Lunar and Planetary Institute






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