on Venus
J. J. Plaut, R. E. Arvidson
  1401

Cratering History of Miranda
J. B. Plescia
  1402

Cratering History of Umbriel, Titania, and Oberon
J. B. Plescia
  1403

Geology and Cratering History of Ariel
J. B. Plescia
  1404

Late-Stage Flood Lavas in the Elysium Region, Mars
J. B. Plescia
  1405

Planetary Wrinkle Ridges--Low-Angle Thrust Faults
J. B. Plescia, M. P. Golombek
  1406

Shocked Calcite From an Explosion Crater--Electron Paramagnetic Resonance
C. A. Polanskey, T. J. Ahrens
  1407

The Use of Anhysteretic and Rotational Remanent Magnetizations in Detecting Fine Iron Particles
D. K. Potter, A. Stephenson
  1408

Characterization of Surficial Units in the Central Equatorial Region of Mars
M. A. Presley, R. E. Arvidson, P. R. Christensen
  1409

Bencubbin, Kakangari, Tucson and Renazzo: A Speculative Connection Between Some of Their Major Components
M. Prinz, M. K. Weisberg, C. E. Nehru, J. S. Delaney
  1410

EET 83309, A Polymict Ureilite: Recognition of a New Group
M. Prinz, M. K. Weisberg, C. E. Nehru, J. S. Delaney
  1411

Search for Correlated Isotopic Effects in Allende CAls: II. Comparison With Mineralogical Data
C. A. Prombo, A. Hashimoto, J. L. Birck, G. W. Lugmair, L. Grossman
  1412

Ancient Oceanic Crust Subducted Beneath the Kaapvaal Craton: The Genesis of Eclogites in Kimberlites
B. Pyle, C. R. Neal, L. A. Taylor
  1413

Dynamic Crystallization Experiments on an Average Type I (MgO-Rich) Chondrule Composition
P. M. Radomsky, R. H. Hewins
  1414

Fe3+ in Impact Glasses and Tektites
A. I. Raikhlin, A. D. Kirikov, V. S. Kozlov
  1415

Circular Mare Ridges
J. Raitala
  1416

Highland Wrinkle Ridges on Mars
J. Raitala
  1417

Thrust and Strike-Slip Faulting in Mare Ridge Tectonics
J. Raitala
  1418

Neutron Capture Effects in Asteroidal Regoliths
R. S. Rajan, G. W. Lugmair
  1419

Cosmogenic Nuclide Production in Small Metallic Spherules
R. C. Reedy
  1420

Solar-Proton-Produced Nuclides in Meteorites
R. C. Reedy
  1421

Coupled Neutron/Gamma-Ray Spectroscopy From Lunar Orbit
R. C. Reedy, D. M. Drake, W. C. Feldman, E. L. Haines, A. E. Metzger
  1422

Fracture Density Statistics Along Radial Traverses Through the Crystalline Basement of the Vredefort Dome, South Africa
W. U. Reimold
  1423

INAA and Rb-Sr Isotope Analysis of Lake St. Martin Melt and Country Rocks
W. U. Reimold, J. M. Barr, R. A. F. Grieve, M. Tredoux
  1424

A Multi-Stage, Long-Term Evolution of the Vredefort Dome, South Africa-As Suggested by 40Ar-39Ar Dating of Pseudotachylite
W. U. Reimold, E. K. Jessberger, T. Stephan
  1425

Chondritic Interplanetary Dust and Primitive Chondrite Matrices: The Search for Chemically Pristine Solids in the Solar System
F. J. M. Rietmeijer
  1426

Formation of High-Temperature Minerals by Annealing of Amorphous, Low-Temperature Anhydrous Chondritic Interplanetary Dust
F. J. M. Rietmeijer
  1427

Silicone Oil: A Persistent Contaminant in Chemical and Spectral Micro-Analyses of Interplanetary Dust Particles
F. J. M. Rietmeijer
  1428

Gordian Knots and Lunar Origin
A. E. Ringwood
  1429

Shock Metamorphism at the Vredefort Structure, South Africa: Evidence for a Single Shock Event
P. B. Robertson, R. A. F. Grieve, J. Alexopoulos, J. Coderre
  1430

A Search for a Relationship Between Greenland Cosmic Dust Grains
E. Robin, Ph. Bonte, C. Jehanno
  1431

A Micrometeorite "Spectrum" for the Mass Distribution of Well Preserved Greenland Cosmic Dust Grains
E. Robin, C. Jehanno, M. Maurette
  1432

The Density Distribution of Lunar Craters of Different Degrees of Rim Sharpness and Completeness
Zh. F. Rodionova, V. V. Shevchenko, A. A. Karlov, T. F. Smolyakova
  1433

Cryptic Variation in Cumulate Dunites From Blow ME Down Mountain, Newfoundland
D. K. Ross, D. Elthon, J. F. Casey
  1434

Fracture Patterns on Earth and Mars: Pattern Genesis and Analysis
L. A. Rossbacher, D. Melendrez
  1435

Modification Styles of the Martian Impact Craters
L. E. Roth, R. S. Saunders, T. W. Thompson
  1436

Reflectance Spectra of Selected Mafic Silicates From .6 to 4.6 microns
T. L. Roush, R. B. Singer, T. B. McCord
  1437

Reflectance Spectra of Selected Phyllosilicates From .6 to 4.6 microns
T. L. Roush, R. B. Singer, T. B. McCord
  1438

The Spectral Reflectance, 0.6 to 4.3 microns, of Particulate Mineral-Water Ice Mixtures
T. L. Roush, R. B. Singer, T. B. McCord
  1439

The Ningqiang Carbonaceous Chondrite and the Origin of Aggregational and Granoblastic Chondrules
A. E. Rubin, D. Wang, G. W. Kallemeyn
  1440

Apollo 15 Olivine-Normative Mare Basalts: New Chemical Analyses, Chemical Dispersion, and Chemical Relationships
G. Ryder, A. Steele
  1441

A Test of the Accuracy of the Preliminary Macroscopic Identification of Lunar Coarse-Fine Particles: INAA and Petrographic Studies of 2-4 MM Particles From the Apennine Front
G. Ryder, M. M. Lindstrom, K. Willis
  1442

Chondrules and Matrix in the Ornans CO3 Chondrite: Possible Precursor Components
A. E. Rubin, J. T. Wasson
  1443

Primeval Lunar Satellites
S. K. Runcorn
  1444

Library of Mineral and Rock Spectra in the Thermal-Infrared (2.1-25.0 microns): Implications for Observations of Fine Particulate Planetary Surfaces
J. W. Salisbury, L. S. Walter, N. Vergo
  1445

Trace-Element Distributions Among Subunits of a Stillwater Anorthosite Boulder
P. A. Salpas, L. A. Haskin, I. S. McCallum
  1446

Is the Venusian Surface Really Old?
G. G. Schaber, E. M. Shoemaker, R. C. Kozak
  1447

Dark Ray and Dark Floor Craters on Ganymede
P. M. Schenk, W. B. McKinnon
  1448

Preliminary Scaling Results for Crater Rim-Crest Diameter
R. M. Schmidt
  1449

A Field Geologist's Return to the Moon
H. H. Schmitt
  1450

Oxidation-Reduction Chemistry in Diopside-Albite Melts
H. D. Schreiber, K. K. McManus, S. A. Settle
  1451

Exposure Ages of Basaltic Achondrites and Implications for the Stratigraphy of Their Parent Body
L. Schultz
  1452

Impact Velocity and Changes in Crater Shape, Morphology, and Statistics
P. H. Schultz
  1453

Impact Vaporization by Low-Angle Impacts
P. H. Schultz, D. Crawford
  1454

Transition Diameters for Crater Shape in Laboratory Experiments and on Planets
P. H. Schultz, D. E. Gault
  1455

Why do Lunar Normal Faults Propagate Upward?
R. A. Schultz
  1456

AMLAMP (Antarctic Meteorite Location and Mapping Project): A Progress Report
J. Schutt, W. A. Cassidy, B. W. Fessler
  1457

Preliminary Description of Double Drive Tube 79002/79001
C. Schwarz
  1458

Accretionary Processes: Clues From Chondrites
E. R. D. Scott, G. J. Taylor
  1459

Formation of Agglutinate-Like Particles in an Experimental Regolith
T. H. See, F. Hoerz, M. J. Cintala, S. Smrekar, F. Cardenas
  1460

Interior Models of Io and the Surface Distribution of Hot Spots
M. Segatz, T. Spohn
  1461

Metal-Silicate Partition Coefficients for Some Volatile Siderophile Elements and Implications for Lunar Origin
S. Seifert, A. E. Ringwood
  1462

Petrochemical Trends of Crystallized Impact Melts
T. V. Selivanovskaya
  1463

Characterization of the Venus Equatorial Highlands Using Pioneer Venus Imaging Mode Data
D. A. Senske, J. W. Head
  1464

Onset of Tectonic Rille Development in Southern Mare Serenitatis: Evidence for Incomplete Pre-Mare Isostatic Compensation?
V. L. Sharpton
  1465

Lunar Boron: A Preliminary Study
D. M. Shaw, T. A. Middleton
  1466

Diagram Albedo-Color of Venus Surface According to Venera-13 Data
Yu. G. Shkuratov, M. A. Kreslavsky, O. V. Nikolayeva
  1467

On Spectral Albedo of PHOBOS and Deimos in UV-Range
Yu. G. Shkuratov, N. P. Stunkevich, I. I. Antipova-Karataeva
  1468

Crater Production on Venus and Earth by Asteroid and Comet Impact
E. M. Shoemaker, R. F. Wolfe
  1469

The Duolun Impact Crater, China
W. Siben
  1470

Petrology of a Low-Titanium Mare Basalt From Apollo 16 Regolith Breccia 60255
S. B. Simon, J. J. Papike
  1471

Petrology of the Apollo 15 Apennine Front I: Impact Melt Rocks
S. B. Simon, J. J. Papike
  1472

Petrology of the Apollo 15 Apennine Front II: Plutonic Rocks and KREEP Basalts
S. B. Simon, J. J. Papike
  1473

Apollo 16 Regolith Breccias and Soils: Comparative Petrology and Chemistry
S. B. Simon, J. J. Papike, J. C. Laul, S. S. Hughes, R. A. Schmitt
  1474

Some Peculiarities of Mercurial Crater Distribution and the Research of Craters With Intersecting Rims
T. P. Skobeleva
  1475

Venus: Improved Spin Vector From Goldstone Radar Observations
M. A. Slade, S. Zohar, R. F. Jurgens
  1476

Viking Orbiter Multispectral Images Linked to Lander Images and Laboratory Analogs
M. O. Smith, J. B. Adams, E. A. Guinness, R. E. Arvidson
  1477

Iron Oxidation State and Weathering Studies of SNC and Other Antarctic Meteorites
T. C. Solberg, R. G. Burns
  1478

The Abundance and Distribution of Be in Allende Inclusions
A. J. Spivack, H. Gnaser, J. R. Beckett, C. I. Measures, I. D. Hutcheon, G. J. Wasserburg
  1479

Paleogeologic Maps of Mercury's Surface
P. D. Spudis, J. E. Guest
  1480

The Use of Basin Ejecta to Determine Lunar Crustal Structure and Composition: Current Models and LGO Contributions
P. D. Spudis, B. R. Hawke
  1481

Accretional Heating of the Satellites of Saturn and Uranus
S. W. Squyres, R. T. Reynolds, A. L. Summers, F. Shung
  1482

Mineralogic Evidence for Pre-Chondrule Nebular Conditions
I. M. Steele, J. V. Smith
  1483

Development of Space-Based Containerless Coating Processes
L. D. Stephenson, A. Smith, J. M. Rigsbe, V. F. Hock
  1484

Cometary Capture Rates and Extra-Solar Oort Cloud Encounters
S. A. Stern
  1485

Two Important Mechanisms Contributing to Cometary Evolution in the Oort Cloud
S. A. Stern
  1486

Nature and Sequence of Volcanic and Tectonic Activity in Beta Regio, Venus
E. R. Stofan, J. W. Head, D. B. Campbell, S. H. Zisk, A. F. Bogomolov, A. T. Basilevsky, N. Armand
  1487

Corona Structures on Venus: Models of Origin
E. R. Stofan, J. W. Head, E. M. Parmentier
  1488

Morphographic Projections for Maps of Non-Spherical Worlds
P. J. Stooke, C. P. Keller
  1489

Color/Albedo Provinces and Surficial Units of the Central Equatorial Region of Mars: Definitions and Methods
E. L. Strickland III
  1490

Latitude and Altitude Dependent Dust Opacity Variations and Their Effects on Martian Surface Observations
E. L. Strickland III
  1491

Mars-Rocks on Phobos? and a Possible Solution to the SNC Meteorite Abundance Problem
E. L. Strickland III
  1492

New Features Named on the Moon and Uranian Satellites
M. E. Strobell, H. Masursky
  1493

The Solar System Cratering Record: Voyager 2 Results at Uranus and Implications for the Origin of Impacting Objects
R. G. Strom
  1494

Lunar Geoscience Observer Mission Overview
F. M. Sturms Jr.
  1495

The Development of a Zirconia Cell for Generating Oxygen From the Martian Atmosphere
J. W. Suitor, J. E. Schroeder, R. H. Steinbacher
  1496

Parquet on Venus: Areas of Regional Deformations
A. L. Sukhanov
  1497

Ridged Belts on Venus: Compression or Extension?
A. L. Sukhanov
  1498

"Spiders" on Venus: Ring Complexes
A. L. Sukhanov
  1499

Quantitative Evaluation of Ballistic Sedimentation
R. Sullivan
  1500

Trace Element Contents of Eucritic Plagioclase Determined by Synchrotron X-Ray Fluorescence
S. R. Sutton, J. S. Delaney, J. V. Smith, M. Prinz
  1501

I-Xe Studies of Semarkona Chondrules: Dating Alteration
T. D. Swindle, J. N. Grossman
  1502

Xenon and Argon in Nakhla and Lafayette: Evidence for Multiple "Martian" Components
T. D. Swindle, D. H. Garrison, C. M. Hohenberg, C. T. Olinger
  1503

A Rb-Sr Age of an Impact Melted Sample in Lunar Meteorite
K. Takahashi, A. Masuda
  1504

CE Anomaly Shown in Lunar Highland Samples: an Examination From REE Abundances and Rb-Sr Systematics for Lunar Meteorites
K. Takahashi, A. Masuda
  1505

Mineralogy of New Lithic Clasts in Polymict Eucrites and Possible Crystallization of Diogenite From a Eucritic Melt
H. Takeda, T. Aoyama
  1506

Mineralogy of Dominant Clasts in Lunar Regolith Breccia 60019 and Comparison to Yamato Lunar Meteorites
H. Takeda, H. Mori, T. Tagai, M. Miyamoto
  1507

History and Morphology of Faulting in the Noctis Labyrinthus-Claritas Fossae Region of Mars
K. L. Tanaka, P. A. Davis
  1508

Development of the Chryse Hydrologic System, Mars
K. L. Tanaka, D. J. MacKinnon
  1509

Eruptive History of the Elysium Volcanic Province of Mars
K. L. Tanaka, D. H. Scott
  1510

The Lunar Geoscience Observers Role in Unraveling the Magmatic Evolution of the Moon
G. J. Taylor
  1511

Loss of Volatile Elements During Impact Events in Relation to Lunar Composition and Origin
S. R. Taylor
  1512

Isotopic and Petrologic Investigation of the Eucrites Cachari, Moore County and Stannern
F. Tera, R. W. Carlson, N. Z. Boctor
  1513

Demonstration of a Mass Independent Isotopic Fractionation in CO Reaction
M. H. Thiemens, D. Meagher
  1514

Evolution of Asteroid Taxonomy
D. J. Tholen, J. F. Bell
  1515

Limb Topography of Uranian Satellites
P. Thomas
  1516

Non-Newtonian Diapirism in the Icy Satellites
P. J. Thomas, G. Schubert
  1517

Non-Newtonian Ice Rheology and the Retention of Craters on Ganymede
P. J. Thomas, G. Schubert
  1518

The Viscosity of Miranda
P. J. Thomas, R. T. Reynolds, S. W. Squyres, P. M. Cassen
  1519

Goldstone Radar Observations of Mars: The 1986 Opposition
T. W. Thompson
  1520

Ultra-High Resolution Radar Mapping of the Moon at 70 CM Wavelength
T. W. Thompson
  1521

Geology of the Nakhlite Meteorites: Cumulate Rocks From Flows and Shallow Intrusions
A. H. Treiman
  1522

Passive Hypervelocity Noble-Gas Capture Experiments
P. Tsou, T. Bernatowicz, D. Burnett, A. Chutjian, P. Eberhardt, R. Mawhorter, M. Neugebauer, A. Albee
  1523

Hypervelocity Intact Capture in Multiple-Layer Films
P. Tsou, S. T. J. Peng, A. L. Albee
  1524

Tectonic Implications of Radiogenic Noble Gases in Planetary Atmospheres
D. L. Turcotte, G. Schubert
  1525

Effect of Shock on the Kinetics of Thermally-Induced Dehydration of Serpentine
J. A. Tyburczy, T. J. Ahrens
  1526

Fe-Cr-Ni Inclusion in the Shock-Metamorphosed Quartzite of the Terny Astrobleme
A. A. Valter, V. V. Burmistrova, O. P. Sharkin
  1527

Carbon in Dark Clasts of Allende
C. C. A. H. van der Stap, D. Heymann, R. D. Vis, H. Verheul
  1528

Simultaneous Measurements of C, Ni, and P in the Toluca and Algarrobo Iron Meteorites
C. C. A. H. van der Stap, D. Heymann, R. D. Vis, H. Verheul
  1529

Effects of the Solar System Oscillations About the Galactic Plane on the Cosmogenic Nuclide Production in Meteorites
V. Vanzani, S. Sartori, C. Tuniz, B. M. Stievano, F. Marzari
  1530

Petrology of Mare Basalt and Highland Clasts From Breccia 15498
S. Vetter, J. Shervais, M. M. Lindstrom
  1531

Orbital Evolution of the Vapor Jet From a Giant Impact
A. M. Vickery, H. J. Melosh
  1532

When the Gas was Removed From the Zone of Terrestrial Planets?
A. V. Vitjazev, G. V. Pechernikova
  1533

Maxwell Montes, Venus: Geological Unit Map From Arecibo and Venera Data Sets and Evidence of Deformation History
R. W. Vorder Bruegge, J. W. Head, D. B. Campbell
  1534

Are IDPs and Halley Dust Similar and, If So, So What?
R. M. Walker
  1535

LGO Mission and Science Summary
R. A. Wallace
  1536

Spectral Variations in the Thermal Infrared Reststrahlen Band of Silicates
L. S. Walter, J. W. Salisbury, N. Vergo
  1537

Origin of CAI Rims-II: The Evidence From Refractory Metals, Major Elements and Mineralogy
D. A. Wark, W. V. Boynton
  1538

A Trio of Meteoritic Dunites, and New Data for Shergotty
P. H. Warren, G. W. Kallemeyn
  1539

Estimated Average Siderophile Element Contents of the Pristine Lunar Crust
P. H. Warren, E. A. Jerde, G. W. Kallemeyn
  1540

"New" Lunar Regolith Breccias; an Enigmatic Ferroan Anorthosite From Apollo 14
P. H. Warren, E. A. Jerde, R. V. Morris
  1541

A Multiple-Impact Origin of Southeast Asian Tektites
J. T. Wasson
  1542

The Volcanic Plains Ridges of the Chryse and Amazonis Depressions
T. R. Watters
  1543

Characterization of Interplanetary Dust Particles From Antarctic Ice Samples
S. J. Webb, M. E. Zolensky
  1544

Orbital Resonances in the Solar Nebula: Timescales and Resonance Widths
S. J. Weidenschilling, D. R. Davis
  1545

Post-Perihelion Brightening of Halley's Comet: Spring Time for Halley
P. R. Weissman
  1546

Ancient Apollo 16 Regolith Breccias: Glass Populations and High Mg' Glass
S. J. Wentworth, D. S. McKay
  1547

Glasses in Apollo 15 Regolith Breccias
S. J. Wentworth, D. S. McKay
  1548

Ratio of Asteroidal Impact Rates on Mars and Earth
G. W. Wetherill
  1549

Factors Controlling Early Runaway Growth of Planetesimals
G. W. Wetherill, G. R. Stewart
  1550

Volcanic and Tectonic Evolution of Martian Impact Basins
R. Wichman, P. H. Schultz
  1551

Noble Gases in the Meteorite Fayetteville and in Lunar Ilmenite Originating From Solar Energetic Particles
R. Wieler, H. Baur, J. P. Benkert, A. Pedroni, P. Signer
  1552

CO2 and Noble Gas Emplacement Into Basalt by Artificial Shock; Relevance to EETA79001 Trapped Gas
R. C. Wiens
  1553

Uplands/Knobby-Terrain Relation on Mars
D. E. Wilhelms, R. J. Baldwin
  1554

Lunar Science From Lunar Laser Ranging
J. G. Williams, X. X. Newhall, J. O. Dickey
  1555

Particle Speed and Concentration in the Saltation Cloud: Full Saltation Development and Choking
S. H. Williams, R. Greeley
  1556

Project Leap: Lunar Ecosystem and Architectural Prototype
F. Winisdoerffer, J. Brown, S. Ximenes
  1557

Polymict Impact Breccias on the Eucrite Parent Body: II. Accessory Minerals in Lithic Clasts and Breccia Matrix of Eucrite-Howardite Meteorites
C. Wohrmeyer, D. Stoffler
  1558

PHOBOS & Deimos: Comets, Asteroids or Left Over Pieces of Mars?
C. A. Wood
  1559

Rotation Periods of Halley's and Other Comets
C. A. Wood
  1560

Venus Lives! (probably)
C. A. Wood, P. Francis
  1561

Was Chondritic Material Formed During Large-Scale, Protracted Nebular Evolution or by Transient Local Events in the Nebula?
J. A. Wood
  1562

Raman Observations of Individual Interplanetary Dust Particles
B. Wopenka
  1563

A Statistical Study of Mercurian Crater Classes Applied to the Emplacement of the Intercrater Plains
A. Woronow, K. Love
  1564

Carbonates in EETA 79001: Terrestrial or Martian?
I. P. Wright, M. M. Grady, C. T. Pillinger
  1565

Digital Presentation of Mars Topography
S. S. C. Wu, A. E. Howington
  1566

Topographic Map of Miranda
S. S. C. Wu, F. J. Schafer, R. Jordan, A. E. Howington
  1567

The Role of the Vaporization and Dissipation Processes in the Lunar History
O. I. Yakovlev, O. M. Markova, B. M. Manzon
  1568

Japanese Collection of Antarctic Meteorites
K. Yanai, H. Kojima
  1569

Specular Reflections and the Nature of Particle Surface Interactions
S. A. Yon, C. M. Pieters
  1570

Gila Observatory: Serious Solar System Research at the High School Level
K. W. Zeigler
  1571

Mars: Detection of Regolith H2O Sources From Space
A. P. Zent, F. P. Fanale, S. E. Postawko
  1572

Noble Metals and Other Siderophile Elements at the Precambrian-Cambrian Boundary at Zunyi, Guizhou, China
L. Zhou, F. T. Kyte
  1573

Triple-Junction Rifting and Detachment Surfaces Near the Pele Volcano on Io
J. R. Zimbelman, K. Burke
  1574

A Possible Volcanic Component in the Fine-Grained Materials Near Alba Patera, Mars
J. R. Zimbelman, P. J. Mouginis-Mark
  1575

High-Resolution Thermal Inertias at Equatorial Latitudes on Mars
J. R. Zimbelman, L. A. Leshin, K. S. Edgett, S. Skinner
  1576

New Very-High-Resolution Lunar Radar Measurements at 3. 0 CM Wavelength: Initial Maps of the Hadley/Apollo 15 Area
S. H. Zisk, P. J. Mouginis-Mark, G. H. Pettengill, T. W. Thompson
  1577

Tochilinite in C2 Carbonaceous Chondrites: A Review With Suggestions
M. E. Zolensky
  1578

Redox Conditions on Venus Surface
M. Yu. Zolotov
  1579

Stability of Scapolites on Venus Surface
M. Yu. Zolotov, I. L. Khodakovsky, E. F. Westrum Jr.
  1580

The Velocity Distribution and Angular Directionality of Meteoroids That Impact on an Earth-Orbiting Satellite
H. A. Zook
  1581

Venus Tectonics: On the Relationship of Isostatic Topography to the Wavelengths of Surface Deformational Features
M. T. Zuber, E. M. Parmentier
  1582