Eleventh Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

Allan Hills A77219, the First Antarctic Mesosiderite
W. N. Agosto, R. H. Hewins, R. S. Clarke 		  1001

The Effects of Magma Migration on the Evolution of the Moon
J. L. Ahern, D. L. Turcotte 		  1002

Dynamic Properties of Mare Basalts: Relation of Equations of State to Petrology
T. J. Ahrens, J. P. Watt 		  1003

Geology of the Northern Cratered Terrain of Mars: Results of the Viking Survey Mission
A. L. Albee, N. Evans, R. S. Saunders, C. W. Snyder 		  1004

Partially Weathered Basaltic Glass - a Martian Soil Analog
C. C. Allen, J. L. Gooding, K. Keil 		  1005

Microscale Accretionary Particles and Impact Pits on Luna 24 Core Spherules: SEM Observations Extended
R. J. Allison, J. A. M. McDonnell 		  1006

A Standard Depth Scale for Apollo 17 Drill Core
J. H. Allton, S. R. Waltz 		  1007

Geophysical Characteristics of Meteoritic Crater Elgygytgyn, USSR
A. V. Alyunin, A. I. Dabizha 		  1008

High-Resolution X-Ray Data from the Lunar Nearside/farside Chemical Transition Zone
C. G. Andre, I. Adler 		  1009

Hunting for Meteorites in Antarctica
J. O. Annexstad 		  1010

Intrinsic Oxygen Fugacities of the Earth's Mantle: a New Approach and Results for Spinel Peridotites
R. J. Arculus, J. W. Delano 		  1011

The Viscous Flow Behavior of Diaplectic Glass and Fusion-Formed Glass: a Comparative Study on Shocked Anorthosite from Manicouagan Crater, Canada
J. Arndt, I. Gonzalez-Cabeza 		  1012

Excitation of 12-C 16-O by Hydrogen Lyman Alpha Radiation: Potential Cause of Selective 16-O Fractionation in Protostellar Clouds
G. Arrhenius, M. J. Corrigan, R. W. Fitzgerald 		  1013

Resurfacing History of Mars - Crater Flux Models and Thermal History Models
R. E. Arvidson 		  1014

Isotopic and Chemical Problems in Genetic Interpretations of Precambrian Anorthosites
L. D. Ashwal, D. A. Morrison, W. C. Phinney, J. L. Wooden, C.-Y. Shih 		  1015

Theoretical Estimates of Minimum Shock Metamorphic Level for Lunar Crater Primary Ejecta as a Function of Ejecta Range and Impact Angle
M. G. Austin, R. B. Hawke 		  1016

Calculational Investigation of Impact Cratering Dynamics: Material Motions during the Crater Growth Period
M. G. Austin, J. M. Thomsen, S. F. Ruhl, D. L. Orphal, P. H. Schultz 		  1017

Siderophile Element Fractionation in the Metal Phase of the Bruderheim Chondrite
P. A. Baedecker 		  1018

Spinel Cataclasites in 15445 and 72435: Petrology, Mineral Chemistry, and Criteria for Equilibrium
M. B. Baker, C. T. Herzberg 		  1019

On the Rate of Ancient Meteoroidal Flux: Studies of Pre-Mare Crater Population on the Moon.
A. T. Basilevsky, L. B. Ronca, B. A. Ivanov 		  1020

Mineralogical Maturation of Terrestrial and Lunar Sediments: Preliminary Report of a Comparative Study
A. Basu, D. S. McKay 		  1021

Lunar Core 15010
A. Basu, D. S. McKay, G. Nace 		  1022

The Petrography of Basaltic Fragments in Apollo 11 Drive Tubes 10004 and 10005
D. W. Beaty, A. L. Albee 		  1023

The Petrology of a Pyroxenite Xenolith in Mare Basalt 10050
D. W. Beaty, A. L. Albee 		  1024

Parentless Lunar Radionuclear Components: Acquisition and Siting in 14301
T. J. Bernatowicz, C. M. Hohenberg, G. B. Hudson, B. M. Kennedy, F. A. Podosek 		  1025

Planetary Cratering: Rates of Modification of Lunar Crater Morphologies
R. Bianchi, M. Fulchignoni, S. Evangelista 		  1026

On the Composition of the Mare Basalt Magma Source Region
A. B. Binder 		  1027

The First Few 100 Years of Evolution of a Moon of Fission Origin
A. B. Binder 		  1028

Trace Element Studies in Enstatite Meteorites: a Study in Planetary Evolution
S. Biswas, T. M. Walsh, G. Bart, M. E. Lipschutz 		  1029

Remnants from the Ancient Lunar Crust II: Norite 15455
D. P. Blanchard, G. McKay 		  1030

Track Production Below Reworking Zones
G. E. Blanford 		  1031

Particle Tracks in Lunar Core 15010
G. E. Blanford, J. Blanford, J. A. Hawkins 		  1032

Cosmic Ray Exposure Ages and Shielding Conditions of Recently Fallen Chondrites
D. D. Bogard, W. C. Hirsch, J. C. Evans 		  1033

Depositional and Irradiational History of 15010-15011 Core Soils: Noble Gases and FMR
D. D. Bogard, R. V. Morris, W. C. Hirsch, H. V. Lauer 		  1034

Release of Water from Hydrous Minerals due to Impact
M. B. Boslough, R. J. Weldon, T. J. Ahrens 		  1035

A New Method for Calculating the Magnitudes of Atmosphereless Bodies
E. Bowell, K. Lumme 		  1036

Identification of an Ultra-Refractory Component in the Murchison Meteorite
W. V. Boynton, R. M. Frazier, J. D. MacDougall 		  1037

Meteorites as Magnetic Probes: Recent Results
A. Brecher 		  1038

Unmelted Cosmic Material in Deep Sea Sediments
D. E. Brownlee, B. A. Bates, L. B. Pilachowski, E. Olszewski, W. A. Siegmund 		  1039

Calculations of Impact Crater Size Versus Meteorite Velocity
J. B. Bryan, D. E. Burton, L. A. Lettis, L. K. Morris, W. E. Johnson 		  1040

A Lunar Compositional Model Based on Geophysical and Petrologic Constraints
W. R. Buck, M. N. Toksoz 		  1041

Solar-Flare Track Studies of the Elm Creek and Dimmit Chondrites
R. K. Bull, S. A. Durrani 		  1042

Regolith Origin for Allende Meteorite
T. E. Bunch, S. Chang, U. Ott 		  1043

Numerical Experiments with Giant Gaseous Protoplanets Embedded in the Primitive Solar Nebula
A. G. W. Cameron, W. M. Decampli, P. H. Bodenheimer 		  1044

78236, a Primary, but Partially Senile, Lunar Norite
R. W. Carlson, G. W. Lugmair 		  1045

Results of the 1979-80 U.S. Antarctic Meteorite Expedition
W. A. Cassidy, J. O. Annexstad, L. A. Rancitelli, L. Benda 		  1046

Finite Element Model of the Thermal Evolution of the Moon
S. Chacko, J.-Cl. Debremaecker 		  1047

The Isotopic Composition of U in Meteorites and Lunar Samples
J. H. Chen, G. J. Wasserburg 		  1048

Meteoroid Impact Into Short-Period Comet Nuclei-I the Process
M. J. Cintala 		  1049

Meteoroid Impact Into Short-Period Comet Nuclei-II the Results
M. J. Cintala 		  1050

Impact Heating of H2O Ice Targets: Applications to Outer Planet Satellites
M. J. Cintala, J. W. Head, E. M. Parmentier 		  1051

Martian Fresh Crater Depths: More Evidence for Substrate Volatiles?
M. J. Cintala, P. J. Mouginis-Mark 		  1052

Volatile Transfer during Lunar Metamorphism: (i) Basalt - Apatite System
E. H. Cirlin, R. M. Housley 		  1053

Micrometeorite and Aluminum Oxide Spherule Hypervelocity Impacts on SKYLAB IV Windows
U. S. Clanton, H. A. Zook, R. A. Schultz 		  1054

Aqueous Transport of Salts on Mars
B. C. Clark 		  1055

Theoretical X-Ray Fluorescence Intensities in Planetologically Significant Materials
P. E. Clark 		  1056

New Compositional Information on Europa, Ganymede, Callisto and Saturn's Rings
R. N. Clark 		  1057

The Surface Condensates on Mars Observed by Viking: Frost Layers Several Tenths of a Millimeter Thick
R. N. Clark 		  1058

Internal Chemical Energy: Origin of Chondrules
D. D. Clayton 		  1059

Mars: Polar CAP Basal Melting as a Recharge Mechanism for a Global Groundwater System
S. M. Clifford 		  1060

Magnetization History of Lunar Samples - can it BE Explained by Conventional Processes?
D. W. Collinson 		  1061

Thickness of the Martian Lithosphere Beneath Volcanic Loads: a Consideration of Time Dependent Effects
R. P. Comer, S. C. Solomon, J. W. Head 		  1062

I-Xe Ages of Carbonaceous Chondrites
J. Crabb, R. S. Lewis, E. Anders 		  1063

Nucleation Barrier in Anorthite
D. Cranmer, R. Salomaa, H. Yinnon, D. R. Uhlmann 		  1064

Cratering Flow Fields: Implications for Excavation Cavities, Transient Cavities, and Depth of Excavation
S. K. Croft 		  1065

Systematics of Basin Ring Structure
S. K. Croft 		  1066

Nuclear Particle Tracks in Apollo 14, 15 and 17 Lunar Cores
G. Crozaz 		  1067

The Mass Deficiency of Meteoritic Craters
A. I. Dabizha 		  1068

Geophysical Investigations of Zhamanshin Crater, USSR
A. I. Dabizha, P. V. Florensky, O. I. Alyunina, A. V. Alyunin 		  1069

Aspects of S Systematics in Non-Mare Lunar Basalts
P. A. Danckwerth, P. C. Hess, M. J. Rutherford 		  1070

Experimental Study of Shock Melted Metallic Particles
G. H. Deamer, J. I. Goldstein 		  1071

Variations in Crater Morphology: 15-20 KM Diameter
R. A. Dehon 		  1072

Pyroxene Overgrowth Textures: Evidence for Rapid Cooling from High Temperatures in Mesosiderites
J. S. Delaney, R. L. Bedell, G. E. Harlow, C. E. Nehru, R. Klimentidis, M. Prinz 		  1073

Olivine Clasts in Mesosiderites and Howardites: Clues to the Nature of an Achondrite Parent Body
J. S. Delaney, R. Bedell, R. Klimentidis, C. E. Nehru, M. Prinz 		  1074

Apollo 15 Red Glass: Chemistry and Liquidus Phase Relations
J. W. Delano 		  1075

Apollo 15 Yellow Glasses: Chemistry and Possible Origins
J. W. Delano 		  1076

Constraints on the Chemical Nature of Magmas Parental to Pristine Highland Cumulates
J. W. Delano 		  1077

Nakhla: Oxidation State and Other Constraints
J. W. Delano, R. J. Arculus 		  1078

Apollo 16 Green Glass
J. W. Delano, R. Rudowski 		  1079

Composition and Structure of the Deep Lunar Interior
J. W.. Delano, S. R. Taylor, A. E. Ringwood 		  1080

Six Lunar Rocks have Little Carbon and Nitrogen and Some Rocks have Detectable Spallogenic 13-C
D. J. Desmarais 		  1081

X-Ray Spectroscopy of Fine Fraction of Regolith from the Samples Recovered by Automatic Lunar Mission "LUNA-24"
Yu. P. Dikov, O. A. Bogatikov, I. A. Brytov, Yu. N. Romashchenko, K. I. Konashenok, A. Cimbalnikova 		  1082

Anomalous Afternoon Cooling on Mars: a Preliminary Survey of the Viking IRTM Diurnal Data
R. Ditteon, H. H. Kieffer 		  1083

Reflectance Spectrophotometry of Samples Extended to UV
A. Dollfus, A. Cailleux, B. Cervelle, C. T. Hua, J.-C. Mandeville 		  1084

Formation, Composition and Structure of Interstellar Grains: Theory and Experiment
B. Donn 		  1085

Iron-Nickel Blebs in Olivine Single Crystals are Produced by Reduction in the Solid State
A. Duba, J. N. Boland 		  1086

Reconciling Venusian Topography and the AR-40 Anomaly
D. Dunham, H. A. Spetzler 		  1087

Thickness of Lunar Farside Basin Ejecta
M. C. Duplechin, R. A. Dehon 		  1088

Stellar Origin of Dme [SUB] L - XE
M. Dziczkaniec, D. Heymann 		  1089

Stellar Origin of Pu-Xe a Model
M. Dziczkaniec, D. Heymann 		  1090

Desert Varnish on Sand Grains from the Western Desert of Egypt: Importance of the Clay Component and Implications to Mars
F. El-Baz, D. Prestel 		  1091

Osmium Depletion in Fremdlinge in an Allende Inclusion: Possible Supernova Material?
A. Elgoresy, P. Ramdohr 		  1092

The [DELTA] 18-O and [DELTA] 17-O Values in Reactions Involoving Excited Oxygen Molecules by Measuring CO2 Mass Spectrometrically
S. Epstein 		  1093

The Initial State of 26-AL and 26-MG/24-MG in the Early Solar System
T. M. Esat, D. A. Papanastassiou, G. J. Wasserburg 		  1094

Light Noble Gases in Three Plagioclase Grain Size Suites
Ph. Etique, H. Funk, P. Horn, P. Signer 		  1095

Noble Gases Trapped 3.7 AE ago in Orange and Black Glasses from Drive Tubes 74001/2
O. Eugster, N. Grogler, P. Eberhardt, J. Geiss 		  1096

Amorphous Gels as Possible Analogs to Martian Weathering Products
D. L. Evans, J. B. Adams, D. B. Wenner 		  1097

On the Behaviour of Disseminated Iron Droplets during Regolith Maturation
A. E. Fallick, C. T. Pillinger, A. Stephenson 		  1098

Effects of Overlapping Optical Absorption Bands of Pyroxene and Glass on the Reflectance Spectra of Lunar Soils
T. G. Farr, B. Bates, R. L. Ralph, J. B. Adams 		  1099

Condensation of Barium, Strontium, and Zirconium in the Primitive Solar Nebula
B. Fegley 		  1100

The Infrared Reflectance Spectra of Eucrites, Shergottites, and Vesta
M. A. Feierberg, M. J. Drake 		  1101

Possible Rhyolite Flows in the Arcadia Planitia Region of Mars: Evidence from Surface Ridge Geometry
J. H. Fink 		  1102

CARBON-14 Dating of Antarctic Meteorites and Antarctic Ice
E. L. Fireman 		  1103

Granulometric Analysis of Metallic Phase of the Ordinary Chondrites
A. V. Fisenko, A. K. Lavrukhina, G. G. Ruchman 		  1104

Stratospheric "brownlee" Particles: Diverse Leftovers from the Collapse
P. Fraundorf 		  1105

Stratospheric "brownlee" Particles: the Question of Solar Flare Tracks
P. Fraundorf, G. J. Flynn, J. Shirck, R. M. Walker 		  1106

Demonstration of the Presence of the "cosmic" 10 UM Feature in the Optical Absorption Spectrum of "brownlee" Particles
P. Fraundorf, J. J. Freeman, R. I. Patel, J. Shirck, R. M. Walker 		  1107

Combustion of an Allende Residue: a Closed-System Study of Rare Gases Released by Oxidation
U. Frick, R. O. Pepin 		  1108

Depositional History of the Apollo Drive Tube 76001 during the Past Few Million Years
J. S. Fruchter, J. C. Evans, J. H. Reeves, R. W. Perkins 		  1109

Refractory Metal Particles in Refractory Inclusions in the Allende Meteorite
L. H. Fuchs, M. Blander 		  1110

Mineralogically Diagnostic Features in the Visible and Near-Infrared Reflectance Spectra of Carbonaceous Chondrite Assemblages
M. J. Gaffey 		  1111

Lunar Highland Breccias: Representative Samples of the Primitive Lunar Crust?
J. R. Garrison, L. A. Taylor 		  1112

Rock Morphology and Size Distributions at the Viking Landing Sites and Comparisons with Venus
J. B. Garvin, D. Grinspoon, J. W. Head, P. Helfenstein, P. Lucey, P. J. Mouginis-Mark, E. A. Robinson 		  1113

Impact Degassing of the Earth
M. V. Gerasimov, L. M. Mukhin 		  1114

Carbon Abundances in Antarctic Meteorites
E. K. Gibson 		  1115

Additional Planet Crossing Asteroids
J. Gibson, J. G. Williams 		  1116

Ridge Systems of Caloris: Comparison with Lunar Basins
A. W. Gifford, T. A. Maxwell 		  1117

Martian Channel Erosion: the Lahar Analogy
H. Glicken, P. H. Schultz 		  1118

Density of the Mantle of Mars
K. A. Goettel 		  1119

Seismic Energy Release of the Moon
N. R. Goins, A. M. Dainty, M. N. Toksoz 		  1120

Origin of Lunar Grabens and Constraints on the Total Expansion of the Moon
P. Golombek, G. E. McGill 		  1121

Geochemical Fractionations during the Evolution of Martian Soils
J. L. Gooding 		  1122

The Origin of Chondrules as Secondary Objects: Evidence from Chemical - Petrological Heterogeneities
J. L. Gooding, K. Keil, T. Fukuoka, R. A. Schmitt 		  1123

Immiscibility in Ore-Silicate Melts as a Factor in the Early Differentiation of Meteorites and Planets
N. S. Gorbachev, Eu. G. Osadchii, G. V. Baryshnikova 		  1124

Early Irradiation History Based on Studies of Carbonaceous Chondrites, Gas-Rich Meteorites and Terrestrial Neon
J. N. Goswami, D. Lal, M. N. Rao 		  1125

Irradiation Features in Different Inclusion Types in CM Chondrites
J. N. Goswami, J. D. MacDougall 		  1126

The Effects of Photometric Geometry on Spectral Reflectance
J. C. Gradie, J. Veverka, B. J. Buratti 		  1127

Venus: Consideration of Aeolian (windblown) Processes
R. Greeley, J. Iversen, R. Leach, J. Pollack 		  1128

Mare Basin Filling: Laboratory Simulations
R. Greeley, M. Womer 		  1129

Numerical Simulation of Planet Growth: Early Runaway Growth
R. Greenberg 		  1130

Siderophile-Rich Fe-Ni Particles in the Melt Rocks of E. Clearwater: Their Characteristics and Possible Origin
R. A. F. Grieve, H. Palme, A. G. Plant 		  1131

Origin of Textural Diversity in Apollo 11 High-K Basalts
T. L. Grove, D. W. Beaty 		  1132

Experimental Investigation of a Mg-Rich Olivine Vitrophyre from Apollo 14 Breccia 14321
J. E. Grover, D. H. Lindsley, A. E. Bence 		  1133

Spectral Properties of Soils at the Viking 1 Lander Site
E. A. Guinness 		  1134

The Dependence of the Lunar Center-Of Displacement on Crustal Thickness and Density
E. L. Haines, A. E. Metzger 		  1135

Central Peaks in Mercurian Craters: Comparisons to the Moon
W. Hale, J. W. Head 		  1136

Lunar Floor-Fractured Craters: the Relative Importance of Isostatic Relaxation and Uplift by Volcanic Intrusion
J. L. Hall, S. C. Solomon, J. W. Head 		  1137

Orientation of Central Peaks in Craters on Mars
A. H. Hamdan, F. El-Baz 		  1138

Minor Elements in Lunar Olivine: Electron Probe Analyses of na, al, p, ca, ti, cr, MN and NI
E. C. Hansen, J. V. Smith, I. M. Steele 		  1139

A Color-Ratio Map of Mercury
B. Hapke, C. Christman, B. Rava, J. Mosher 		  1140

Low Orthopyroxene: Achondritic Abundance and Planetary Significance
G. E. Harlow 		  1141

Clouding of Pyroxenes and Plagioclases in Eucrites: Implications for Post-Crystallization Processing
G. E. Harlow, R. Klimentidis 		  1142

A Triaxial Figure of Juno Inferred from Occultation and Lightcurve Data
A. W. Harris 		  1143

Continued Low-Velocity Impact Experiments at AMES Vertical Gun Facility: Miscellaneous Results
W. K. Hartmann 		  1144

Obeq, an Alternate Model for Modifying Magma Compositions
L. A. Haskin, J. C. Brannon 		  1145

A Trace Element Study of Tektites and Materials from Their Possible Parent Craters
L. A. Haskin, J. Gonzales-Garcia, B. Kleinmann, M. A. Haskin, M. Braverman, H. Roca 		  1146

Highlands Olivine Norite, a Major Constituent of Lunar Highlands Soils
L. A. Haskin, R. L. Korotev, M. M. Lindstrom 		  1147

Small Dark-Mantle Deposits of Possible Pyroclastic Origin: Geologic Setting, Composition, and Relation to Regional Stratigraphy
B. R. Hawke, J. W. Head 		  1148

Sulpicius Gallus Pryoclastic Deposits, Southwestern Serenitatis Region of the Moon: Preliminary Studies
J. W. Head, J. B. Adams, B. R. Hawke, T. B. McCord, C. Pieters, S. Zisk 		  1149

Lunar Basin Structure: Possible Influence of Variations in Lithospheric Thickness
J. W. Head, S. C. Solomon 		  1150

Oceanus Procellarum Region: Evidence for an Anomalously Thin Early Lunar Lithosphere
J. W. Head, S. C. Solomon, J. L. Whitford-Stark 		  1151

The Formation of Eroded Depressions around the Sources of Lunar Sinuous Rilles: Observations
J. W. Head, L. Wilson 		  1152

Morphology and Distribution of Fractured Terrain on Mars
P. Helfenstein, P. J. Mouginis-Mark 		  1153

Time-Dependent Lunar Density Models
F. Herbert 		  1154

39Ar-40Ar Systematics of Allende Inclusions: a Laser-Microprobe Investigation
G. F. Herzog, A. E. Bence, J. F. Bender, G. Eichhorn, H. Maluski, O. A. Schaeffer 		  1155

Solubility of Zircon, Whitlockite and Apatite in Lunar Basalts and Granites
P. C. Hess, J. Dickinson, M. J. Rutherford 		  1156

Subdivision of Diogenites Into Chemical Classes
R. H. Hewins 		  1157

Isotopic Xenon Profiles of a Massive Star
D. Heymann 		  1158

Petrology of Two Luna 24 Samples: 24067,3200 and 24067,3600
S. M. R. Hill, D. W. Beaty, A. L. Albee 		  1159

Distribution of Central Pit Craters on Mars
C. A. Hodges, N. B. Shew, G. Clow 		  1160

The Influence of Polar Cold Traps on Lunar Exospheric ARGON-40
R. R. Hodges 		  1161

The Equivalent Depth of Burial for Impact Cratering
K. A. Holsapple 		  1162

Deflection of the Solar Wind by Lunar Magnetic Anomalies: Possible Implications for Surface Optical Properties
L. L. Hood, G. Schubert 		  1163

Deep Magnetic Sounding of the Moon in the Solar Wind: Accounting for Plasma Diamagnetism
L. L. Hood, C. P. Sonett 		  1164

Higher-Resolution Mapping of Lunar Nearside Magnetic Anomalies
L. L. Hood, D. E. Wilhelms, P. J. Coleman 		  1165

The Rochechouart Crater in France: Stony and not an Iron Meteorite?
W. Horn, A. Elgoresy 		  1166

Structure of the Lunar Interior Based on Seismograms Corrected for Instrumental and Near-Surface Effects
P. Horvath, G. V. Latham, Y. Nakamura, H. J. Dorman 		  1167

Grain Size Distribution of Clasts >1 CM in the Ries Crater's Continuous Deposits
F. Horz, R. Ostertag, D. A. Rainey 		  1168

Target Stratigraphy and its Manifestation in Continuous Crater Deposits: the "bunte Breccia" of the Ries Crater, Germany
F. Horz, R. Ostertag, D. A. Rainey 		  1169

Asteroidal Collisions and Regoliths: Some Additional Model Considerations
F. Horz, R. B. Schaal 		  1170

XPS and STEM Studies of Allende Acid Residues
R. M. Housley, D. R. Clarke 		  1171

Melting Relations of Portion of the System Fe-S to 32 KB with Implication to the Nature of Mantle - Core Boundary
W.-L. Huang, R. J. Williams 		  1172

Petrogenesis in a Heterogeneous Moon
N. Hubbard 		  1173

Rare Gases in Stratospheric "brownlee" Particles: Proof of Extraterrestrial Origin
B. Hudson, G. J. Flynn, P. Fraundorf, C. M. Hohenberg, J. Shirck 		  1174

Atmospheric Origin and Evolution: the Evidence from Venus
D. M. Hunten 		  1175

Mineralogy and MG Isotopic Composition of Type b2 Inclusions from Leoville and Allende
I. D. Hutcheon, I. M. Steele 		  1176

Multiple Impact History of a Genomict Breccia 73217 AS Inferred from Pyroxene Crystallization Sequences
T. Ishii, I. S. McCallum, S. Ghose 		  1177

Sm-Nd Isotopic Systematics of Chondrites
S. B. Jacobsen, G. J. Wasserburg 		  1178

Petrology of Ancient Mare-Type Basalt Clasts from Breccia 73255
O. B. James, J. J. McGee 		  1179

Petrology of Felsite Clasts from Consortium Breccia 73255
O. B. James, J. J. McGee 		  1180

Structure and Evolution of Young Circular and Old Irregular Maria
P. Janle 		  1181

Display of Some Unusual Meteorites from Antarctica
P. H. Johnson, R. A. Score, C. M. Schwarz, B. Mason 		  1182

Meteoritic Actinide Chemistry: Laboratory Partitioning Studies
J. H. Jones, T. M. Benjamin, R. Heuser, D. S. Burnett 		  1183

CL, P2O5, BR and U Partitioning among Mineral Separates from Mare Basalt 75055
S. Jovanovic, G. W. Reed 		  1184

Extraction of Volatiles from Lunar Core and Drive Tube Sections
S. Jovanovic, G. W. Reed, J. L. Winkler, J. Warren 		  1185

Experimental Ranges of the Solar Wind Ions Krypton and Xenon in Minerals
A. J. T. Jull, W. A. Grant, C. Christodoulides, C. T. Pillinger 		  1186

Three-Station Radar Maps of Venus: the 1978 Inferior Conjunction
R. F. Jurgens, R. M. Goldstein, A. I. Zygielbaum 		  1187

Isotopically Anomalous AG in Two Iron Meteorites
T. Kaiser, W. R. Kelly, G. J. Wasserburg 		  1188

Track Studies of Weston Meteorite Chondrules
L. L. Kashkarov, L. I. Genaeva, A. K. Lavrukhina 		  1189

The Tectonic Difference of Venus from the Earth
W. M. Kaula 		  1190

The Apollo 16 Regolith: Comparative Petrology of the >20 and <20 um Soil Fractions
M. J. Kempa, J. J. Papike 		  1191

Isotopic Clues to Organic Synthesis in the Early Solar System
J. F. Kerridge 		  1192

Carbon, [DELTA]13C, N and he in Grain Size Fractions Sieved in Freon
J. F. Kerridge, I. R. Kaplan, D. A. Winter 		  1193

Exsolution and Thermal History of Luna 24 Clinopyroxenes
N. R. Khisina, M. A. Carpenter, M. A. Nazarov, L. V. Petushkova 		  1194

- and High-Resolution Thermal Mapping of Mars
H. H. Kieffer, P. R. Christensen, J. R. Zimbleman 		  1195

Regional Correlations of Martian Remote Sensing Data
H. H. Kieffer, P. A. Davis, L. A. Soderblom 		  1196

Geochemistry of Mare Type Crust as Inferred by the Composition of Mare Crisium Regolith
W. Kiesl, F. Kluger, P. Schindler, J. Ortner 		  1197

Morphologic Remnants of a Lava Lake, Eastern Snake River Plain, Idaho
J. S. King, R. Greeley 		  1198

Accretionary Dark Rims in Unequilibrated Chondrites
T. V. V. King, E. A. King 		  1199

Flow Behavior of Droplet Chondrules in the Manych (L-3) Chondrite
L. C. Klein, B. Fasano, R. H. Hewins 		  1200

The Morphology Microphysics and Cloud Processes of the Clouds of Venus as Determined from the Pioneer Venus Mission
R. G. Knollenberg 		  1201

IRON-60 as a Possible Heat Source and Chronometer in the Early Solar System
T. P. Kohman, M. S. Robison 		  1202

Identification of a Major Mafic Component in Highland Soils
R. L. Korotev, L. A. Haskin, M. M. Lindstrom 		  1203

Block-Layered Model of Lunar Crust
E. D. Koryakin 		  1204

Brecciation Chronology of Xenolithic Chondrites Using Fission Tracks
B. K. Kothari, R. S. Rajan 		  1205

Focal Mechanism of Deep Moonquakes
J. Koyama, Y. Nakamura 		  1206

Luna 24: a Second Case for Early Magnesian Mare Fillings
G. Kurat, A. Kracher 		  1207

Cyclic Fatigue Fracture, a Possible Mechanism for Deep Focus Moonquakes
K. Kurita, H. A. Spetzler 		  1208

Morphology of Fresh Martian Craters as an Indicator of the Depth of the Upper Boundary of the Ice-Bearing Permafrost: a Photogeologic Study
R. O. Kuzmin 		  1209

The Lunar Regolith: Comparative Petrology of the Sampling Sites
T. C. Labotka, M. J. Kempa, C. White, J. J. Papike 		  1210

Petrology of a Quickly Cooled Pigeonite-Basalt Clast in the Antarctic Meteorite ALHA 77302
T. C. Labotka, J. J. Papike 		  1211

Regolith of the Eucrite Parent-Body Petrology of the Howardite Meteorites
T. C. Labotka, J. J. Papike 		  1212

The Evolution of an Impact Generated Atmosphere
M. A. Lange, T. J. Ahrens 		  1213

Impact Melting on Earth and Moon: Theoretical and Observational Results
M. A. Lange, B. R. Hawke 		  1214

A Model for Small Body Regolith Evolution: the Critical Paramters
Y. Langevin, M. Maurette 		  1215

The Effects of Hydrogen on Gamma-Ray Emission from Planetary Surfaces
J. R. Lapides, M. S. Spergel, O. W. Lazareth, P. W. Levy, R. C. Reedy, J. I. Trombka 		  1216

Chemical Study of Size Fractions from Breccia 14301
J. C. Laul, E. A. Lepel 		  1217

The Lunar Regoliths "comparative Chemistry of the Sampling Sites"
J. C. Laul, E. A. Lepel 		  1218

Petrological and Chemical Properties of Meteorites with Different Orbits
A. K. Lavrukhina, G. K. Ustinova, G. V. Baryshnikova 		  1219

Thermal, Stress and Mineralogical Evolution of Small Planetary Objects
A. R. Lazarewicz, M. J. Gaffey 		  1220

The Oxygen Isotopic Composition in Allende Inclusion HAL and the Origin of the FUN Anomalies
T. Lee, T. K. Mayeda, R. N. Clayton 		  1221

Petrography, Mineralogy and Origin of the Indarch Enstatite Chondrite
C. A. Leitch, J. V. Smith 		  1222

Carbynes: Carriers of Primordial Noble Gases in Meteorites
R. S. Lewis, J. Matsuda, A. G. Whittaker, E. J. Watts, E. Anders 		  1223

Magnetic Anomalies Antipodal to Large Impact Basins
R. P. Lin, F. El-Baz, L. L. Hood, S. K. Runcorn, P. H. Schultz 		  1224

On Compositional Relationships among Lunar Highland Materials
M. M. Lindstrom, L. A. Haskin, R. L. Korotev 		  1225

The Experimental Determination of Cooling Rates of Rocks: Some Complications
G. E. Lofgren, D. P. Smith 		  1226

Martian Outflow Channels Sculptured by Glaciers, II
B. K. Lucchitta 		  1227

Interpretation of Laboratory Sample Photometry by Means of a Generalized Radiative Transfer Theory
K. Lumme, E. Bowell, B. Zellner 		  1228

Chemistries of Lithic Fragments from the Apollo 17 Drill Core Sections 70003, 70005 and 70007-III-ANORTHOSITES and Chemically Unique Fragments
M.-S. Ma, R. A. Schmitt 		  1229

Chemistry of Lithic Fragments from the Apollo 17 Drill Core Sections 70003, 70005, and 70007-II-KREEP and ANT
M.-S. Ma, R. A. Schmitt 		  1230

Luna 24 VLT Microgabbro and Recrystallized Basalt - New Chemical Data
M.-S. Ma, R. A. Schmitt 		  1231

Petrogenesis of Apollo 11 Mare Basalts: New Chemical Data of 30 Basaltic Fragments from Cores 10004 and 10005
M.-S. Ma, R. A. Schmitt 		  1232

Aluminous Mare Basalts and Basaltic-Textured Kreepy Rocks from Apollo 14 Coarse Fines
M.-S. Ma, R. A. Schmitt, R. D. Warner, G. J. Taylor, S. Barker, K. Keil 		  1233

VLT Mare Basalt and Aluminous Mare Basalt from Apollo 17 Drill Core
M.-S. Ma, R. A. Schmitt, S. Wentworth, G. J. Taylor, R. D. Warner, K. Keil 		  1234

Structural and Textural Variations in Carbonaceous Chondrite Matrices
I. D. MacKinnon, P. R. Buseck 		  1235

Refractory Inclusions in Murchison: Recovery and Mineralogical Description
G. J. MacPherson, M. B. Matthews, T. Tanaka, E. Olsen, L. Grossman 		  1236

Formation of the c1 Carbonaceous Chondrite Minerals by Hydrothermal Alteration of Interstellar Dust Grains
P. Maloney, C. T. Herzberg 		  1237

On the Possibility of Origin of the - Al-Rich Inclusions by Means of Thermal Alteration of c2 Chondrites
T. V. Malysheva, I. D. Shevaleevsky, E. J. Shcherbovsky 		  1238

Mg-Carbonates and Sulfates on Antarctic Meteorites
U. B. Marvin, K. Motylewski 		  1239

A Pristine Eucritic Gabbro from Descartes and its Exotic Kindred
U. B. Marvin, P. H. Warren 		  1240

Distribution of Impactites in Some Large Astroblemes of the U.S.S.R. Territory
V. L. Masaitis, M. S. Mashchak 		  1241

Immiscibility of Impact Melts
V. L. Masaitis, A. I. Raikhlin, M. S. Mashchak 		  1242

Clastic Dikes of the Kara Crater Pai-Khoi
M. S. Mashchak, V. A. Ezersky 		  1243

Pioneer Venus Radar Results: Geomorphology from Imaging and Altimetry
H. Masursky, E. Eliason, P. G. Ford, G. E. McGill, G. H. Pettengill, G. G. Schaber, G. Schubert 		  1244

Heat Flow from io (j I)
D. L. Matson, G. A. Ransford, T. V. Johnson 		  1245

Stress Histories Retained in Olivines from Pallasite Meteorites
T. Matsui, S. Karato, T. Yokokura 		  1246

On the Pallasite Problem
T. Matsui, T. Yokokura 		  1247

Oxygen Isotopic Compositions of Some Unique Meteorites
T. K. Mayeda, R. N. Clayton 		  1248

Definition and Characterization of Mars Global Surface Units: Preliminary Unit Maps
T. B. McCord, R. B. Singer, J. B. Adams, B. R. Hawke, J. W. Head, R. L. Huguenin, C. M. Pieters, S. H. Zisk, P. Mouginis-Mark 		  1249

Comparative Thermal Histories of Matrix from Apollo 17 Boulder 7 Fragment-Laden Melt Rocks
J. J. McGee, G. L. Nord, M.-V. Wandless 		  1250

Matrix Phyllosilicates of the Antarctic c2 Chondrite ALHA 77306
T. R. McKee, C. B. Moore 		  1251

Upper Limits for the Terrestrial Ages of Some Antarctic Meteorites Using Thermoluminescence
S. W. S. McKeever, S. A. Durrani 		  1252

Multi-Ringed Basins in the Solar System: a "new" Paradigm
W. B. McKinnon, H. J. Melosh 		  1253

Experimental Studies Bearing on Magnetite-Alloy Associations in the Allende Meteorite
B. M. McMahon, S. E. Haggerty, R. Bence 		  1254

Petrographic Comparison of Light/dark Fractions in the Leighton Chondrite
H. Y. McSween, M. E. Lipschutz 		  1255

Shock Metamorphic Features in Allan Hills 77005 Meteorite
H. Y. McSween, D. Stoffler 		  1256

Metallic Particles in the Glass Coatings of Lunar Highland Samples 65315, 67435 and 78235
S. Mehta, J. I. Goldstein 		  1257

Evidence for Pure NEON-22 in Orgueil and Murchison
F. O. Meier, M. H. A. Jungck, P. Eberhardt 		  1258

Tectonic Patterns on Reoriented and Tidally Relaxed Planets
H. J. Melosh 		  1259

Thorium Concentrations in the Imbrium and Adjacent Regions of the Moon
A. E. Metzger, E. L. Haines, M. I. Etchegaray-Ramirez, B. R. Hawke 		  1260

The Lunar Magma Ocean, a Transient Lunar Phenomenon?
J. W. Minear 		  1261

Petrogenesis on the Eucrite/diogenite Parent Body as Inferred from Modeling Cumulate Formation
D. W. Mittlefehldt, M. J. Drake 		  1262

a Model of the Ordinary Chondrite Parent Body
M. Miyamoto, N. Fujii, H. Takeda 		  1263

Earth's Upper Mantle: Volatile Element Distribution and Origin of Siderophile Element Content
J. W. Morgan, G. A. Wandless, R. K. Petrie, A. J. Irving 		  1264

Thermal and Deformational History of Diogenites and a Lunar Norite, as Determined by Electron Microscopy and Crystallography
H. Mori, H. Takeda 		  1265

About the Initial Evolution of Atmosphere and Climate of the Earth Type Planets
V. I. Moroz, L. M. Mukhin 		  1266

Origins and Size Distribution of Metallic Iron in the Lunar Regolith
R. V. Morris 		  1267

Feo and Is/feo Depth Profiles for the Apollo 14 Cores 14210/11 and 14220
R. V. Morris, H. V. Lauer 		  1268

An Emplacement Sequence for Martian Fluidized Ejecta Craters
P. J. Mouginis-Mark 		  1269

Why are There Different Ejecta Morphologies for Martian Impact Craters?
P. J. Mouginis-Mark 		  1270

Amorphous gels as possible analogs to martian weathering products
D. L. Evans, J. B. Adams 		  1271

Volume Estimates of Fluidized Ejecta Deposits for Craters in the Northern Plains of Mars
P. J. Mouginis-Mark, D. L. Carey 		  1272

Geological Constraints for the SOLIS Planum "oasis" on Mars
P. J. Mouginis-Mark, M. J. Cintala, J. L. Whitford-Stark 		  1273

Eolian Mantling Processes on Martian Canyon Rims
P. J. Mouginis-Mark, J. W. Head 		  1274

Radar Analysis of Arsia Mons Lavas, Mars
P. J. Mouginis-Mark, S. H. Zisk 		  1275

Radar Analysis of Surface Materials in the Memnonia Region of Mars
P. J. Mouginis-Mark, S. H. Zisk 		  1276

Near Surface Magma Movement
O. H. Muller, M. R. Muller 		  1277

Emplacement of Martian Rampart and Pedestal Ejecta Blankets
P. Mutch, A. Woronow 		  1278

Trace Element Concentrations in Glassy Silicate Spherules and Microtektites from Deep-Sea Sediments
H. Nagasawa, K. Yamakoshi, R. L. Korotev, L. A. Haskin, B. P. Glass 		  1279

Magnetic Classificaton of Antarctic Meteorites
T. Nagata 		  1280

Preliminary Description and Interpretation of Drive Tube 12027
J. S. Nagle 		  1281

Shallow Moonquakes: are they Comparable to Earthquakes?
Y. Nakamura 		  1282

Seismic Q of the Upper Mantle of the Moon
Y. Nakamura, J. Koyama 		  1283

Periodicity in Io's Atmospheric Mass: Evidence from Post-Eclipse Brightness
D. B. Nash, D. L. Matson 		  1284

Characterization of Solar and Galactic Cosmic Ray Produced Noble Gas Components in Lunar Soils and Rocks
C. M. Nautiyal, J. T. Padia, M. N. Rao, T. R. Venkatesan 		  1285

The Occurrence of Pentlandite and the Geochemistry of NI in Luna 24 Basalts
M. A. Nazarov, L. S. Tarasov, I. D. Shevaleevsky 		  1286

Gabbroic and Basaltic Clasts in Mesosiderites: Unique Achondritic Tridymite-Phosphate Two-Pyroxene Rock Types
C. E. Nehru, M. Prinz, J. S. Delaney, G. E. Harlow, S. Frishman 		  1287

A Model for Hydrothermal Alteration of Impact Melts on the Earth and Mars
H. E. Newsom 		  1288

Titanium Abundances in Terrestrial, Lunar and Meteoritic Samples
F. R. Niederer, D. A. Papanastassiou, G. J. Wasserburg 		  1289

"planetary" Noble Gases: Rare-Gas Trapping by Laboratory Carbon Condensates
S. Niemeyer, K. Marti 		  1290

Ages of Antarctic Meteorites
K. Nishiizumi, J. R. Arnold 		  1291

53MN Measurements in Individual Rocklets from 60010 and in Lunar Core 70009
K. Nishiizumi, M. T. Murrell, J. R. Arnold, M. Imamura 		  1292

Geochemical Evidence for the Role of Ilmenite and Clinopyroxene in the Early Lunar Differentiation
M. D. Norman, G. Ryder 		  1293

Evidence for Hydrothermal Alteration in a Carbonaceous Xenolith from the Plainview (H5) Chondrite
S. Nozette, L. L. Wilkening 		  1294

Isotopic and REE Studies of 12038: Implications for Petrogenesis of Aluminous Mare Basalts
L. E. Nyquist, J. L. Wooden, C.-Y. Shih, H. Wiesmann, B. M. Bansal 		  1295

Cometary Impact Calculations: Flat Floors, Multirings and Central Peaks
J. D. O'Keefe, T. J. Ahrens 		  1296

Calculations of Impact Melt Generation and Transport
D. L. Orphal, W. F. Borden, S. A. Larson, P. H. Schultz 		  1297

Optical and X-Ray Studies on Experimentally Shocked Alkali Feldspar Single Crystals
R. Ostertag, D. Stoffler, U. Hornemann 		  1298

Colloidal Separates from an Allende Acid Residue
U. Ott 		  1299

Inert Gases in Fifteen Iron Meteorites
R. L. Palma, D. Heymann 		  1300

The Meteoritic Contamination of Terrestrial and Lunar Impact Melts and the Problem of Indigenous Siderophiles in the Lunar Highlands
H. Palme 		  1301

The Meteoritic Component of Impact Melts from European Impact Craters
H. Palme, W. Rammensee, U. Reimold 		  1302

The Apollo 17 Drill Core: Calculated and Observed Chemistry and the Nature of the Fused Soil Component
J. J. Papike, J. C. Laul, E. A. Lepel, C. White, K. Baldwin 		  1303

High Temperature Crystal Field Spectra of Transition Metal-Bearing Minerals: Relevance to Remote-Sensed Spectra of Planetary Surfaces
K. M. Parkin, R. G. Burns 		  1304

Viscous Degradation of Impact Craters on Icy Satellite Surfaces
E. M. Parmentier, M. L. Allison, M. J. Cintala, J. W. Head 		  1305

Some Possible Implications of Fracturing on Europa
E. M. Parmentier, P. Helfenstein, J. W. Head 		  1306

Effects of Atmospheric Breakup on Crater Field Formation
Q. R. Passey 		  1307

Isotopic Fractionation during Accretion of Allende: SR Double-Spike Data from Olivine Chondrules
P. J. Patchett 		  1308

Tidal Dissipation, Orbital Evolution and the Nature of Saturn's Inner Satellites
S. J. Peale, P. Cassen, R. T. Reynolds 		  1309

On the Q of Jupiter
S. J. Peale, R. J. Greenberg 		  1310

Environments of Martian Wind Streaks
A. R. Peterfreund 		  1311

Venus Topography and Meter-Scale Surface Roughness as Seen by the Pioneer Orbiter Radar
G. H. Pettengill, P. G. Ford, G. B. Loriot, H. Masursky, E. Eliason, G. E. McGill 		  1312

Formation of Bowl-Shaped Craters
A. J. Piekutowski 		  1313

Near-Infrared Lunar Spectra: Patterns in the Increasing Data Set
C. M. Pieters, S. Flam, T. McCord 		  1314

Lunar Core Multispectral Imaging Experiment: First Results
C. M. Pieters, S. Waltz, P. Butler, B. R. Hawke 		  1315

Terrain Dependence of Crater Morphology on Mars: both yes and no
R. J. Pike 		  1316

Theory of Origin of Circular Ring Features in the James Bay Lowlands and Southwestern Baffin Island
W. H. Pinson 		  1317

Tectonic Features of Southeast Tharsis
J. B. Plescia, L. E. Roth, R. S. Saunders 		  1318

Estimates of the Thickness of the Tharsis Lava Flows and Their Implications for the Nature of the Origin of the Elevation of the Tharsis Plateau
J. B. Plescia, R. S. Saunders 		  1319

Experimental Solidification of a Eucrite Basalt: Microprobe Studies
M. A. Powell, D. Walker, J. F. Hays 		  1320

ALHA 77219: a New Antarctic Mesosiderite and a Comparison with Other Mesosiderites and Related Achondrites
M. Prinz, C. E. Nehru, J. S. Delaney, G. E. Harlow, R. L. Bedell 		  1321

Winonaites: a Primitive Achondritic Group Related to Silicate Inclusions in IAB Irons
M. Prinz, D. G. Waggoner, P. J. Hamilton 		  1322

On Constraining Lunar Mantle Temperatures from Gravity Data
S. Pullan, K. Lambeck 		  1323

Lunar Fractionation Trends are not Anomalous
L. D. Raedeke, I. S. McCallum 		  1324

Rocks of Terrestrial Impact Craters: Problems of Classification
A. I. Raikhlin, T. V. Selivanovskaya, V. L. Masaitis 		  1325

Unequilibrated Metals and Sulfides in the Bishunpur l3 Chondrite
E. R. Rambaldi, J. T. Wasson 		  1326

The Mixing Process of Different Target Lithologies in the Lappajarvi Impact Melt
W. U. Reimold, D. Stoffler, D. Stockelmann 		  1327

Rare Gases in Individual Meteor Ablation Spherules
J. H. Reynolds, P. M. Jeffery 		  1328

Search for 129XE in Mineral Grains from Allende Inclusions: an Exercise in Miniaturized Rare Gas Analysis
J. H. Reynolds, G. R. Lumpkin, P. M. Jeffery 		  1329

Chemistry of Apollo 11 Low-K Mare Basalts
J. M. Rhodes, D. P. Blanchard 		  1330

More on Lunar Siderophiles: the Strange Case of Rhenium
A. E. Ringwood, J. W. Delano, S. E. Kesson, W. Hibberson 		  1331

Proportional Retention of i and Radiogenic 129XE in Preheated Allende
W. Rison, A. Zaikowski 		  1332

Hydrogen, Carbon and Nitrogen Isotopes in Organic Extracts and Hf-Treated Residues of the Murchison and Murray Meteorites
F. Robert, R. H. Becker, S. Epstein 		  1333

Anomalous Development of Planar Deformation Features in Shocked Quartz of Porous Lithologies
P. B. Robertson 		  1334

Completion of a Deep Drilling Program at the Flynn Creek Impact Crater, Tennessee
D. J. Roddy 		  1335

Theoretical and Observational Support for Formation of Flat-Floored Central Uplift Craters by Low-Density Impacting Bodies
D. J. Roddy, K. Kreyenhagen, S. Schuster, D. Orphal 		  1336

Calculations of Impact Cratering Mechanics at Meteor Crater, Arizona
D. J. Roddy, S. Schuster, K. Kreyenhagen, D. Orphal 		  1337

Multi-Ring Basins on the Moon, Mars and Mercury
Zh. F. Rodionova, T. P. Skobeleva 		  1338

Radar Altimetry in the Valles Marineris Chaos
L. E. Roth, G. S. Downs, R. S. Saunders, G. Schubert 		  1339

Tectonically Deformed Impact Craters on Venus
A. E. Rubin, C. C. Allen 		  1340

Impact Jetting in Plasticene Clay: a Computational and Experimental Comparison
S. F. Ruhl, J. M. Thomsen 		  1341

Lunar Polar Wandering
S. K. Runcorn 		  1342

On the Search for an Intrinsic Magnetic Field at Venus
C. T. Russell, R. C. Elphic, J. G. Luhmann, J. A. Slavin 		  1343

Ilmenite Saturation at High Pressure in KREEP Basalts: Origin of KREEP and HI-TIO2 in Mare Basalts
M. J. Rutherford, S. Dixon, P. Hess 		  1344

Ni, CO Content of Metal Grains for the Identification of Indigenous Rocks
G. Ryder, M. D. Norman, R. A. Score 		  1345

The Neon Alphabet Game
D. D. Sabu, O. K. Manuel 		  1346

Gas Fugacities in Planetary Interiors and Their Bearing on the Origin of Metallic Cores in the Inner Planets: (1) Earth
M. Sato 		  1347

Pre-Tharsis Martian Tectonism and Volcanism: Evidence from the Coprates Region
R. S. Saunders, L. E. Roth, G. S. Downs, G. Schubert 		  1348

Experimental Shock Lithification of Lunar Soil
R. B. Schaal, F. Horz 		  1349

Meteorite Chronology: 39AR - 40AR Ages of Antarctic Meteorites
O. A. Schaeffer 		  1350

Meteor Crater - Implications of Centrifuge Scaling
R. M. Schmidt 		  1351

Defect Production and Electrical Conductivity in Olivine
R. N. Schock, A. Duba, R. L. Stocker 		  1352

Improved Spatial Resolution and Contrast of Orbital Geochemical Experiments
E. Schonfeld 		  1353

Morphological Effects of Unusual "lavas" on io and Europa
E. Schonfeld, R. Williams 		  1354

OB Associations and Protosolar Abundances
D. N. Schramm, D. L. Tubbs 		  1355

Chromium in Synthetic Basalts: Understanding the Roles of Cr(iii) and of Cr(ii)
H. D. Schreiber, S. M. Andrews 		  1356

The Redox States of Uranium in Synthetic Basaltic Magmas
H. D. Schreiber, S. M. Andrews 		  1357

Chemistry and Noble Gases of the Unusual Stony Meteorite Allan Hills A77081
L. Schultz, H. Palme, B. Spettel, H. Wanke, H. W. Weber 		  1358

Multiple-Body Impacts: Implications for Secondary Impact Processes
P. H. Schultz, D. E. Gault, M. Mendenhall 		  1359

Cometary Collisions on the Moon and Mercury
P. H. Schultz, L. J. Srnka, S. I. Pai, S. Menon 		  1360

Mars Tharsis Region: Volcanic - Tectonic Events in the Stratigraphic Record
D. H. Scott 		  1361

Thermal History of Some Xenolithic Ordinary Chondrites
E. R. D. Scott, R. S. Rajan 		  1362

Formation of IAB and IIICD Iron Meteorites
D. W. Sears, J. Willis, J. T. Wasson 		  1363

Enhanced Sputtering of Dielectric Materials and its Relationship to Track Registration
L. E. Seiberling, J. E. Griffith, T. A. Tombrello 		  1364

Lunar Mare Arches and Ridges: Relation of Ridge Lobes to Small Pre-Existing Craters
V. L. Sharpton, J. W. Head 		  1365

Albedo Distribution Function of the Lunar Surface
V. V. Shevchenko 		  1366

Thermal Modification of Microcracks in Lunar Rocks and Revised Estimates for the Elastic Properties of the Shallow Moon
G. Simmons, M. L. Batzle, A. L. Harlow 		  1367

Antarctic Meteorites: a Petrographic Study of ALHA77302
S. B. Simon, S. E. Haggerty 		  1368

Bulk Chemistry of a Diverse Chondrule Suite in the Allende Meteorite
S. B. Simon, S. E. Haggerty 		  1369

Petrologic Implications of Accretion of Large (100 Km) Slow (8 Km/sec) Projectiles
C. H. Simonds 		  1370

Secondary Impact Craters around Lunar, Mercurian, and Martian Craters
J. Singer, P. H. Schultz 		  1371

The Dark Materials on Mars: I. New Information from Reflectance Spectroscopy on the Extent and Mode of Oxidation
R. B. Singer 		  1372

The Dark Materials on Mars: II. New Mineralogic Interpretations from Reflectance Spectroscopy and Petrologic Implications
R. B. Singer 		  1373

Venus Gravity Anomalies
W. L. Sjogren, P. W. Birkeland, R. J. Phillips, R. N. Wimberly 		  1374

Origin of o- and E-Chondrites by Cooling, Sorting, Aggregation, Condensation, Metamorphism and Brecciation of Debris from Planetesimal Collisions
J. V. Smith 		  1375

Interpretation of Non-Mare and Mare Samples in Terms of New Model for Sequential Episodic Differentiation of a Growing Moon
J. V. Smith, E. C. Hansen 		  1376

Erosion of Particles in Planetary Rings and Interplanetary Space
R. Smoluchowski 		  1377

Tharsis Province: Uplift by Anomalous Mantle, or Concentration of Tectonism and Volcanism in a Locally Thin Lithosphere?
S. C. Solomon, J. W. Head 		  1378

Volatilities of Trace Elements in Minerals and Agglutinates of Sample 75080 Investigated by Heating Experiments
J. Sorensen, F. Wegmuller, U. Krahenbuhl, H. R. Vongunten 		  1379

Energy Averaged Neutron Cross Sections for Rock-Forming Elements at Astrophysically Interesting Temperatures
M. S. Spergel, O. W. Lazareth, L. A. Slatest, P. W. Levy 		  1380

The Contribution of Stress Corrosion Cracking to Q
H. A. Spetzler, I. C. Getting 		  1381

Actinide Nuclides: Unsuitable Progenitors for KR and xe Anomalies in Carbonaceous Chondrites
B. Srinivasan, K. F. Flynn 		  1382

A Cometary Origin of Reiner-Gamma Magnetic Anomalies
L. J. Srnka, P. H. Schultz 		  1383

An Oxygen Geobarometer for Lunar High-Titanium Basalts
F. T. Stanin, L. A. Taylor 		  1384

Meteorite Actinide Chemistry: Th-U Microdistributions
M. I. Stapanian, D. S. Burnett, M. J. Furst 		  1385

Ion-Probe Determination of li, na, mg, ti, SR and BA in Lunar Plagioclase
I. M. Steele, J. V. Smith 		  1386

Core Formation Dynamics and Primordial Planetary Dynamos
D. J. Stevenson 		  1387

Core Evolution and Magnetism of the Terrestrial Planets
D. J. Stevenson, G. Schubert, P. Cassen, R. T. Reynolds 		  1388

Planetesimal Acceleration by the Transfer of Energy from Circular Orbital Motion to Random Motion
G. R. Stewart 		  1389

Subsolidus Phase Equilibria in the System FEO-MGO-CR2O3-AL203-TIO2
B. Stier, E. Woermann, A. Elgoresy 		  1390

Mineral Assemblages in Planetary Interiors: Predictions Based on Estimates of Planetary Composition
E. Stolper 		  1391

Ina, a Lunar Caldera?
P. L. Strain, F. El-Baz 		  1392

Martian Color/albedo Units: Viking Lander 1 Stratigraphy VS. Orbiter Color Observations
E. L. Strickland 		  1393

Volcanic Eruptions on IO
R. G. Strom, R. J. Terrile, H. Masursky, C. Hansen 		  1394

Thellier Paleointensity: Studies on Lunar Samples
N. Sugiura, D. W. Strangway 		  1395

Planet and Star Formation in Turbulent Collapse
E. M. D. Symbalisty, D. N. Schramm, P. J. Wiita 		  1396

Comparisons of Kreepy Clasts in Lunar Breccias with Basaltic Clasts in Eucritic Polymict Breccias
H. Takeda, M. Miyamoto, T. Ishii 		  1397

Yamato and Allan Hills Meteorites and Their Bearing on the Parent Bodies
H. Takeda, K. Yanai, K. Shiraishi 		  1398

Refractory Inclusions in Murchison: Chemistry and MG Isotopic Composition
T. Tanaka, A. M. Davis, I. D. Hutcheon, M. B. Matthews, E. Olsen, G. J. MacPherson, L. Grossman 		  1399

Cm-U and Pu-Xe Chronology of Meteoritic Whitlockite: Confirmation of Live 247CM in Early Solar System
M. Tatsumoto, T. Shimamura, O. K. Manual, D. M. Unruh, P. Pellas 		  1400

Age of the Galaxy: Isotopic Composition of u, sr, sm, and nd in Allende Meteorite
M. Tatsumoto, T. Shimamura, P. J. Patchett, W. M. White 		  1401

Major-Element Compositional Variations of KREEP
G. J. Taylor, S. Wentworth, R. D. Warner, K. Keil, M.-S. Ma, R. A. Schmitt 		  1402

Geochemical Constraints on Planetary Compositions: Refractory and Moderately Volatile Elements
S. R. Taylor 		  1403

Nitrogen Isotopes in the Allende Meteorite
M. H. Thiemens, R. N. Clayton 		  1404

Solar and Cosmogenic Nitrogen in the Apollo 17 Deep Drill Core
M. H. Thiemens, R. N. Clayton 		  1405

Model for Infrared/radar Anomaly Evolution
T. W. Thompson, J. A. Cutts, S. H. Zisk, R. W. Shorthill 		  1406

The Development of the Ejecta Plume in a Laboratory-Scale Impact Cratering Event
J. M. Thomsen, M. G. Austin, P. H. Schultz 		  1407

Ganymede and Callisto: Thermal Evolution Models and Constraints from Voyager Data
C. H. Thurber, A. T. Hsui, M. N. Toksoz 		  1408

Laboratory Measurements of Seismic Q for Evaluation of Proposed Attenuation Mechanisms
B. R. Tittmann, V. A. Clark, L. Ahlberg, T. W. Spencer 		  1409

Compressive Strength, Seismic q, Elastic Modulus, and Acoustic Emission Studies of Rock
B. R. Tittmann, V. A. Clark, A. Arora, T. W. Spencer 		  1410

Evolution of Venus
M. N. Toksoz, J. Arkani-Hamed, A. T. Hsui 		  1411

Superheavy Elements in the Evolution of the Earth, the Moon and Asteroids
K. D. Tolstov 		  1412

The Core and the Magnetic Field of Uranus
M. Torbett, R. Smoluchowski 		  1413

Some New Mineral Stability Relations in Cosmic Systems
B. M. P. Trivedi, J. W. Larimer 		  1414

Remote X-Ray Sensing Methods for Planetary Exploration
J. I. Trombka, C. J. Crannell, C. Andre, A. Delsemme, S. M. Seltzer, A. Mendes, W. S. Muney, R. L. Schmadebeck, L. Evans, L. I. Yin, J. C. Brandt 		  1415

Estimate of Characteristic Grain Sizes for Martian Dunes
H. Tsoar, R. Greeley 		  1416

Cryogenic Collection of Particles by Solid Xenon Surfaces
A. L. Turkevich, T. E. Economou, E. Blume, R. Szara 		  1417

Loss of Radiogenic Argon from Chondrites and Estimates of Fragmentation Temperatures
G. Turner 		  1418

Crystallization Behavior of Albite
D. R. Uhlmann, H. Yinnon, D. Cranmer 		  1419

Chemistry of Nebula Condensation: Experimental Study
A. A. Ulyanov, M. A. Nazarov, E. J. Shcherbovsky 		  1420

Excess PB in L-Chondrites is it Terrestrial?
D. M. Unruh, M. Tatsumoto 		  1421

Phenomenological Expression for Estimation of Aphelia of Fallen Meteorites
G. K. Ustinova, A. K. Lavrukhina 		  1422

Tidal Heating of a Viscoelastic Moon: Comparison to the "elastic" Calculation
W. E. Vanarsdale, J. A. Burns 		  1423

Vacuum Ultraviolet Reflectance Spectra of Group E Chondrites and Achondrites
J. K. Wagner, A. J. Cohen, B. W. Hapke, W. D. Partlow 		  1424

Mass and Heat Transport in a Lunar Magma Ocean by Sinking Blobs
D. Walker, B. H. Hager, J. F. Hayes 		  1425

Scanning Secular Resonances: a Cosmogonical Broom?
W. R. Ward 		  1426

Allende CAI 3643 - a Layered Record of Protosolar Nebula Condensation
D. A. Wark 		  1427

Proton Microprobe Analysis of Perovskite in Allende - Al-Rich Inclusions
D. A. Wark, T. C. Hughes, M. Lucas, C. D. McKenzie 		  1428

More Early Solar System Stratigraphy: Coarse-Grained Cai's
D. A. Wark, J. F. Lovering 		  1429

Second Thoughts about Rims
D. A. Wark, J. F. Lovering 		  1430

Anomalous Mineral Chemistry of Allende FUN Inclusions cl, EK-141 and EGG 3
D. A. Wark, G. J. Wasserburg 		  1431

Further Foraging for Pristine Nonmare Rocks
P. H. Warren, J. T. Wasson 		  1432

Contribution of the Mantle to the Lunar Asymmetry
J. T. Wasson, P. H. Warren 		  1433

Solar Wind Sputtering Effects on Mars and Venus
C. C. Watson, P. K. Haff, T. A. Tombrello 		  1434

Mt. Egerton and the Aubrite Parent Body
T. R. Watters, M. Prinz 		  1435

Significance of Major and Minor Element Variations in Plagioclase in Highlands Breccia 67915
P. W. Weiblen, W. C. Day, J. D. Miller 		  1436

A Stochastic Model of Asteroid Rotation
S. J. Weidenschilling 		  1437

Shock-Induced Color Changes in Nontronite: a Possible Martian Surface Process
R. J. Weldon, M. B. Boslough, T. J. Ahrens 		  1438

Studies of the Formation of Subglacially-Formed Volcanoes in Iceland Using Paleomagnetic Methods
D. B. Wenner, B. B. Ellwood 		  1439

Could the Solar Wind have been the Source of the High Concentration of 36AR in the Atmosphere of Venus?
G. W. Wetherill 		  1440

The Craters of Mare Imbrium
J. L. Whitford-Stark 		  1441

The Stratigraphy of Mare Imbrium
J. L. Whitford-Stark, J. W. Head 		  1442

Solar Noble Gas Saturation in Lunar Regolith Minerals; does it Occur?
R. Wieler, G. Poupeau, P. Signer 		  1443

Emplacement of Apollo 14 and 16 Breccias as Primary Basin Ejecta
D. E. Wilhelms, G. E. Ulrich, H. J. Moore, C. A. Hodges 		  1444

Wind Erosion on Mars: an Estimate of the Rate of Abrasion
S. H. Williams, R. Greeley 		  1445

Ascent and Emplacement of Basaltic Magma on the Earth and Moon
L. Wilson, J. W. Head 		  1446

The Formation of Eroded Depressions around the Sources of Lunar Sinuous Rilles: Theory
L. Wilson, J. W. Head 		  1447

Scanning Electron Microscopic Analysis of Volcanic Ash
K. Wohletz, D. Krinsley 		  1448

Brecciated Meteorites as Probes of the Asteroid Belt
R. Wolf, M. Ebihara, E. Anders 		  1449

Statistical Pattern Recognition as an Aid in Geologic Interpretation of Martian Terrains
R. W. Wolfe, S. Kaplan 		  1450

New Observations of Martian Basins
C. A. Wood 		  1451

Formation of Acid Hydrolysable Carbon and Superparamagnetic Iron during Agglutination?
M. R. Woodcock, A. E. Fallick, C. T. Pillinger 		  1452

Khohar Metals and Their Different Thermal Histories
D. S. Woolum, D. S. Burnett, J. Conca 		  1453

Small Volcanic Constructs in Utopia Planitia
A. Woronow 		  1454

On the Origin of Martian Pedestal, Lobate, and Multilobate Ejecta Deposits
A. Woronow, P. Mutch 		  1455

The Role of Vaporization and Condensation in the Formation of the Chemical Composition of Impactites
O. I. Yakovlev, O. V. Parfenova 		  1456

Can Electromagnetic Induction Current Heat Io's Interior Effectively?
M. Yanagisawa 		  1457

The Solar Cosmic-Ray Flux during the Last Two Million Years
A. Yaniv, K. Marti, R. C. Reedy 		  1458

On the Barrier to Crystal Nucleation in Lunar Glasses
H. Yinnon, D. R. Uhlmann 		  1459

Confirmation of Anomalous Areas ("oases") on Mars from Earth-Based Radar Data
S. H. Zisk, P. J. Mouginis-Mark 		  1460