Fourteenth Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

Consortium 67915: Ages and Composition of Troctolitic Anorthosites and Sodic Ferrogabbro Clasts
U. Aeschlimann, P. Eberhardt, J. Geiss, N. Groegler, D. Jost, M. S. Ma, K. Marti, R. Schmitt, J. Taylor 		  1001

The Permian-Triassic Boundary Event: Geochemical Investigation of the Transcaucasia Section
A. S. Alekseev, L. D. Barsukova, G. M. Kolesov, M. Nazarov, A. G. Grigoryan 		  1002

Chemistry of the Primitive Mantle
D. L. Anderson 		  1003

On the Concentration of Minor Components in the Nearsurface Venus' Atmosphere: Physico-Chemical Implication
N. E. Andreeva, V. P. Volkov, Yu. I. Sidorov, I. L. Khodakovsky 		  1004

A Model of Magmatic Differentiation and Possibility of its Application to Petrogenesis of Lunar Highland Rocks
A. A. Ariskin, M. Ya. Frenkel, A. A. Yaroshevsky 		  1005

MG Isotopic Systematics in the Allende Inclusion Wa: Panurge Takes a Second Look
J. T. Armstrong, G. J. Wasserburg 		  1006

Cratering Motions and Material Descriptions for Prairie Flat/dial Pack Surface-Burst Explosion Craters in Wet, Unconsolidated Alluvium
M. G. Austin 		  1007

Auras and io Regolith Outgassing by Sulphur Flows
S. M. Baloga, D. L. Matson, D. C. Pieri 		  1008

Palagonites VS. Smectites as Possible Mars Soil Analogs
A. Banin, L. Margulies 		  1009

The Mineral Composition of Rocks at the Landing Sites of Venera 13 and Venera 14 Descending Modules: Thermodynamic Calculations
V. L. Barsukov, I. L. Khodakovsky, V. P. Volkov, Yu. I. Sidorov, M. V. Borisov 		  1010

Petrography, Morphology and Distribution of Sizes of the Chondrules from the Kainsaz Carbonaceous Chondrite (C30)
G. V. Baryshnikova, Yu. I. Stakheev, G. G. Rukhman, A. K. Lavrukhina 		  1011

Correlation of Venus Surface Roughness with the Terrain Altitude and General Slopes: New Approach to Analysis of Pioneer-Venus and Earth-Based Radar Data
A. T. Basilevsky, V. P. Kryuchkov, Yu. G. Shkuratov, Yu. V. Korniyenko, D. G. Stankevich 		  1012

Size-Composition Relationships in Green and Orange Lunar Glasses
A. Basu 		  1013

Preliminary Modal Petrology of Apollo 16 Double Drive Tube Core 64001
A. Basu, D. S. McKay, G. Nace 		  1014

Recent Comet Impacts on the Moon?
J. F. Bell, B. R. Hawke 		  1015

Xe on Shales: the "plastic Bag" Experiment
T. J. Bernatowicz, F. A. Podosek, M. Honda, F. E. Kramer 		  1016

15445 and 15455: Origin and Preliminary Age Data
M. L. Bernstein 		  1017

Observations of Craters with Domed Central Pit on Ganymede
R. Bianchi, S. Pozio 		  1018

The "C.O.M.E.T." Experiment (collecte EN Orbite de Matier Extraterrestre)
J.-P. Bibring, J. Borg, Y. Langevin, F. Rocard, B. Vassent 		  1019

A Critical Review of the Evidence Concerning the Depth of the Mare Basalt Magma Source Region
A. B. Binder 		  1020

Lunar Stress History, Part 1: Global Thermoelastic, Tidal, and Synchronous Rotational Stresses
A. B. Binder 		  1021

Evidence for an Initially Totally Molten Moon: Young Thrust Fault Scarps in the Highlands
A. B. Binder, H.-C. Gunga 		  1022

Evidence for an Initially Totally Molten Moon: Shallow Moonquakes with Kilobar Stress Drops
A. B. Binder, J. Oberst 		  1023

Ca-Al Chondrules and Inclusions in Ordinary Chondrites Evidence for a Related Genesis of Ordinary and Carbonaceous Chondrites
A. Bischoff, K. Keil 		  1024

Clast Population Statistics of Fragmental Breccias, North Ray Crater, Apollo 16: Implications for the Descartes Formation
A. Bischoff, D. Stoffler, R. Borchardt, A. Rehfeldt 		  1025

Trace Element Zoning in Coexisting Chromite/ulvospinel in Apollo 12 Samples - Analyzed by a Proton Beam Microanalyzer
H. Blank, A. El Goresy, J. Janicke, R. Nobiling, K. Traxel 		  1026

Martian Atmospheric Gases Trapped in the EETA79001 Shergottite?
D. D. Bogard, P. Johnson 		  1027

Trapped Solar Gases in the ALHA81005 LUNAR(?) Meteorite
D. D. Bogard, P. Johnson 		  1028

The Role of Crystalline Defects in the Distribution of Metallic Particles in Olivine: Meteoritic Implications
J. N. Boland, A. Duba 		  1029

Are the Descartes and Cayley Formations at Apollo 16 Characterized by Different Impact Melt Lithologies?
R. Borchardt, D. Stoffler, A. Bischoff, W. U. Reimold 		  1030

Sputter-Induced Atmosphere and Molecular Ejection on IO
J. W. Boring, J. W. Garrett, E. Sieveka, R. E. Johnson, W. L. Brown, L. J. Lanzerotti 		  1031

Shock-Melting and Vaporization of Anorthosite and Implications for an Impact-Origin of the Moon
M. B. Boslough, T. J. Ahrens 		  1032

On the Formation of the Presolar Nebula from a Multiple Protostellar System
A. P. Boss 		  1033

Mineralogy and Crystal Chemistry of CP Micrometeorites
J. P. Bradley, D. E. Brownlee 		  1034

Intrinsic Oxygen Fugacity Measurements of 7 Chondrites and a Pallasite, and Redox State of Meteorite Parent Bodies
R. Brett, M. Sato 		  1035

Partitioning of cr, mn, V and NI Between fe Melt, Magnesiowuestite and Olivine at High Pressures and Temperatures
G. Brey, H. Wanke 		  1036

The Relative Frequency of Small CI Meteoroids
D. E. Brownlee, M. Wheelock, J. P. Bradley 		  1037

Allende Dark Inclusions: Samples of Primitive Regoliths
T. E. Bunch, S. Chang 		  1038

Ice-Bearing Permafrost on Mars Upper Boundary Depth: Connection with Topography
G. A. Burba, R. O. Kuzmin, V. P. Shashkina 		  1039

T-Environmental Changes: Se-Germany
P. J. Burek, J. D. Arneth 		  1040

Chemistry of Shergottites and the Shergotty Parent Body (spb): Further Evidence for the Two Component Model of Planet Formation
A. Burghele, G. Dreibus, H. Palme, W. Rammensee, B. Spettel, G. Weckwerth, H. Wanke 		  1041

Spectral Chemistry of Green Glass-Bearing 15426 Regolith
R. G. Burns, M. D. Dyar 		  1042

Apparent Volcanic Cycles in the Archean Swaziland Supergroup, Barberton Mountain Land, South Africa: a Result of Non-Magma Processes
G. R. Byerly, D. R. Lowe, B. W. Nocita, B. L. Ransom 		  1043

Cosmogenic Neon from Pre-Compaction Irradiation of Murchison and Kapoeta
M. W. Caffee, J. N. Goswami, C. M. Hohenberg, T. D. Swindle 		  1044

Behavior of the Sun during Growth from the Primitive Solar Nebula
A. G. W. Cameron, J. A. Mercer-Smith 		  1045

Fluorine and Chlorine Variations in an Island Arc Basalt Suite
J. A. Canepa, C. B. Moore 		  1046

Geology of Galileo Regio, Ganymede
R. Casacchia, R. G. Strom 		  1047

Prospects for Future Meteorite Recoveries on the Antarctic Ice Sheet
W. A. Cassidy 		  1048

Tidal Effects on Saturn Ring Particles: Implications for Ring Evolution
C. R. Chapman, D. R. Davis, S. J. Weidenschilling, R. Greenberg 		  1049

Fe-Pt Alloy Capsules for High Pressure-Experiments
H.-K. Chen, D. J. Andersen, D. H. Lindsley 		  1050

Apollo 14 Very Low Titanium Liquids: Behavior of Iron-Rich Liquids at High Pressures and Temperatures
H.-K. Chen, D. H. Lindsley 		  1051

The Abundances of AG and CD Isotopes in Iron Meteorites
J. H. Chen, G. J. Wasserburg 		  1052

The Least Radiogenic PB in Iron Meteorites
J. H. Chen, G. J. Wasserburg 		  1053

Basin Control of Ridge Patterns on Mars
A. Chicarro, P. H. Schultz, P. Masson 		  1054

Comparison of Radar and Thermal Properties of Mars
P. R. Christensen 		  1055

The Distribution of Rocks on Mars
P. R. Christensen 		  1056

Mineralogy and Microstructure of Some C-Type Interplanetary Dust Particles as Determined by Analytical Electron Microscopy
R. Christoffersen, P. R. Buseck 		  1057

Galim, an Unusual Enstatite-Chondrite
M. Christophe-Michel-Levy, M. Bourot-Denise 		  1058

Lunar Sample Magnetic Stratigraphy
S. M. Cisowski, M. Fuller 		  1059

Correspondence of Shergottites and Martian Fines
B. C. Clark 		  1060

A Look at the Major Terrains of Mercury Through Radar Profiles
P. E. Clark 		  1061

Kinetics of Ice Grain Growth: Implications for Remote Sensing of Planetary Surfaces
R. N. Clark, F. P. Fanale, A. P. Zent 		  1062

New "fun" Inclusions from Allende
R. N. Clayton, T. K. Mayeda, I. D. Hutcheon, C. Molini-Velsko, L. Grossman, A. El Goresy 		  1063

Oxygen Isotope Groups in Iron Meteorites
R. N. Clayton, T. K. Mayeda, E. J. Olsen, M. Prinz 		  1064

Morphometric Analysis and the Origin of Martian Tributary Networks
R. H. Clegg, H. Frey 		  1065

Phyllosilicates in Refractory Inclusions in the Mokoia C3(V) Chondrite
R. E. Cohen, A. S. Kornacki 		  1066

U-Pb Geochronology of Zircons from Breccia 73217 Using a Sensitive High Mass-Resolution Ion Microprobe (shrimp)
W. Compston, I. S. Williams 		  1067

Equilibrium Structure of Satellitary Disks
A. Coradini, G. Magni 		  1068

On the Siting of Noble Gases in Silicate Inclusions of the EL Taco Iron Meteorite
J. Crabb 		  1069

The Improbability of Viscous Relaxation on Icy Satellites
S. K. Croft 		  1070

On the Origin of Palimpsests on Icy Satellites
S. K. Croft, R. Ladbury 		  1071

Allan Hills 78084: Atmospheric Ablation and Preatmospheric Size Deduced from Cosmic Ray Tracks
G. Crozaz 		  1072

Where does Brachina Come From?
G. Crozaz, P. Pellas 		  1073

Chain Periodicity Faults in Pyroxferroite from Lunar Basalt 12021
M. Czank, F. Liebau 		  1074

Asteroid Collisions; Effective Body Strength and Efficiency of Catastrophic Disruption
D. R. Davis, C. R. Chapman, R. Greenberg, S. J. Weidenschilling 		  1075

Concordant Crater Floor Elevations on the Moon
R. A. de Hon 		  1076

The Medanitos Feldspar Cumulate Eucrite
J. S. Delaney, C. E. Nehru, M. Prinz 		  1077

The Polymict Eucrites
J. S. Delaney, M. Prinz, H. Takeda 		  1078

Indigenous Lunar Volatiles in Mare Volcanic Glasses
J. W. Delano, D. H. Lindsley 		  1079

Mare Volcanic Glasses from Apollo 17
J. W. Delano, D. H. Lindsley 		  1080

Role of Whitlockite and Apatite in Lunar Felsite
J. E. Dickinson, P. C. Hess 		  1081

Polarimetric Analysis of the Mars' Dust Storms and Clouds
A. Dollfus, S. Ebisawa 		  1082

Geochemical Constraints on the Origin of the Moon
M. J. Drake 		  1083

Meteorite from the Lunar Terrae: Preliminary Petrology of ALHA 81005,9
M. J. Drake 		  1084

Experimental Determination of the Partitioning of Gallium Between Metal and Silicate: Electron and Ion Probe Study
M. J. Drake, H. E. Newsom, S. Reed, M. C. Enright 		  1085

Breccias in the Footwall of the Sudbury Impact Structure - Terrestrial Equivalents of Lunar Breccias?
B. O. Dressler 		  1086

Rheology of Ice ih at High Pressure and Low Temperature
W. B. Durham, H. C. Heard, S. H. Kirby 		  1087

Aphrodite Terra, Venus: Characteristics of Geologic Provinces
W. J. Ehmann, J. W. Head 		  1088

A Refractory Inclusion from the Essebi (CM2) Carbonaceous Chondrite
A. El Goresy, H. Palme, H. Yabuki, K. Nagel, P. Ramdohr 		  1089

On the Production of Cosmogenic Nuclides by High-Energy Secondary Particles: Simulation Experiments with Beam Stop Neutrons
P. Englert, S. Theis, R. C. Reedy, J. R. Arnold 		  1090

Dating of Early Regolith Exposure and the Evolution of Trapped 40AR/36AR with Time
O. Eugster, J. Geiss, N. Grogler 		  1091

ALUMINUM-26 Content of ALHA 81005
J. C. Evans, J. H. Reeves 		  1092

Cosmogenic Radionuclides in the WETHERSFIELD-1982 and Tuxtuac Chondrites
J. C. Evans, J. H. Reeves 		  1093

No Unusual Compositions of the Stable Isotopes of Nitrogen, Carbon and Hydrogen in SNC Meteorites
A. E. Fallick, R. W. Hinton, D. P. Mattey, S. J. Norris, C. T. Pillinger, P. K. Swart, I. P. Wright 		  1094

Concerning the Size Distribution of Ultrafine Iron in Lunar Soil
A. E. Fallick, C. T. Pillinger, A. Stephenson, R. M. Housley 		  1095

The Geochemical Behavior of Refractory Noble Metals and Lithophile Trace Elements in Cai's
B. Fegley, A. S. Kornacki 		  1096

Chemical Probes of Saturn's Deep Atmosphere
B. Fegley, R. G. Prinn 		  1097

Circular Structure Logancha as Possible Meteorite Crater in Basalts of the Tunguska Syneclise
V. I. Feldman, L. V. Sazonova, Yu. V. Mironov, I. G. Kapustkina, B. A. Ivanov 		  1098

Experimental Impacts Into Viscous Fluids: Implications for Oscillating Peak Models of Crater Formation
J. H. Fink, R. Greeley 		  1099

CARBON-14 Ages of Antarctic Meteorites
E. L. Fireman 		  1100

Characterization of Unique Norite/gabbro Clasts in Breccia 67975
M. K. Flohr, O. B. James 		  1101

Glasses from Consortium Breccias 64435, 61015 and 67975
M. K. Flohr, O. B. James 		  1102

Lithification and Disintegration on the Surface of Venus
C. P. Florensky, A. T. Basilevsky, V. P. Kryuchkov, R. O. Kusmin, O. V. Nikolaeva, A. A. Pronin, I. M. Chernaya, Yu. S. Tyuflin, A. S. Selivanov, M. K. Naraeva, L. B. Ronca 		  1103

Redox Indicator "contrast" on the Surface of Venus
C. P. Florensky, O. V. Nikolaeva, V. P. Volkov, A. F. Kudryashova, A. A. Pronin, Yu. M. Gektin, E. A. Tchaikina, A. S. Bashkirova 		  1104

Rapid Erosion of Plastics in Near-Earth Orbit and a Means of Prevention
P. Fraundorf, D. Lindstrom, N. Pailer, P. Swan, R. Walker, E. Zinner 		  1105

Laboratory Infrared Spectroscopic Measurements of Interplanetary Dust Particles and Comparison with Astronomical Observations of Comet Dust
P. Fraundorf, R. I. Patel, S. A. Sandford, R. M. Walker 		  1106

Micro-Irghizites from a Sediment Samples from the Zhmanshin Impact Structure
K. Fredriksson, B. P. Glass 		  1107

Bushveld Igneous Complex, South Africa: Absence of Shock-Metamorphic Effects after an Extensive Search
B. M. French 		  1108

The Phase Convection in Relation to Mechanism of the Highland Lunar Rocks Formation
M. Ya. Frenkel 		  1109

Small Cones in Cydonia: Distribution and Properties Related to Background Terrain
H. Frey, A. M. Semeniuk, M. Jarosewich 		  1110

Carbon, Nitrogen and Xenon Components in the Allende Carbonaceous Chondrite
U. Frick, R. H. Becker, R. O. Pepin, D. J. Desmarais 		  1111

Possible Effects of Thermal Stress on the Lithification of Chondrite Parent Bodies
N. Fujii, Y. Hamano, M. Miyamoto 		  1112

Effects of Low Melting-Temperature Components on the Lithification of Planetesimals and Meteorites
N. Fujii, M. Miyamoto, K. Ito, Y. Kobayashi 		  1113

Anisotropic Shape of Fe-Ni Grains in Ordinary Chondrites
N. Fujii, M. Miyamoto, Y. Kobayashi, K. Ito 		  1114

Lu-Hf Systematics of the Lunar and Terrestrial Basalts
H. Fujimaki, M. Tatsumoto, D. M. Unruh 		  1115

The Chemistry of the Ordinary Chondrites
C. R. Fulton, J. M. Rhodes 		  1116

The Origin of the Ordinary Chondrites: Implications from Refractory and Siderophile Element Abundances
C. R. Fulton, J. M. Rhodes 		  1117

The Asteroid (4) Vesta: Rotational Spectral Variations, Surface Material Heterogeneity, and Implications for the Origin of the Basaltic Achondrites
M. J. Gaffey 		  1118

Explosion Craters in Ice at Large Scaled Yields
E. S. Gaffney, H. K. Brown, J. A. Cheney 		  1119

Radar Roughness at Venus Landing Sites
J. B. Garvin, J. W. Head 		  1120

Size Frequency Analysis of Fragments in Venera 13 and 14 Panoramas of Venus
J. B. Garvin, J. W. Head, A. T. Basilevsky 		  1121

Venus Global Radar Roughness: a Preliminary Analysis
J. B. Garvin, J. W. Head, S. Zisk, G. Pettengill 		  1122

Transformation of Venera 13 and 14 Panoramas Into Viking Lander Perspective
J. B. Garvin, P. Helfenstein, M. T. Zuber 		  1123

The Terrestrial Accretion of Lunar Material
D. E. Gault 		  1124

Water-Soluble Ion Behavior in Cold Desert Environments
E. K. Gibson, S. A. Hokanson, S. J. Wentworth, R. Bustin 		  1125

Sulfur in Achondritic Meteorites
E. K. Gibson, C. B. Moore 		  1126

Fault Type Predictions from Stress Distributions on Planetary Surfaces: Importance of Fault Initiation Depth
M. P. Golombek 		  1127

Origin of Triple Bands on Europa
M. Golombek, E. Bruckenthal 		  1128

Tharsis Fault Sequence as a Test of a Deformation Mechanism
M. P. Golombek, R. J. Phillips 		  1129

Spectral Reflectance of Unquenched Sulfur
J. Gradie, J. Moses 		  1130

Preliminary Investigation of Ti-Site Geometry in Lunar Volcanic and Impact Glasses by X-Ray Absorption Spectroscopy
R. B. Greegor, F. W. Lytle, R. C. Ewing, K. Keil 		  1131

Radar Signatures of Wind Streaks: Preliminary Sir-A Analysis
R. Greeley, Y. Asmerom, S. Barnett 		  1132

Venus: Preliminary Wind Tunnel Simulations of Aeolian Processes
R. Greeley, S. H. Williams, J. R. Marshall, B. R. White, J. D. Iversen, R. N. Leach, J. B. Pollack 		  1133

The Origin of Comets: Icy Residue of Planet Growth
R. Greenberg, S. J. Weidenschilling, C. R. Chapman, D. R. Davis, W. K. Hartmann 		  1134

The Impact Cratering Rate in Recent Time: a Reappraisal
R. A. F. Grieve 		  1135

Collisional Balance of the Meteoritic Complex
E. Grun, H. A. Zook, H. Fechtig 		  1136

Three Mars Years of Surface Contrast Changes Seen at the Mutch Memorial Station (viking Lander 1)
E. A. Guinness, R. E. Arvidson 		  1137

Plasma Sputtering Near Enceladus and the Source of E-Ring Particles
P. K. Haff, A. Eviatar, G. L. Siscoe 		  1138

Central Structures in Martian Impact Craters: Morphology, Morphometry and Implications for Substrate Volatile Distribution
W. S. Hale 		  1139

Elysium Region, Mars: Characterization of Tectonic Features
J. L. Hall, S. C. Solomon, J. W. Head, P. Mouginis-Mark 		  1140

On the Origin of Planetary Rings
A. W. Harris 		  1141

Organic Molecules and Carbonaceous Chondrites
H. Hartman, B. Fegley, R. G. Prinn, J. S. Lewis 		  1142

Energy Partitioning in Impacts Into Regolith-Like Powders
W. K. Hartmann 		  1143

Dirty-Ice Materials of Comets Inferred from VJHK Visual/inf Observations
W. K. Hartmann, D. P. Cruikshank 		  1144

On the Distribution of Trace Elements among Phases of Rocks from Stillwater Anorthosite An-I
L. A. Haskin, P. A. Salpas, I. S. McCallum 		  1145

Spectral Reflectance Studies of Dark-Haloed Impact Craters: Implications for the Composition and Distribution of Ancient Lunar Basalts
B. R. Hawke, J. F. Bell 		  1146

Spectral Studies of the Aristarchus Region: Implications for the Composition of the Lunar Crust
B. R. Hawke, P. G. Lucey, T. B. McCord, C. M. Pieters, J. W. Head 		  1147

Geology of Maxwell Montes, Venus
J. W. Head, D. B. Campbell, A. R. Peterfreund, S. A. Zisk 		  1148

Characterization of the Banded Terrain in Akna and Freyja Montes, Venus
J. W. Head, A. R. Peterfreund, D. B. Campbell, S. A. Zisk 		  1149

Geomorphic Structures on Europa: a New Method for the Recognition of Features Near the Limit of Resolution
P. Helfenstein 		  1150

A New Earth-Approaching Asteroid, 1982XB
E. F. Helin, A. W. Harris, J. W. Young, E. F. Tedesco, L. A. Lebofsky, D. Tholen, R. P. Binzel, N. D. Hulkower 		  1151

Archean Tectonics: Evidence from the Beartooth Mountains, Montana
D. J. Henry, J. L. Wooden, P. A. Mueller, D. W. Mogk 		  1152

On the Early Fractionation of the Lunar Crust
F. Herbert 		  1153

26AL-PRODUCTION Rates and 53MN/26AL Production Rate Ratios in Non-Antarctic Chondrites and Their Application to Bombardment Histories
U. Herpers, P. Englert 		  1154

Density Estimates of Magmas at High Pressure
P. C. Hess 		  1155

Plagioclase Suspensions and the Origin of the Mare Basalt Source Regions
P. C. Hess 		  1156

Diogenites and Related Magmas
R. H. Hewins 		  1157

Intrinsic Oxygen Fugacity Measurements for Clasts in Diogenites and Mesosiderites
R. H. Hewins, G. C. Ulmer 		  1158

Ion Microprobe Measurement of D/h Ratios in Meteorites
R. W. Hinton, J. V. P. Long, A. E. Fallick, C. T. Pillinger 		  1159

A New Upper Bound for the Radius of a Highly Conducting Lunar Core Using Inverse Theory
B. A. Hobbs, C. P. Sonett, L. L. Hood, F. Herbert 		  1160

Crystal-Liquid Experiments Relevant to Terrestrial Planetary Interiors: Controlling Volatile Activities
J. R. Holloway, S. Jakobsson 		  1161

On the Existence and Implications of Coupling Parameters in Cratering Mechanics
K. A. Holsapple 		  1162

Effect of Pressure on Infrared-Spectra of Ice VII
W. B. Holzapfel, B. Seiler, M. F. Nicol 		  1163

A Correlative Study of Orbital Electron Reflectance and Gama Ray Data with Surface Geology on the South-Central Lunar Far Side
L. L. Hood, R. P. Lin, A. E. Metzger 		  1164

A Survey of Astronomical Evidence Relating to the Possibility of an Early Solar Origin for Meteoritic Paleomagnetism
L. L. Hood, C. P. Sonett 		  1165

The Chemistry of Projectile Residue in Experimental Microcraters
F. Horz, H. Fechtig, J. Janicke, E. Schneider, H. Kuzcera 		  1166

Bunte Breccia of the Ries: Continuous Deposits of Large Impact Craters
F. Horz, R. Ostertag 		  1167

Planetary Aggregation and Nebula Tides
K. Hourigan, W. R. Ward 		  1168

Crater Ejecta Scaling Laws
K. R. Housen 		  1169

Lunar Regolith Evolution
R. M. Housley 		  1170

Parana Basin Lavas: Chemical and Petrographic Characteristics
S. S. Hughes, Y. L. Wang, R. A. Schmitt, R. V. Fodor, C. Corwin, A. Roisenberg 		  1171

Extreme MG Fractionation and Evidence of TI Isotopic Variations in Murchison Refractory Inclusions
I. D. Hutcheon, I. M. Steele, D. E. S. Wachel, J. D. MacDougall, D. Phinney 		  1172

The Origin of Magnetite in Carbonaceous Chondrites
M. Hyman, M. W. Rowe 		  1173

The Model of Cratering in Ideal-Plastic Media
B. A. Ivanov 		  1174

On the Fragment-Size Distribution of Ejecta of Impact Craters
B. A. Ivanov, A. T. Basilevsky 		  1175

Reduction of SIO2 to SI and Metallurgical Transformations in AL by Hypervelocity Impact of Al-Projectiles Into Quartz Sand
C. Jammes, D. Stoffler, A. Bischoff, W. U. Reimold, D. E. Gault 		  1176

40AR-39AR Dating of North Ray Crater Ejecta. I.
E. K. Jessberger 		  1177

Mesosiderites: (1) Reevaluation of Cooling Rates and (2) Experimental Results Bearing on the Origin of Metal
J. H. Jones 		  1178

Experimental Geochemistry in Very Reducing Systems: Extreme REE Fractionation by Immiscible Sulfide Liquids
J. H. Jones, W. V. Boynton 		  1179

Large-Scale Permafrost Melting and the Origin of Mega-Aureo on Mars
H.-P. Jons 		  1180

Permafrost-Related Types of Large-Scale Dissection, Degradation and Deformation of Martian Landscape
H.-P. Jons 		  1181

Application of Accelerator Mass Spectrometry to the Measurement of 14C in Meteorites
A. J. T. Jull, T. H. Zabel, D. J. Donahue, E. L. Fireman 		  1182

ALHA81005: a New Sample from the Lunar Highlands?
G. W. Kallemeyn 		  1183

Enceladus: an Analog of Terrestrial Plate Tectonism?
J. S. Kargel 		  1184

Interstellar Origin of Organic Matter in Meteorites
J. F. Kerridge 		  1185

Exsolution Textures in Pyroxenes from Eucrite Breccia Vetluga
N. R. Khisina, L. V. Petushkova, A. Ya. Skripnik 		  1186

Thermal History of 15555 Basalt Based on Pyroxene Exsolution
N. R. Khisina, L. V. Petushkova, L. A. Taylor, M. A. Carpenter 		  1187

Spectral Reflectance Measurements and Surface Characteristics of Meteoritic Condensates from Solar Furnace Experiments
T. V. V. King, M. J. Gaffey, E. A. King 		  1188

Thermal Evolution of a Differentiated Ganymede and Implications for Surface Features
R. L. Kirk, D. J. Stevenson 		  1189

26AL Measurements in Individual Lunar Grains
J. Klein, R. Middleton, G. M. Raisbeck, F. Yiou, Y. Langevin 		  1190

The Congo Craton: an Old Impact Structure?
G. G. Kochemasov 		  1191

Near-Surface Contact Formation of the Lunar High-Ti Basalt Magma: is There a Resembling Process on the Earth?
G. G. Kochemasov 		  1192

Determination of Fluorine in Tektites and Impaktites
C. Koeberl, W. Kiesl, F. Kluger, H. H. Weinke 		  1193

Zhamanshinites and Aoelloul-Glass Main Element Analyses and Correlations
C. Koeberl 		  1194

Lithium in Tektites and Impactites
C. Koeberl, R. Berner 		  1195

Comparative Fourier Grain Shape Analysis of Meteoritic Breccias and Lunar Soils
K. Kordesh 		  1196

A New Classification and Database for Stratospheric Dust Particles
K. M. Kordesh, I. D. R. MacKinnon, D. S. McKay 		  1197

Geochemical, Mineralogical, and Textural Relationships among Allende Refractory Inclusions and Olivine Chondrules
A. S. Kornacki 		  1198

On the Origin of Spinel-Rich Inclusions
A. S. Kornacki, R. E. Cohen 		  1199

The Nature of Coarse-Grained Cai's
A. S. Kornacki, R. E. Cohen 		  1200

Geochemical Study of Individual 1-2 MM Particles from Apollo 16 Soil 65502
R. L. Korotev 		  1201

Geochemical Study of Individual 1-2 MM Particles from Apollo 16 Soil 67712
R. L. Korotev 		  1202

Carbon Dioxide Loss in Experimentally Shocked Calcite and Limestone
R. K. Kotra, T. H. See, E. K. Gibson, F. Horz, M. J. Cintala, R. S. Schmidt 		  1203

Formation of IAB and Iicd Iron Meteorites and the Origin of Their Silicate Inclusions
A. Kracher 		  1204

Notes on the Evolution of the Iiiab/pallasite Parent Body
A. Kracher 		  1205

Dusty Olivines in the Vigarano (CV3) Chondrite: Evidence for an Ubiquitous Reduction Process
A. Kracher, E. R. D. Scott, K. Keil 		  1206

Mapping of Permafrost Indications on Martian Surface: Latitudinal Zonality
R. O. Kuzmin, N. N. Bobina, G. A. Burba, V. P. Shashkina 		  1207

Murchison: Contradictions and Clues
P. Lambert 		  1208

Shocked Micas
P. Lambert 		  1209

Shock Experiments in Shocked Rocks from Lake Mistastin
P. Lambert, R. A. F. Grieve 		  1210

Bounds on the Homogeneous Accretion of the Earth
M. A. Lange, T. J. Ahrens 		  1211

Shock-Induced CO2-PRODUCTION from Carbonates and a PROTO-CO2-ATMOSPHERE on the Earth
M. A. Lange, T. J. Ahrens 		  1212

The New European Project for the Exploration of Asteroids: Agora
Y. Langevin 		  1213

Gas-Dust Fractionation and the Origin of Chondritic Meteorites
J. W. Larimer, H. A. Bartholomay 		  1214

Chemistry of the Apollo 11 Highland Component
J. C. Laul, J. J. Papike, S. B. Simon, C. K. Shearer 		  1215

On Origin of Neon-A
A. K. Lavrukhina, R. I. Kuznetsova 		  1216

Mineralogical and Spectral Reflectance Characteristics of the Carlton Rhyolite, Oklahoma: Implications for the Martian Surface
C. A. Lawson, R. V. Morris 		  1217

Stagnant Ice in the Martian North Polar Ice CAP
J. H. J. Leach 		  1218

The Rapid Ablation Zone -- a Distinctive Terrain Unit in the Martian North Polar Ice CAP
J. H. J. Leach 		  1219

The Rare Gas Isotopic Composition in Martian Atmosphere: Additional Data Analysis
L. K. Levsky 		  1220

Search for Isotopic Anomalies Correlated with CCF Xenon I. Barium
R. S. Lewis, E. Anders, T. Shimamura, G. W. Lugmair 		  1221

Isotopically Anomalous Carbon in the Murchison Meteorite and its Association with Noble Gas Components
R. S. Lewis, E. Anders, P. K. Swart, M. M. Grady, C. T. Pillinger 		  1222

Geochemical Studies of Apollo 16 Dimict Breccias
M. M. Lindstrom, P. A. Salpas 		  1223

Geochemical Studies of North Ray Crater Breccias
M. M. Lindstrom, P. A. Salpas 		  1224

High-K Komatiite Dikes from the Beartooth Mts.
J. Longhi, J. L. Wooden 		  1225

Ice-Lubricated Flow in Martian Fretted Channels, and Implications for Outflow Channel Processes
B. K. Lucchitta 		  1226

146SM was Alive and Kicking in Allende; Isotopic Abundance Patterns in Allende Residues. II. Nd, SM and SR
G. W. Lugmair, T. Shimamura, R. S. Lewis, E. Anders 		  1227

Electron Microscopy of Carbonaceous Matter in Acid Residues from the Orgueil (C1) and Cold Bokkeveld (C2) Meteorites
G. R. Lumpkin 		  1228

Microstructural Variations in Allende Carbonaceous Matter
G. R. Lumpkin 		  1229

Are Orgueil Carbonates Contemporary with Parent Body Formation?
J. D. MacDougall, G. W. Lugmair, J. F. Kerridge 		  1230

Reverse Zoning in Melilite and Crystallization Sequences in Allende Type B Ca-Al Inclusions
G. J. MacPherson, J. M. Paque, E. Stolper, L. Grossman 		  1231

Information of Astrophysical Interest in the Isotopes of Solar Wind Implanted Noble Gases
O. K. Manuel, G. Hwaung 		  1232

Vaporization of Lunar Highland Rocks: Experimental Investigation
O. M. Markova, O. I. Yakovlev, G. A. Semenov, A. N. Belov 		  1233

Recoils: New Opportunities to Study and Date Early Solar System Processes
K. Marti 		  1234

Vertical Chemical Differentiation of Massive Impactites, Forming Thick Sheets in Terrestrial Impact Craters
V. L. Masaitis, A. N. Danilin 		  1235

- and Volcanism Based on Latest Pioneer Venus and Venera Data
H. Masursky 		  1236

Destruction of Rocks by Low Velocity Impact
T. Matsui, T. Waza 		  1237

Identification of Tectonic Trends in the Polar Regions of the Inner Planets: Preliminary Results for the Moon and Mars
T. A. Maxwell 		  1238

Oxygen Isotopic Composition of ALHA 81005
T. K. Mayeda, R. N. Clayton 		  1239

Formation of Mg-Rich Pristine Rocks by Crustal Metasomatism
I. S. McCallum 		  1240

Cosmic Dust Collection and Analysis Using the Capture Cell Technique on Space Shuttle Flight STS-3/OSS-1
J. A. M. McDonnell, W. C. Carey, D. G. Dixon 		  1241

Spectral Reflectance of Near-Earth Asteroids: Implications for Composition, Origin and Evolution
L. A. McFadden, M. J. Gaffey, T. B. McCord 		  1242

The Production Curve for Agglutinates in Lunar Soils
D. S. McKay, A. Basu 		  1243

A Petrographic Survey of Regolith Breccias from the Apollo 15 and 16 Collection
D. S. McKay, S. J. Wentworth 		  1244

White Portions of Apollo 16 Dimict Breccias are Polymict
J. P. McKinley, G. J. Taylor, K. Keil 		  1245

Chondrules in Enstatite Chondrites - Nature and Source of Enstatite
S. G. McKinley, E. R. D. Scott, K. Keil 		  1246

Origin of the E Ring: Condensation of Impact VAPOR...OR Boiling of Impact Melt?
W. B. McKinnon 		  1247

Geochemistry of Archean Sedimentary Rocks and the Nature of the Archean Crust
S. M. McLennan, S. R. Taylor 		  1248

Measures of Chondrite Equilibration
H. Y. McSween, R. E. Grimm 		  1249

Petrography of wa, a Well-Known CAI from the Allende Meteorite
G. P. Meeker, J. T. Armstrong, G. J. Wasserburg 		  1250

A Detailed Spectral Study of Agenor Linea, Europa
T. A. Meier 		  1251

Possible Fossil Craters on Europa
T. A. Meier 		  1252

Impact Ejection, Spallation and the Origin of Certain Meteorites
H. J. Melosh 		  1253

On the Contribution of Primary Gcr-Particles to the Production of Cosmogenic Nuclides in Meteorites
R. Michel, R. Stuck 		  1254

Comparative Formation Processes with Structural and Compositional Orderings of Terrestrial and Extraterrestrial Plagioclases
Y. Miura 		  1255

Thermal Evolution of a Howardite Parent Body: Models to Produce Molten Surface-Layer
M. Miyamoto 		  1256

Mass Spectra, Shape Distributions and 'vfr' Measurements of Antarctic Meteorites
M. Miyamoto, N. Fujii, K. Ito, Y. Kobayashi 		  1257

Silicon Isotopes in Components of the Allende Meteorite
C. Molini-Velsko, T. K. Mayeda, R. N. Clayton 		  1258

The Plains and Lineaments of Dione
J. M. Moore 		  1259

Elemental Composition of Sulfide Particles from an Ultramafic Xenolith and the Siderophile Element Content of the Upper Mantle
J. W. Morgan, P. A. Baedecker 		  1260

Hot SPOT Heat Loss and Tectonic Style on Venus and in the Earth's Archean
P. Morgan 		  1261

Hot SPOT Heat Loss, Thermal Isostasy and Gravity on Venus
P. Morgan, R. J. Phillips 		  1262

Deformation of Olivine in the Antarctic Ureilites, Allan Hills 77257 and 78262
H. Mori, H. Takeda 		  1263

Earth's Gravitational Drop Motions
N.-A. Morner 		  1264

Geophysical Changes at the Paleozoic/mesozoic Boundary
N.-A. Morner 		  1265

Optical Spectra and Band Assignments for the Hematite (ALPHA-FE2O3)-CORUNDUM (ALPHA-AL2O3) Series
R. V. Morris, H. V. Lauer 		  1266

Spectral Evidence and Implications for the Occurrence of Aluminous Iron Oxides on Mars
R. V. Morris, H. V. Lauer, J. L. Gooding, W. W. Mendell 		  1267

Some Evidence Concerning the Source Material of Large Glass Objects from the Moon
R. V. Morris, T. H. See, F. Horz 		  1268

Radar Characteristics of Thermally-Anomalous Impact Craters on Mars
P. J. Mouginis-Mark, P. R. Christensen, S. H. Zisk 		  1269

Ejecta Areas of Impact Craters on the Martian Ridged Plains
P. J. Mouginis-Mark, E. A. Cloutis 		  1270

Packing Effect of Fluffy Cometary Particles
T. Mukai, H. Fechtig 		  1271

Partitioning of Potassium and Uranium Between Fe-Fes and Silicate Liquids
M. T. Murrell, W. R. Heuser, D. S. Burnett 		  1272

Diffusion Cofficient of O in Melilite: Implication to the Thermal History of Allende CAI
H. Nagasawa 		  1273

Paleomagnetic Re-Examination of the Allende Carbonaceous Chondrite
T. Nagata, M. Funaki 		  1274

Applicability of La-Ce Systematics to Planetary Samples: Preliminary Results and Evaluation
N. Nakamura, M. Tatsumoto, K. R. Ludwig 		  1275

Ancient Solar Flare Neon and Solar Cosmic Ray Proton Fluxes from Gas-Rich Meteorites
C. M. Nautiyal, M. N. Rao, T. R. Venkatesan 		  1276

Iridium Abundances in the Precambrian-Cambrian Boundary Deposits and Sedimentary Rocks of Russian Platform
M. A. Nazarov, L. D. Barsukova, G. M. Kolesov, A. S. Alekseev 		  1277

The Tunguska Event: Mineralogical and Geochemical Data
M. A. Nazarov, M. I. Korina, G. M. Kolesov, N. Vasil'ev, E. Kolesnikov 		  1278

YAMATO-7308, an Important Howardite
C. E. Nehru, J. S. Delaney, M. Prinz, M. Weisberg, H. Takeda 		  1279

Brachina: a New Type of Meteorite, not a Chassignite
C. E. Nehru, M. Prinz, J. S. Delaney, G. Dreibus, H. Palme, H. Wanke 		  1280

Spectral Evidence for Magnetospheric Interactions with the Surfaces of the Icy Galilean Satellites
M. L. Nelson, T. B. McCord, R. N. Clark, T. V. Johnson, D. Matson 		  1281

The Depletion of Molybdenum in the Earth, Moon, and in the Eucrite Parent Body
H. E. Newsom, H. Palme 		  1282

36CL Depth Profile in Apollo 15 Drill Core
K. Nishiizumi, J. R. Arnold, D. Elmore, X. Z. Ma, H. E. Gove, I. Brissaud 		  1283

Measurements of 26AL in Apollo 15 Drill Core Using Accelerator Mass Spectrometry
K. Nishiizumi, J. R. Arnold, J. Klein, R. Middleton 		  1284

Change of Elemental Composition of the Iron Meteorite by Artificial Ablation Process
K. Nogami 		  1285

Moore County Meteorite: Petrology and Thermal History
G. L. Nord 		  1286

Is Carbon in the Ancient Solar Wind Isotopically Light?
S. J. Norris, P. K. Swart, I. P. Wright, C. T. Pillinger 		  1287

Half-Life of 26AL
T. L. Norris, A. J. Gancarz, D. J. Rokop, K. W. Thomas 		  1288

Nucleation Theory is not Applicable to the Condensation of Refractory Grains in the Primitive Solar Nebula
J. Nuth, B. Donn 		  1289

Thermal Metamorphosis of SI2O3 (circumstellar Dust Analog)
J. Nuth, B. Donn 		  1290

The Oblique Impact Hypothesis and Relative Probabilities of Lunar and Martian Meteorites
L. E. Nyquist 		  1291

Formation of a Lunar Granite 4.1 AE ago
L. Nyquist, C.-Y. Shih, B. Bansal, H. Wiesmann, J. Wooden 		  1292

Constraints on the Impact-On Origin of SNC Meteorites
J. D. O'Keefe, T. J. Ahrens 		  1293

Element Correlations among North American Tektites
T. C. O'Reilly, L. A. Haskin, E. A. King 		  1294

Chemical Composition for the Minerals from the Norin-Shibir Meteorite - an Anomalous Octahedrite with Silicate Inclusion
Eu. G. Osadchii, N. I. Zaslavskaya, G. V. Baryshnikova 		  1295

Petrographic, Geochemical and Structural Studies on Impact Breccia Dikes of the Rochechouart Impact Structure, SW Fran
W. Oskierski, L. Bischoff 		  1296

Noble Gases in the Brachina and Chassigny Meteorites
U. Ott, F. Begemann, H. P. Lohr 		  1297

Composition Dependence of the BERYLLIUM-10 Production Rate in Stony Meteorites
D. K. Pal, C. Tuniz, R. K. Monoit, W. Savin, T. H. Kruse, G. F. Herzog 		  1298

Elephant Moraine Polymict Eucrites: a Eucrite-Howardite Compositional Link
H. Palme, B. Spettel, A. Burghele, G. Weckwerth, H. Wanke, J. S. Delany, M. Prinz 		  1299

Saturn's E-Ring and Satellite Enceladus
K. D. Pang, C. C. Voge, J. W. Rhoads, J. M. Ajello 		  1300

Apollo 11 Regolith Breccias: the Highland Component
J. J. Papike, S. B. Simon, C. K. Shearer 		  1301

Experimental Evidence for Slow Cooling of Type B Cais from a Partially Molten State
J. M. Paque, E. Stolper 		  1302

An SEM Petrographic Study of C3(V) Meteorite Matrix
J. A. Peck 		  1303

Thermodynamic Properties and Origin of Meteoritic Minerals. III. Heideite, FETI2S4
M. I. Petaev, K. S. Gavrichev, V. M. Gurevich, E. Osadchy, T. A. Stolyarova, V. E. Gorbunov, I. L. Khodakovsky 		  1304

Venus: Evidence for High Dielectric Constants in Elevated Regions
G. H. Pettengill, P. G. Ford, S. D. Nozette 		  1305

Deformation Sequence of Tharsis as a Guide to Thermal Evolution
R. J. Phillips, M. P. Golombek 		  1306

Evidence for Early Formation of Anorthosite in the Evolution of Archaen Greenstones at Pipestone Lake, Manitoba
W. C. Phinney, D. A. Morrison, D. E. MacZuga, L. D. Ashwal 		  1307

Composition of the Upper Lunar Crust: Preliminary Results from Near Infrared Reflectance Data
C. M. Pieters 		  1308

Large Craters or Small Basins on the Moon
R. J. Pike 		  1309

Impact Distribution of Early Geocentric Moonlets on the Moon
P. Pinet, A. Cazenave 		  1310

On the Isotopic Composition of Meteoritic Ruthenium
H. Poths, S. Schmitt-Strecker, F. Begemann 		  1311

Silicates in IAB and IIICD Irons, Winonaites, Lodranites an Brachina: a Primitive and Modified-Primitive Group
M. Prinz, C. E. Nehru, J. S. Delaney, M. Weisberg 		  1312

Globular Silicate Inclusions in IIE Irons and Sombrerete: Highly Fractionated Minimum Melts
M. Prinz, C. E. Nehru, J. S. Delaney, M. Weisberg, E. Olsen 		  1313

Nitrogen Isotopes in Iron Meteorites
C. A. Prombo, R. N. Clayton 		  1314

26AL and 10BE in Deep Sea Stony Spherules; Evidence for Small Parent Bodies
G. M. Raisbeck, F. Yiou, J. Klein, R. Middleton, Y. Yamakoshi, D. E. Brownlee 		  1315

A New Method to Determine the Isotopic Composition of Oxygen on a Microscale
R. S. Rajan, C. L. Melcher, S. Faragalla, M. Mendenhall, T. A. Tombrello, A. P. Sloan, L. Brown 		  1316

Chemical and Textural Study of Qingzhen, a Highly Unequilibrated Enstatite Chondrite
E. R. Rambaldi, R. S. Rajan, D. Wang 		  1317

Experimental Investigation of Metal-Silicate Partitioning of Some Lithophile Elements (ta, mn, v, Cr)
W. Rammensee, H. Palme, H. Wanke 		  1318

Planetary Tectonics: an Integrated View
A. S. P. Rao 		  1319

Confirmation of Solar Flare Neon Composition Using Lunar Pyroxenes and SCR Proton Fluxes in Last Million Years
M. N. Rao, C. M. Nautiyal, J. T. Padia, T. R. Venkatesan 		  1320

Sulphur Isotopes in Lunar Soils - Surface VS. Bulk Properties
C. E. Rees, H. G. Thode 		  1321

Petrographic and Geochemical Studies on the Basement Rocks of the Rochechouart Meteorite Crater, France, and Pseudotachylite Therein
W. U. Reimold, L. Bischoff, J. Nieber-Reimold, W. Oskierski, A. Rehfeldt 		  1322

A Study on Subophitic and Unique Strangers in Kreep-Rich Poikilitic Apollo 16 Impact Melt Rocks
W. U. Reimold, R. Borchardt, F. Mollers 		  1323

New Analyses of Mare Basalts
J. M. Rhodes, D. P. Blanchard 		  1324

- and Microsegregation in a Solidifying Lunar Magma Ocean
A. Rice 		  1325

Scanning Electron Microscopy of Condensation Related Minerals: the Bjurbole Meteorite
F. J. Rietmeijer, I. D. R. MacKinnon 		  1326

Geochemical Relationships Between the Earth's Core and Mantle
A. E. Ringwood 		  1327

Grain Size of Luna 24 Core Samples: New Data
O. D. Rode, A. V. Ivanov 		  1328

The Temperature and Pressure Effects on Silicon Diffusion in a Simple Silicate Melt
A. Ross 		  1329

Rheology of the Arsia Mons Lava Flows
L. E. Roth, R. S. Saunders 		  1330

The Effect of Thermal Variations on Reflectance Spectra of Mafic Minerals
T. L. Roush, R. B. Singer 		  1331

The Adhi-Kot Enstatite Chondrite Breccia and Implications for the Origin of Silica-Rich Clasts and Chondrules
A. E. Rubin 		  1332

Lunar Paleomagnetism, Polar Displacement and Primeval Lunar Satellites
S. K. Runcorn 		  1333

Martian Grabens and Permafrost Thickness on Mars
C. J. Runyon, M. P. Golombek 		  1334

Phosphorus Partitioning Between Silicate-Fe Metal and Sulfide Melts: Implications for Sulfide or Metal Fractionation on the Moon
M. J. Rutherford 		  1335

Compositions of Samples from Traverses of Stillwater Anorthosites An-I and An-Ii
P. A. Salpas, L. A. Haskin, I. S. McCallum 		  1336

Strength-Gravity Transition for Impact Craters in Wet Sand
R. M. Schmidt 		  1337

Development of the Quarter-Space Technique for Cratering Experiments on a Centrifuge
R. M. Schmidt, A. J. Piekutowski 		  1338

Linear and Curvilinear Feature Detectors for Remote Sensing Images
E. Schonfeld 		  1339

High Spatial Resolution Mg/al Maps of Large Areas of the Moon
E. Schonfeld, E. A. Bruckenthal 		  1340

High-Velocity Clustered Impacts: Experimental Results
P. H. Schultz, D. E. Gault 		  1341

The Beginning and End of Mare Volcanism on the Moon
P. H. Schultz, P. D. Spudis 		  1342

An Inventory of Some Unusual Geologic Features
D. H. Scott 		  1343

Petrologic Similarities among Chondrules in h, ll, co, CM and E Chondrites
E. R. D. Scott, G. J. Taylor 		  1344

Thermoluminescence Sensitivity of 16 Type 3 Ordinary Chondrites
D. W. G. Sears, K. S. Weeks 		  1345

Large Glassy Objects from Apollo 16
T. H. See, F. Horz, R. V. Morris, D. Blanchard, R. S. Seymour 		  1346

Experimental Study of Segregation in Plane Front Solidification and its Relevance to Iron Meteorite Solidification
R. Sellamuthu, J. I. Goldstein 		  1347

Impact-Generated Plume Traces on Mars
C. K. Seyfert 		  1348

Tectonic Origin of Mare Ridges: Evidence from Basalt Stratigraphy in Mare Imbrium
V. L. Sharpton, J. W. Head 		  1349

The Effect of Local Magnetic Interactions on the Crystal Field Spectra of FE3+ in Minerals
D. M. Sherman 		  1350

57FE Mossbauer Study of - Implications the FE3+ Mineralogy of Mars
D. M. Sherman, R. B. Singer 		  1351

Micrographic Granite: More from Apollo 14
J. W. Shervais, L. A. Taylor 		  1352

Texturally-Pristine Clasts from Apollo 14: Implications for Igneous Processes
J. W. Shervais, L. A. Taylor 		  1353

Sccrv Revisited -- Possible Evidence for a Partially Molten Magma Ocean
D. N. Shirley 		  1354

Petrology of the Apollo 11 Highland Component
S. B. Simon, J. J. Papike, C. K. Shearer, J. C. Laul 		  1355

The Effect of an Impact-Generated Gas Cloud on the Acceleration of Solid Ejecta
A. V. Singer 		  1356

Effects of Mineral Grain Size and Physical Particle Size on Spectral Reflectance of Basalts
R. B. Singer, P. L. Blake 		  1357

Spectral Reflectance Properties of Particulate Weathered Coatings on Rocks: Laboratory Modeling and Applicability to Mars
R. B. Singer, T. L. Roush 		  1358

Diverse Textures and Pyroxene Chemistry in Enstatite Chondrites: Mechanical Accretion of Porphyritic Chondrules
J. V. Smith 		  1359

Pre-Terrestrial Alteration of Achondrite 77005: Effect of Martian Volatiles?
J. V. Smith, I. M. Steele 		  1360

Chemical Composition of 24 Chondrules in Indarch e4 Chondrite
J. V. Smith, M. R. Smith, R. A. Schmitt 		  1361

Far-Eastern Nonmare Samples: New Data from Luna 20 and 16
M. R. Smith, R. A. Schmitt, P. H. Warren, G. J. Taylor, K. Keil 		  1362

Petrogenesis of Shergottites
M. R. Smith, R. A. Schmitt 		  1363

Mobility of Pores in Ices in the Solar System
R. Smoluchowski, M. A. Marie 		  1364

Investigation of Radiation Centers in Quartz of Rocks from Meteorite Crater
P. L. Smolyansky, A. I. Raikhlin 		  1365

Venus Banded Terrain: Evaluation of Tectonic Models for the Origin of Banding
S. C. Solomon, J. W. Head 		  1366

The Structure of the Isidis Basin, Mars, from Gravity Anomalies
S. C. Solomon, W. L. Sjogren, S. R. Bratt 		  1367

Argon Age of Apollo 15 Yellow Impact Glass
R. R. Spangler 		  1368

39AR-40AR Ages for the Apollo 15 Green and Yellow Glasses
R. R. Spangler 		  1369

Ganymede in the Thermal Infrared: Preliminary Analysis of Voyager IRIS Data
J. R. Spencer 		  1370

Rock Property Measurements Appropriate to Planetary Crusts
H. Spetzler 		  1371

The Excavation of Lunar Multi-Ring Basins: Additional Results for Four Nearside Basins
P. D. Spudis 		  1372

Some Geochemical and Geophysical Implications of Very Old and Very Young Lunar Mare Volcanism
P. D. Spudis, P. H. Schultz 		  1373

Ballistic Diffusion on Planetary Satellites
S. W. Squyres, C. Sagan 		  1374

Search for Extinct Actinides in Meteorites Through Studies of Noble Gases in Mineral Separates from Allende
B. Srinivasan, G. R. Lumpkin, F. di Brozolo, R. S. Lewis 		  1375

Visualization of the Pioneer-Venus Radar Data for Ishtar Terra and Beta Regio
D. G. Stankevich, Yu. V. Kornienko, Yu. G. Shkuratov, A. T. Basilevsky 		  1376

The Mars Geoscience Climatology Orbiter
D. A. Steffy 		  1377

On the Age of Venus Highland Topography: Constraints from the Viscous Relaxation of Relief
S. K. Stephens, S. C. Solomon, J. W. Head 		  1378

The Color of Meteoritic Hibonite: an Indicator of Oxygen Fugacity
E. Stolper, P. Ihinger 		  1379

The Relationship of Rilles and High Magnesium Material in the Cauchy Region of the Moon
P. L. Strain, C. G. Andre 		  1380

Chemical Variations in the Bishopville Enststite Achondrite
M. M. Strait, C. B. Moore, D. P. Blanchard 		  1381

The Cratering Record of Galileo Regio, Ganymede
R. G. Strom, R. Casacchia 		  1382

Gas Permeability of Three Chondrites
N. Sugiura, N. S. Brar, D. W. Strangway, T. Matsui 		  1383

Magnetic Properties of Lunar Samples 60315 and 60018: Strongly Magnetic Breccias
N. Sugiura, D. W. Strangway 		  1384

New Data on the Composition, Structure and Properties of Venus Rocks Obtained by VENERA-13 and VENERA-14
Yu. A. Surkov, L. P. Moskalyeva, O. P. Scheglov, V. V. Gromov 		  1385

Carbon and Nitrogen Studies of Carbonaceous and Unequilibrated Ordinary Chondrites
P. K. Swart, M. M. Grady, S. J. Norris, I. P. Wright, C. T. Pillinger 		  1386

Mechanism for Crater Debris Escape from Planetary-Sized Bodies
H. F. Swift, B. C. Clark 		  1387

Xenon in Irradiated Chondrules
T. D. Swindle, M. W. Caffee, C. M. Hohenberg 		  1388

Chondrite - Achondrite Transition: Mineralogic and Chemical Characteristics of an LL7 Chondrite
H. Takeda, T. J. Huston, M. E. Lipschutz 		  1389

Mineralogical Comparison of Lunar and Chondritic Vesicular Melt Breccias
H. Takeda, M. Miyamoto, T. Ishii 		  1390

Comparison of Yamato and Victoria Land Polymict Eucrites: View from Mineralogy and Isotopic Study
H. Takeda, H. Mori, J. L. Wooden, L. E. Nyquist, J. S. Delaney, M. Prinz 		  1391

Flood-Lava Model for the Olympus Mons Aureole Deposits
K. L. Tanaka 		  1392

Ancient (approximately 4.2 Ae) Highlands Volcanism: the Gabbronorite Connection?
L. A. Taylor, J. W. Shervais, R. H. Hunter, J. C. Laul 		  1393

Elemental Fractionation in the Solar Nebula and Planetary Compositions: a "predestination" Scenario
S. R. Taylor 		  1394

Residual Lower Continental Crustal Compositions
S. R. Taylor, S. M. McLennan, R. J. Arculus, M. T. McCulloch 		  1395

Geochemistry of Loess and Continental Crustal Composition
S. R. Taylor, S. M. McLennan, M. T. McCulloch 		  1396

Photochemical Production of Isotopic Anomalies in the Early Solar System
M. H. Thiemens, J. E. Heidenreich, L. Lundberg 		  1397

Two-Phase Gravitational Instabilities in Thin Disks with Application to the Origin of the Moon
A. C. Thompson, D. J. Stevenson 		  1398

An Exotic Fe-Ni Layered Material: an Improved Characterization of the "poorly Characterized Phase" in C2M Carbonaceous Chondrites
K. Tomeoka, P. R. Buseck 		  1399

Continuing Investigations of Sweeping Jovian Resonances: the 7:3 and 3:2 Resonances
M. Torbett, R. Smoluchowski 		  1400

Mass Loss from Proto-Sun Formation and Evolution of the Solar Nebula
B. M. P. Trivedi 		  1401

Sample Collection on Comet Flybys
P. Tsou, D. Brownlee, A. Albee 		  1402

The Geology of the Thaumasia Northeast Quadrangle of Mars
M. F. Tuesink 		  1403

Mechanisms of Early Planetary Differentiation
D. L. Turcotte, S. H. Emerman 		  1404

Magnesian Noritic and Basaltic Clasts in the Garland and Peckelsheim Diogenites
C. Varteresian, R. H. Hewins 		  1405

Complex Graphite, Sulfide, Arsenide, Palladium and Platinum Mineralization in a Pegmatoid Pyroxenite of the Stillwater Complex, Montana
A. Volborth, R. M. Housley 		  1406

Xe Isotopic Composition in Different Fractions of the Kainsaz Chondrite
D. Vu Minh, A. V. Fisenko, L. F. Semjonova, A. K. Lavrukhina, Ju. A. Shukolyukov 		  1407

40AR-39AR Age of the Vetluga Meteorite
D. Vu Minh, M. M. Fugzan, G. M. Kolesov, A. Ya. Skripnik, Yu. A. Shukolyukov 		  1408

Isotopic Composition of xe and KR in - and Micro-Inclusions of Iron Meteorites
D. Vu Minh, P. S. Goel, N. I. Zaslavskaya, Yu. A. Shukolyukov 		  1409

A Search for xe Isotope Anomalies Produced by Neutron Irradiation in Space
D. Vu Minh, Yu. A. Shukolyukov, A. Ia. Scripnic 		  1410

A Comparison of Lunar and Terrestrial Early Crust Formation
D. Walker 		  1411

Filamentous Microfossils from the 3.1-3.5 Billion-Year Swaziland Supergroup, Barberton Mountain Land, South Africa
M. M. Walsh, D. R. Lowe 		  1412

Mobile Trace Elements in Shocked Chondrites: Variations with Petrology and 40AR/39AR Ages
T. M. Walsh, T. J. Huston, M. E. Lipschutz 		  1413

Geochemical Evidence for the Formation of the Moon from Material of the Earth's Mantle
H. Wanke, G. Dreibus, H. Palme, W. Rammensee, G. Weckwerth 		  1414

A Relationship Between Carbonaceous (cv) and Enstatite Chondrites
D. A. Wark 		  1415

Crystal Chemical Effects on the Bulk Compositions of Allende Group i Ca-Al Inclusions
D. A. Wark 		  1416

Evidence for Fe-Ni Dust Fractionation in the Protosolar Nebula
D. A. Wark 		  1417

The Scorpion, a Novel Spinel-Hibonite Inclusion in the Allende Meteorite
D. A. Wark, W. V. Boynton 		  1418

Regolith Breccia ALHA 81005: Evidence of Lunar Origin, and Nature of Pristine and Nonpristine Clasts
P. H. Warren, G. J. Taylor, K. Keil 		  1419

Seventh Foray: Whitlockite-Rich Lithologies, a Diopside-Bearing Troctolitic Anorthosite, Ferroan Anorthosites, and KREEP
P. H. Warren, G. J. Taylor, K. Keil, G. W. Kallemeyn, J. T. Wasson 		  1420

Magnetic Properties of Manmade fe and Feni Alloys and the Feni Phases in Meteorites: a Review
P. Wasilewski 		  1421

O-Isotope Anomalies: Interpretation in Terms of Presolar Solid and Gas Components and Nebula Fractionation Processes
J. T. Wasson, D. N. Shirley 		  1422

Lithospheric Thickness Based on Volcano Spacing in the Tharsis Region of Mars
T. R. Watters, T. A. Maxwell 		  1423

Size Distribution of Fine Fragments Produced from Destruction of Rocks by Low Velocity Impact
T. Waza, T. Matsui 		  1424

Kinks, Clumps, and Accretion in Saturn's F-Ring
S. J. Weidenschilling, D. R. Davis 		  1425

An Improved Thermal Model for Cometary Nuclei
P. R. Weissman, H. H. Kieffer 		  1426

Frigoris Revisited
J. L. Whitford-Stark 		  1427

Effects of the Procellarum Basin on Lunar Geology, Petrology, and Tectonism
D. E. Wilhelms 		  1428

Chondrule Compositions and the Accretion of Chondrites
L. L. Wilkening 		  1429

Theoretical Aspects of Photoclinometric Terrain Profiling on the Galilean Satellites
L. Wilson, M. A. Brown, E. M. Parmentier, J. W. Head 		  1430

Evidence of Ancient Fluvial Activity Along the Plateau-Plains Boundary in NW Mare Acidalium Quadrangle (MC-4), Mars
N. E. Witbeck, J. R. Underwood 		  1431

Searching for Comet Cores among Apollo/amor Asteroids
C. A. Wood 		  1432

L Chondrites: a Photogeologist's Search for Physical Processes
C. A. Wood, A. Silliman 		  1433

Formation of Cai's and Chondrules in the Nebular Shock Front
J. A. Wood 		  1434

REE Fractionation in ST. Severin Phosphates: Implications for Pu-Ree Coherence
D. S. Woolum, D. S. Burnett, C. J. Maggiore, T. M. Benjamin 		  1435

Light Nitrogen, its Composition, Association and Location in the Allende and Murchison Meteorites
I. P. Wright, S. J. Norris, C. T. Pillinger, R. S. Lewis, E. Anders 		  1436

Structural Fabric Elements Observed in Leoville (CV3)
J. Wright-Clark, G. G. Goles 		  1437

Model for Calculating Viscosities in the NA2O-FEO-FE2O3-SIO System
J. M. Wu, L. C. Klein 		  1438

Lunar and Planetary Topographic Mapping
S. S. C. Wu 		  1439

Mass-Spectrometric Investigation of the Chondrite at the High Temperature
O. I. Yakovlev, O. M. Markova, G. A. Semenov, A. N. Belov 		  1440

Chemical Compositions of "chondrite Spherules" from Deep Sea Sediments Using Instrumental Neutron Activation
K. Yamakoshi 		  1441

The Relevance of Hydrogen on the Origin of Meteorites
J. Yang, S. Epstein 		  1442

Carbon Isotopic Composition of Individual, Low Molecular Weight Hydrocarbons and Monocarboxylic Acids from Murchison Meteorite
G. Yuen, N. Blair, D. Des Marais, S. Chang 		  1443

Morphology of the Outer Shells of the Tunguska Spherules
M. Zbik, Z. I. Wigury 		  1444

Elevation-Dependent Corrections for Thermal Inertias on Mars
J. R. Zimbelman, R. Greeley 		  1445

Surface Properties of Ascraeus Mons Obtained from IRTM Data
J. R. Zimbelman, R. Greeley 		  1446

Mineral Composition of Martian Regolith: Thermodynamic Assessment
M. Yu. Zolotov, Yu. I. Sidorov, V. P. Volkov, M. V. Borisov, I. L. Khodakovsky 		  1447

Variation of Stress with Depth in Ganymede's Lithosphere: Implications for Tectonic Evolution
M. T. Zuber, E. M. Parmentier 		  1448