Lunar and Planetary Institute






Thirteenth Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

On the Age of Cumulate Norite 78236: an 39AR-40AR Study
U. Aeschlimann, P. Eberhardt, J. Geiss, N. Grogler, J. Kurtz, K. Marti
  1001

Impact of an Asteroid or Comet in the Ocean and Extinction of Terrestrial Life
T. J. Ahrens, J. D. O'Keefe
  1002

Cosmogenic MN-53 in Meteorites
V. A. Alexeev, V. V. Malishev, A. K. Lavrukhina
  1003

Altered Impact Melt Rock and Breccia: Contribution to Martian "soil"
C. C. Allen, J. L. Gooding, K. Keil
  1004

Effects of Target Water on Shock Lithification
C. C. Allen, M. J. Jercinovic, T. H. See, K. Keil
  1005

Constraints on the Nature and Evolution of Ganymede's Crust
M. L. Allison
  1006

Regolith Development Under Micrometeoroid Impact
R. J. Allison
  1007

Application of a Two-Pyroxene Thermometer
D. J. Andersen, D. H. Lindsley
  1008

Magnetic Dipole Moment Estimates for an Ancient Lunar Dynamo
K. A. Anderson
  1009

Additional Evidence of Lunar Terra Volcanism
C. G. Andre, P. L. Strain, W. J. Dove
  1010

Underplating of Archean Continents: Evidence from the Bad Vermillion Lake Anorthosite Complex, Ontario
L. D. Ashwal, W. C. Phinney, D. A. Morrison, J. L. Wooden
  1011

SNC Meteorites: Evidence against an Asteroidal Origin
L. D. Ashwal, J. L. Warner, C. A. Wood
  1012

Lunar Grain Adhesion: Impact and Rebound Below the Hypervelocity Impact Region
D. G. Ashworth, D. G. Dixon, J. A. M. McDonnell
  1013

Gravitational and Other Effects on Impact Cratering Flow Fields Deduced from Computer Simulation Studies
M. G. Austin
  1014

Impact Cratering on Stony and Icy Bodies: Different Mechanisms of Central Peak Formation?
A. T. Basilevsky, B. A. Ivanov
  1015

Nitrogen and Spallation-Produced Noble Gases in the Pinon Iron Meteorite
R. H. Becker, R. O. Pepin
  1016

Melting Experiments on Allende Coarse-Grained Inclusion Compositions
J. R. Beckett, L. Grossman
  1017

The Dark Side of Iapetus
J. F. Bell, M. J. Gaffey, R. H. Brown, D. P. Cruikshank, R. Howell
  1018

Fluid Inclusions in Diogenite ALHA-77256
S. C. Bergman, J. L. Warner, D. J. Henry, L. D. Ashwal, R. Lee-Berman, E. K. Gibson
  1019

Primary Igneous Carbon in Ureilites: Petrologic and Geochemical Evidence
J. L. Berkley, J. H. Jones
  1020

Adsorption and Excess Fission Xenon II: xe Adsorption on a Vacuum Crushed Mineral
T. Bernatowicz, M. Honda, F. Podosek, F. Kramer
  1021

Solar Wind Implantation Synthesis
J.-P. Bibring, F. Rocard
  1022

The Mare Basalt Magma Source Region and Mare Basalt Magma Genesis
A. B. Binder
  1023

66055: a Unique Polymict Breccia, Exotic to the Landing Site, Containing KREEP Glass
E. Blair, G. Ryder
  1024

Solar-Wind Irradiation Effects on Ilmenite
G. E. Blanford
  1025

Quantitative Proton Microprobe Trace Element Analysis of Coexisting Opaque Oxides in Lunar Rocks and Their Genetic Implications
H. Blank, R. Nobiling, K. Traxel, A. El Goresy
  1026

Early Crustal Evolution: Constraints from Variable REE Patterns in Metasedimentary Rocks from the 3800 MA Isua Supracrustal Belt, West Greenland
J. L. Boak, R. F. Dymek, L. P. Gromet
  1027

Effects of Artificial Shock on Argon Retention in an Ordinary Chondrite
D. D. Bogard, F. Horz, P. Johnson, R. Schall, R. Spangler
  1028

Chemical Weathering on Mars: Interactions of Sulfur Dioxide with Olivine and Olivine Tholeiite in Simulated Martian Environments
M. C. Booth, E. K. Gibson, R. Kotra
  1029

Nature of the Apollo 16 Subregolith Basement as Deduced from the Composition of Large Impact Glass Samples
R. Borchardt, D. Stoffler, R. Ostertag, A. Rehfeldt, H. Palme, H. Wanke
  1030

A Model for the Accumulation of Solar Wind Radiation Damage Effects in Lunar Dust Grains
J. Borg, J. P. Bibring, R. Cowsik, Y. Langevin, M. Maurette
  1031

Peaks, Peak Rings, and Multiple Ring Spacing in Impact Basins: Discontinuities in the Function Relationship
J. M. Boyce
  1032

Rare-Earth and Other Trace Elements in Rim and Interior Portions of a Peculiar Allende Chondrule
W. V. Boynton, D. H. Hill
  1033

Analytical Sem/tem Studies of Individual Grains of Disaggregated CP Interplanetary Dust
J. P. Bradley, D. E. Brownlee
  1034

The Deep Structure of Lunar Basins: Implications for Excavated Cavity Volumes
S. R. Bratt, S. C. Solomon, J. W. Head, C. H. Thurber
  1035

Unmelted Meteoritic Material Discovered in the Late Pliocene IR Anomaly
D. E. Brownlee, F. T. Kyte, J. T. Wasson
  1036

A Working Taxonomy for Micrometeorites
D. E. Brownlee, E. Olszewski, M. Wheelock
  1037

Lunar Breakup and Capture Close to the Earth
W. R. Buck
  1038

I-Xe Ages of Individual Bjurbole Chondrules
M. W. Caffee, C. M. Hohenberg, B. Hudson, T. D. Swindle
  1039

Shock Disturbance of I-Xe Systematics
M. W. Caffee, C. M. Hohenberg, B. Hudson, T. D. Swindle
  1040

Space Telescope and Planetary Science
J. Caldwell
  1041

Condensation Events Near the Total Evaporation Front Within the Primitive Solar Nebula
A. G. W. Cameron, M. B. Fegley
  1042

Venus Radar Images
D. B. Campbell, J. K. Harmon, A. A. Hine, J. W. Head
  1043

Liquidus-Phase Relations of the Apollo 14 and Apollo 17 VLT Volcanic Glasses
H.-K. Chen, J. W. Delano, D. H. Lindsley
  1044

Anomalous 107AG/109AG in the Cape York Meteorite
J. H. Chen, T. Kaiser, G. J. Wasserburg
  1045

Ridges in the Old Terrains of Mars
A. F. Chicarro, P. H. Schultz
  1046

Siderophile Trace Elements in the Earth's Oceanic Crust and Upper Mantle
C.-L. Chou, D. M. Shaw, J. H. Crocket
  1047

An Argument against the Global Homogeneity of Martian Fines
P. R. Christensen
  1048

Dark, Intracrater Deposits on Mars
P. R. Christensen
  1049

Kasei Vallis Revisited
P. R. Christensen
  1050

Multi-Ringed Basin Interiors: Structure and Early Evolution of Orientale
S. Church, J. W. Head, S. C. Solomon
  1051

The Distribution of Blocks around a Fresh Lunar Mare Crater
M. J. Cintala, J. B. Garvin, S. J. Wetzel
  1052

The Role of Target Size and Geometry in Impact Events: an Experimental Study
M. J. Cintala, F. Horz, T. D. Thompson
  1053

On the Distribution of zn in Allende Chondrules, Inclusions, and Matrix
E. H. Cirlin, R. M. Housley
  1054

Magnetic Properties and Remanence of Antarctic Shergottite A79001
S. M. Cisowski
  1055

A New Look at Lunar Paleomagnetic Data: Evidence for a Well-Defined Lunar "magnetic Epoch" 3.65 - 3.85 GY BP
S. M. Cisowski, D. W. Collinson, A. Stephenson, S. K. Runcorn
  1056

Possible Comet Samples: the NASA Cosmic Dust Program
U. S. Clanton, J. L. Gooding, D. S. McKay, I. D. R. MacKinnon, A. M. Isaacs, G. A. Nace, E. M. Gabel, J. L. Warren, C. B. Dardano
  1057

A New Look at Magnesium Variations on the Moon
P. E. Clark
  1058

Relationship Between Geology and Geochemistry in the Undarum/spumans Region
P. E. Clark, B. R. Hawke
  1059

Fossil 26MG: Status of a Minority View
D. D. Clayton
  1060

Oxygen Isotopes in Carbonaceous Chondrites and in Achondrites
R. N. Clayton, T. K. Mayeda
  1061

The Stability of Ground Ice in the Equatorial Region of Mars
S. M. Clifford, D. Hillel
  1062

Splosh Craters: Evidence for the Replenishment of Ground Ice in the Equatorial Region of Mars
S. M. Clifford, L. A. Johansen
  1063

Statistical Test of the (square Root Of) 2 Spacing Rule for Basin Rings
G. D. Clow, R. J. Pike
  1064

Case Hardening of the Surface Features: Earth Analogs to the Martian Surface
J. Conca
  1065

Lorentz Forces on the Dust in Jupiter's Ring
G. J. Consolmagno
  1066

Unsampled Mare Basalts and the Evolution of the Moon
G. J. Consolmagno, M. D. Dyar
  1067

A New Model for Estimating Melting and Vaporization in Impacts with Comparison Between Analytic Models and Code Calculations
S. K. Croft
  1068

Hydraulic Fracture and Flow: an Alternate Driving Mechanism for Volcanism on Icy Satellites
S. K. Croft
  1069

Impacts in Ice and Snow: Implications for Crater Scaling on Icy Satellites
S. K. Croft
  1070

Thermal Models of Sulfur and Silicate Magma Interaction, IO
L. S. Crumpler
  1071

Classification of Ten Chinese, Eleven Antarctic and Ten Other Iron Meteorites
W. Daode, D. J. Malvin, J. T. Wasson
  1072

Impact Disruption of Magma Ocean Crust
G. F. Davies
  1073

Catastrophic Disruption and Momentum Transfer in High-Speed Impacts
D. R. Davis, S. J. Weidenschilling
  1074

Rapid Extraction of Relative Topography from Viking Orbiter Imagery
P. A. Davis, L. A. Soderblom, E. M. Eliason
  1075

Development of Planetary Megaregoliths
R. A. de Hon
  1076

Minor Components of Basaltic Achondrites - I. Sulphur
J. S. Delaney
  1077

Minor Components of Basaltic Achondrites - II. Phosphorus
J. S. Delaney
  1078

Mount Padbury Mafic "enclaves" and the Petrogenesis of Mesosiderite Silicates
J. S. Delaney, G. E. Harlow, C. E. Nehru, C. O'Neill, M. Prinz
  1079

Zoning of Minerals in Mafic Clasts from Basaltic Achondrites
J. S. Delaney, C. O'Neill, C. E. Nehru, M. Prinz
  1080

New Type of Polymict Eucrite from Elephant Moraine, Antarctica
J. S. Delaney, M. Prinz, C. O'Neill, G. E. Harlow, C. E. Nehru
  1081

Chemical Systematics among the Moldavite Tektites
J. W. Delano, D. H. Lindsley
  1082

Chromium, Nickel, and Titanium Abundances in 74275 Olivines: More Evidence for a High-Pressure Origin of High-Titanium Mare Basalts
J. W. Delano, D. H. Lindsley
  1083

New Data on the Fractionation Trend in the Apollo 15 Volcanic Green Glasses: Groups b, C
J. W. Delano, D. H. Lindsley
  1084

Nickel, Chromium, and Phosphorus Abundances in Hmg and Bottle-Green Microtektites from the Australasian and Ivory Coast Strewnfields
J. W. Delano, D. H. Lindsley, B. P. Glass
  1085

Petrology and Trace-Element Chemistry of the Apollo 15 Yellow Impact Glasses
J. W. Delano, D. H. Lindsley, M.-S. Ma, R. A. Schmitt
  1086

Rb-Sr Sm-Nd and K-Ca Studies of Cretaceous-Tertiary Boundary Sediments: Possible Evidence for an Oceanic Impact
D. J. Depaolo, F. T. Kyte, B. D. Marshall, J. Smit
  1087

A Petrologic Study of the <10 um Lunar Regolith Chemical Anomaly
J. M. Devine, D. S. McKay, J. J. Papike
  1088

Whitlockite Saturation in Lunar Basalts
J. E. Dickinson, P. C. Hess
  1089

X-Ray Diffraction Study of the Structure of Diaplectic Anorthosite Glass from Manicouagan Impact Crater, Canada
E. Diemann, J. Arndt
  1090

The Surface Texture of the Martian Soil from the Soviet Spacecraft MARS-5 Photopolarimeters
A. Dollfus, M. Deschamps, L. V. Ksanfomaliti
  1091

Apollo 11 Regolith Breccias: a Study of the Clast Population and a Comparison to Soil 10084
T. B. Dorman, S. B. Simon, T. C. Labotka, J. J. Papike
  1092

On the Influence of Nebular Gas Chemistry on the Condensate Compositions
V. A. Dorofeeva, M. I. Petaev, I. L. Khodakovsky
  1093

New Radar-Derived Topography for the Equatorial Belt of Mars
G. S. Downs, P. J. Mouginis-Mark, S. H. Zisk, T. W. Thompson
  1094

Saturn and Titan Probes in the 1990'S
R. J. Drean
  1095

Composition of Shergotty Parent Body: Further Evidence for a Two Component Model of Planet Formation
G. Dreibus, H. Palme, W. Rammensee, B. Spettel, G. Weckwerth, H. Wanke
  1096

Precipitate Distribution in Reduced Olivine
A. Duba, J. N. Boland, J. Akella
  1097

PHOBOS and Deimos Cartography
T. C. Duxbury, J. D. Callahan
  1098

The Motions of PHOBOS and Diemos
T. C. Duxbury, J. D. Callahan
  1099

Martian Satellite Search from Viking Orbiter
T. C. Duxbury, A. C. Ocampo, R. J. Doyle
  1100

Ferric Iron in Lunar Glasses and the Interpretation of Lunar Spectra
M. D. Dyar, G. J. Consolmagno
  1101

Geochemistry of Archaean Metasedimentary Rocks Derived from Older Granitoid Gneiss: an Example from the Malene Supracrustals, SW Greenland
R. F. Dymek, R. Weed, L. P. Gromet
  1102

Geologic Investigations with the Shuttle Imaging Radar Sir-A
C. Elachi
  1103

Genesis of Particulate Material in Terrestrial Deserts and Applications to Mars
F. El-Baz
  1104

Cosmogenic 53MN and 26AL in Meteorite Finds
P. Englert, G. Osadnik, U. Herpers, W. Herr
  1105

Sources of Shape Variation in Lunar Impact Craters -- Fourier Shape Analysis
D. T. Eppler, R. Ehrlich, D. Nummedal, P. H. Schultz
  1106

The (DELTA)18O of the Sanidine Spherules at the Cretaceous-Tertiary Boundary
S. Epstein
  1107

The Critical Cooling Rate for Glass Formation of Lunar Compositions
C.-Y. Fang, H. Yinnon, D. R. Uhlmann
  1108

Viscous Flow Behavior of Four Iron-Containing Silicates with Alumina. Part 1. Effect of Composition
B. V. Fasano, J. M. Wu, L. C. Klein
  1109

Hibonite Condensation in the Solar Nebula
M. B. Fegley
  1110

X-Ray Emission from Young Solar-Type Stars: Implications for the Early Solar System
E. D. Feigelson, G. J. Consolmagno
  1111

Infrared Absorption of Tektites, Impactites and Obsidians as a Genetic Criterion
V. I. Feldman, N. N. Korotaeva, E. V. Sveshnikova
  1112

The Effect of Viscosity on the Volume and Shape of Experimental Impact Craters
J. H. Fink, R. Greeley, D. E. Gault
  1113

14C Terrestrial Ages of Antarctic Meteorites with Counters and with a Van Der Graaf Accelerator
E. L. Fireman, H. R. Andrews, G. C. Ball, R. M. Brown, J. C. D. Milton
  1114

Investigation of the fe, Ni-Phase of the Kainsaz CO Carbonaceous Chondrite
A. V. Fisenko, L. F. Semjonova, E. A. Volodina, A. K. Lavrukhina
  1115

Aluminum-Rich Spinel Aggregates in the Stratosphere: from Earth, or Not?
G. J. Flynn, P. Fraundorf, G. Keefe, P. Swan
  1116

Determination of the Mass, Surface Density, and Volume Density of Individual Interplanetary Dust Particles
P. Fraundorf, C. Hintz, O. Lowry, K. D. McKeegan, S. A. Sandford
  1117

Deceleration Heating of Interplanetary Dust in the Earth's Atmosphere and its Simulation Using Analog Materials
P. Fraundorf, T. Lyons, S. A. Sandford, P. Schubert
  1118

Multidisciplinary Studies of Individual Stratospheric Micrometeorites
P. Fraundorf, K. D. McKeegan, R. I. Patel, S. A. Sandford, P. Swan, R. M. Walker
  1119

Raman Spectroscopy of Graphite and Other Phases in Meteorites and Interplanetary Dust
P. Fraundorf, R. I. Patel, R. M. Walker, J. J. Freeman, F. Adar
  1120

Chondrule Compositions in Different Type Chondrites
K. Fredriksson
  1121

Computer Simulation of Thermal History and Magmatic Differentiation of the Moon
M. Ya. Frenkel, A. A. Ariskin, A. A. Yaroshevsky
  1122

Cones and Domes in Arcadia
H. Frey, M. Jarosewich
  1123

Small Volcanoes in Cydonia: Variations in Morphometric Properties
H. Frey, M. Jarosewich, R. McDonald
  1124

The Solar Wind Record in Lunar Regolith Mineral Grains: Noble Gases and Nitrogen
U. Frick, R. O. Pepin
  1125

Measurement of 26AL in Apollo 15 Core 15008 and 22NA in Apollo 17 Rock 74275
J. S. Fruchter, J. C. Evans, J. H. Reeves, R. W. Perkins
  1126

Shape of Fe-Ni Grains and Strength among Ordinary Chondrites
N. Fujii, M. Miyamoto, Y. Kobayashi, K. Ito
  1127

Asteroid Spectral Variations: Implications for Composition and Surface Processes
M. J. Gaffey, T. V. V. King, B. R. Hawke, M. J. Cintala
  1128

A Model for Scale Dependence of Crater Collapse with Acoustic Fluidization
E. S. Gaffney
  1129

An Analytical Model for Simple Terrestrial Craters: Brent and Meteor
J. B. Garvin, R. A. F. Grieve
  1130

Magma Vesiculation and Pyroclastic Volcanism on Venus
J. B. Garvin, J. W. Head, L. Wilson
  1131

Magma Vesiculation in Apollo 15 Mare Basalts: Observations and Theory
J. B. Garvin, J. W. Head, L. Wilson
  1132

The Origin of Nonequilibrium Atmosphere at the Stage of the Earth's Accretion
M. V. Gerasimov, L. M. Mukhin, M. D. Nussinov
  1133

Development of Regoliths in Mars-Like Environments
E. K. Gibson, R. Bustin, S. Wentworth
  1134

Direct Analysis of Trapped Vapors and Fluids in Silicate Samples Utilizing the Laser Microprobe-Gas Chromatographic Technique
E. K. Gibson, R. K. Kotra, J. L. Warner
  1135

The North American Microtektite Layer: Two Events?
B. P. Glass, D. L. Dubois, R. Ganapathy
  1136

Is the Intrinsic Density of Venus Greater than the Intrinsic Density of Earth?
K. A. Goettel
  1137

Reflectance Radiometry of the Earth: Preliminary Results from the Shuttle Multispectral Infrared Radiometer
A. F. H. Goetz
  1138

Limits on the Expansion of Ganymede and the Thickness of the Lithosphere
M. P. Golombek
  1139

Oxygen Isotopic Compositions of Chondrules in Unequilibrated Chondrites: Further Petrological Interpretations
J. L. Gooding, T. K. Mayeda, R. N. Clayton, K. Keil, T. Fukuoka, R. A. Schmitt
  1140

Multiple Fall of Antarctic Meteorites: Results from Nuclear Track Studies
J. N. Goswami
  1141

Sulfur on Io: Laboratory Measurements of Spectral Properties
J. Gradie, S. Ostro, P. Thomas, J. Veverka
  1142

Carbon Isotopic Composition of Some Type 3 Ordinary Chondrites
M. M. Grady, P. K. Swart, C. T. Pillinger
  1143

Carbon Isotope Studies of Ureilites
M. M. Grady, P. K. Swart, I. P. Wright, C. T. Pillinger
  1144

Meteorites from the Asteroid Belt: Provenance and Providence
R. Greenberg, C. R. Chapman
  1145

Constraints on the Original Dimensions and Form of the Manicouagan Impact Structure
R. A. F. Grieve, J. W. Head
  1146

The Impact Cratering Process on Venus
R. A. F. Grieve, J. W. Head
  1147

Numerical Simulation of Crystal Fractionation in Shergottites
R. E. Grimm, H. Y. McSween, T. A. Callcott
  1148

The Abundance and Distribution of Moderately Volatile Elements in Semarkona Chondrules
J. N. Grossman
  1149

Some Regularities of the Areal Spreading of Fractures around Elgygytgyn Impact Crater
E. P. Gurov, E. P. Gurova
  1150

Dispersive Grain Flow
P. K. Haff
  1151

Central Pits in Martian Craters: Occurrence by Substrate, Ejecta Type and Rim Diameter
W. S. Hale
  1152

Central Peak and Peak Ring Development: Constraints from Lunar Peak Volumes
W. S. Hale, R. A. F. Grieve
  1153

On the Radial Structure of Planetary Rings
A. W. Harris, W. R. Ward
  1154

Experimental Impacts: Continued Study of Ejecta Velocities from Impacts Into Powdery Regoliths
W. K. Hartmann
  1155

Trace Element Analyses of Some North American Tektites
L. A. Haskin, M. Braverman, E. A. King
  1156

A Further Study of Compositional Variability in Lunar Anorthosite 60025
L. A. Haskin, M. M. Lindstrom, P. A. Salpas
  1157

Chemical Mixing Model Studies of the Orientale Basin Region
B. R. Hawke, T. L. Jackowski, P. D. Spudis, A. E. Metzger
  1158

The Origin of Selected Geochemical Anomalies on the Lunar Surface
B. R. Hawke, P. D. Spudis, P. E. Clark
  1159

The Chenier Crater Flows: Evidence for an Origin as Tsiolkovsky Impact Melt
B. R. Hawke, J. Whitford-Stark
  1160

Volcanic Processes on Venus
J. W. Head, L. Wilson
  1161

Tidal Origin of Europa's Fractures: a Refined Analysis
P. Helfenstein
  1162

1981 Va: a New Apollo Asteroid
E. F. Helin, R. S. Dunbar, J. G. Williams
  1163

Continental Thickness and Tectonic Style in the Early Archean
D. J. Henry, J. L. Boak, R. F. Dymek, J. L. Warner
  1164

On the Evolution of the Lunar Density Profile
F. Herbert
  1165

Waves in the Earth's Magnetosheath, the High Frequency Electromagnetic Response of the Moon and the Shallow (150-250 KM Depth) Lunar Electrical Conductivity Profile
F. Herbert, L. D. Smith, L. L. Hood, C. P. Sonett
  1166

Mechanisms of Heat and Mass Transfer in a Differentiating Earth
C. T. Herzberg
  1167

Origin of Mesosiderites during Asteroidal Accretion
R. H. Hewins
  1168

Barium from a Mini R-Process in Supernovae
D. Heymann
  1169

From Supernova to Meteorites
D. Heymann
  1170

Adsorption of Exospheric ARGON-40 in Lunar Regolith
R. R. Hodges
  1171

A Comparison of Scaling Laws for Planetary Impact Cratering: Experiments, Calculations, and Theory
K. A. Holsapple
  1172

On Inferring Lunar Internal Temperatures from Electrical Conductivity Determinations
L. L. Hood, F. Herbert, C. P. Sonett
  1173

Modal Petrology of Apollo 16 Surface Soils
K. J. Houck
  1174

Modal Petrology of Drive Tube Core 64002
K. J. Houck
  1175

The Irradiation Histories of Asteroidal Regoliths: a Monte Carlo Simulation
K. R. Housen, L. L. Wilkening
  1176

On the Interpretation of Magnetism in Allende Chondrules
R. M. Housley
  1177

On the Origin of Allende Chondrules and Mafic Inclusions
R. M. Housley, E. R. Cirlin
  1178

Thermal History and Lithospheric Thermal Stress for Ganymede and Callisto
P. Y. Huang, S. C. Solomon
  1179

244PU in the Early Solar System
B. Hudson, C. M. Hohenberg, B. M. Kennedy, F. A. Podosek
  1180

High Resolution Ion Microprobe Measurements of MG in Allende Plagioclase and Standard Glass
J. C. Huneke, J. T. Armstrong, H. F. Shaw, G. J. Wasserburg
  1181

The Magma Ocean as Viewed from the Fra Mauro Shoreline
R. H. Hunter, L. A. Taylor
  1182

Refractory Inclusions in the Adelaide Carbonaceous Chondrite
I. D. Hutcheon, I. M. Steele
  1183

Magnetite in Carbonaceous Chondrites
M. Hyman, M. W. Rowe
  1184

On Solar Wind Interaction with Asteroidal Objects
W.-H. Ip, F. Herbert
  1185

Has the Earth's Core Grown Over Geologic Times?
E. Jagoutz, H. Wanke
  1186

Subdivision of the Mg-Suite Plutonic Rocks Into Mg-Norites and Mg-Gabbronorites
O. B. James
  1187

Gravity Models of the Elysium Dome on Mars
P. Janle, J. Ropers
  1188

Effect of Impact Gardening on the Depth Distribution of Regolith Materials
J. H. Jensen, P. K. Haff
  1189

Decomposition of Ice by Incident Charged Particles: the Icy Satellites and Rings
R. E. Johnson, J. W. Boring, L. J. Lanzerotti, W. L. Brown
  1190

Gradient Acceleration as a Mechanism for Rapid Worldwide Dispersal of Particulates Following a Large-Body Impact
E. M. Jones, J. W. Kodis
  1191

An Experimental Geochemical Approach to Early Planetary Differentiation
J. H. Jones, M. J. Drake
  1192

Pu-Nd Dating: Progress Towards a "solar System" Pu/nd Ratio
D. T. Jost, K. Marti
  1193

Carbonaceous Chondrites from Antarctica
G. W. Kallemeyn, J. T. Wasson
  1194

Radiation History of Lunar Microbreccias and Lithic Chondrules from Weston Meteorite by Track Data
L. L. Kashkarov, L. I. Genaeva, L. S. Tarasov, G. V. Baryshnikova
  1195

Apollo 16 Anorthosites
M. J. Kempa, O. B. James
  1196

Apollo 16 Melt Rocks
M. J. Kempa, O. B. James
  1197

Isotopic Composition of c, h, N in Carbonaceous Chondrite Polymer Using Stepwise Combustion
J. F. Kerridge
  1198

X-Ray Single Crystal Diffraction Study of Clinopyroxene from Breccia Eucrite Vetluga
N. R. Khisina, L. V. Petushkova, A. Ya. Skripnik, A. G. Kuznetsov
  1199

On the Carbon to Oxygen Ratio in Solar Nebular Gases
I. L. Khodakovsky
  1200

Long Duration Exposure - Opportunities in the 1980'S
W. H. Kinard, J. L. Jones
  1201

Refractory Residues, Condensates and Chondrules from Solar Furnace Experiments
E. A. King
  1202

Surface Trapping of Noble Gases by Unirradiated and Irradiated Terrestrial Anorthite
C. Kirschbaum
  1203

Application of the Sphalerite Cosmobarometer to Group IAB Iron Meteorites
S. A. Kissin, H. P. Schwarcz
  1204

Viscous Flow Behavior of Four Iron-Containing Silicates with Alumina. Part 2. Effect of Oxidation Conditions
L. C. Klein, B. V. Fasano
  1205

Sorting of Dust Particles in the Protoplanet Cloud as the Cause of Forming Primary Zoned Cosmic Bodies of Various Compositions in the Solar System
G. G. Kochemasov
  1206

Efremovka Cai's: Composition and Origin of Rims
M. I. Korina, M. A. Nazarov, A. A. Ulyanov
  1207

Major and Trace Element Fractionations in Fine-Grained Cai's: Evidence for Igneous Differentiation during Melting Induced by Partial Distillation
A. S. Kornacki
  1208

Further Examination of the Geochemistry of Apollo 16 Soils
R. L. Korotev
  1209

Release of Volatiles from Martian Analog Materials
R. K. Kotra, E. K. Gibson, M. A. Urbancic
  1210

The Role of S in the Evolution of Iron Meteorite Parent Melts
A. Kracher, J. T. Wasson
  1211

Thermal Release of Trace Elements from 74001.1079.
U. Krahenbuhl, F. Wegmuller, H. R. von Gunten, J. Sorensen
  1212

A Search for Iridium Anomalies in Sediments Deposited during the Past 70 MA
F. T. Kyte, J. T. Wasson
  1213

Difference of Shock Pressure Recorded in Minerals of Shocked Rocks
P. Lambert
  1214

Impact Cratering in - and Ice-Silicate Targets: an Experimental Assessment
M. A. Lange, T. J. Ahrens
  1215

Impact Fragmentation of Ice-Silicate Bodies
M. A. Lange, T. J. Ahrens
  1216

Shock Induced Dehydration of Serpentine: First Quantitative Results and Implication for a Primary Planetary Atmosphere
M. A. Lange, T. J. Ahrens
  1217

Shock Release Adiabat Measurements on Volatile Bearing Minerals and Implications for an Impact Generated Atmosphere
M. A. Lange, T. J. Ahrens, J. M. Vizgirda
  1218

Chemical Study of the Apollo 14 14211/10 Core
J. C. Laul
  1219

Irradiation Effects at the Supernova Stage in Isotopic Anomalies
A. K. Lavrukhina, R. I. Kuznetsova
  1220

An Ice Dynamics Origin for the Martian Polar Laminated Terrains
J. H. J. Leach
  1221

The Development of Elongate Structures Within the Martian Polar Ice Caps
J. H. J. Leach
  1222

Lead and Strontium Isotope Studies of Basaltic Lavas from North America: Implications for Coupled Mantle and Crust Evolution
W. P. Leeman
  1223

Sputtering of Solid SO2 by High Energy Ions
D. J. Lepoire, B. H. Cooper, C. L. Melcher, T. A. Tombrello
  1224

A Two-Pyroxene Thermometer
D. H. Lindsley
  1225

Geochemical Studies of Feldspathic Fragmental Breccias 67015 and 67016
M. M. Lindstrom, P. A. Salpas
  1226

Chemical-Petrologic Characteristics and Origin of Gas-Rich H-Chondrites
M. E. Lipschutz, S. Biswas, H. Y. McSween
  1227

A Basis for Comparison of Rock, Glass and Orbital Data
K. J. Livi
  1228

Mineral Composition Trends and Cumulate Processes
J. Longhi
  1229

Modeling High Pressure Partial Melting of the Martian Mantle
J. Longhi
  1230

Martian Outflow Channels: Low Gradients and Ponded Flow
B. K. Lucchitta, H. M. Ferguson
  1231

Visible and Near Infrared Spectral Studies of the Aristarchus Region of the Moon
P. G. Lucey, B. R. Hawke, T. B. McCord, C. Pieters, J. W. Head
  1232

Chemistry of the Shergottites Elephant Moraine A79001 and Zagami
M.-S. Ma, J. C. Laul, M. R. Smith, R. A. Schmitt
  1233

Chemistry of the Matrix, the Glass Coating and an Olivine Clast from Polymict ANT Breccia 60035
M.-S. Ma, R. A. Schmitt
  1234

Time of Aqueous Activity on CI Parent Body
J. D. MacDougall, G. W. Lugmair, J. F. Kerridge
  1235

Electron Microscopy of Stratospheric Particles
I. D. R. MacKinnon, G. Nance, A. M. Isaacs, D. S. McKay
  1236

A Solar-Furnace Study of the Formation of Refractory Residues by Evaporation
G. J. MacPherson, I. Kawabe, L. Grossman, E. A. King
  1237

Dynamical Evolution of a Protosatellitary Disk
G. Magni
  1238

The Vaporization of Anorthositic Melt: Experimental Data
O. M. Markova, O. I. Yakovlev, K. I. Ignatenko
  1239

The Microstructures of Minerals in Coarse-Grained ca, Al-Rich Inclusions from the Allende Meteorite
P. M. Martin, D. J. Barber, I. D. Hutcheon
  1240

67015: a Kreepy Breccia from North Ray Crater
U. B. Marvin
  1241

The Shower of Cosmic Bodies Falls 65 M.Y. Ago?
V. L. Masaitis, M. S. Mashchak
  1242

Io's Atmosphere: Comparison of Models Involving Surface Frost, Cold Trapping, and Surface Venting
D. L. Matson, D. B. Nash
  1243

Statistical Analysis of Spatial Distribution of Craters
T. Matsui, M. Nakamura, Y. Abe, I. Yasuda
  1244

Phenomena Associated with Low-Velocity (10--300 M/sec) Impact against Rock
T. Matsui, T. Waza, K. Kani, S. Suzuki
  1245

Orientations of Structural Features in the Lunae Palus - Coprates Region of Mars: Influence of Pre-Existing Structure
T. A. Maxwell
  1246

A Model for Core Segregation Within the Earth
C. A. McCammon, A. E. Ringwood, I. Jackson
  1247

Phase Diagram of the System Fe-Feo at High Pressure
C. A. McCammon, A. E. Ringwood, I. Jackson
  1248

Thermodynamics of the System Feo-Mgo at High Pressure
C. A. McCammon, A. E. Ringwood, I. Jackson
  1249

Spectral Unit Maps of Europa
T. B. McCord, R. N. Clark, A. Meloy, M. Nelson, T. V. Johnson, D. Matson, J. A. Mosher
  1250

Kinematics of Basin Subsidence, Grabens, and Lunar Expansion
G. E. McGill, M. P. Golombek
  1251

Chemical Composition of Agglutinates by SEM and Edxa
D. S. McKay, A. Basu
  1252

Petrology of Lunar Core 15007/8
D. S. McKay, A. Basu
  1253

Partitioning of REE Between Olivine, Plagioclase, and Synthetic Basaltic Melts: Implications for the Origin of Lunar Anorthosites
G. A. McKay
  1254

Geologic History of the Apollo 16 Region
J. P. McKinley, G. J. Taylor, K. Keil
  1255

Apollo 16 Impact Melt Sheets
J. P. McKinley, G. J. Taylor, K. Keil, M.-S. Ma, R. A. Schmitt
  1256

Problems Pertaining to the Internal Structures of Ganymede and Callisto
W. B. McKinnon
  1257

Deuterium Enrichments in Primitive Meteorites
N. J. McNaughton, J. Borthwick, A. E. Fallick, C. T. Pillinger
  1258

Petrogenesis of the Elephant Moraine A79001 Achondrite
H. Y. McSween, E. Jarosewich
  1259

Evidence of a Metamorphic Origin for Melilite in Allende CAI
G. P. Meeker, J. T. Armstrong, G. J. Wasserburg
  1260

The Stage of Plate Tectonics in the Evolution of Terrestrial Planets
R. Meissner
  1261

Measurement of Xenon Diffusion Following Ion Implantation Into Olivine
C. L. Melcher, D. S. Burnett, T. A. Tombrello
  1262

The Rheology of Acoustically Fluidized Debris: Experiments and Application to Crater Slumping
H. J. Melosh, P. Goetz
  1263

Band Quantification in Reflectance Spectroscopy
W. W. Mendell, R. V. Morris
  1264

Charged Dust in the Saturnian Magnetosphere
D. A. Mendis, J. R. Hill, H. L. F. Houpis
  1265

Dense, but Collisionless Orbiting Rings
F. C. Michel
  1266

Tsarev Meteorite: the New Shock-Metamorphized Chondrite
L. F. Migdisova, N. I. Zaslavskaya, A. V. Ivanov, V. I. Grokhovsky, S. M. Kirov
  1267

Meteors from Giordano Bruno Ejecta
S. S. Mims, R. W. James
  1268

Crater Frequencies on Ganymede and Their Implications
S. S. Mims, D. Nummedal
  1269

A New Indicator of Formation Process Based on Bulk an and or Contents of Terrestrial and Extraterrestrial Plagioclases with and Without Exsolution Textures
Y. Miura
  1270

Compositional Variations of Plagioclase, Whitlockite, Apatite and Chromite in YAMATO-75135,93 Chondrite
Y. Miura
  1271

Reduction of the Effects of Black Materials from the Spectral Reflectance of Meteorites
M. Miyamoto, A. Mito, H. Takeda
  1272

Cratering Experiments in Sand
H. Mizutani, S. Kawakami, Y. Takagi, M. Kato, M. Kumazawa
  1273

Low Velocity Impact Experiments on Ice and Basalt
H. Mizutani, S. Kawakami, Y. Takagi, M. Kato, M. Kumazawa
  1274

A Case for a Weak Crust on Venus
H. Mizutani, H. Spetzler
  1275

BERYLLIUM-10 Contents of Stony Meteorites and the NEON-21 Production Rate
R. K. Moniot, T. H. Kruse, W. Savin, C. Tuniz, T. Milazzo, G. S. Hall, D. Pal, G. F. Herzog
  1276

Tectonic and Geological History of Tethys
J. M. Moore, J. L. Ahern
  1277

Comparison of Orthopyroxenes in Lunar Norites and Diogenites
H. Mori, H. Takeda, M. Miyamoto
  1278

Reflectance Spectroscopy of Structural States Formed by the Dehydration of Goethite Alpha-Feooh
R. V. Morris, H. V. Lauer
  1279

Stratigraphy of Core 12027 and Section 64002 OF Core 64001/2: Feo and Is/feo Depth Profiles
R. V. Morris, H. V. Lauer
  1280

Stratigraphy of the Apennine Front Core 15007/8
R. V. Morris, H. V. Lauer
  1281

Optical Properties of Hematite-Magnetite Mixtures: Implications for Mars
R. V. Morris, S. C. Neely
  1282

The Mulcahy Lake Layered Norite
D. A. Morrison, L. D. Ashwal, D. J. Henry, D. E. MacZuga, W. C. Phinney
  1283

Adcumulus Growth at the Base of the Lunar Crust
S. A. Morse
  1284

Lava Flows as Slope Indicators in the Tharsis Region of Mars
P. J. Mouginis-Mark
  1285

Experimental Studies on Spinel, Melilite and Anorthite and Their Possible Relevance to Ca-Al Inclusions from Meteorites
W. F. Muller, U. Hornemann, R.-J. John, H. Kroll, H. Schafer
  1286

Mineralogical Study of the Leoville Meteorite (CV3): Macroscopic Texture and Transmission Electron Microscopic Observations
W. F. Muller, F. Wlotzka
  1287

Actinide Chemistry in Chondrites
M. T. Murrell, D. S. Burnett
  1288

Genetic Relation of Chondrules, Inclusions and Isolated Olivines in ALH-77307 (CO3) Chondrite
H. Nagahara, I. Kushiro
  1289

High Magnetic Coercivity of Meteorites Containing the Ordered Feni (tetrataenite) as the Major Ferromagnetic Constituent
T. Nagata
  1290

Depositional Units in Drive Tube 64002/1
J. S. Nagle
  1291

Evidence of Subcrater Lithification and Hot Ejecta Deposition in Lunar Polymict Regolith Breccias and Achondrites
J. S. Nagle
  1292

Experimental Simulation of Regolith Depositional Features
J. S. Nagle
  1293

Petrographic Evidence of Processes in Subcrater Lithification
J. S. Nagle
  1294

Textural and Structural Evidence of Regolithic and Non-Regolithic Processes in Chondrites
J. S. Nagle
  1295

Apollo Lunar Seismic Experiment - Final Summary
Y. Nakamura
  1296

Irradiation History of Antarctic Gas-Rich Meteorites
C. M. Nautiyal, J. T. Padia, M. N. Rao, T. R. Venkatesan, J. N. Goswami
  1297

Extraterrestrial Event at the CT Boundary: New Geochemical and Mineralogical Data
M. A. Nazarov, L. D. Barsukova, G. M. Kolesov, D. P. Naidin, A. S. Alekseev
  1298

Source of Errors in Defocussed Beam Analysis with the Electron Probe, Revisited
M. A. Nazarov, K. I. Ignatenko, I. D. Shevaleevsky
  1299

Efremovka Cais: Major and Trace Element Chemistry
M. A. Nazarov, A. A. Ulyanov, M. I. Korina, G. M. Kolesov
  1300

The Tucson Iron and the Aubrites
C. E. Nehru, M. Prinz, J. S. Delaney
  1301

Ancient Cratering Records of the Terrestrial-Type Planets
G. Neukum
  1302

Ancient Lunar Impact Record
G. Neukum, D. E. Wilhelms
  1303

Partitioning of Phosphorus Between Metal and Silicate: Implications for the Moon and Eucrite Parent Body
H. E. Newsom, M. J. Drake
  1304

Measurements of 53MN in Deep Sea Stony Spherules
K. Nishiizumi, J. R. Arnold
  1305

Measurements of Cosmic Ray Produced 53MN and 10BE in Lunar Cores
K. Nishiizumi, J. R. Arnold, D. Elmore, L. E. Tubbs, G. Cole, D. Newman
  1306

Comparative Thermal and Mechanical Histories of Clasts in Breccia 62236
G. L. Nord, M.-V. Wandless
  1307

Laboratory Studies of the Condensation and Properties of Amorphous Silicate Smokes
J. A. Nuth, B. Donn
  1308

Do Oblique Impacts Produce Martian Meteorites?
L. E. Nyquist
  1309

The Effect of the Atmosphere on Large-Scale Impacts -- Extinction Mechanisms and the Origin of Tektites
J. D. O'Keefe, T. J. Ahrens
  1310

Generation and Transport of Impact Melt
D. L. Orphal, W. F. Borden, S. A. Larson, P. H. Schultz
  1311

Annealing Behaviour of Diaplectic Plagioclase Glass
R. Ostertag
  1312

Can Metal Segregation Remove Siderophiles from Lunar Impact Melts?
H. Palme, B. Spettel, H. Wanke, R. Borchardt, D. Stoffler
  1313

Nature of the Regolith on Callisto and Ganymede: Inference from Voyager Photometry
K. D. Pang, K. Lumme, E. Bowell, J. M. Ajello
  1314

Chemical and Isotopic Study of Deep Sea Spherules
D. A. Papanastassiou, D. E. Brownlee, G. J. Wasserburg
  1315

Emplacement of Bright Terrain on Ganymede in Response to Lithospheric Extension
E. M. Parmentier, J. W. Head
  1316

Ganymede Tectonics: Progressive Lithospheric Fragmentation due to Planetary Expansion
E. M. Parmentier, M. T. Zuber
  1317

Early Thermal Histories of Ganymede and Callisto
Q. R. Passey, E. M. Shoemaker
  1318

Experimental Phase Relations of Model Martian Mantle Compositions
E. S. Patera, J. R. Holloway
  1319

Primary Ejecta in Crater Rays: the Copernicus Example
C. M. Pieters, J. B. Adams, J. W. Head, T. B. McCord, S. H. Zisk
  1320

Basic Reflectance Experiments: Scattering, Absorption Particle Size, etc.
C. M. Pieters, D. Sandlin, C. Wells, T. V. V. King
  1321

Morphologic Transitions for Craters and Basins on 13 Solar System Bodies
R. J. Pike
  1322

Cosmogenic 22NA and 26AL in Luna 24 Drill Core Soil Samples
P. Povinec, A. K. Lavrukhina, G. K. Ustinova
  1323

Reckling Peak A79015: an Unusual Mesosiderite
M. Prinz, C. E. Nehru, J. S. Delaney
  1324

Silicate Inclusions in Irons and Metal-Silicate Assemblages
M. Prinz, C. E. Nehru, J. S. Delaney
  1325

Sombrerete: an Iron with Highly Fractionated Amphibole-Bearing Na-P Silicate Inclusions
M. Prinz, C. E. Nehru, J. S. Delaney
  1326

Composition and Microstructure Features of Chilled Impact Glasses from Astroblemes on the U.S.S.R. Territory
A. I. Raikhlin, A. N. Danilin, V. A. Maslov
  1327

New Evidence of RELICT Grains in Chondrules of Highly Unequilibrated Ordinary Chondrites
E. R. Rambaldi
  1328

Long-Term Solar Wind Activity as Inferred from Lunar Regolith Samples
J. Ray, D. Heymann
  1329

Spallogenic Production Rates in Interstellar Grains
J. Ray, H. J. Volk
  1330

A Comparative Study on the Mineralogy, Chemistry, and Chronology of the Apollo 16 Crystalline Impact Melt Breccias. Part II: Chronology
W. U. Reimold, B. M. Bansal, H. Wiesmann, J. L. Wooden, I. D. R. MacKinnon, L. E. Nyquist
  1331

A Comparative Study on the Mineralogy, Chemistry, and Chronology of the Apollo 16 Crystalline Impact Melt Breccias. Part i: Chemistry and Modal Composition
W. U. Reimold, J. N. Reimold, L. E. Nyquist, D. Stoffler
  1332

Homogeneity of Lava Flows: Trace Element Data for Historic Mauna Loan Lavas
J. M. Rhodes
  1333

Solute Banding: Manifestations in Solidifying Lunar Magma Oceans
A. Rice
  1334

Mutual Solubilities of Molten Transition Metals and Oxides
A. E. Ringwood, A. Major
  1335

New Evidence for the Impact Origin of Kilmichael Mississippi
P. B. Robertson, M. D. Butler
  1336

Global Features of Craters' Distribution on the Moon, Mars, and Mercury
Zh. F. Rodionova, K. I. Dekhtyareva, T. P. Skobeleva, D. A. Kazimirov, B. D. Sitnikov
  1337

Distributions of Trace Elements in the Extreme Differentiates of the Fongen-Hyllingen Layered Complex: a Possible KREEP Analog
P. S. Rosener, P. H. Warren, K. H. Esbensen, J. R. Wilson
  1338

The Temperature and Pressure Dependence of Silicon Diffusion in a Sodium Alumino-Silicate Melt
A. Ross
  1339

Effects of Iron-Silica Gels on Spectral Reflectance
T. L. Roush
  1340

Microchondrules: Their Occurrence in New Kinds of Type 3 Chondrites and Their Bearing on the Origin of Chondrules
A. E. Rubin, E. R. D. Scott, K. Keil, A. Okada
  1341

The Interpretation of Lunar Palaeomagnetic Directions
S. K. Runcorn
  1342

Experimental Study of Silicate-Sulfide Metal Equilibria in Basalts
M. J. Rutherford, M. Carroll, A. Borthwick
  1343

Apollo 17 Ol-Plag Vitrophyres, 76035, and the Serenitatis Melt Sheet: another Brick in the Wall
G. Ryder
  1344

Ferroan Anorthosite 60025, Adcumulate Growth, and Bulk Moon Considerations
G. Ryder
  1345

Chemistry of Apollo 16 Impact Melts: Numerous Melt Sheets, Lunar Cratering History, and the Cayley-Descartes Distinction
G. Ryder, R. Seymour
  1346

Landsat-D and Earth Exploration
V. V. Salomonson
  1347

A Preliminary Compositional Study of Anorthosites from the Stillwater Intrusion
P. A. Salpas, L. A. Haskin
  1348

A Preliminary Study of Trace Elements in Anorthosites from the Etagaulet Massif
P. A. Salpas, L. A. Haskin
  1349

Diaplectic Quartz from Autogenous Breccia of the Puchezh-Katunk Astrobleme (ussr)
L. V. Sazonova, A. A. Nosova, V. I. Feldman, M. V. Lomonosow
  1350

Venus Pioneer: Ratios and Composite Maps of Altimetry, RMS Slopes and the Fresnel Reflection Coefficient
G. G. Schaber, R. C. Kozak, P. Davis, E. Eliason
  1351

Ages of Serenitatis Breccias
O. A. Schaeffer, R. Warasila, T. C. Labotka
  1352

Dynamic Scaling Relationships for Impact Crater Formation
R. M. Schmidt
  1353

High Spatial Resolution Mg/al Ratios of Central Highlands, Apollo 16 Site, and the NE Langrenus Region
E. Schonfeld
  1354

Organic Chemistry on Europa?
E. Schonfeld
  1355

Vanadium as an Oxygen Geobarometer in Basaltic Magmas: the Further Development of a Geochemical Electromotive Force Series in Silicate Melts
H. D. Schreiber, G. B. Balazs
  1356

Atmospheric Effects on Impact Cratering Efficiency
P. H. Schultz
  1357

Impact Ejecta Dynamics in an Atmosphere: Experimental Results
P. H. Schultz, D. E. Gault
  1358

Forgotten Satellites of Mars: a Possible Record from Oblique-Angle Impacts
P. H. Schultz, A. B. Lutz-Garihan
  1359

Impact-Basin Control of Channels and Valleys on Mars
P. H. Schultz, J. L. Rogers, R. A. Schultz
  1360

Stratigraphy and Age Relations in the Tharsis-Lunae Planum Region of Mars
D. H. Scott
  1361

Origins of Ordinary and Carbonaceous Type 3 Chondrites and Their Components
E. R. D. Scott, G. J. Taylor, K. Keil
  1362

Large Glassy Objects from the Apollo 16 Landing Site
T. H. See, F. Horz, D. Blanchard
  1363

Investigation of the Extractable Organic Constituents of the Kainsaz Carbonaceous Chondrite
L. F. Semjonova, A. V. Karyakin, A. V. Fisenko, T. S. Sorokina, N. F. Efimova, A. K. Lavrukhina
  1364

Liquidus Relations in the Forsterite-Silica System at 1 ATM
R. Sessler, P. C. Hess, M. J. Rutherford
  1365

Recent Advances in Geological Remote Sensing of the Earth
M. Settle, J. V. Taranik
  1366

Mare Ridge Morphology at Structural and Stratigraphic Boundaries: Implications for Determining Age Sequence
V. L. Sharpton, J. W. Head
  1367

Sm-Nd and Rb-Sr Systematics and the Origin of Sanidine Spherules from a Cretaceous-Tertiary Boundary Clay
H. F. Shaw, G. J. Wasserburg
  1368

Trace Element Data on Enstatite Chondrite Components and the Qingzhen Enstatite Chondrite
Z. Sheng, W. Sallee, D. W. G. Sears
  1369

Non-Stoichiometric Maghemite on Mars
D. M. Sherman
  1370

NI Isotopic Compositions in Terrestrial and Meteoritic Samples
T. Shimamura, G. W. Lugmair
  1371

A Partially Molten Magma Ocean Model
D. N. Shirley
  1372

Investigation of xe Isotopic Composition with Differential Dissolutions and Stepwise Heating Experiments of the Matter Tzariov L 5,6 Chondrite
Iu. A. Shukoliukov, D. V. Minh, A. K. Lavrukhina, A. V. Fisenko, L. F. Semjonova, V. I. Simonovski, M. M. Fugzan, L. N. Melnikova
  1373

244PU Fission xe in the Chervony Kut and Vetluga Achondrites
Yu. A. Shukolyukov, D. V. Minh, A. Ya. Scripnik
  1374

Comparative Investigations on Isotopic Composition of the Kaydun Meteorite and Other Carbonaceous Chondrites
Yu. A. Shukolyukov, D. V. Minh, V. I. Simonovsky, M. M. Fugzan
  1375

On the Characteristics of xe Isotopic Composition from the l4 Saratov and the l5 Elenovka Chondrite
Yu. A. Shukolyukov, D. V. Minh, V. I. Simonovsky, M. M. Fugzan
  1376

Investigation on Isotopic Composition of Noble Gases in the Tsarev Meteorite
Y. A. Shukolyukov, D. V. Minh, V. I. Simonovsky, M. M. Fugzan, L. F. Migdisova, N. I. Zaslavskay
  1377

Isotopic Composition of xe and KR in Material of the White Inclusions from the Efremovka Carbonaceous Chondrite (C3V)
Yu. A. Shukolyukov, D. V. Minh, V. I. Simonovsky, M. M. Fugzan, M. A. Nazarov, M. I. Korina
  1378

Petrology of Antarctic Polymict Eucrite EETA79006
S. B. Simon, M. Fuhrman, J. J. Papike
  1379

Petrology of the Apollo 14 Regolith
S. B. Simon, J. J. Papike
  1380

Possible Asteroidal Origin of SNC Meteorites
A. V. Singer, H. J. Melosh
  1381

Mafic Rock Clasts Found in the Howardite, Kapoeta: a Chemical Study
M. R. Smith, R. A. Schmitt
  1382

Heat Transport in H2O-ICE Cometary Nuclei
R. Smoluchowski
  1383

Viscous Relaxation of Lunar Basin Topography: Evidence for Hemispherical Asymmetry in Pre-Nectarian Crustal Temperature
S. C. Solomon, R. P. Comer, J. W. Head
  1384

Mechanisms for Lithospheric Heat Transfer on Venus: Implications for Tectonic Style and Volcanism
S. C. Solomon, J. W. Head
  1385

Viscous Relaxation of Impact Basin Topography on Venus
S. C. Solomon, S. K. Stephens, J. W. Head
  1386

Mechanism for Metamorphism-Induced TL Changes in Uoc: Evidence from Separated Dhajala Chondrules
M. H. Sparks, D. W. G. Sears
  1387

Cosmic-Ray COBALT-60 in Chondrites
M. S. Spergel, R. C. Reedy, O. W. Lazareth, P. W. Levy
  1388

Crustal Strength of the Terrestrial Planets
H. Spetzler, M. Mizutani, I. C. Getting
  1389

Orientale Basin Ejecta: Depths of Derivation and Implications for the Basin-Forming Process
P. D. Spudis
  1390

The Tectonics of Enceladus
S. W. Squyres, R. T. Reynolds, P. M. Cassen, S. J. Peale
  1391

Mineralogy of Elephant Moraine EETA 79001 Two-Component Achondrite with Resemblances to Shergotty
I. M. Steele, J. V. Smith
  1392

Trace Elements in Plagioclase from Banded Zone of Stillwater: Variation with Stratigraphy and NA Content of Plagioclase
I. M. Steele, J. V. Smith
  1393

Migration of Fluid-Filled Cracks: Applications to Terrestrial and Icy Bodies
D. J. Stevenson
  1394

Structure of the Giant Planets: Evidence for Nucleated Instabilities and Post-Formational Accretion
D. J. Stevenson
  1395

The Influence of Oxygen Fugacity and Cooling Rate on the Crystallization of Ca-Al Inclusions from Allende
E. Stolper, J. Paque, G. R. Rossman
  1396

Ferromagnetic Resonance as a Determinant for Origin of Lunar Glass Beads
C. D. Stone, L. A. Taylor
  1397

Lunar Glass Beads: a Comparison of SEM, Fmr(is), and Compositional Features
C. D. Stone, L. A. Taylor
  1398

Trace Element and REE Analyses from the Bishopville and Norton County Enstatite Achondrites
M. M. Strait
  1399

Eolian Stratigraphy of the West Central Equatorial Region of Mars
E. L. Strickland
  1400

Solar System Cratering Populations
R. G. Strom, A. Woronow
  1401

Magnetic Properties of Primitive Non-Carbonaceous Chondrites
N. Sugiura, D. W. Strangway
  1402

Prediction of Time and Environment-Dependent Strength: Fracture Mechanics Applied to Crustal Rocks
P. L. Swanson, H. Spetzler
  1403

Step-Wise Carbon Isotopic Analyses of the Allende Meteorite
P. K. Swart, M. M. Grady, C. T. Pillinger
  1404

Antarctic Ureilites, and Some Hypotheses for Their Origin and Evolution
H. Takeda
  1405

Three Different Basalt Types in Antarctic Polymict Eucrites, a View from Pyroxene Chemical Zoning Trends
H. Takeda, H. Mori, K. Yanai, J. L. Wooden
  1406

Amino Acid Contents and Irradiation Histories of Two Carbonaceous Chondrites
A. S. Tamhane, R. S. Rajan
  1407

Identification of Armalcolite in the Rocks of Ukraine (ussr)
V. I. Tatarintsev, S. N. Tsymbal, G. V. Legkova
  1408

A Possibly Pristine, Ferroan Anorthosite
G. J. Taylor
  1409

Structure and Fragmentation of the Parent Asteroids of Ordinary Chondrites
G. J. Taylor, E. R. D. Scott, A. E. Rubin, P. Maggiore, K. Keil
  1410

Isotopic Subtleties in Galenas' PB -- Implications to Terrestrial Magma Sources and Early Crust
F. Tera
  1411

An Unusual - and O-Rich Layered Material in Chondrules and Aggregates of Carbonaceous Chondrites
K. Tomeoka, P. R. Buseck
  1412

Planetary Formation Sites
M. Torbett, R. Smoluchowski, R. Greenberg
  1413

Crater Degradation Variations in the Martian Cratered Terrain
J. Trimble
  1414

Thermal Stresses in Planetary Elastic Lithospheres
D. L. Turcotte
  1415

Ca-Al Inclusions: Condensation or Evaporation?
A. A. Ulyanov
  1416

Efremovka Cai's: Mineralogical and Petrological Data
A. A. Ulyanova, M. I. Korina, M. A. Nazarov, E. Ya. Sherbovsky
  1417

Hafnium and Neodymium Isotopic Constraints on Mare Basalt Genesis
D. M. Unruh, P. Stille, P. J. Patchett, M. Tatsumoto
  1418

Solar Proton Effects in the Bruderheim Chondrite
A. K. Ustinov, A. K. Lavrukhina
  1419

Shock Metamorphism of Quartz and Estimation of Masses Motion in the Bases of Boltysh and Ilyinets Astroblemes of the Ukranian Shield
A. A. Valter, Yu. P. Dobryansky, E. E. Lasarenko, V. K. Tarasyuk
  1420

Scr-Proton Produced Xenon Isotopes in Lunar Rocks
T. R. Venkatesan, C. M. Nautiyal, J. T. Padia, M. N. Rao
  1421

How much s8 (cyclooctasulfur) is There on the Surface of Io?
J. Veverka, J. Gradie, P. Thomas, S. J. Ostro
  1422

Origin of Trapped Noble Gas Components in Abee
J. F. Wacker, K. Marti
  1423

The Size Distribution of Clasts in the Abee E-Chondrite and Other Meteorite Breccias
J. F. Wacker, L. L. Wilkening
  1424

Distal Lobes of Lava Flows as Indicators of Magma Rheology on Olympus Mons and Earth
G. Wadge
  1425

Tidal Barriers in the Solar Nebula
W. R. Ward
  1426

The Paradoxical Metal Compositions in LEO-1, a Type b1 Ca-Al Rich Inclusion from Leoville
D. A. Wark, F. Wlotzka
  1427

Venus: Model for Exchange Between Crust and Mantle
J. L. Warner
  1428

The Moon is not Necessarily Enriched in Refractory Elements
P. H. Warren
  1429

Graphic Granite from the Moon
P. H. Warren, G. J. Taylor, K. Keil, G. W. Kallemeyn
  1430

Foraging for Pristine Nonmare Rocks: Four More from the West
P. H. Warren, G. J. Taylor, K. Keil, G. W. Kallemeyn, P. S. Rosener, J. T. Wasson
  1431

Magnetic Characterization of Tetrataenite and its Role in the Magnetization of Meteorites
P. J. Wasilewski
  1432

Enhanced Ion-Erosion of Planetary Surfaces
C. C. Watson, T. A. Tombrello
  1433

Evidence for Volatilization Resulting from Solar Heating of the Lunar Surface
F. Wegmuller, U. Krahenbuhl, U. von Gunten, H. R. von Gunten
  1434

The Effect of Country Rocks and Tectonics on Variations of Plagioclase-Mafic Mineral Compositions in Layered Intrusions
P. W. Weiblen, J. D. Miller
  1435

Coagulation and Settling of Dust in Giant Gaseous Protoplanets
S. J. Weidenschilling
  1436

Silicate Weathering and Diagenesis in an Antarctic Soil-Mars Analog
S. J. Wentworth, D. S. McKay
  1437

Gravitational Cross Sections and "runaway Accretion"
G. W. Wetherill, L. P. Cox
  1438

Gravitational Effects on Caldera Formation
J. L. Whitford-Stark
  1439

The Mountains of IO
J. L. Whitford-Stark
  1440

Geologic Studies of the Lunar Far Side Crater Tsiolkovsky
J. L. Whitford-Stark, B. R. Hawke
  1441

The Hico Structure: a Possible Impact Structure in North-Central Texas, USA
L. Wiberg
  1442

Trapped Solar Flare NE in Lunar Soil Plagioclases: Secular Decrease of the Solar Flare/solar Wind Flux Ratio
R. Wieler, Ph. Etique, P. Signer
  1443

The Effects of p, c, and S on Trace Element Partitioning during Solidification in the Fe-Ni System
J. Willis, J. I. Goldstein
  1444

The Significance of Zeolites and Other Hydrous Alteration Products in Leoville Ca-Al Inclusions
F. Wlotzka, D. A. Wark
  1445

Theoretical Prediction of Phase Relationships in Planetary Mantles
B. J. Wood, J. R. Holloway
  1446

Fall Statistics of H Chondrites: Evidence of Cometary Origins for Ordinary Chondrites
C. A. Wood
  1447

Pingos, Gervigigars and Martian Mysteries
C. A. Wood
  1448

Comets, Asteroids, Meteorites, and Meteors: a New Paradigm of Interrelations
C. A. Wood, W. W. Mendell
  1449

Rb-Sr and Sm-Nd Isotopic Constraints on the Origin of EETA 79001: a Second Antarctic Shergottite
J. Wooden, C.-Y. Shih, L. Nyquist, B. Bansal, H. Wiesmann, G. McKay
  1450

Theoretical Crater-Density Asymmetries on Ganymede and Callisto
A. Woronow
  1451

Compositional Alteration Produced in Lunar Metamorphic Rocks: Experimental Model of the Condensation Process
O. I. Yakovlev, G. M. Kolesov, I. A. Roshina, E. J. Sherbovsky
  1452

The Concentration and Isotopic Composition of Hydrogen and Carbon in Meteorites
J. Yang, S. Epstein
  1453

Chemical Rock Types, Crystallization Sequence and Possible Types of Primary Melts of Mare Crisium
A. A. Yaroshevsky, A. A. Ariskin, L. S. Tarasov, M. Ya. Frenkel, A. F. Kudryashova
  1454

Surface Properties of Ancient Cratered Terrain in the Northern Hemisphere of Mars
J. R. Zimbelman, R. Greeley
  1455

Simulation Experiments for the Chemical and Isotopic Measurements of Interplanetary Dust on LDEF
E. Zinner, H. Kuczera, N. Pailer
  1456

Dust Particles in the Jovian System
H. A. Zook, S.-Y. Su
  1457

A Geometric Analysis of the Ganymede Furrow System: a Test for Lateral Motion of Dark Terrain
M. T. Zuber
  1458