Fifteenth Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

Electrostatic Separation and Sizing of Ilmenite in Lunar Soil Simulants and Samples
W. N. Agosto 		  1001

Shock Vaporization and the Accretion of the Icy Satellites of Jupiter and Saturn
T. J. Ahrens, J. D. O'Keefe 		  1002

Ice-Covered Volcanic Water Flows on Ganymede
M. L. Allison, S. M. Clifford 		  1003

Application of a Two-Pyroxene Thermometer: Correlation of Apparent Temperature with AL2O3 in Augite
D. J. Andersen, D. H. Lindsley 		  1004

A Statistical Study of Fracture Inheritance during the Volcano-Tectonic Evolution of Tharsis Region in Mars
R. C. Anderson, R. Venkatakrishnan 		  1005

Displacement, Ablation, and Meteorite Concentrations at the Allan Hills Icefield, 1978 TO 1982
J. O. Annexstad 		  1006

Willy: a Prize Noble Fremdling
J. T. Armstrong, A. El Goresy, G. P. Meeker, G. J. Wasserburg 		  1007

Disturbed MG Isotopic Systematics in Allende CAI
J. T. Armstrong, I. D. Hutcheon, G. J. Wasserburg 		  1008

Cooling History of Apollo 15 Green Glasses: Implications for Their Formation
J. Arndt, W. V. Engelhardt, I. Gonzalez-Cabeza, B. Meier 		  1009

Ancient Martian Cratered Terrain Materials Exposed by Deflation Northwest of the Baldet and Antoniadi Basins
R. Arvidson, E. Guinness, C. Leff, M. Presley, R. Saunders, L. Roth 		  1010

Impact Cratering Experiments for Ejecta Kinematics Analysis
M. G. Austin 		  1011

Morphometry of Small Valley Networks on Mars
V. R. Baker, J. B. Partridge 		  1012

Pristine and Degraded Segments of Small Valley Networks on Mars
V. R. Baker, J. B. Partridge 		  1013

Annealing Studies of the Thermoluminescence Sensitivity of Chondrites: Relevance to the Metamorphic and Shock/reheating History of Meteorites
N. Bakhtiar, W. E. Brandon, R. K. Guimon, B. D. Keck, K. K. Saebo, K. S. Weeks, D. W. G. Sears 		  1014

The State of Stress in Venus' Lithosphere from Long Wavelength Gravity and Topography
W. B. Banerdt, R. S. Saunders 		  1015

Iron-Montmorillonite Spectral Analogy to Mars Soil
A. Banin, L. Margulies, Y. Chen 		  1016

The Effect of Trapped Liquid Crystallization on Cumulus Mineral Compositions in Layered Intrusions
S. J. Barnes 		  1017

Asteroids Photometry Simulated in the Laboratory: Phase Functions of Some Meteorites Used as Irregular Asteroid Models
M. A. Barucci, M. Fulchignoni, R. Salvatori 		  1018

Polycyclic Aromatic Hydrocarbons in the Murchison Meteorite
B. P. Basile, B. S. Middleditch, J. Oro 		  1019

Geophysical Tests of Two Chemical Models for the Earth's Upper Mantle
J. D. Bass, D. L. Anderson 		  1020

The Elemental Composition of Extraterrestrial Stony Deep Sea Spheres
B. A. Bates, D. E. Brownlee 		  1021

Comparison of Solar Wind Gases in Two Lunar Ilmenites of Different Antiquities
R. H. Becker, R. C. Wiens, R. O. Pepin 		  1022

Callisto: Jupiter's Iapetus?
J. F. Bell 		  1023

Composition of the D-Type Asteroids Derived from Infrared Spectrophotometry
J. F. Bell, B. R. Hawke, M. J. Gaffey 		  1024

The Olivine Asteroids: Discovery, Mineralogy, and Relationship to Meteorites
J. F. Bell, B. R. Hawke, R. B. Singer, M. J. Gaffey 		  1025

Isotope and Track Production in Meteorites and Cosmic Ray Variations
N. Bhandari 		  1026

26AL/53MN Depth Profile and its Implications to Lunar Surface Processes
N. Bhandari, P. N. Shukla 		  1027

Tectonics of the Grooved Terrain on Ganymede
R. Bianchi, R. Casacchia, S. Pozio 		  1028

Venus: Gravity, Topography and Isostasy
B. G. Bills 		  1029

Comments on the Bulk Composition Model of the Moon Proposed by Delano and Lindsley
A. Binder 		  1030

Experimental Shock-Lithification of Chondritic Powder: Implications for Ordinary Chondrite Regolith Breccias
A. Bischoff, M. A. Lange 		  1031

Clast Population Statistics of the Lunar Meteorite ALHA81005
A. Bischoff, D. Stoffler 		  1032

Feasibility of Determining Impact Conditions from Total Crater Melt
M. D. Bjorkman 		  1033

Analysis of Individual Agglutinate Particles from Apollo Soil 61181 and Implications for Agglutinate Formation
D. P. Blanchard, R. V. Morris 		  1034

Cosmic Ray Exposure of SNC Achondrites and Constraints on Their Derivation from Mars
D. D. Bogard, So-P. Johnson, L. E. Nyquist 		  1035

Reduced Forms of Elements Inside Mineral Grains of Lunar Regolith
O. A. Bogatikov, N. A. Ashikhmina, D. I. Frikh-Khar, E. N. Lubnin, Yu. Ya. Tomashpolsky, L. Ya. Karpov, V. A. Stepanchikov, I. V. Kurchatov 		  1036

Anorthosites of the Earth and Moon
O. A. Bogatikov, M. S. Markov, M. K. Suchanov 		  1037

The K/t Boundary Clay Layer: Fallout from a Stony Asteroid Impact
B. Bohor, E. Foord, So-P. Modreski, D. Triplehorn 		  1038

Provenance of the Various Impact Melt Lithologies and of Their Plagioclase Clasts at North Ray Crater, Apollo 16
R. Borchardt 		  1039

The Picket Pin Pt/pd Zone, Stillwater Complex, Montana
A. E. Boudreau, I. S. McCallum 		  1040

Flux and Bedforms of Windblown Material on Venus
S. Bougan, R. Greeley, J. Marshall 		  1041

Characterization and Gas Analysis of Fluid Inclusions in Archean Barites from the Warrawoona Group, Northwestern Australia
W. L. Bourcier, E. K. Gibson, R. K. Kotra 		  1042

Gravity Field of Venus at Constant Altitude and Comparison with Earth
C. Bowin, G. Abers, L. Shure 		  1043

Basin Ring Spacing on the Planets: New Data from Venus
J. M. Boyce, R. J. Pike, P. D. Spudis 		  1044

Mantle Uplift Beneath Lunar Basins: Clues to the Understanding of Basin Formation
S. R. Bratt, S. C. Solomon, J. W. Head, C. H. Thurber 		  1045

The Geology of East - Rhyolitic Dome of the Eastern Snake River Plain, Idaho
J. E. Bretches, J. S. King 		  1046

Siderophile Elements may not BE Enriched in the Upper Mantle: Speculations on Protocore Separation
R. Brett 		  1047

Point Count Analysis of Interplanetary Dust and Fine Grained Meteoritic Materials
D. E. Brownlee, M. M. Wheelock, J. P. Bradley 		  1048

Spectral Effects of Natural Shock on Plagioclase Feldspar
E. A. Bruckenthal, C. M. Pieters 		  1049

Neutron-Induced Gamma Rays from Thin Targets: Simulations for Planetary Spectroscopy
J. Bruckner, R. C. Reedy, H. Wanke 		  1050

CAI Rims and CM2 Dustballs: Products of Gas-Grain Interactions, Mass Transport, Grain Aggregation and Accretion in the Nebula?
T. E. Bunch, S. Chang 		  1051

Impacts, Magnetic Field Reversals and Tectonic Episodes
P. J. Burek 		  1052

Maxwell Montes in - Collisional Plateau on Venus?
K. Burke, C. Sengor, P. Francis 		  1053

The Relative Mass Flux of Micrometeorites and the Solar Wind
D. S. Burnett, C. Polanskey 		  1054

Hibonite: Crystal Chemistry and Origin of Blue Coloration in Meteoritic Assemblages
R. G. Burns, V. M. Burns 		  1055

The Early Evolution of the Lunar Grid System
W. Buser 		  1056

Hydrogen Abundances in Lunar Soils
R. Bustin, R. K. Kotra, E. K. Gibson, G. A. Nace, D. S. McKay 		  1057

Laser Extraction of Neon from Dimmitt: Preliminary Report
M. W. Caffee, C. M. Hohenberg, T. D. Swindle 		  1058

Interpretation of Structural Fabric in the Leoville Carbonaceous Chondrite
P. M. Cain, H. Y. McSween 		  1059

The Rapid Dissipation Phase of the Primitive Solar Nebula
A. G. W. Cameron 		  1060

The Surface of Venus: Recent Radar Observations
D. B. Campbell, J. K. Harmon, A. A. Hine, J. W. Head 		  1061

High-Resolution Topographic Profiles of Devana Chasma in the Beta-Phoebe Region, Venus
D. B. Campbell, J. W. Head, J. K. Harmon 		  1062

Volcanism and Rift Formation in Beta Regio, Venus: New Radar Results
D. B. Campbell, J. W. Head, J. K. Harmon, A. A. Hine 		  1063

Fluorine, Chlorine and Sulfur Variations in an Archean Basalt Suite
J. A. Canepa, C. B. Moore 		  1064

Relaxation and Free Modes of a Self-Gravitating Planet
M. Caputo 		  1065

Nitrogen Isotopic Composition of Osbornite from the Bustee Meteorite
L. P. Carr, C. T. Pillinger 		  1066

Formation of Martian Valley Networks as a Consequence of Large Impacts
M. H. Carr 		  1067

Stable Isotope Measurements on Indarch Acid Residues
R. H. Carr, L. P. Carr, I. P. Wright, C. T. Pillinger, J. Crabb 		  1068

Carbon Isotope Data for Some SNC Meteorites
R. H. Carr, C. T. Pillinger 		  1069

Carbon Isotopic Analysis of Individual Cosmic Dust Particles
R. H. Carr, I. P. Wright, C. T. Pillinger, D. E. Brownlee 		  1070

Sulfur Solubility and Anhydrite Saturation in Hydrous Magmas
M. R. Carroll, M. J. Rutherford 		  1071

A Monte Carlo Model of Lunar Regolith
J. Cashore, A. Woronow 		  1072

The Summit Calderas of Alba Patera, Mars
P. Cattermole, C. Reid 		  1073

The Origin of Excess 107AG in Gibeon (iva) and Other Iron Meteorites
J. H. Chen, G. J. Wasserburg 		  1074

Global and Regional Ridge Patterns on Mars
A. F. Chicarro, P. H. Schultz 		  1075

The Origin of Regional Dust Deposits on Mars
P. R. Christensen 		  1076

Thermal Emissivity of the Martian Surface: Evidence for Compositional Variations
P. R. Christensen 		  1077

Mineralogy of Platelet Grains in Carbon-Rich CP Interplanetary Dust Particles
R. Christoffersen, P. R. Buseck 		  1078

A Method for Evaluating Shock Propagation and its Thermal Effects during Impact Events
M. J. Cintala 		  1079

Energy Partitioning during Terrestrial Impact Events: Melt Production and Scaling Laws
M. J. Cintala, R. A. F. Grieve 		  1080

Catastrophic Rupture Experiments: Fragment-Size Analysis and Energy Considerations
M. J. Cintala, F. Horz 		  1081

Regolith Evolution Experiments i: Grain-Size Evolution
M. J. Cintala, F. Horz, T. H. See, F. Cardenas, T. D. Thompson 		  1082

SEM Studies of Whitlockite and Chromite in Metal-Sulfide Droplets in a c3 Allan Hills Meteorite and Their Implications
E.-H. Cirlin 		  1083

Glass in Chondrules: Effects of Alteration on the Apparent Distribution Coefficient KD of fe and MG at Olivine/glass Interfaces
E.-H. Cirlin, L. A. Taylor 		  1084

Using New Radar Reflectivity Maps to Characterize Features Mercury
P. E. Clark, M. E. Strobell, G. G. Schaber, R. F. Jurgens 		  1085

Live 26AL in Today's Interstellar Medium and its Relationship to the Extinct Radioactivities and the Isotopic Anomalies in Meteorites
D. D. Clayton 		  1086

Neutron Capture in Allende: a Numerical Study of Nuclear Data
D. D. Clayton, M. H. MacGregor, R. J. Howerton 		  1087

Oxygen Isotopes in Enstatite Chondrites
R. N. Clayton, T. K. Mayeda, A. E. Rubin 		  1088

The Spectral Properties of Olivine-Pyroxene Mixtures
E. A. Cloutis, M. J. Gaffey, T. L. Jackowski, K. L. Reed 		  1089

Use of a Planetary Boundary Layer Model for Martian Paleoclimates
G. D. Clow 		  1090

REE Between Olivine and Melt: a Proposed Substitution Mechanism
R. O. Colson, L. A. Taylor, G. A. McKay 		  1091

Ordinary Chondrite Pyroxene Thermometry -- One More Time
M. T. Colucci, R. H. Hewins 		  1092

Age and Chemistry of Zircon from Late-Stage Lunar Differentiates
W. Compston, I. S. Williams, C. Meyer 		  1093

Simulation of Asteroidal Fragmentation by Impacting at Hypervelocity Free Falling Targets
M. Coradini, F. Capaccioni, P. Cerroni, E. Flamini, G. Martelli, P. N. Smith, A. J. Woodward 		  1094

Cosmic Dust Collection with a Tethered Satellite
G. J. Corso 		  1095

Scaling of Complex Craters
S. K. Croft 		  1096

- Carbonaceous Chondrite Related to c1 and c2 Chondrites
A. M. Davis, E. Olsen 		  1097

Asteroid Collisional Evolution Studies
D. R. Davis, C. R. Chapman, S. J. Weidenschilling, R. Greenberg 		  1098

Photoclinometry: Analysis of Inherent Errors and Implications for Topographic Measurements
P. A. Davis, A. S. McKewen 		  1099

Global Units on Venus Derived from Statistical Analysis of Pioneer Venus Radar Data
P. A. Davis, G. G. Schaber 		  1100

Search for Extraterrestrial Dust Grains in Polar Ices
M. de Angelis, L. Fehrenbach, C. Hammer, C. Jehano, M. Maurette 		  1101

Search for Stratospheric Dust Grains in Polar Ices
M. de Angelis, L. Fehrenbach, C. Hammer, C. Jehano, M. Maurette 		  1102

Inversion of Topography in Martian Highlands Terrains
R. A. de Hon 		  1103

Progressive Impact Cratering
R. A. de Hon 		  1104

Why did so Many Polymict Eucrites Land and Survive Only in Antarctica?
J. S. Delaney 		  1105

Phosphate Minerals in Eucrites
J. S. Delaney, C. O'Neill, M. Prinz 		  1106

Two Magma Types in the Eucrite Bouvante
J. S. Delaney, C. O'Neill, M. Prinz 		  1107

Allan Hills A81001, Cumulate Eucrites and Black Clasts from Polymict Eucrites
J. S. Delaney, M. Prinz, C. E. Nehru, C. P. Stokes 		  1108

The Allan Hills 81-SERIES of Polymict Eucrites
J. S. Delaney, M. Prinz, C. P. Stokes 		  1109

"genesis Glass": in Search of the Holy Grail
J. W. Delano 		  1110

Vesicles in Four Varieties of Apollo 15 Volcanic Glass
J. W. Delano 		  1111

Isotopic and Chemical Characteristics of Cretaceous-Tertiary Boundary Sediments from DSDP Site 465A
D. J. Depaolo, F. T. Kyte 		  1112

Origin and Depth of Titan's Hydrocarbon Ocean
S. F. Dermott, So-P. Gierasch, J. Gradie, C. Sagan, W. R. Thompson 		  1113

Apollo 14 Aluminous Mare Basalts and Their Link to KREEP
T. Dickinson, G. J. Taylor, K. Keil, R. A. Schmitt, M. R. Smith, S. S. Hughes 		  1114

Selective Evaporation of Rocks and Minerals Induced by a Laser Impulse
Yu. P. Dikov, M. V. Gerasimov, L. M. Mukhin, V. I. Rekharsky 		  1115

Fe-Ni Variation in L-Chondrites
R. T. Dodd, E. Jarosewich, A. Ruzicka 		  1116

On Orientation of the Magnetic Dipole of Mars
Sh. Sh. Dolginov, L. N. Zhuzgov, V. A. Sahrova 		  1117

High Temperature Electrical Conductivity of the Carbonaceous Chondrites Allende and Murchison
A. G. Duba, J. N. Boland 		  1118

Flow and Fracture of H2O Ices ih, ii, and Iii: Latest Experimental Results
W. B. Durham, S. H. Kirby, H. C. Heard 		  1119

Quenching Effects on Iron Site Partitioning in the Apollo 17 Orange Glass Composition
M. D. Dyar 		  1120

Venus Highlands: Characteristics of Aphrodite Terra and Comparisons to Beta Regio and Ishtar Terra
W. J. Ehmann, J. W. Head 		  1121

Chemical Studies of Volatilization Residues of Chondrites
V. Ekambaram, L. Grossman, E. A. King 		  1122

Allende 5241: Anatomy of a Fremdlinge-Rich CAI
A. El Goresy, J. T. Armstrong, G. J. Wasserburg 		  1123

A Petrographic Study of Gibeon and Santa Clara Iron Meteorites: Possible Clues to 107PD-107AG Systematics
A. El Goresy, J. T. Armstrong, G. J. Wasserburg, J. H. Chen 		  1124

Volcanoes of the Kane Patera Quadrangle of io Classified by Proportions of Lava Flows to Pyroclastic Flows
W. E. Elston 		  1125

The Spatial Distribution of Spallogenic 53MN in the Keyes Chondrite
P. Englert 		  1126

MANGANESE-53 and BERYLLIUM-10 Contents of Tektites
So-P. Englert, D. K. Pal, C. Tuniz, R. K. Moniot, W. Savin, T. H. Kruse, G. F. Herzog 		  1127

Correlated REE an MG Anomalies in Allende Inclusions
T. M. Esat, S. R. Taylor 		  1128

Free FUN with MG in Allende Group II Inclusions
T. M. Esat, S. R. Taylor 		  1129

235U-136XE Dating: Early Exposure of Basalt 12053 and Reliability of the Dating Method
O. Eugster 		  1130

Complex Exposure History of Basalt 12053
O. Eugster, So-P. Eberhardt, J. Geiss, H. Schwaller 		  1131

ALUMINUM-26 Measurements on Antarctic Meteorites
J. C. Evans, J. H. Reeves 		  1132

The Origin and Mineral Chemistry of Group II Inclusions in Carbonaceous Chondrites
B. Fegley, A. S. Kornacki 		  1133

Mineral Chemistry of a Large Spinel-Rich Inclusion in the Kaba CV3 Chondrite
B. Fegley, J. E. Post, J. A. Peck 		  1134

Evolution of Sulfur to the Surface of IO
A. A. Finnerty 		  1135

CARBON-14 Terrestrial Ages of Yamato and ALHA Meteorites
E. L. Fireman 		  1136

Petrology of Apollo 16 Dimict Breccia 61015
M. K. Flohr, O. B. James 		  1137

Systematic Variations in the Properties of Subkilometer Cones in Acidalia Planitia
H. Frey, A. M. Semeniuk 		  1138

Shock-Induced Volatile Loss from a Carbonaceous Chondrite and Planetary Accretion
B. Frisch, T. J. Ahrens 		  1139

Seamarc II Side-Scan Sonar Images of Volcaniform Features in the Mariana Fore-Arc and Arc Regions: Potential Analogues for Venus
So-P. Fryer, D. M. Hussong, P. J. Mouginis-Mark 		  1140

40ARGON-39ARGON Age of Lunar Rock from Mare Crisium
M. M. Fugzan, D. V. Minh, L. S. Tarasov, G. M. Kolesov, Yu. A. Shukolyukov 		  1141

Partition Coefficients of hf, zr, and REE Between Zircon, Apatite and Liquid and Their Inferences to Lunar Granite Petrogenesis
H. Fujimaki, M. Tatsumoto, K. Aoki 		  1142

Partition Coefficients of hf, zr, and REE Between Ilmenite and Liquid
H. Fujimaki, M. Tatsumoto, G. McKay, J. Wagstaff 		  1143

The S-Type Asteroids and the Ordinary Chondrites: the (8)FLORA Case
M. J. Gaffey 		  1144

Dust on Venus: Geological Implications
J. B. Garvin 		  1145

A Comparison of Theoretical Mineral Equilibria and Pioneer-Venus Radar Data
J. B. Garvin, R. A. Fogel, R. A. F. Grieve, J. W. Head 		  1146

Regional Geology of the Beta-Phoebe Region on Venus
J. B. Garvin, J. W. Head, A. T. Basilevsky 		  1147

Venera Lander Site Geologic Characteristics from Pioneer-Venus Radar Measurements
J. B. Garvin, J. W. Head, A. T. Basilevsky 		  1148

Venus: Global Distribution of Radar Roughness and Reflectivity and Correlations with Elevation
J. B. Garvin, J. W. Head, G. H. Pettengill, S. Zisk 		  1149

Venus: the Nature of the Surface from Venera Panoramas
J. B. Garvin, J. W. Head, M. T. Zuber, P. Helfenstein 		  1150

Studies of the Chemical Composition of Gaseous Phase Released from Laser Pulse Evaporated Rocks and Meteorite Materials
M. V. Gerasimov, L. M. Mukhin 		  1151

Amino Acids, Carbon and Sulfur Abundances in Antarctic Carbonaceous Chondrites
E. K. Gibson, J. R. Cronin, R. K. Kotra, T. M. Primus, C. B. Moore 		  1152

Salts in the Dry Valleys of Antarctica
E. K. Gibson, B. J. Presley, J. Hatfield 		  1153

Carbon and Sulfur Abundances in Antarctic Carbonaceous Chondrites, Ordinary Chondrites, Eucrites, and the Martian Shergottite
E. K. Gibson, T. M. Primus, R. K. Kotra 		  1154

Why are There no Strike-Slip Faults on the Planets and Satellites
M. P. Golombek 		  1155

Low-Temperature Aqueous Alteration in the Early Solar System: Possible Clues from Meteorites Weathered in Antarctica
J. L. Gooding 		  1156

Search for "MARTIAN(?) Weathering" Effects in Achondrites EETA79001 and ALHA77005: Complications from Antarctic Weathering
J. L. Gooding 		  1157

The Formation of Metallic Iron in Mafic Magmas: the Role of Carbon (clues from Native Iron in Disko Island Basalts)
C. A. Goodrich 		  1158

An Apatite-Rich Lithology from Lunar Meteorite ALHA81005--An Example of Magma Mixing?
C. A. Goodrich, G. J. Taylor, K. Keil 		  1159

Petrology and Chemistry of Hyper-Ferroan Anorthosite and Other Clasts from Lunar Meteorite ALHA81005
C. A. Goodrich, G. J. Taylor, K. Keil, W. V. Boynton, D. H. Hill 		  1160

Petromagnetic Features of Impactites
E. S. Gorshkov, V. A. Starunov, A. I. Raikhlin 		  1161

Spectral Reflectance of Sodium Sulfide: a Colorant on Io?
J. Gradie, J. Moses 		  1162

Mauna Loa 1950 Sulfur Flow as an Analog for Fumarolic Flows on IO
R. Greeley, E. Theilig, P. Christensen 		  1163

A Test of a Model for the Development of Terrestrial Simple Craters
R. A. F. Grieve, J. B. Garvin 		  1164

Considerations of Large Scale Impact and the Early Earth
R. A. F. Grieve, E. M. Parmentier 		  1165

Metamorphism, Fragmentation, and Reassembly of Chondrite Parent Bodies: a Penecontemporaneous View
R. E. Grimm 		  1166

Spectral Analysis of Groove Spacing on Ganymede
R. E. Grimm, S. W. Squyres 		  1167

The Moon as Cause of the Formation of Earth's Continents: Complementary Elements
T. Grjebine 		  1168

The Interplanetary Meteoroid Flux at 1 AU
E. Grun, H. Fechtig, H. A. Zook, R. H. Giese 		  1169

Formation of Ilyinets Crater Bombs: the Role of High-Temperature Condensation
E. P. Gurov, E. P. Gurova 		  1170

Meteoroidal Bombardment of Planetary Satellites as a Source of Magnetospheric Mass in the Outer Solar System
P. K. Haff 		  1171

Oxygen Isotopes in Type 3 Ordinary Chondrites
J. Halbout, M. Javoy, F. Robert 		  1172

Elysium Region, Mars: Tests of Lithospheric Loading Models for the Formation of Tectonic Features
J. L. Hall, S. C. Solomon, J. W. Head 		  1173

Mercury Radar Altimetry: a Preliminary Analysis
J. K. Harmon, D. B. Campbell, J. W. Head, D. L. Bindschadler, I. I. Shapiro 		  1174

Some Thoughts on the VEGA Particulate Shell
A. W. Harris 		  1175

Solar Noble Gas Component in Glassy Submarine Basalts
R. Hart, L. Hogan 		  1176

Does "saturation" Cratering Exist in the Solar System?
W. K. Hartmann 		  1177

Spectral Reflectance Studies of the Orientale Region of the Moon: Preliminary Results
B. R. Hawke, E. Cloutis, So-P. Owensby, P. Lucey, J. F. Bell, P. D. Spudis 		  1178

Spectral Reflectance Studies of the Hadley-Apennine (apollo 15) Region: Preliminary Results
B. R. Hawke, P. Lucey 		  1179

Active Venting of Europa?: Analysis of a Transient Bright Surface Feature
So-P. Helfenstein, A. F. Cook 		  1180

Photometric Classification of Terrain Units on Ganymede and Implications for the Galileo Mission
So-P. Helfenstein, L. Wilson, N. Walker 		  1181

International Near-Earth Asteroid Search
E. F. Helin, R. S. Dunbar 		  1182

Production of the Lunar Magma Ocean by Fractionation of the Interior
F. Herbert 		  1183

Formation of Saturn's E-Ring by Evaporation of Liquid from the Surface of Enceladus
K. E. Herkenhoff, D. J. Stevenson 		  1184

The Case for Melting in Plagioclase-Poik Mesosiderites
R. H. Hewins, T. A. Harriott 		  1185

A Search for 60FE in Meteorites Using the Ion Probe Microanalyser
R. W. Hinton, D. E. Scatena-Wachel, A. M. Davis 		  1186

On Crater Dynamics: Comparisons of Results for Different Target and Impactor Conditions
K. A. Holsapple 		  1187

Generation of Transient Magnetic Fields in Hypervelocity Meteoriod Impacts with Application to Lunar Paleomagnetism
L. L. Hood 		  1188

Pulsed Neutron-Gamma Spectroscopy for Chemical Analysis on Remote Bodies
R. A. Hoover, L. G. Evans, J. I. Trombka, F. E. Senftle 		  1189

Planetocentric Versus Heliocentric Impacts in the Jovian and Saturnian Satellite System
G. P. Horedt, G. Neukum 		  1190

The Effect of Atmospheric Drag as a Function of Elevation on the Emplacement of Impact Crater Ejecta on Venus
V. M. Horner, R. Greeley 		  1191

Cratering Flow Fields: a General Form and the Z Model
K. Housen 		  1192

Scanning Electron Microscope Studies of the Vigarano CV3 Chondrite: Large Forsterite Grains
R. M. Housley 		  1193

Characteristics of Remelted Allende Chondrules and Matrix
R. M. Housley, E.-H. Cirlin 		  1194

A Preliminary Dynamic Model for Planetary Differentiation
A. T. Hsui 		  1195

Confirmation of Zr-Hf Fractionation in Lunar - Interim Report
S. S. Hughes, R. A. Schmitt 		  1196

Excess 41K in Allende Cai: Confirmation of a Hint
I. D. Hutcheon, J. T. Armstrong, G. J. Wasserburg 		  1197

Magnetite Morphologies in the Essebi and Haripura CM Chondrites
M. Hyman, M. W. Rowe, E. B. Ledger 		  1198

Petrology of the YAMATO-7308 Howardite
Y. Ikeda, H. Takeda 		  1199

The Kaidun Polymict Carbonaceous Breccia: the Mixture of Incompatible Types of Meteorites
A. V. Ivanov, A. A. Ulyanov, A. Ya. Skripnic, N. N. Konokona 		  1200

Anorthosititc Oceanic Crust in the Archean Earth
E. Jagoutz, J. B. Dawson, S. Hoernes, B. Spettel, H. Wanke 		  1201

Duricrusts on Mars: Evidence from Thermal, Radio, and Radar Data
B. M. Jakosky, P. R. Christensen 		  1202

Mars Atmospheric Photochemistry, Surface Reactions, and Climate Change
B. M. Jakosky, B. L. Lindner 		  1203

Limits of the Lithospheric Thickness of the Elysium Area on Mars from Correlations of Surface Stresses with the Lineament System
So-P. Janle, F. Roth, J. Voss 		  1204

Ages of Jilin (H5) and the Temperature at the Separation from its Parent Body
E. K. Jessberger, J. Oehm, N. Mueller 		  1205

The Ammonia-Water Phase Diagram i: Water-Rich Region at Low (<4 Gpa) Pressure
M. L. Johnson, A. Schwake, M. Nicol 		  1206

An Application of a Strategy for Interpretation of Multispectral Reflectance Data from Planetary Surfaces
P. E. Johnson, M. O. Smith, J. B. Adams 		  1207

Heat Flow from Io: Longitudinal Distribution
T. V. Johnson, D. Morrison, D. L. Matson, G. J. Veeder, R. H. Brown, R. M. Nelson 		  1208

Xe in Etched Colloidally Separated Murray and Murchison
C. M. Jones, G. R. Lumpkin, M. Dziczkaniec, J. Olsen 		  1209

The Chemical Signature of Core Formation in the Earth's Mantle
J. H. Jones, M. J. Drake 		  1210

Orcus Patera and its Surroundings: a Squeezed Zone Between Two Mega-Aureoles
H. Jons 		  1211

Sedimentary Basins and Mud Flows in the Northern Lowlands of Mars
H. Jons 		  1212

Volcanogenic Trace Element Volatiles in Basalts
S. Jovanovic, G. W. Reed 		  1213

Accelerator Measurement of CARBON-14 Ages of Antarctic Meteorites
A. J. T. Jull, T. H. Zabel, D. J. Donahue, E. L. Fireman 		  1214

Are 48CA Anomalies Endemic or Ubiquitous in Allende Cai's?
M. H. A. Jungck, T. Shimamura, G. W. Lugmair 		  1215

Compositional-Petrographic Study of Ordinary Chondrites
G. W. Kallemeyn, J. T. Wasson 		  1216

A Crater Chain on Enceladus: Evidence for Explosive Water Volcanism
J. S. Kargel 		  1217

Evidence for Regolith Maturation on Asteroids
T. V. V. King, M. J. Gaffey, L. A. McFadden 		  1218

Consortium Breccia 14321: Petrology of the Pristine Highland Clasts
S. A. Knapp, J. W. Shervais, L. A. Taylor 		  1219

Geomorphology of Protonilus Mensae Region: Wasting Away on Mars
R. C. Kochel, R. T. Peake 		  1220

Rigidity of the Crust and Tectonic Pattern in the North-West the Congo Craton South-East of Cameroon)
G. G. Kochemasov 		  1221

The Latest Data Concerning the Hypothesis of Accretion of Primary Layered Planets of Different Compositions in the Solar System
G. G. Kochemasov 		  1222

WC Stars as Possible Sources for Ne-E
C. Koeberl 		  1223

Geochemistry of Muong-Nong Type Tektites II: Lithium, Beryllium, and Boron
C. Koeberl, R. Berner, F. Kluger 		  1224

Geochemistry of Muong-Nong Type Tektites Iii: Selected Elemental Abundances
C. Koeberl, F. Kluger, R. Berner, W. Kiesl 		  1225

Geochemistry of Muong-Nong Tektites i: Fluorine and Bromine
C. Koeberl, F. Kluger, W. Kiesl, H. H. Weinke 		  1226

Modal Composition and Texture of Highland Rock Fragments from Apollo 16 Sample 63500
M. I. Korina 		  1227

The Identification of Group II Inclusions by Electron Probe Microanalysis
A. S. Kornacki 		  1228

The Mineral Chemistry and Origin of Allende Inclusion Matrix and Meteorite Matrix: Non-Equilibrium Condensates from Oxygen-Rich Gas
A. S. Kornacki 		  1229

The Mineralogy of Spinel-Rich Allende Inclusions: Indicator of the Oxidation State of the Solar Nebula
A. S. Kornacki 		  1230

Mineralogy and Origin of Melilite-Rich Rimmed Complex Cai's in the Allende Meteorite
A. S. Kornacki, B. Fegley, J. A. Peck 		  1231

Mare Basalt Layers in Lower Half of Apollo 16, Station 4 Double Drive Tube (64001)
R. L. Korotev 		  1232

Cooling Rates and Assimilation Processes of Micrometeoritic Impact Melts in the Lunar Regolith
D. A. Kring 		  1233

Chemical Gradients in Glass Adjacent to Olivine in Experimental Charges and Apollo 15 Green Glass Vitrophyres
D. A. Kring, G. A. McKay 		  1234

The Galactic Nucleosynthesis of Deuterium and HELIUM-3
R. I. Kyznetsova, A. K. Lavrukhina 		  1235

Finite Element Model for Lithospheric Thinning by a Mantle Plume
So-P. Lanciano, G. Schubert 		  1236

The Apollo 17 Drill Core (sections 70009-70001): a Test for Indigenous Versus Transported Agglutinates
J. C. Laul, M. R. Smith, J. J. Papike, S. B. Simon 		  1237

On the Origin of Ccf-Xe in Carbonaceous Chondrites
A. K. Lavrukhina 		  1238

Early History of the Allende CV and Kainsaz CO Carbonaceous Chondrites
A. K. Lavrukhina, L. L. Kashkarov, N. N. Korotkova, G. V. Kalinina, V. G. Kashkarova 		  1239

Impact Induced Matter Transformation: Experiments
A. K. Lavrukhina, Z. K. Milnikova 		  1240

Xenon Components in the Carbonaceous Chondrite Kainsaz CO
A. K. Lavrukhina, Yu. A. Shukolyukov, D. Vu Minh, A. V. Fisenko, L. F. Semjonova 		  1241

Apollo 14 VLT Glass Revisited: Behavior of Fe-Rich Liquids at High Pressure
D. H. Lindsley, C. Podpora, C. A. Russ 		  1242

Electrical Conductivity of Simulated Lunar Melts
D. J. Lindstrom, R. H. Lewis, L. A. Haskin 		  1243

Magnesian Anorthosites and Other Clasts from Complex Breccia 14321
M. M. Lindstrom 		  1244

Ultra-Kreepy Melt Rocks, Ree-Rich Norites and a Diverse Suite of Clasts from Apollo 16 Breccias
M. M. Lindstrom 		  1245

Volatile/mobile Trace Elements in H4-6 Chondrites: a Progress Report
D. W. Lingner, T. J. Huston, M. E. Lipschutz 		  1246

Dynamic Crystallization Experiments on Chondrule Melts of Radial Pyroxene Composition
G. E. Lofgren, Q. Kinnebrew, W. J. Russell 		  1247

Dynamic Crystallization Experiments on Chondrule Melts of Porphyritic Pyroxene Composition
G. E. Lofgren, W. J. Russell, Q. Kinnebrew 		  1248

A Two-Stage Model for Lunar Anorthosites: an Alternative to the Magma Ocean Hypothesis
J. Longhi, L. D. Ashwal 		  1249

A Late Climatic Change on Mars
B. K. Lucchitta 		  1250

Near-Infrared Spectral Reflectance Studies of Localized Lunar Dark Mantle Deposits
So-P. Lucey, L. Gaddis, J. Bell, B. R. Hawke 		  1251

Xenon in Hand-Picked Separates from Murchison: Similar Isotopic Patterns in Diverse Fractions
G. Lux 		  1252

Diffusional Fractionation of Light Nuclei in the Solar Atmosphere
J. M. D. MacElroy, O. K. Manuel 		  1253

Poorly Characterized Phase in C2M Carbonaceous Chondrites: Proposed Structures and Significance
I. D. R. MacKinnon, M. E. Zolensky 		  1254

New Mineralogical Studies of Refractory Inclusions in Murchison
G. J. MacPherson, A. Hashimoto, M. Bar-Matthews, L. Grossmam 		  1255

On the Model of Formation of the Radially Heterogeneous Earth and the Iron-Depleted Moon: Behavior of Solid Particles in the Presence of Gas and Large Gravitating Bodies
A. B. Makalkin 		  1256

Formation of the Bellsbank Trio Iron Meteorites as Immiscible P-Rich Liquid Pockets on the Crystallizing Floor of the IIA Core
D. J. Malvin, So-P. Zong, J. T. Wasson 		  1257

The Role of the Vaporization Process in the Impact-Accretion History of the Moon
O. M. Markova, O. I. Yakovlev, A. N. Belov, G. A. Semenov 		  1258

Cosmic Ray Exposure Ages of Iron Meteorites, Complex Irradiation and the Constancy of Cosmic Ray Flux in the Past
K. Marti, B. Lavielle, S. Regnier 		  1259

A Transient Heating Event in the History of a Highlands Troctolite in Apollo Soil 12033
U. B. Marvin, D. Walker 		  1260

Zhamanshin Impact Crater (western Kazakhstan): Additional Geological Data
V. L. Masaitis, Ya. I. Boiko, E. P. Izokh 		  1261

The Formation of an Impact-Generated H20 Atmosphere and its Implications for the Early Thermal History of the Earth
T. Matsui, Y. Abe 		  1262

On the Brittle-Ductile Behavior of Iron Meteorites: New Experimental Constraints
T. Matsui, P. H. Schultz 		  1263

Structure and Morphology of the Ancient Cratered - Plains Boundary Zone in the Eastern Hemisphere of Mars
T. A. Maxwell, S. J. Barnett 		  1264

Estimation of Trapped Liquid Contents in the Stillwater Complex
I. S. McCallum 		  1265

Exogenic and Endogenic Patterns on Europa
A. S. McEwen 		  1266

Experimental and Theoretical Modeling of Hot SPOT Thermotectonics
A. S. McEwen, J. Roller 		  1267

High-Resolution Color Images of IO
A. S. McEwen, L. A. Soderblom 		  1268

Maturity of Regolith Breccias as Revealed by Ferromagnetic and Petrographic Indices
D. S. McKay, R. V. Morris, S. J. Wentworth 		  1269

Partitioning of Hafnium and Zirconium Between Ilmenite, Armalcolite, Pigeonite, and High-Ti Mare Basaltic Melt
G. McKay, J. Wagstaff 		  1270

On the Distribution of Excess Deuterium in Renazzo and Semarkona: an Ion Microprobe Study
K. D. McKeegan, E. Zinner 		  1271

Viscous Relaxation in Icy Satellites
W. B. McKinnon, M. Gurnis 		  1272

A Speed Limit for Impact-Ejected Spalls
H. J. Melosh 		  1273

On the Forms of Carbon and Nitrogen in the Gas Phase of the Preplanetary Nebula
R. A. Mendybaev, V. A. Dorofeyeva, A. B. Makalkin, A. K. Lavrukhina, I. L. Khodakovsky 		  1274

600 Mev Proton Irradiation Experiment to Simulate the 4(PI) Bombardment of Meteorites by Galactic Protons
R. Michel, P. Dragovitsch, R. Stuck, D. Filges, P. Cloth 		  1275

Some Peculiarities of the Chemical Composition of Minerals in Shock-Metamorphised L-Chondrites
L. F. Migdisova, N. I. Zaslavskaya 		  1276

Asymmetry in the Structure and Evolution of the Terrestrial Planets
E. E. Milanovsky, A. M. Nikishin 		  1277

Differences in the Formation Mechanism of Rifts of the Earth and of Rifts in the Valles Marineris System of Mars
E. E. Milanovsky, A. M. Nikishin 		  1278

Primary Rifting and Oceanogenesis in the Earth's History: Comparison with Mars and Ganymede
E. E. Milanovsky, A. M. Nikishin 		  1279

40AR-39AR Age of the L5-6 Tzarev Chondrite
D. V. Minh, M. M. Fugzan, N. I. Zaslavskaya, G. M. Kolesov, Yu. A. Shukolyukov 		  1280

Noble Gases in the Kaidun Meteorite
D. V. Minh, A. V. Ivanov, Yu. A. Shukolyukov 		  1281

Chemical Zoning and Homogenization of Pasamonte-Type Pyroxene
M. Miyamoto, M. B. Duke, D. S. McKay 		  1282

Volcanic Features on Mars in Space and Time
H. J. Moore 		  1283

The Geomorphologic Features on RHEA
J. M. Moore, V. M. Horner 		  1284

Surface-Correlated Trace Elements in 15426 Lunar Glasses
J. W. Morgan, G. A. Wandless 		  1285

Crustal Radiogenic Heat Production and the Stability of Ancient Continental Crust
So-P. Morgan, L. D. Ashwal 		  1286

New Compounds and Phase Relations, Implications for Refractory Inclusions in Meteorites
P. E. D. Morgan, E. A. Pugar 		  1287

Mineralogical and Crystallographic Studies of Lodranite and Primitive Achondrite Groups Bearing on Their Genetic Link
H. Mori, H. Takeda, M. Prinz, G. E. Harlow 		  1288

Geology of the Olympus Mons Region of Mars
E. C. Morris 		  1289

Spectral Properties of Annealed (FEXAL1-X)2O3 Gels with Applications to Mars
R. V. Morris, H. V. Lauer 		  1290

Scattering Coefficients and Optical Penetration Depths for Powders of San Carlos Olivine
R. V. Morris, W. W. Mendell 		  1291

Cumulus Versus Intercumulus: Crystallization, Migration, and Interaction in a Layered Intrusion
D. A. Morrison, D. E. MacZuga, W. C. Phinney 		  1292

Venus Analogues on the Earth's Ocean FLOOR(?): Volcanic Terrains Seen by Seamarc II Side Scan Sonar
So-P. Mouginis-Mark, P. Fryer, D. Hussong, S. Zisk 		  1293

Pu-Ree Partitioning Between Apatite and Whitlockite
M. T. Murrell, M. Brandriss, D. S. Woolum, D. S. Burnett 		  1294

Nitrogen and Argon Components in Cape York
S. V. S. Murty, K. Marti 		  1295

YAMATO-74370: a New Enstatite Chondrite (EH4)
H. Nagahara, A. El Goresy 		  1296

Reaction in the Matrix of Chondrites: Preliminary Experiments
H. Nagahara, I. Kushiro 		  1297

Gas-Rich Meteorites: Solar Flare Neon and Solar Cosmic Ray Fluxes
C. M. Nautiyal, J. T. Padia, M. N. Rao, T. R. Venkatesan 		  1298

Self-Shielding in o2 - a Possible Explanation for Oxygen Isotopic Anomalies in Meteorites?
O. Navon, G. J. Wasserburg 		  1299

Lunar Highland Pristine Rocks: Interelement Relationships
M. A. Nazarov 		  1300

Data of Iridium Geochemistry: Implication for the Early History of the Earth Crust
M. A. Nazarov, L. D. Barsukova, G. M. Kolesov, A. S. Alekseev 		  1301

Lunar Metal Particles from Luna 24 and Apollo 16 Samples: Geochemical Investigation
M. A. Nazarov, M. I. Korina, O. D. Rode, G. M. Kolesov, E. Y. Shcherbovsky 		  1302

Parsa: an Unequilibrated Enstatite Chondrite (uec) with an Aubrite-Like Impact Melt Clast
C. E. Nehru, M. Prinz, M. K. Weisberg, J. S. Delaney 		  1303

Shock-Wave Studies of Giant Planet Materials
W. J. Nellis, M. Ross, A. C. Mitchell, N. C. Holmes, H. B. Radousky 		  1304

The Cratering Record of Ganymede
G. Neukum, S. Pozio 		  1305

Molybdenum in Eucrites, New Evidence for a Metal Core in Vesta (eucrite Parent Body)
H. E. Newsom 		  1306

The Abundance of Molybdenum in Lunar Samples, New Evidence for a Lunar Metal Core
H. E. Newsom 		  1307

The Depletion of Siderophile Elements in the Earth's Mantle New Evidence from Molybdenum and Tungsten
H. E. Newsom, H. Palme 		  1308

The Absolute Isotopic Composition of TI
F. R. Niederer, D. A. Papanastassiou, G. J. Wasserburg 		  1309

Model of the Formation of the Early Sialic Crust of the Earth
A. M. Nikishin, E. E. Milanovsky 		  1310

Semi-Empirical Model for Spallogenic he and NE in Chondrites: Implications for Irradiation History of Sncs
L. E. Nyquist 		  1311

Fission of Venus?
J. A. O'Keefe 		  1312

Condensation of Impact Produced Vapor
J. D. O'Keefe, T. J. Ahrens 		  1313

Textural and Chemical Analyses of Crystalline Melt Breccia Clasts in Howardites and Polymict Eucrites
R. Ostertag 		  1314

Modal, Textural, and Chemical Characteristics of Apollo 16 Station 11 Granulites
R. Ostertag, H. Palme, R. Borchardt, D. Stoffler 		  1315

On the Origin of Lithophile Refractory Elements in Pt-Metal Nuggets from ca, Al-Rich Inclusions in Carbonaceous Chondrites
H. Palme, W. Schmitt 		  1316

The Evolution of the Lunar Magma Ocean: Evidence from Trace Elements in Plagioclase
H. Palme, B. Spettel, H. Wanke, A. Bischoff, D. Stoffler 		  1317

Composition and Size of Uranian Ring Particles
K. D. Pang, P. D. Nicholson 		  1318

Search for MG Isotopic Signatures in Allende
D. A. Papanastassiou, C. A. Brigham, G. J. Wasserburg 		  1319

Crystallization Experiments on a Range of Ca-Al Inclusion Compositions
J. M. Paque, E. Stolper 		  1320

A Model for the Emplacement and Solidification of Bright Terrain on Ganymede
E. M. Parmentier, J. W. Head 		  1321

Origin of the Variation in Properties of CV3 Meteorite Matrix and Matrix Clasts
J. A. Peck 		  1322

Galactic-Cosmic Exposure Histories of the Antarctic Shergottite EETA 79001
R. O. Pepin, R. H. Becker 		  1323

Surface Units on Venus Derived from Pioneer-Venus Altimetry, Roughness, and Reflectivity Measurements
A. R. Peterfreund, J. W. Head, J. B. Garvin, S. A. Zisk 		  1324

Cleopatra Patera, a Circular Structure in Maxwell Montes, Venus; Volcanic or Impact?
A. R. Peterfreund, J. W. Head, R. A. F. Grieve, D. B. Campbell 		  1325

Stratigraphy at Copernicus and the Source of Olivine in the Central Peak
C. M. Pieters, D. E. Wilhelms, R. Paquette 		  1326

Toward a Topographic Model of Martian Craters from Photoclinometry
R. J. Pike, P. A. Davis 		  1327

Similar Spacing of Basin Rings on Mars, Mercury and the Moon
R. J. Pike, P. D. Spudis 		  1328

Lunar Luminescence and its Possible Origin from Incoherent Scattering
A. E. Potter, W. Mendell, T. Morgan 		  1329

Sulfur Loss from Thermally Treated Leedey (L6) Samples
T. M. Primus, C. B. Moore, E. K. Gibson 		  1330

Type 3 Enstatite Chondrites: a Newly Recognized Group of Unequilibrated Enstatite Chondrites (uec's)
M. Prinz, C. E. Nehru, M. K. Weisberg, J. S. Delaney 		  1331

Nitrogen Abundances and Isotopes in Co-Existing Metal and Silicate
C. A. Prombo, R. N. Clayton 		  1332

Strontium Isotopic Composition in Rocks of the Popigai Astrobleme
A. I. Raikhlin, Yu. P. Shergina, G. A. Murina 		  1333

Spectral Reflectance Characteristics of Allende White Inclusions
S. Rajan, M. J. Gaffey 		  1334

Oxidized, Refractory and Alkali-Rich Components in Qingzhen Enstatite Chondrite: Implications about Their Origin
E. R. Rambaldi, R. S. Rajan, R. M. Housley, D. Wang 		  1335

The Varying Densities of the Terrestrial Planets
A. S. P. Rao 		  1336

Partitioning of co, cu, ga, as, and AU Between Martensite, Taenite, and Tetrataenite in the Iron Meteorite Buenaventura
K. L. Rasmussen, D. J. Malvin, H. Roy-Poulson 		  1337

An Improved Model to Constrain Global Lunar Heat Flow and Bulk-Moon th and U Contents
K. L. Rasmussen, P. H. Warren 		  1338

Morphometric Analyses of Lunar Impact Craters
M. A. Ravine, R. A. F. Grieve, R. S. Edrington, I. L. Meglis 		  1339

Processes Giving Rise to Isotopic Inhomogeneities in the Early Solar Nebula
J. Ray 		  1340

Status of Models for Lunar Nitrogen Isotopic Variations
J. Ray 		  1341

A Model for Gcr-Particle Fluxes in Stony Meteorites and Production Rates of Cosmogenic Nuclides
R. C. Reedy 		  1342

Calculated Production Rates of Noble Gases in SNC Meteorites
R. C. Reedy 		  1343

High-Energy Cosmogenic Neutrons in Extraterrestrial Matter
R. C. Reedy 		  1344

Genesis of Pseudotachylite Veins in the Basement of the Rochechouart Impact Crater, France. II. Geochemical Evidence and a Genetic Model
W. U. Reimold, L. Bischoff, W. Oskierski, A. Rehfeldt, A. Schmidt 		  1345

Genesis of Pseudotachylite Veins in the Basement of the Rochechouart Impact Crater, France. I. Geological and Petrographical Evidence
W. U. Reimold, L. Bischoff, W. Oskierski, H. Schafer 		  1346

The Rochechouart Impact Melt: Geochemical Implications and Rb-Sr Chronology
W. U. Reimold, W. Oskierski, H. Schafer 		  1347

Layered Silicates in Chondritic Porous Aggregate W7029*A: a Case of Primary Growth
J. M. F. Rietmeijer, I. D. R. MacKinnon 		  1348

Liquid Silicate Densities at High Pressures: First Shock Wave Measurements
S. M. Rigden, T. J. Ahrens, E. M. Stolper 		  1349

Chemistry of the Grain Size Fractions of Luna 24 Regolith
O. D. Rode, A. V. Ivanov, M. Chajka, E. Sabo 		  1350

Microwave Reflectivity of the Multi-Layer Models of the Martian Surface
L. E. Roth, R. S. Saunders 		  1351

Gaussian Analysis of 1 Micrometer FE2+ Absorptions of Mafic Minerals
T. L. Roush, R. B. Singer 		  1352

Relatively Coarse-Grained Chondrule Rims in Type 3 Chondrites
A. E. Rubin 		  1353

Bulk Compositions of Chondritic Matrix Materials: Pentlandite-Merrillite Assemblages in Allende Matrix
A. E. Rubin, J. N. Grossman, J. T. Wasson 		  1354

Fluid Inclusions in Stony Meteorites -- a Cautionary Note
R. L. Rudnick, L. D. Ashwal, D. J. Henry, E. K. Gibson 		  1355

Lunar Reorientations and Primeval Satellites
S. K. Runcorn 		  1356

Dynamic Crystallization Studies on Two Olivine Thoeliite Flows: Similarities and Differences
W. J. Russell, G. E. Lofgren 		  1357

Most Olivine in the Lunar Highlands is of Shallow Origin
G. Ryder 		  1358

Olivine in Lunar Dunite 72415, a Rather Shallow-Origin Cumulate
G. Ryder 		  1359

Towards Understanding Lunar Pristine Rocks: Pursuing Petrogenesis in Stillwater Norite 1
G. Ryder, B. Spettel 		  1360

The Scale of Compositional Heterogeneities in Stillwater Anorthosites An-I and An-Ii
P. A. Salpas, L. A. Haskin, I. S. McCallum 		  1361

Laboratory Infrared Spectra of Meteorites and Interplanetary Dust from 2.5 to 25 Microns
S. A. Sandford 		  1362

Thermochemically Mass-Balanced Earth and Meteorites
S. K. Saxena, G. Eriksson 		  1363

Preliminary Ion Microprobe Study of Chromium Isotopes in Orgueil
D. E. Scatena-Wachel, R. W. Hinton, A. M. Davis 		  1364

Dark Halo Craters and the Thickness of Grooved Terrain on Ganymede
P. M. Schenk, W. B. McKinnon 		  1365

Transient Crater Motions: Saturated Sand Centrifuge Experiments
R. M. Schmidt 		  1366

Experimental Determination of Silicate-Partition Coefficients of p, ga, ge, and W as Function of Oxygen Fugacity
W. Schmitt, H. Wanke 		  1367

Enhancement of Small Intensity Variations in Noisy Digital Images by Using a Least-Squares Artificial Illumination Method
E. Schonfeld 		  1368

Impact Basin Control of Volcanic and Tectonic Provinces on Mars
P. H. Schultz 		  1369

Effects of Projectile Deformation on Cratering Efficiency and Morphology
P. H. Schultz, D. E. Gault 		  1370

On the Formation of Contiguous Ramparts around Martian Impact Craters
P. H. Schultz, D. E. Gault 		  1371

Evolution of Erosional Styles of Martian Impact Basins
P. H. Schultz, J. Rogers 		  1372

Ancient Surfaces of Mars: the Basement Complex
D. H. Scott, J. S. King 		  1373

Gravity-Profile Studies of Some Martian Volcanoes and Impact Craters: Geologic Significance
D. H. Scott, T. F. McDonald 		  1374

Petrology of Metamorphosed Carbonaceous Chondrites
E. R. D. Scott, G. J. Taylor, K. Keil 		  1375

Regolith Evolution Experiments II: Modal and Chemical Analyses
T. H. See, F. Horz, M. J. Cintala 		  1376

Libyan Desert Glass: Remnants of an Impact Melt Sheet
W. R. Seebaugh, A. M. Strauss 		  1377

Analysis of Segregation Trends Observed in Iron Meteorites Using Measured Distribution Coefficients
R. Sellamuthu, J. I. Goldstein 		  1378

Distribution of Characteristic Features across the Boundary in Acidalia and Amazonis-Memnonia
A. M. Semeniuk, H. Frey 		  1379

Electrochemical Behavior of Oxygen in Silicate Melts
K. W. Semkow, L. A. Haskin 		  1380

Redox Equilibria in Diopsidic Melt
K. W. Semkow, L. A. Haskin 		  1381

Tectonic Evolution of the Moon and Terrestrial Planets
C. K. Seyfert 		  1382

Planetary Structures: an Analytical Approach
J. P. Sharma 		  1383

A Statistical Treatment of the Regional Slope Characteristics of Venus and Earth
V. L. Sharpton, J. W. Head 		  1384

Regional Slope Characteristics of Global Topography: a Comparison of Venus and Earth
V. L. Sharpton, J. W. Head 		  1385

Analysis and Interpretation of the Apollo Lunar Sounder Data: a Status Report
V. L. Sharpton, J. W. Head, R. W. Shorthill 		  1386

Reassignment of the Iron(iii) Absorption Bands in the Spectra of Mars
D. M. Sherman 		  1387

Consortium Breccia 14321: Petrology of Mare Basalts and Olivine Vitrophyres
J. W. Shervais, L. A. Taylor 		  1388

Very High Potassium (vhk) Basalt: a New Type of Aluminous Mare Basalt from Apollo 14
J. W. Shervais, L. A. Taylor, J. C. Laul 		  1389

Petrology and Geochemistry of Pristine Highland Clasts in Consortium Breccia 14305
J. W. Shervais, L. A. Taylor, J. C. Laul, M. R. Smith 		  1390

Optical Properties of Reiner Gamma Magnetic Anomaly on the Moon
V. V. Shevchenko 		  1391

Rb-Sr Chronology and Petrogenesis of VHK Basalts
C.-Y. Shih, B. M. Bansal, H. Wiesmann, L. E. Nyquist 		  1392

Uranium Isotopic Abundance in Allende Residue
T. Shimamura, G. W. Lugmair 		  1393

Upheaval Dome Impact Structure, Utah
E. M. Shoemaker, K. E. Herkenhoff 		  1394

Evolution of the Uranus-Neptune Planetesimal Swarm
E. M. Shoemaker, R. F. Wolfe 		  1395

Isotopic Anomaly of xe in the C3V Efremovka Chondrite
Yu. A. Shukolyukov, A. K. Lavrukhina, D. V. Minh, A. V. Fisenco, L. F. Semenova 		  1396

I-Xe Dating of Some L-Chondrites
Yu. A. Shukolyukov, D. V. Minh, G. M. Kolesov, M. M. Fugzan 		  1397

Apollo 14 Regolith Breccias 14318 and 14301: Comparative Petrology and Chemistry of Grain Size Separates
S. B. Simon, J. C. Laul, J. J. Papike 		  1398

Petrology and Chemistry of Apollo 12 Drive Tube 12027
S. B. Simon, J. C. Laul, J. J. Papike, M. R. Smith 		  1399

Petrology of Apollo 11 Regolith Breccias
S. B. Simon, J. J. Papike 		  1400

Highland Clasts in Apollo 11 Regolith Breccias
S. B. Simon, J. J. Papike, C. K. Shearer 		  1401

Multispectral Analysis of the Kasei Vallis - Lunae Planum Region of Mars
R. B. Singer, E. Cloutis, T. L. Roush, P. J. Mouginis-Mark, B. R. Hawke, P. R. Christensen 		  1402

Quenched Magnetite in Cretaceous-Tertiary Boundary Microtektite-Like Spheroids
J. Smit, F. T. Kyte, J. T. Wasson 		  1403

A Strategy for Interpretation of Multispectral Reflectance from Planetary Surfaces: Methodology
M. O. Smith, P. E. Johnson, J. B. Adams 		  1404

Three-Dimensional Dynamical Limits of the Oort Cloud
R. Smoluchowski, M. Torbett 		  1405

Spectral Similarities of Impact Melts from Large Lunar Highland Craters
S. Smrekar, C. M. Pieters 		  1406

Implications of New Structural Models for Lunar Basins: Age-Dependence of Basin-Modification Processes
S. C. Solomon, S. R. Bratt, J. W. Head 		  1407

Rift Structures on Venus: Implications of a Lithospheric Stretching Model
S. C. Solomon, J. W. Head 		  1408

Significance of Apollo 16 Impact Melts to the Geology of the Lunar Terrae
P. D. Spudis 		  1409

The Early Moon: Implications of a Large Impact Into a Hot Target
P. D. Spudis, M. J. Cintala, R. A. F. Grieve 		  1410

Geochemical Mixing Model Studies of Ejecta from Lunar Farside Basins: Implications for Crustal Models
P. D. Spudis, B. R. Hawke, T. Jackowski 		  1411

New Identification of Ancient Multi-Ring Basins on Mercury and Implications for Geologic Evolution
P. D. Spudis, M. E. Strobell 		  1412

Numerical Simulation of Volcano-Ground Ice Interaction on Mars
S. W. Squyres, A. C. Moosman 		  1413

Martian Impact Basins: Morphology Differences and Tectonic Provinces
M. Stam, P. H. Schultz, G. E. McGill 		  1414

Belgica 7904, an Extreme c2 from Antarctica: Petrology and Mineral Chemistry
I. M. Steele, R. T. Cox, J. V. Smith 		  1415

On Forming the Giant Planets Quickly Super-Ganymedean Puffballs)
D. J. Stevenson 		  1416

Classification of Circular Features on Venus
E. R. Stofan, J. W. Head, R. A. F. Grieve 		  1417

The Lunar Crust in the Descartes Area Near North Ray, Apollo 16. II. Chronology and Selenological Interpretations
D. Stoffler, A. Bischoff, R. Borchardt, A. Deutsch, E. K. Jessberger, R. Ostertag, H. Palme, W. U. Reimold, K. Wacker, H. Wanke 		  1418

The Lunar Crust in the Descartes Area Near North Ray, Apollo 16. I. Petrographic and Chemical Properties
D. Stoffler, A. Bischoff, R. Borchardt, A. Deutsch, E. K. Jessberger, R. Ostertag, H. Palme, W. U. Reimold, K. Wacker, H. Wanke 		  1419

Three Component Mixing in Aubrite REE Abundances
M. M. Strait 		  1420

Magnetic Properties of the Lunar Sample 67559,15 and Chemical Demagnetization
N. Sugiura, D. W. Strangway 		  1421

NRM Directions around a Cm-Size Inclusion in Allende
N. Sugiura, D. W. Strangway 		  1422

Geology of the Venus Lowlands: Guinevere and Sedna Planitia
K. Sullivan, J. W. Head 		  1423

Noble Gas Component Organization in 14318
T. D. Swindle, M. W. Caffee, C. M. Hohenberg, B. Hudson 		  1424

Diogenites-Eucrites Link as Inferred from Some New Meteorites and Lithic Clasts from Antarctica
H. Takeda, H. Mori 		  1425

Mesostasis-Rich Lunar and Eucritic Basalts with Reference to Ree-Rich Minerals
H. Takeda, H. Mori, M. Miyamoto, T. Ishii 		  1426

Probable Lack of Very Ancient Terrain on Mars Revealed by Crater-Population Comparisons with the Moon
K. L. Tanaka 		  1427

Mercury: Discrepancies among Crater Distributions
K. L. Tanaka, M. E. Strobell 		  1428

Primative Nature of Ordinary Chondrite Matrix Materials
G. J. Taylor, E. R. D. Scott, K. Keil, W. V. Boynton, D. H. Hill, T. K. Mayeda, R. N. Clayton 		  1429

Volatile/refractory Element Fractionation and the Lunar Fission Hypothesis
S. R. Taylor 		  1430

Continental Crustal Bulk Composition: the Andesite Model Revisited
S. R. Taylor, S. M. McLennan 		  1431

Simulation of the Interaction of Galactic Cosmic Radiation with Matter: Longlived Cosmogenic Nuclides Produced in Different Irradiation Experiments
S. Theis, So-P. Englert, R. Michel, R. C. Reedy, J. R. Arnold 		  1432

Cosmic Dust from Antarctica: on the Nature of Glassy and Metallic Microspheres
K. Thiel, R. J. Peters 		  1433

A Hydrated Interplanetary Dust Particle: Characterization by Transmission Electron Microscopy
K. Tomeoka, P. R. Buseck 		  1434

Basaltic Volcanism on the Eucrite Parent Body: Geochemistry and Mineral Chemistry of ALHA80102
A. H. Treiman, M. J. Drake 		  1435

Basaltic Volcanism on the Eucrite Parent Body: Petrology and Phase Equilibria of ALHA80102, and the Discovery of Ferroan Troctolite
A. H. Treiman, M. J. Drake 		  1436

The Snc/mars Connection: Geochemical Inconsistencies
A. H. Treiman, J. H. Jones, M. J. Drake 		  1437

Experiments on Intact Capture of Hypervelocity Particles
So-P. Tsou, D. Brownlee, A. Albee 		  1438

Metal Grains in Chondrules: an Experimental Study
A. Tsuchiyama, M. Miyamoto 		  1439

Was the Early Earth Completely Molten?
D. L. Turcotte, J. C. Pflugrath 		  1440

On the Origin of Fine-Grained ca, Al-Rich Inclusions in the Efremovka Carbonaceous Chondrite
A. A. Ulyanov 		  1441

REE in Cai's of the Efremovka Chondrite
A. A. Ulyanov, G. M. Kolesov 		  1442

Lu-Hf Evolution of KREEP
D. M. Unruh, M. Tatsumoto 		  1443

The Earth-Crossing Asteroid 1983 TB
G. J. Veeder, C. Kowal, D. L. Matson 		  1444

Size-Velocity Distribution of Large Ejecta Fragments
A. M. Vickery 		  1445

Xenolith Digestion in Large Magma Bodies
D. Walker, W. Kiefer 		  1446

Chemistry and Accretion of Earth and Mars
H. Wanke, G. Dreibus 		  1447

Tectonic Environments of Martian Flood Lavas
A. W. Ward, P. D. Spudis 		  1448

The Relationship Between Size and Composition of Allende Cai's
D. A. Wark, W. V. Boynton 		  1449

The Problem of the Origin of 16O Anomalies in Carbonaceous Chondrites
D. A. Wark, R. D. Brown 		  1450

Primordial Degassing, Lithosphere Thickness, and Genesis of Komatiites
P. H. Warren 		  1451

Pristine Rocks (8TH Foray): Genetic Distinctions Using Eu/al and Sr/al Ratios
P. H. Warren, G. W. Kallemeyn, J. T. Wasson 		  1452

Formation of Meteoritic Chondrules by Lightning
J. T. Wasson, K. L. Rasmussen 		  1453

Gravity Induced Compressive Stress in the Tharsis Region of Mars
T. R. Watters 		  1454

Evolution of Grains in a Turbulent Solar Nebula: a Reappraisal
S. J. Weidenschilling 		  1455

Effects of Resonances on Orbital Evolution in a Resisting Medium
S. J. Weidenschilling, D. R. Davis 		  1456

Cometary Shells around Main Sequence Stars
P. R. Weissman 		  1457

Density and Porosity Calculations for Apollo 15 and 16 Regolith Breccias
S. J. Wentworth, D. S. McKay 		  1458

A Preliminary Examination of Manned Lunar Base Sites from a Geological Viewpoint
J. L. Whitford-Stark 		  1459

Solar Flare Implanted NE in Lunar Soil Minerals; Confirmation by On-Line Etching Experiments
R. Wieler, H. Baur, P. Signer 		  1460

On the Reorientation of Mars by the Tharsis Rise
R. J. Willemann, C. Dawson 		  1461

Oscillator Models for Planetary Rings
E. Willerding 		  1462

Geomorphic Classification of Icelandic and Martian Volcanoes
R. S. Williams, E. C. Morris 		  1463

Sediment Gravity Flows on Venus
S. H. Williams, J. M. Moore 		  1464

Pixel-Scale Feature Detection in Spacecraft Images: Application to Viking Orbiter Frames
L. Wilson, D. N. Ashcroft, J. B. Garvin 		  1465

Characteristics of Basaltic Lava Flows on Venus
L. Wilson, J. B. Garvin, J. W. Head 		  1466

Aspects of Water Eruption on Icy Satellites
L. Wilson, J. W. Head 		  1467

Martian Sinuous Rilles
L. Wilson, P. ? Mouginis-Mark 		  1468

Viking Orbiter Imaging Mosaic Status Report and Presentation
S. Winterhalter 		  1469

Why Martian Lava Flows are so Long
C. A. Wood 		  1470

Comets: a Synthesis of Physical, Chemical, and Orbital Data
C. A. Wood, C. L. Moore 		  1471

Formation of Chondrules by Drag Heating in Dust-Enriched Environments
J. A. Wood 		  1472

Trace Element PIXE Studies of Qinzhen (EH3) Metal and Sulfides
D. S. Woolum, R. B. Cochrane, D. Joyce, A. El Goresy, T. M. Benjamin, P. S. Z. Rogers, C. M. Maggiore, C. J. Duffy 		  1473

Effects of Image Quality on Crater Population Statistics
A. Woronow 		  1474

Factors Affecting Saturation Density in Computer Simulations
A. Woronow 		  1475

Model for Calculating Viscosities in Magmas for the Temperature Range 400 TO 800 Degrees C
J. M. Wu, L. C. Klein 		  1476

Planetary Elevation Reference Systems: Gravity or Tri-Axiality
S. S. C. Wu 		  1477

The Vaporization Pecularities of CAL Inclusions in Chondrites: Experimental Data
O. I. Yakovlev, O. M. Markova, G. A. Semenov, A. N. Belov 		  1478

Size Dependence of (co/fe), (ir/fe), and (au/fe) Values in Deep Sea Iron Spherules
K. Yamakoshi 		  1479

Interstellar Organic Matter in Murchison Meteorite
J. Yang, S. Epstein 		  1480

Petrochemical Types, Average Compositions and Geochemical System of Lunar Magmatic Rocks
A. A. Yaroshevsky 		  1481

Quantitative Effects of Sun Angle Variations on Crater Diameter Measurements and Lunar Mare Age Determinations
R. A. Young 		  1482

Spherules from the Cretaceous-Tertiary Boundary Clay
M. Zbik, B. Lang 		  1483

Lava Properties for a Ridged and Channelized Flow on Ascraeus Mons, Mars
J. R. Zimbelman 		  1484

Planetary Impact Probabilities for Long Period Comets
J. R. Zimbelman 		  1485

Ion Probe Measurements of Hydrogen and Carbon Isotopes in Interplanetary Dust
E. Zinner, K. D. McKeegan 		  1486

Towards a Complete Inventory of Stratospheric Dust Particles, with Implications for Their Classification
M. Zolensky, I. D. R. MacKinnon, D. S. McKay 		  1487

Lunar Primary and Secondary Microcraters and the Micrometeoroid Flux
H. A. Zook, G. Lange, E. Grun, H. Fechtig 		  1488

Limits on Lithosphere Extension and Mechanisms of Rifting on Ganymede
M. T. Zuber, E. M. Parmentier, S. Joffe 		  1489