Eighteenth Lunar and Planetary Science Conference

		no.

Evolution of an Impact-Generated H2O-CO2 Atmosphere and Formation of a Hot Proto-Ocean on Earth Y. Abe, T. Matsui		1001

Lunar Volatiles: More Than Meets the Eye? W. N. Agosto		1002

P-Fe deg Systematics as an Indicator of Genetic Environment in the Basaltic Achondrite Group W. N. Agosto		1003

Mossbauer Study of Ultramicrocrystalline Hematite D. G. Agresti, J. A. Newcomb, R. V. Morris		1004

Loss of the Earth's Atmosphere From Giant Impacts T. J. Ahrens, D. O'Keefe		1005

The Comet Nucleus Sample Return Mission T. J. Ahrens		1006

SEMPA--A Scanning Electron Microscope and Particle Analyzer for the CRAF Mission A. L. Albee, J. G. Bradley		1007

Statistics of Meteorite Falls V. A. Alexeev		1008

Spallogenic Mn-53 in Some Meteorites V. A. Alexeev, V. V. Malishev, A. K. Lavrukhina		1009

Microscopic Lamellar Deformation Features in Quartz From Different Geologic Environments J. S. Alexopoulos, R. A. F. Grieve, P. B. Robertson		1010

Melting in the Fe-FeS System and its Relation to the Compositions of the Cores of Earth and Mars W. W. Anderson, T. J. Ahrens, B. Svendsen		1011

Melting of Iron Sulfide and Iron Oxide at High Pressure W. W. Anderson, A. J. Campbell, T. J. Ahrens		1012

Cretaceous-Tertiary Event: Noble Gases in Turkmenia K/T Boundary Sediments G. S. Anufriev, B. S. Boltenkov, I. N. Kapitonov, L. V. Usacheva, L. D. Barsukova, M. A. Nazarov		1013

Absorption Spectra and Bulk Chemical Compositions of Achondritic Polymict Breccias With Reference to Characterization of the Surface of Vesta-Like Asteroids T. Aoyama, T. Hiroi, M. Miyamoto, H. Takeda		1014

Ice at the Lunar Poles Revisited J. R. Arnold		1015

Mixing Patterns in Viking Orbiter Color Image Data for the Equatorial Region of Mars R. E. Arvidson, M. A. Dale-Bannister		1016

Simulation of Venera and Magellan Radar Images From SEASAT Data R. E. Arvidson, C. Elachi, R. Kwok, J. Curlander, R. S. Saunders		1017

Types and Characteristics of Terrestrial Anorthosites L. D. Ashwal, K. Burke		1018

The Significance of Block Size and Pit Diameter in Rocks at the Viking Lander Sites, Mars J. C. Aubele, L. S. Crumpler		1019

Quartz Grains With Planar Features in the Triassic-Jurassic Boundary Sediments From Northern Limestone Alps, Austria D. D. Badjukov, H. Lobitzer, M. A. Nazarov		1020

The K/T Event: Amount of the Crater Ejecta and the Possible Impact Site D. D. Badjukov, M. A. Nazarov, A. S. Alekseev		1021

Profiles of Lava Flows at Alba Patera, Mars S. M. Baloga, D. C. Pieri, J. Plescia, P. Davis		1022

A Revised Martian Relative Age Chronology and Some Geologic Implications N. G. Barlow		1023

Chondrules in the Kainsaz CO Chondrite: Mineral Composition and Assemblages; Comparison With the Allende CV and Ordinary Chondrite Chondrules G. V. Baryshnikova, S. A. Stakheeva, Z. A. Lavrentjeva, K. I. Ignatenko, A. K. Lavrukhina		1024

Petrologic Observations on the Apollo 15 Drill Core 15007/8 A. Basu, D. S. McKay		1025

Monomineralic Fragments in the 90-150 Micron Fraction of Soils in the Apollo 15 Drill Core Sections 15007/8 From Station 2 A. Basu, T. Gerke, D. S. McKay		1026

Heavy Nitrogen in the Bells Carbonaceous Chondrite R. H. Becker		1027

Constraints on the Origin of Eucritic Melts: an Experimental Study J. R. Beckett, E. Stolper		1028

The Stability of Hibonite in Silicate Melts: Implications for the Origin of Hibonite-Bearing Inclusions From Carbonaceous Chondrites J. R. Beckett, E. Stolper		1029

Spectral Alteration Effects in Chondrites Gas-Rich Breccias: Implications for S-Class and Q-Class Asteroids J. F. Bell III, K. Keil		1030

Planetary Collision Calculations: Origin of the Moon W. Benz, A. G. W. Cameron, W. L. Slattery		1031

Petrology and Compositional Trends in Five New Antarctic Diogenites J. L. Berkley		1032

Isotopic Fractionation of KR and Xe Implanted in Solids at Very Low Energies T. J. Bernatowicz, B. E. Hagee, A. J. Fahey		1033

15445 and 15455: Results of 39Ar-40Ar Age Dating M. L. Bernstein		1034

Partial Melting of an Anhydrous Martian Mantle C. M. Bertka, J. R. Holloway		1035

The Comet Experiment: First Results J. P. Bibring, Y. A. Surkhov, J. Borg, Y. Langevin, P. Salvetat, B. Vassent		1036

Venus Topography: A Reappraisal B. G. Bills, M. Kobrick		1037

The Parquet Terrain of Venus: Geology and Surface Properties of Tellus Regio D. L. Bindschadler, J. W. Head		1038

Tectonic Features Due to Gravitational Relaxation of Topography D. L. Bindschadler, E. M. Parmentier		1039

The Koronis Family: Possible Evidence for a Recent Catastrophic Disruption R. P. Binzel		1040

NI and CR Isotopes in Allende Inclusions J. L. Birck, C. A. Prombo, G. W. Lugmair		1041

A37--A Coarse-Grained, Volatile Element-Poor Ca,Al-Rich Inclusion With Huge Fremdlinge A. Bischoff, H. Palme, B. Spettel		1042

AEM Characterization of Phases in a Hydrated IDP D. F. Blake, T. E. Bunch, A. J. Mardinly		1043

Telescopic Observations of Mars: A Search for Carbonates and Other Salts in the 4 μm Region D. L. Blaney, T. B. McCord		1044

Laboratory Spectral Measurements of Palagonite-Salt Mixtures in the Visible and Near Infrared--Implications for Mars D. L. Blaney, P. A. Walsh, T. B. McCord		1045

Microbeam Analysis of Interplanetary Dust Particles for Major Elements, Oxygen and Carbon G. E. Blanford, K. T. Verploeg, D. S. McKay		1046

Lunar Rotation and the Distribution of Dark-Halo Pyroclastic Deposits: A Cause for Asymmetric Ejecta Patterns G. Blount, R. Greeley		1047

The Occurrence of Seismically-Disrupted Antipodal Terrains G. Blount, P. Barbera, R. Pappalardo, S. Posin, A. Watts		1048

Aeolian Mixing and the Identification of Active Sand Surfaces on the Earth and Mars G. Blount, R. Greeley, N. Lancaster, P. R. Christensen, R. Arvidson		1049

Fremdlinge and the Cooling of CAI: Observational and Experimental Constraints From the Coexistence of NiFe and RuOs J. D. Blum, J. T. Armstrong, I. D. Hutcheon, G. J. Wasserburg		1050

Further Studies on the Phenomenon of Shock-Implanted Gases D. D. Bogard, F. Hoerz, P. Johnson, J. Jordan		1051

Magnesioferrite From a Nonmarine K-T Boundary Clay in Wyoming B. F. Bohor, E. E. Foord		1052

Flyash: an Analog for Spherules in K-T Boundary Clays B. F. Bohor, D. M. Triplehorn		1053

A High Abundance and Great Diversity of "Unmelted" Cosmic Dust Grains on the West Greenland Ice CAP P. Bonte, C. Jehanno, M. Maurette, E. Robin		1054

Surficial and Structural Analysis of Large Patterned Fractures in Southern Acidalia Planitia, Mars M. C. Borrello		1055

Differential Volatilization of Lunar Impact Glass Using Raleigh Fractionation Modeling L. J. Boschelli, D. S. McKay		1056

Shock-Enhanced Dissolution of Silicate Minerals: an Important Planetary Surface Process? M. B. Boslough, R. T. Cygan		1057

Numerical Model of Fine-Scale Igneous Layering A. E. Boudreau, I. S. McCallum		1058

Spectral and Thermal Characteristics of the Southeastern Amenthes Region, Mars S. Bougan, C. Leff, T. Maxwell		1059

Origin of CAI Rims--I: The Evidence From the Rare Earth Elements W. V. Boynton, D. A. Wark		1060

Fine-Grained Matrices of Chondritic Interplanetary Dust Particles (IDP's) J. P. Bradley, D. E. Brownlee		1061

Strontium, Neodymium and Plutonium in Chondritic Phosphates J. C. Brannon, F. A. Podosek, G. W. Lugmair		1062

Transmission Electron Microscopy of Graphite-Magnetite Aggregates in the Sharps (H3) Chondrite A. J. Brearley, E. R. D. Scott, G. J. Taylor, K. Keil		1063

Accretion Mantles on Mars: New Model for Viking Lander Site Characteristics and Implications for Mars Observer C. S. Breed, P. A. Davis, J. F. McCauley		1064

Ripple Blankets: Geomorphic Evidence for Regional Sand Sheet Deposits on Mars C. S. Breed, J. F. McCauley, P. A. Davis		1065

FUN Anomalies in Purple, Spinel-Rich Refractory Inclusions C. A. Brigham, D. A. Papanastassiou, I. D. Hutcheon, J. T. Armstrong, G. J. Wasserburg		1066

Effects of Small-Scale Surface Roughness on the Bidirectional Reflectance Spectra of Nickel-Iron Meteorites D. T. Britt, C. M. Pieters		1067

A Quantitative Comparison of Comet Halley and Carbonaceous Chondrites at the Submicron Level D. E. Brownlee, M. M. Wheelock, S. Temple, J. P. Bradley, J. Kissel		1068

Spectral Effects of Dehydration on Phyllosilicates E. A. Bruckenthal, R. B. Singer		1069

Evidence for Hydrothermal Alteration in Meteorites of Higher Petrologic Type R. Burgess, I. P. Wright, C. T. Pillinger		1070

Circular Structures of Diverse Origins in China: A Possible Resemblance to Northern Venus K. Burke, V. L. Sharpton, J. W. Kennedy		1071

Gossans on Mars: Spectral Features Attributed to Jarosite R. G. Burns		1072

The Graphical Analysis of Mixing Relationships--Ratio:Ratio Plots J. C. Butler		1073

A Non-Primordial Origin for Terrestrial Xe 129 Anomalies M. W. Caffee, G. B. Hudson		1074

Fast-Graphics, Solar System Simulation for Microcomputers J. D. Callahan		1075

A Model of Diffuse Radar Scattering From Martian Surface Rocks W. M. Calvin, B. M. Jakosky, P. R. Christensen		1076

Planetary Collision Calculations: Origin of Mercury A. G. W. Cameron, W. Benz, W. L. Slattery		1077

Surface Scattering Properties From Lunar Radar Polarization Data B. A. Campbell, S. H. Zisk, T. W. Thompson, P. J. Mouginis-Mark		1078

Volumes of Channels, Canyons and Chaos in the Circum-Chryse Region of Mars M. H. Carr, S. S. C. Wu, R. Jordan, F. J. Schafer		1079

A Laser Microprobe--Mass Spectrometric Study of an Alteration Product in the Shergottite EETA79001 R. H. Carr, E. K. Gibson Jr.		1080

Outcomes of Gravitational Encounters of a Planetesimal With a Planetary Embryo A. Carusi, R. Greenberg, G. B. Valsecchi		1081

Further Development of Monte Carlo Modeling of Lunar Megaregolith Thickness J. Cashore		1082

The Geological Evolution of Alba Patera, Mars P. Cattermole		1083

A Search for Evidence of Extinct Lead 205 in Iron Meteorites J. H. Chen, G. J. Wasserburg		1084

Further Aspects of Lunar Palaeointensity Determinations and the Origin of the Ancient Lunar Magnetic Field S. K. Chowdhary, S. K. Runcorn, D. W. Collinson, A. Stephenson		1085

Thermal-Infrared Spectral Observations of Martian Candidate Materials in Emission P. R. Christensen, S. J. Luth		1086

Comparative Studies of Luna 16, 20 and 24 Regoliths by Means of Magnetic Resonance and Mossbauer Spectroscopy A. Cimbalnikova, Z. Frait, O. D. Rode, T. Zemcik		1087

The Evolution of Experimental Regoliths: Effects of Impact Velocity M. J. Cintala, F. Hoerz, T. H. See, F. Cardenas		1088

Continuous Geochemical Surface Monitor and Hazard Detector for a Mars Rover B. C. Clark, M. G. Thornton		1089

Coma Particle Type Occurrences: Evidence for Chemical Heterogeneity in Comet Halley B. C. Clark, L. W. Mason, J. Kissel		1090

Characterization of Venus Subdued Terrains With Ground-Based Radar-Derived Data P. E. Clark, R. F. Jurgens, M. Kobrick		1091

Galileo Science Data System T. C. Clarke, J. L. Anderson		1092

Cosmic Chemical Memory of Ca48 50Ti Correlation D. D. Clayton		1093

Oxygen and Silicon Isotopes in Inclusions and Chondrules From Vigarano R. N. Clayton, T. K. Mayeda, G. J. MacPherson, L. Grossman		1094

Oxygen Isotopes in Allende Chondrules and Coarse-Grained Rims R. N. Clayton, T. K. Mayeda, A. E. Rubin, J. T. Wasson		1095

Theoretical Equilibrium Profiles of the Martian Perennial Polar Caps S. M. Clifford		1096

Possible Isotopic Resetting Mechanisms in Shergottite Meteorites R. O. Colson, L. Nyquist, G. McKay, F. Hoerz		1097

The Evolution of Topography on a Comet J. E. Colwell, B. M. Jakosky		1098

Geologic and Remote Sensing Studies of Rima Mozart: Early Results C. R. Coombs, B. R. Hawke		1099

Explosive Volcanism on the Moon C. R. Coombs, B. R. Hawke, L. R. Gaddis		1100

Thermokarstic Evolution of Impact Craters on Mars F. M. Costard, A. Dollfus		1101

Thickness and Volume of Mare Tsiolkovsky, Lunar Farside R. A. Craddock, R. Greeley		1102

Martian Outflow Channels: IRTM and Visual Observations R. A. Craddock, R. Greeley, P. R. Christensen		1103

Electromagnetic Emissions From Low Angle Hypervelocity Impacts D. A. Crawford, P. H. Schultz		1104

Miranda Geology and Tectonics: A Non-Catastrophic Interpretation S. K. Croft		1105

Tectonism and Volcanism in Ganymede's Dark Terrain S. K. Croft, B. N. Goudreau		1106

Equations of State of Ammonia-Water Liquid: Planetological Implications S. K. Croft, J. Kargel, J. I. Lunine		1107

Structural Control of Lunar Sinuous Rilles in the Orientale Basin D. A. Crown, R. Greeley		1108

Bilateral Topographic Symmetry Across Aphrodite Terra, Venus L. S. Crumpler, J. W. Head		1109

Regional Linear Cross-Strike Discontinuities in the Western Aphrodite Highlands, Venus L. S. Crumpler, J. W. Head, D. B. Campbell		1110

Age of A15 Norites E. J. Dasch, L. E. Nyquist, G. Ryder, A. M. Steele, H. Wiesmann, B. M. Bansal, C.-Y. Shih		1111

Photoclinometric Determination of Surface Topography and Albedo Variations on Io A. G. Davies, L. Wilson		1112

An Unaltered Group I Fine-Grained Inclusion From the Vigarano Carbonaceous Chondrite A. M. Davis, G. J. MacPherson, R. W. Hinton, J. R. Laughlin		1113

Electron-Microprobe and Cathodoluminescence Study of Glasses in Type 3 Ordinary Chondrites: Relevance to Metamorphism and Aqueous Alteration J. M. Dehart, G. E. Lofgren, D. W. G. Sears		1114

Eastern Lunae Planum Outflow Complex: Analogy to Overbank Flooding R. A. de Hon		1115

Striped Plains of Acidalia Planitia, Mars R. A. de Hon		1116

ALH82106/130 and the Fractionation of Augite-Bearing Ureilites J. S. Delaney, M. Prinz		1117

Geochemically Inferred Redox State in the Source-Materials of Terrestrial Impact Glasses J. W. Delano, V. Bouska, Z. Randa		1118

Multi-Element Abundances of Individual Mare Volcanic Glasses by Collaborative Electron Microprobe and Neutron Activation Analyses: Interim Report #2 J. W. Delano, S. S. Hughes, P. L. Verplanck, R. A. Schmitt		1119

The SR Isotope System in Geological Samples Shocked up to 60 GPa A. Deutsch		1120

Isotope Systematics in Crystalline Clasts of Shock Stage I-III From the Polymict Breccia of the Haughton Crater, Canada A. Deutsch, S. Teufel, A. Metzler-Ferling		1121

On the Problem of Uranus Magnetic Field Sh. Sh. Dolginov		1122

Grain Formation and Accretion: Initial Stages B. Donn		1123

Neutron Mode of the Mars Observer Gamma Ray Spectrometer D. M. Drake, W. C. Feldman, R. C. Reedy, B. M. Jakosky		1124

Lunar Geoscience Orbiter and the Origin of the Moon M. J. Drake		1125

Water, Rare Gases and Other Volatiles on Earth and Mars G. Dreibus, H. Waenke		1126

Evidence for 36 m.y. and 90 m.y. Periodicities in the Terrestrial Cratering Record R. J. Durrheim, W. U. Reimold		1127

The D/H and O18 O16 Isotopic Ratios in Comet Halley P. Eberhardt, R. R. Hodges, D. Krankowsky, J. J. Berthelier, W. Schulte, U. Dolder, P. Lammerzahl, J. H. Hoffman, J. M. Illiano		1128

The Geology of Pavonis Mons, Mars K. S. Edgett, J. R. Zimbelman, J. W. Branstrator		1129

Composition and Petrogenesis of Parental Komatiite Liquids D. Elthon		1130

Partitioning of NI Between Olivine and High-MgO Basaltic Liquids D. Elthon		1131

A Model of the Porous Structure of Icy Satellites J. Eluszkiewicz, J. Leliwa-Kopystynski		1132

Lunar Light Plains: Ages and Composition S. Engel, G. Neukum, R. Jaumann, E. Nagel		1133

Cosmogenic Radionuclides in H-Chondritic Meteorite Finds P. A. J. Englert		1134

Unusual Isotopic Compositions of Hydrogen, Nitrogen, and Carbon of Amino Acids and Carboxylic Acids From the Murchison Meteorite S. Epstein, R. V. Krishnamurthy, J. R. Cronin, S. Pizzarello, G. U. Yuen		1135

MG Isotopic Composition of Microtektites and Flanged Australite Buttons T. M. Esat, S. R. Taylor		1136

MG Isotopic Composition of Some Interplanetary Dust Particles T. M. Esat, S. R. Taylor		1137

Solar Cosmic Ray Produced Radionuclides in the Salem Meteorite J. C. Evans, J. H. Reeves, R. C. Reedy		1138

Lunar Meteorites Y-82192 and Y-82193: Identical Cosmic-Ray Exposure History and Terrestrial Age O. Eugster		1139

Trapped Xe Isotopically Different From Modern Solar Wind Xe in Lunar Breccia 60018 and Black Glass 74001 O. Eugster, S. Niedermann		1140

Determination of the Fe Isotopic Ratios in Terrestrial Minerals and a Lance Hibonite-Hercynite Inclusion A. Fahey, E. Zinner		1141

More Isotopic Measurements in CM Hibonites: Carbon, Oxygen and Silicon A. Fahey, J. N. Goswami, K. D. McKeegan, E. K. Zinner		1142

Design and Engineering of Lunar Science Experiments: The Importance of Getting an Early Start K. O. Fairchild, M. L. Roberts, K. C. Templin		1143

Vertical vs. Lateral Mixing of Highland Materials and Minimum Basalt Thickness in Northern Mare Fecunditatis W. H. Farrand		1144

Use of Accelerator Mass Spectrometry for the Determination of Osmium Isotopes U. Fehn, R. Teng, D. Elmore, P. W. Kubik, H. E. Gove		1145

Gravitational Effects on Mars Neutron Spectra W. C. Feldman, D. M. Drake, R. D. O'dell, F. W. Brinkley Jr., R. C. Anderson		1146

Lunar Agricultural System Design Considerations J. Fielder, N. Leggett		1147

A Metal Particle in Ca, Al-Rich Inclusion From the Efremovka CV Chondrite A. V. Fisenko, K. I. Ignatenko, A. Yu. Ljul, A. K. Lavrukhina		1148

Neodymium in HNO3-and HClO4-Soluble Fractions From the Efremovka CV Chondrite A. V. Fisenko, S. F. Karpenko, L. F. Semjonova, A. V. Ljalykov, V. G. Spiridonov, Yu. A. Shukolyukov, A. K. Lavrukhina		1149

Earth Encounter Velocities and Exposure Ages of IDPs From Asteroidal and Cometary Sources G. J. Flynn		1150

First Cosmic Dust Trace Element Analyses With the Synchrotron XRF Microprobe G. J. Flynn, S. R. Sutton		1151

Compositional Homogeneity and Heterogeneity in High Grade Enstatite Chondrites R. A. Fogel, P. C. Hess, M. J. Rutherford		1152

Variability in Spectral Signatures of Terrestrial Ignimbrites and Implications for Volcanology on Mars P. W. Francis		1153

Resurfacing in the Transition Zone in Eastern Mars: Evidence for Variation in Efficiency in Plains Formation H. Frey, J. A. Semeniuk		1154

Common Age Resurfacing Events in the Elysium-Amazonis Knobby Terrain on Mars H. Frey, J. A. Semeniuk, S. Tokarcik		1155

Age of Different Chondrules of Elenovka Meteorite M. M. Fugzan, M. A. Ivanova, A. Ya. Skripnik, Yu. A. Shukolyukov		1156

Instrumental Requirements and Observational Strategies for Spectrophotometric Data Acquisition During a CRAF-Type Asteroid Flyby M. J. Gaffey		1157

Surface Lithologic Heterogeneity and Body Shape for Asteroid (15) Eunomia: Evidence From Rotational Spectral Variations and Multi-Color Lightcurve Inversions M. J. Gaffey, S. J. Ostro		1158

Possible Assimilation by a Mafic Magma: The Endion Sill, Duluth, Minnesota J. E. Gardner, L. A. Haskin, J. C. Brannon		1159

Suspected Impact Crater Near AL Madafi, Saudi Arabia J. B. Garvin, H. W. Blodget		1160

Venus Surface Compositions: Implications From Terrestrial Geochemical Analogies J. B. Garvin, W. B. Bryan		1161

Laser Altimetry in Planetary Geology J. B. Garvin, J. L. Bufton, J. B. Abshire, M. T. Zuber		1162

On the Release of Oxygen From the Intensively Shocked Meteorites and Terrestrial Rocks M. V. Gerasimov		1163

Mass-Spectrometrical Analyses of Gases Originated During Impulsive Evaporation of Meteorites and Terrestrial Rocks M. V. Gerasimov, B. L. Satovsky, L. M. Mukhin		1164

Hydrogen Abundances vs. Depth in the Lunar Regolith: Results From an Apollo 15 Double Drive Tube and Deep Drill Core E. K. Gibson Jr., R. Bustin		1165

Hydrogen Distributions in Lunar Materials E. K. Gibson Jr., R. Bustin, A. Skaugset, R. H. Carr, S. J. Wentworth, D. S. McKay		1166

Coesite Associated with North American Tektite Debris in DSDP Site 612 on the Continental Slope Off New Jersey B. P. Glass		1167

A New Term is Needed to Distinguish Impact Ejecta in the Form of Glassy Spherules Containing Primary Crystallites From Microtektites B. P. Glass, C. A. Burns		1168

Petrochemical Specific Features of the Logoisk Crater Glasses L. I. Glazovskaya, O. V. Parfenova		1169

Locations, Temperatures and Areas of Io's Hot Spots From Multi-Color Infrared Photometry of Occultations J. D. Goguen, D. Matson, W. Sinton, R. Howell, M. Dyck, G. Veeder, T. Johnson, R. Nelson, A. Lane, R. McLaren		1170

Early Thermal Profiles of Ganymede and Callisto M. P. Golombek, W. B. Banerdt		1171

Failure Strength of Icy Lithospheres M. P. Golombek, B. Banerdt		1172

Physiographic Constraints on the Origin of Lunar Wrinkle Ridges M. P. Golombek, B. J. Franklin		1173

Geochemistry of Crustal Xenoliths From Xalapasco de la Joya (State of San Luis Potosi, Mexico) C. Gomez-Moran, D. Elthon		1174

Thermal Stability of Tochilinite J. L. Gooding, M. E. Zolensky		1175

Martian (?) Calcite and Gypsum in Shergottite EETA79001 J. L. Gooding, S. J. Wentworth, M. E. Zolensky		1176

Complex Igneous Activity on the Ureilite Parent Body C. A. Goodrich, J. H. Jones		1177

1986 DA and 1986 EB: Iron Objects in Near-Earth Orbits J. C. Gradie, E. F. Tedesco		1178

Physical Properties of the Beta Pictoris Circumstellar Disk J. Gradie, J. Hayashi, B. Zuckerman, H. Epps, R. Howell		1179

The EET 83309 Polymict Ureilite: Its Relationship to Other Ureilites on the Basis of Stable Isotope Measurements M. M. Grady, C. T. Pillinger		1180

A Possible Volatile-Rich Air-Fall Deposit in the Electris Region of Mars J. A. Grant, P. H. Schultz		1181

Possible Intense Vortex Tracks on Mars J. A. Grant, P. H. Schultz		1182

Global Geologic Mapping of Io R. Greeley, R. A. Craddock, D. A. Crown, L. A. Leshin, G. G. Schaber		1183

Venus: Compositional and Mechanical Effects From Windblown Grains R. Greeley, J. R. Marshall, J. B. Pollack		1184

Incipient Runaway Growth of Planetesimals: Why the Biggest Bodies Were Not All the Same Size R. Greenberg, B. Rizk		1185

Is There a Significant Periodic Signal in the Terrestrial Cratering Record? R. A. F. Grieve, A. K. Goodacre		1186

Limits on Models of Lithospheric Heat Transport on Venus From Impact Crater Density R. E. Grimm, S. C. Solomon		1187

Viscous Relaxation of Impact Crater Relief on Venus: Constraints on Crustal Thickness and Thermal Gradient R. E. Grimm, S. C. Solomon		1188

Evidence for a Thick Transient Layer in the Isidis Impact Basin P. Grizzaffi, P. H. Schultz		1189

Dust Emission of Comet Halley as Observed by In Situ Experiments E. Grun		1190

Thermoluminescence Properties of Synthetic Feldspars: Implications for Chondrite Thermal Histories K. R. Guimon, G. E. Lofgren, D. W. G. Sears		1191

Origin and Evolution of Valleys on Martian Volcanoes: The Hawaiian Analog V. C. Gulick, V. R. Baker		1192

Transport of Water From the Residual North Polar CAP on Mars R. M. Haberle, B. M. Jakosky		1193

Properties of Synthetic Uranus at High Pressures and Temperatures D. C. Hamilton, W. J. Nellis, N. C. Holmes, H. B. Radousky, F. H. Ree, M. Nicol		1194

Thermoluminescence of Inclusions From the Cumberland Falls Meteorite M. Haq, F. A. Hasan, D. W. G. Sears		1195

Comparative Resolutions of Possible Time Variations in the Weak Interaction Coupling Constant From Geochronology, Oklo and Primordial Nucleosynthesis C. L. Harper		1196

Geochronology, Time-Asymmetry and the Foundations of Quantum Mechanics C. L. Harper		1197

Fourier Analysis of Asteroid Lightcurves: Some Preliminary Results A. W. Harris		1198

Vertical Distribution of Water Vapor in the Atmosphere of Mars: Error Analysis and Preliminary Results H. M. Hart, B. M. Jakosky		1199

A Satellite/Asteroid Mystery and the Primordial Scattering of C Asteroids Through the Solar System W. K. Hartmann		1200

Modelling of Lunar Accretion in a Circumterrestrial Disk W. K. Hartmann, D. Spaute		1201

Comets and Dark Asteroids: an Update W. K. Hartmann, D. P. Cruikshank, D. J. Tholen		1202

Studies of Trojan and Hilda Asteroid Lightcurves W. K. Hartmann, D. J. Tholen, D. P. Cruikshank		1203

Thermoluminescence and X-Ray Diffraction Studies of Annealed Oligoclase C. P. Hartmetz, D. W. G. Sears		1204

Thermal Stability of Thermoluminescence in a Type 5 and Type 3.4 Ordinary Chondrite F. A. Hasan, M. Haq, D. W. G. Sears		1205

Toward Geochemical Prospecting for Lunar Ores L. A. Haskin		1206

Modeling the Effects of Breccia Fragment Size on Identification of Parent Rock Type, Based on a Stillwater Anorthosite Boulder L. A. Haskin, D. J. Lindstrom		1207

Modeling the Effects of Breccia Fragment Size on Perceived Rock Compositions L. A. Haskin, D. J. Lindstrom		1208

Nearly Pure Plagioclase Anorthosites; Lunar and St. Urbain L. A. Haskin, R. F. Dymek, R. L. Korotev, L. P. Gromet		1209

Remote Sensing Studies of the Rima Hyginus Region of the Moon B. R. Hawke, C. R. Coombs		1210

Evidence for Topographic Rises, Fracture Zones, Topographic Symmetry, Central Rift Zones, Transform Faults, and Crustal Spreading: Aphrodite Terra, Venus J. W. Head, L. S. Crumpler		1211

Magma Migration and Hawaiian-Style Eruptions in Shield Volcano Rift Zones; The Pu'u `O'o Eruptive Episodes, Kilauea East Rift, Hawaii J. W. Head, L. Wilson		1212

Compositions of Glass Fragments in Apollo 16 Regolith Breccias C. F. Heavilon, A. Basu		1213

Photometric Properties of Lunar Terrains Derived From Hapke's Equation P. Helfenstein, J. Veverka		1214

The Howardite Parent Body: Composition and Crystallization Models R. H. Hewins		1215

Raman Spectra of Carbon in the Canyon Diablo Iron Meteorite D. Heymann		1216

Raman Study of Experimentally Shocked Plagioclase D. Heymann, H. Boyer		1217

Raman Study of Carbon in Allende D. Heymann, N. W. Read		1218

Raman Studies of Shocked Dunite, Enstatite, and Augite D. Heymann, T. A. Cellucci, H. Boyer		1219

The K/T Impact Excavated Oceanic Mantle: Evidence From REE Abundances A. R. Hildebrand, W. V. Boynton		1220

Isotopic Mass Fractionation of Potassium in the Earth Compared to the Bulk Solar System R. W. Hinton, R. N. Clayton, E. J. Olsen, A. M. Davis		1221

Impact Spall as a Mechanism for Surface Material Ejection K. A. Holsapple, K. Y. Choe		1222

A Model for the Formation of Magnetic Anomalies Antipodal to Lunar Impact Basins L. L. Hood		1223

Contributions of an LGO Mission to the Solution of Lunar Geophysical Issues L. L. Hood		1224

Ganymede and Callisto: Impact Crater Ejecta Types V. M. Horner, R. Greeley		1225

Experimental Drainage Pits as Possible Analogues to Structures on PHOBOS K. C. Horstman, H. J. Melosh		1226

Experimental Regolith Studies: The Effects of Initial Fragment Size on Comminution Behavior F. Hoerz, T. H. See, M. J. Cintala, F. Cardenas		1227

Fayalite-Rich Rims Around Forsteritic Olivines in CAIs and Chondrules in Carbonaceous Chondrites: Types, Compositional Profiles and Constraints of Their Formation X. Hua, J. Adam, H. Palme, A. El Goresy		1228

Integrated Petrogenetic Models of Apollo 15 Yellow/Brown Glass, Green Glass and Olivine Mare Basalt, Consistent With the Magma Ocean--Cumulate Hypotheses S. S. Hughes, J. W. Delano, R. A. Schmitt		1229

Partial Evaporation of Pre-Solar Dust: The Mechanism of Fe/Silicate and Oxygen Isotopic Variation in Chondrites? G. R. Huss		1230

A Closer Look at the Significance of Chemical Variations in Enstatite Chondrites M. L. Hutson		1231

Correlated Morphological, Chemical, and Isotopic Systematics From Murchison (C2M) Hibonites T. R. Ireland		1232

The Kaidun Meteorite: Oxygen Isotopic Composition A. V. Ivanov, A. A. Ulyanov, V. I. Ustinov, Yu. A. Shukolyukov		1233

Sublimation of Water From the Residual North Polar CAP on Mars B. M. Jakosky		1234

Magnesian Members of the Lunar Ferroan Anorthosite Suite O. B. James		1235

Surface Tectonics From Sinker Induced Mantle Convection: Application to Miranda D. M. Janes, H. J. Melosh		1236

New Spectrophotometric Studies of the Lunar Surface: Distribution and Composition of Lithologic Units R. Jaumann, G. Neukum		1237

Unusual Cosmic Grains in a Jurassic Hardground C. Jehanno, D. Boclet, P. Bonte, A. Castellarin, R. Rocchia		1238

Fe/Ni Cosmic Dust Grains: A Comparison of the Greenland and Deep-Sea Collections C. Jehanno, M. Maurette, E. Robin		1239

Bits and Pieces From Halley's Comet E. K. Jessberger, J. Kissel		1240

A Three Component Model for the Bulk Composition of the Moon J. H. Jones, J. W. Delano		1241

Large Fossil Mud Lakes or Giant Mud Sheet Floods in Syrtis Major (Isidis Planitia) and Mare Australe, Mars H.-P. Jons		1242

Rare Gas and Petrological Studies of Disaggregated Size Separates of the Fayetteville Meteorite Breccia J. Jordan, R. A. Barrett, D. D. Bogard, D. S. McKay		1243

HG Geothermometry Applied to Achondritic Meteorites S. Jovanovic, G. W. Reed Jr.		1244

Density and Viscosity Measurements of NH3-H2O Liquids J. S. Kargel		1245

Mass Distributions in Minimum Mass Models of the Jovian, Saturnian, Uranian, and Solar Nebulae J. S. Kargel		1246

Nuclear Tracks of VH-Group Solar Cosmic Rays in the Ordinary Chondrite Samples L. L. Kashkarov, L. I. Genaeva, G. V. Kalinina, A. K. Lavrukhina		1247

Thermoluminescence in Separated Chondrules in the Kainsaz CO Chondrite V. G. Kashkarova, L. L. Kashkarov, G. V. Baryshnikova, A. K. Lavrukhina		1248

Experimental Constraints on the Early Differentiation of the Earth's Mantle T. Kato, I. Irifune, A. E. Ringwood		1249

Isotopic Characterisation of Kerogen-Like Material From the Murchison Carbonaceous Chondrite J. F. Kerridge, R. Shipp, S. Chang		1250

Thermal History of Eucrites: Model Based on Pyroxene Geospeedometry N. R. Khisina, L. V. Petushkova, A. Y. Skripnik, M. A. Nazarov, E. V. Zabalueva		1251

Mantle Plumes on Venus W. S. Kiefer, B. H. Hager		1252

A Numerical Study of the Giant Impact Origin of the Moon: The First Half Hour M. E. Kipp, H. J. Melosh		1253

Partitioning of Siderophile and Chalcophile Elements Between Metal, Sulfide, Olivine, and Glass in a Naturally Reduced Basalt From Disko Island, Greenland W. Kloeck, H. Palme		1254

The Melting of Metallic FeO to Over 100 GPa: Implications for Core Temperature and Composition E. Knittle, R. Jeanloz		1255

Water Content of Tektites and Impact Glasses and Related Chemical Studies C. Koeberl, A. Beran		1256

Petrology and Geochemistry of the Ningqiang (CV3) Chondrite C. Koeberl, Th. Ntaflos, G. Kurat, C. F. Chai		1257

Iridium Distribution in the Peat Layers From Area of Tunguska Event M. I. Korina, M. A. Nazarov, L. D. Barsukova, I. V. Suponeva, G. M. Kolesov, E. M. Kolensnikov		1258

Formation Models of Sialic Matter and Problem of Crust Composition for the Terrestrial Planets M. J. Korotaev, A. M. Nikishin		1259

Composition of Magnetic and Nonmagnetic Fractions of Noritic Impact Melt Breccias From Apollo 16 R. L. Korotev		1260

Does the Lunar Crust Have a Europium Anomaly? R. L. Korotev, L. A. Haskin		1261

Composition and Maturity of the Van Serg Crater Core (Section 79002) R. L. Korotev, R. V. Morris, H. V. Lauer Jr.		1262

Formation of the Lamellar Structure in Group IA and IIICD Iron Meteorites J. A. Kowalik, D. B. Williams, J. I. Goldstein		1263

A Spreading Center on Venus? R. C. Kozak, G. G. Schaber		1264

Partitioning of Gallium into Chromite, and Consequences for Iron Meteorite Formation A. Kracher, T. M. Benjamin, C. J. Duffy, P. S. Z. Rogers		1265

Fe, Ca-Rich Rims Around Magnesian Chondrules in the Kainsaz (CO3) Chondrite D. A. Kring		1266

Petrography and Mineral Chemistry of Spinel Grains Separated From the Murchison Meteorite S. M. Kuehner, L. Grossman		1267

The OC Puzzle: Pre-and Synaccretionary Processes Offer a Solution G. Kurat		1268

Allende-AF: Undisturbed Record of Condensation, Accretion, and Metasomatism G. Kurat, H. Palme, F. Brandstaetter, H. Huth		1269

On the Possible Ophiolitic Origin of Some Slave Province Greenstone Belts T. M. Kusky, W. S. F. Kidd, D. G. de Paor, C. Simpson, C. Isachsen, D. C. Bradley, L. Bradley		1270

Recent Evidence on the Nature of the Late Pliocene Impact Event F. T. Kyte, L. Zhou, J. T. Wasson		1271

SNC Meteorites: The Metamorphic Record Ph. Lambert		1272

Fracture Cascade for a Meteorite at Atmospheric Entry: Canyon Diablo, Odessa and Wolf Creek Irons B. Lang, K. Franaszczuk		1273

Impact Ionization Mass Spectrometry of Cometary Grains on Board Giotto, VEGA 1 and VEGA 2 Spacecrafts: Preliminary Statistical Analysis of Spectra in Compressed Modes Y. Langevin, J. Kissel, J.-L. Bertaux, E. Chassefiere		1274

Chemistry of the Apollo 15 Apennine Front: Highland Lithologies J. C. Laul		1275

Laser Probe39Ar-40Ar Dating of Impact Melt Glasses in Lunar Breccia 15466 M. A. Laurenzi, G. Turner		1276

Cosmic-Ray-Produced KR in Core Samples of the St. Severin Meteorite B. Lavielle, K. Marti, G. Simonoff		1277

Occurrence of Sc-Rich Phases in the Kainsaz CO Carbonaceous Chondrite A. K. Lavrukhina, A. Yu. Ljul, G. M. Kolesov		1278

The Isotopic Composition of Xe in Mineral Phases of the Pillistfer EL6 and Adhi Kot EH4 Enstatite Chondrites A. K. Lavrukhina, Yu. A. Shukolyukov, D. V. Minh, A. Z. Lavrenteva, S. A. Stakheev		1279

Observations of Industrial Sulfur Flows: Implications for Io S. W. Lee, D. A. Crown, N. Lancaster, R. Greeley		1280

Development of the Prototype Atmospheres Node of the Planetary Data System S. W. Lee, R. L. Davis, G. H. Ludwig, C. A. Barth, S. A. Stern, S. Lasater, K. Simmons		1281

Inferences on the Evidence for Extinct Mn-53 T. Lee		1282

Interstellar Diamonds in Meteorites R. S. Lewis, T. Ming, J. F. Wacker, E. Steel		1283

Stochastic Models of Refractory Interstellar Dust K. Liffman, D. D. Clayton		1284

Geochemical and Petrologic Studies of Clasts in Apennine Front Breccia 15459 M. M. Lindstrom, U. B. Marvin		1285

Protoplanet Accretion Rates in a Disk of Planetesimals With Low Random Velocities J. J. Lissauer, Y. Greenzweig		1286

Convective Stress Field in Venus H. S. Liu		1287

A Chemical Study of Kaba (CV3 Chondrite) Inclusions Y.-G. Liu, R. A. Schmitt		1288

Mokoia Ca-Al Inclusions (CAIs) With Negative and Positive CE Anomalies-Interim Report #2 Y.-G. Liu, R. S. Rajan, R. A. Schmitt		1289

Elemental Composition of Chondrules From the Murray CM Chondrite A. Yu. Ljul, G. M. Kolesov, A. K. Lavrukhina		1290

Dynamic Crystallization Experiments on Chondrule Melts of Porphyritic Olivine Composition: Effect of Annealing at 1200 and 1000 deg C on Major and Minor Element Zoning and Concentration G. E. Lofgren		1291

Dynamic Crystallization Experiments on Chondrule Melts of Porphyritic Olivine Composition: Petrographic Comparison of Natural and Experimentally Produced Chondrules G. E. Lofgren		1292

Olivine/Low-Ca Pyroxene Liquidus Relations and Their Bearing on Eucrite Petrogenesis J. Longhi, V. Pan		1293

History of Valles Marineris B. K. Lucchitta		1294

Characterization of Mineralogical Changes With Longitude on the Lunar Nearside Based on Spectral Reflectance Measurements P. G. Lucey, B. R. Hawke		1295

Criteria for the Remote Detection of Pristine Rock Using Near-Infrared Reflectance Spectroscopy P. G. Lucey, B. R. Hawke		1296

Probable Outcrops of Mg-Gabbronorite in the Lunar Highlands Detected by Near-Infrared Remote Sensing P. G. Lucey, B. R. Hawke		1297

Speculations on the Origin of the Possible Compositional Layering of the Upper Ten Kilometers of the Lunar Crust P. G. Lucey, B. R. Hawke		1298

A Search for Water on the Moon at the Reiner Gamma Formation, A Possible Comet Impact Site P. G. Lucey, T. R. Roush, P. D. Owensby, D. Blaney		1299

The Age of the Lunar Crust: 60025--Methuselah's Legacy G. W. Lugmair		1300

Trace Elements in Single Mineral Grains From Silicate Inclusions in the Landes Meteorite D. Luzius-Lange, H. Palme		1301

Nirgal Vallis Basin: Some Questions on Fluvial and Regolith History D. J. MacKinnon, K. L. Tanaka		1302

Rare Earth Element Distribution in a Complex Type B1 Allende Inclusion, an Ion Microprobe Study G. J. MacPherson, G. Crozaz, L. L. Lundberg		1303

Nonequilibrium Thermodynamics of Processes at the Inner-Outer Core Boundary in the Venus' Interior E. Majewski		1304

Computer Simulation Model for Early Post-Capture Lunar Orbital Evolution: Implications for Thermal History of Moon and Earth R. J. Malcuit, R. R. Winters		1305

Equation of State Synchrotron Experiments with Hydrogen at High Pressures H. K. Mao, L. Finger, R. Hazen, J. Xa, R. Hemley, A. Jeffcoat, P. M. Bell		1306

Comparisons of Dust Components in Three Dated Ice Samples From the Allan Hills Region, Antarctica U. B. Marvin		1307

Geological Evolution of Coronae (Complex Circular Features) on Venus H. Masursky		1308

Mars Lander/Rover/Returned Sample Sites H. Masursky, M. G. Chapman, P. A. Davis, A. L. Dial Jr., M. E. Strobell		1309

Fragmentation Process of Allende Meteorite During its Atmospheric Passage T. Matsui, E. Tajika		1310

Ages of Fracturing and Resurfacing Along the Martian Dichotomy Boundary Between Nepenthes and Nilosyrtis Mensae T. A. Maxwell, G. E. McGill		1311

The Geology of Pine and Crater Buttes: A Basaltic Plains Volcanism Planetary Analog Study P. F. Mazierski		1312

The Parental Magmas of the Stillwater Complex I. S. McCallum		1313

RB and CS in the Earth and Moon W. F. McDonough, S.-S. Sun, A. E. Ringwood, E. Jagoutz		1314

Mars as a Planet A. S. McEwen		1315

The 3:1 Kirkwood Gap as Sources of Ordinary Chondrites: Perspectives From Spectral Reflectance L. A. McFadden, F. Vilas		1316

Variable Activity at Comet Halley March 23-25, 1986: IUE Observations L. A. McFadden, M. F. A'Hearn, P. D. Feldman		1317

Petrologic Evaluation of the Components of Granulitic Breccia 67215 J. J. McGee		1318

Relative Ages of Faulting, Mesa Development, and Polygonal Terrane, Eastern Utopia Planitia, Mars G. E. McGill		1319

Topography Buried Beneath the Plains of Utopia and Elysium, Mars G. E. McGill		1320

The Role of Comets in the Prebiological Evolution of the Early Solar System C. P. McKay		1321

Whitlockite/Melt Partitioning and Henry's Law: Shergotty Late-Stage Minerals G. McKay, J. Wagstaff, L. Le, D. Lindstrom, R. Colson		1322

Hydrogen Isotopic Variations in Interplanetary Dust Particles K. D. McKeegan, P. D. Swan, R. M. Walker, B. Wopenka, E. Zinner		1323

Spherical-Shell vs. Flat-Plate Mascon Loading Models for Caloris W. B. McKinnon		1324

Matrix Compositions in Antarctic and Non-Antarctic CM Carbonaceous Chondrites H. Y. McSween Jr.		1325

Lunar Geoscience Observer Spacecraft B. A. Meberg, W. V. Fuldner, R. C. Maehl		1326

Sintering of Lunar Soil Simulants Using 2.45 GHz Microwave Radiation T. T. Meek, D. T. Vaniman, R. D. Blake, M. J. Godbole		1327

Geometrically-Arrayed, Instrument-Carrying Elevated Cable Systems for Investigating Inaccessible Regions of the Lunar Surface T. A. Meier		1328

A Finite-Element Study of Multiring Basin Tectonics H. J. Melosh, V. Hillgren		1329

Polymict Impact Breccias on the Eucrite Parent Body: I. Lithic Clasts in Some Eucrites and Howardites K. Metzler, D. Stoeffler		1330

Sulfide Nodules of Burkhala Iron Meteorite L. F. Migdisova, A. A. Yaroshevsky, N. I. Zaslavskaya		1331

The Hedjaz Meteorite: REE Abundances in Chondrules and Lithic Fragments K. Misawa, N. Nakamura		1332

Petrogenesis of Mafic Lithologies in Mesosiderites D. W. Mittlefehldt		1333

Different Formation Processes of the Moon, the Earth, and Meteorites Y. Miura		1334

Constraints on Cooling Histories of Ordinary Chondrites as Inferred From Chemical Zoning of Porphyritic Olivine M. Miyamoto		1335

Diffuse Reflectances 0.25 to 25 microns of an Enstatite Chondrite and Implications for Surface Minerals of M-Type Asteroids M. Miyamoto		1336

Scaling Law of Impact Fragmentation and Coagulation H. Mizutani, S. Kawakami, Y. Takagi, T. Naide, M. Hayakawa		1337

Silicon Isotope Systematics During Distillation C. Molini-Velsko, T. K. Mayeda, R. N. Clayton		1338

The 1984 Mauna Loa Eruption and Planetary Lava Flows H. J. Moore		1339

Giant Circular Structures in the Precambrian Shields as Evidences of Early Crust-Forming Processes on the Terrestrial Planets V. M. Moralev, M. Z. Glukhovsky		1340

Impact Driven Supply of Sodium and Potassium to the Atmosphere of Mercury T. H. Morgan, A. E. Potter, H. A. Zook		1341

Diffusion Coefficients of Cations and Oxygen in Synthesized Single Crystal Melilites and Their Implications to the Thermal History of Allende CAI M. Morioka, H. Yurimoto, T. Igusa, H. Nagasawa		1342

Detection of Parent Molecules in the 25-5 micron Spectrum of Comet Hally With the IKS-Vega Experiment V. I. Moroz, M. Combes, J. P. Bibring, N. Coron, J. Crovisier, T. Encrenaz, J. F. Crifo, N. Sanko, A. Grigoriev, D. Bockelee-Morvan, R. Gispert, C. Emerich, J. M. Lamarre, F. Recard, V. Krasnopolsky, T. Owen		1343

Ultramicrocrystalline Hematite: Properties and Occurrence on the Martian Surface R. V. Morris, H. V. Lauer Jr., A. V. Murali, D. G. Agresti, J. A. Newcomb		1344

Archean Anorthosites: Constraints on the Accumulation Process D. A. Morrison, W. C. Phinney, D. E. MacZuga		1345

Channels on Alba Patera, Mars: Evidence for Polygenic Eruptions P. J. Mouginis-Mark, J. R. Zimbelman		1346

Different Types of Dust Particles in Halley's Comet L. M. Mukhin, E. N. Evlanov, M. N. Fomenkova, V. N. Khromov, J. Kissel, O. F. Prilutsky, B. V. Zubkov, R. Z. Sagdeev		1347

Chemical and Isotopic Systematics of Deccan Traps, Western India: Evidence of Cyclic Volcanism and Discrete Magma Sources A. V. Murali, J. J. Mahoney, J. D. MacDougall, S. S. Deshmukh, D. P. Blanchard		1348

A Preliminary Process-Oriented Geologic History for Ganymede S. L. Murchie, J. W. Head		1349

Evidence for the Existence of Major Shear Zones on Ganymede S. L. Murchie, J. W. Head		1350

Origin and Evolution of Furrows in the Dark Terrain of Ganymede S. L. Murchie, J. W. Head		1351

Shear Zones on Ganymede: Global Nature and Effect on Grooved Terrain Formation S. L. Murchie, J. W. Head		1352

Nitrogen and Trace Elements in Muong Nong Tektites and Irghizites: Clues to Tektite and Impactite Formation S. V. S. Murty, P. N. Shukla, P. S. Goel		1353

Variations in Composition of Kimberlite Dike Matrix Examined With Mapping Spectrometer Data J. F. Mustard, C. M. Pieters		1354

Comparative Estimate of Viscosity Parameters of the Earth's Group Planets and Peculiarities of Their Tectonic Structures V. P. Myasnikov, M. S. Markov, E. P. Timoshkina, Zh. F. Rodionova		1355

Chondrules and Type B-1 CAIs Formed by the Same Heating Event H. Nagahara		1356

HN3-1 (Type B-1 CAI) Formed From Isotopically and Chemically Heterogeneous Interstellar Minerals and Condensates of the Solar System by Incomplete Melting H. Nagahara, H. Nagasawa, N. Nakamura, T. Matsui		1357

REE, Ba, Sr, Rb, and K Characteristics of Chondrules From the Tieschitz (H3) Chondrite H. Nagamoto, Y. Nishikawa, K. Misawa, N. Nakamura		1358

Rare Earth Distribution in the Allende Ca-Al-Rich Inclusion HN3-1 N. Nakamura, H. Nagasawa		1359

Amount of Extraterrestrial Material in the K/T Boundary Sediments M. A. Nazarov, D. D. Badjukov, L. D. Barsukova, A. S. Alekseev		1360

Metal-Rich CAI's in Efremovka (C3) M. A. Nazarov, F. Brandstaetter, A. A. Ulyanov, G. M. Kolesov, G. Kurat		1361

Lunar Granite: an Enigma With a New Perspective C. R. Neal, L. A. Taylor		1362

Mare Basalt Evolution: The Influence of KREEP-Like Components C. R. Neal, L. A. Taylor, M. M. Lindstrom		1363

Petrology and Geochemistry of Highland Clasts From Apollo 14 Breccias 14303, 14305, and 14321 C. R. Neal, L. A. Taylor, M. M. Lindstrom		1364

Very High Potassium (VHK) Basalt Petrogenesis: The Role of Granite and KREEP Components C. R. Neal, L. A. Taylor, M. M. Lindstrom		1365

Possible Formation of Carbonates in Ancient Lakes in the Valles Marineris, Mars: A Search of the Mariner 6/7 IRS Dataset S. S. Nedell, C. P. McKay		1366

Phosphates in Shergotty and EETA79001: Geochemistry and Petrogenesis R. J. Nevle		1367

Formation of the Moon and Terrestrial Planets: Constraints From V, Cr, and MN Abundances in Planetary Mantles and From New Partitioning Experiments H. E. Newsom, M. J. Drake		1368

TI Isotopes in Allende and Chainpur Chondrules and in the Kaidun Breccia S. Niemeyer		1369

Helium and Neon Isotopes in Extraterrestrial Particles A. O. Nier, D. J. Schlutter, D. E. Brownlee		1370

10Be Profiles in Lunar Surface Rock 68815 K. Nishiizumi, M. Imamura, C. P. Kohl, H. Nagai, K. Kobayashi, K. Yoshida, H. Yamashita, R. C. Reedy, M. Honda, J. R. Arnold		1371

Long-Lived Cosmogenic Nuclides in the Derrick Peak and Lazarev Iron Meteorites K. Nishiizumi, J. Klein, R. Middleton, J. R. Arnold		1372

Experimental Studies of Pre-Solar Grain Analogs J. A. Nuth, R. Nelson, M. Thiemens, B. Donn		1373

The Origin and Significance of the Earliest Archean Nulliak (Supracrustal) Assemblage, Northern Labrador A. P. Nutman, B. J. Fryer, D. Bridgwater		1374

Isotopic Studies of Shergottite Chronology: II. Possible Effect of Contamination on the Sm-Nd System L. E. Nyquist, B. M. Bansal, H. Wiesmann, C.-Y. Shih, G. McKay		1375

Isotopic Studies of Shergottite Chronology: I. Effect of Shock Metamorphism on the Rb-Sr System L. E. Nyquist, F. Hoerz, H. Wiesmann, C.-Y. Shih, B. Bansal		1376

On the Stability of "Meteorite Swarms" in Resonant Orbits--A Preliminary Study J. Oberst		1377

Lunar Seismic Impact Clusters--Evidence for the Presence of "Meteorite Streams" J. Oberst, Y. Nakamura		1378

Interstitial Ca-Rich Silicate Materials in the Yamato Ureilites With Reference to Their Origin H. Ogata, H. Takeda, T. Ishii		1379

Partition Coefficients for REE and HF Between Zircon and Liquid: Inferences for Lunar Granite Petrogenesis O. Okano, E. B. Watson, M. Tatsumoto		1380

Nickel-Iron Spherules in a Lunar Glass Sphere J. A. O'Keefe, R. Ganapathy		1381

Impact Crater Maximum Depth of Penetration and Excavation J. D. O'Keefe, T. J. Ahrens		1382

Meteorite Impact and the Extinction of Solar Radiation J. D. O'Keefe, T. J. Ahrens		1383

Petrography of EET 83212,7 and EET 83229,7: A Comparison of 2 New Howardites S. C. Okulewicz, J. S. Delaney		1384

The Compositional Zoning of Feldspathic Phases in Allan Hills 77005,32 C. O'Neill, Y. Ikeda, J. S. Delaney		1385

Solar Type He and NE in Diamonds M. Ozima, S. Zashu		1386

Formation of Feo-Bearing Olivines in Carbonaceous Chondrites by High Temperature Oxidation in the Solar Nebula H. Palme, B. Fegley Jr.		1387

FUN Isotopic Anomalies: Reincarnation in Purple Refractory Inclusions D. A. Papanastassiou, C. A. Brigham		1388

Rayleigh Distillation Constraints on MG Isotopic Compositions D. A. Papanastassiou, G. J. Wasserburg		1389

Sm-Nd Systematics in Coarse-Grained Refractory Inclusions From Allende D. A. Papanastassiou, H. H. Ngo, G. J. Wasserburg		1390

CaAl4O7 From Allende Type A Inclusion NMNH 4691 J. M. Paque		1391

A Finite Amplitude Necking Model for the Formation and Evolution of Rift Zones: Application to the Beta Regio Rift E. M. Parmentier, E. R. Stofan, J. W. Head		1392

Three-Body Resonance Trapping and the Asteroid Belt C. W. Patterson		1393

Volatile/Mobile Trace Elements in Eucrites--I. Antarctic/Non-Antarctic Comparisons R. L. Paul, M. E. Lipschutz		1394

Erosion of Mercury Silicate Shell During its Accumulation G. V. Pechrnikova, A. V. Vitjazev		1395

Very High Track-Densities in Forest Vale (H4) Merrillites: Was Cm248 Alive in the Early Solar System? P. Pellas, C. Perron, M. Bourot-Denise, C. Fieni, M. Ghelis, G. Crozaz		1396

Anorthosites: an Analogue Study W. C. Phinney, D. A. Morrison, D. E. MacZuga		1397

Stratigraphy and Evolution of the Lunar Highland Crust: A Sampling of Vertical and Regional Heterogeneities C. M. Pieters		1398

Information Content of Planetary Terrain: Varied Effectiveness of Parameters for the Earth R. J. Pike		1399

Toward Geometric Signatures for Planetary Terrain: an Assessment of Earth at 1:24,000 Scale R. J. Pike		1400

Spatial Distribution of Circular Features on Venus J. J. Plaut, R. E. Arvidson		1401

Cratering History of Miranda J. B. Plescia		1402

Cratering History of Umbriel, Titania, and Oberon J. B. Plescia		1403

Geology and Cratering History of Ariel J. B. Plescia		1404

Late-Stage Flood Lavas in the Elysium Region, Mars J. B. Plescia		1405

Planetary Wrinkle Ridges--Low-Angle Thrust Faults J. B. Plescia, M. P. Golombek		1406

Shocked Calcite From an Explosion Crater--Electron Paramagnetic Resonance C. A. Polanskey, T. J. Ahrens		1407

The Use of Anhysteretic and Rotational Remanent Magnetizations in Detecting Fine Iron Particles D. K. Potter, A. Stephenson		1408

Characterization of Surficial Units in the Central Equatorial Region of Mars M. A. Presley, R. E. Arvidson, P. R. Christensen		1409

Bencubbin, Kakangari, Tucson and Renazzo: A Speculative Connection Between Some of Their Major Components M. Prinz, M. K. Weisberg, C. E. Nehru, J. S. Delaney		1410

EET 83309, A Polymict Ureilite: Recognition of a New Group M. Prinz, M. K. Weisberg, C. E. Nehru, J. S. Delaney		1411

Search for Correlated Isotopic Effects in Allende CAls: II. Comparison With Mineralogical Data C. A. Prombo, A. Hashimoto, J. L. Birck, G. W. Lugmair, L. Grossman		1412

Ancient Oceanic Crust Subducted Beneath the Kaapvaal Craton: The Genesis of Eclogites in Kimberlites B. Pyle, C. R. Neal, L. A. Taylor		1413

Dynamic Crystallization Experiments on an Average Type I (MgO-Rich) Chondrule Composition P. M. Radomsky, R. H. Hewins		1414

Fe3+ in Impact Glasses and Tektites A. I. Raikhlin, A. D. Kirikov, V. S. Kozlov		1415

Circular Mare Ridges J. Raitala		1416

Highland Wrinkle Ridges on Mars J. Raitala		1417

Thrust and Strike-Slip Faulting in Mare Ridge Tectonics J. Raitala		1418

Neutron Capture Effects in Asteroidal Regoliths R. S. Rajan, G. W. Lugmair		1419

Cosmogenic Nuclide Production in Small Metallic Spherules R. C. Reedy		1420

Solar-Proton-Produced Nuclides in Meteorites R. C. Reedy		1421

Coupled Neutron/Gamma-Ray Spectroscopy From Lunar Orbit R. C. Reedy, D. M. Drake, W. C. Feldman, E. L. Haines, A. E. Metzger		1422

Fracture Density Statistics Along Radial Traverses Through the Crystalline Basement of the Vredefort Dome, South Africa W. U. Reimold		1423

INAA and Rb-Sr Isotope Analysis of Lake St. Martin Melt and Country Rocks W. U. Reimold, J. M. Barr, R. A. F. Grieve, M. Tredoux		1424

A Multi-Stage, Long-Term Evolution of the Vredefort Dome, South Africa-As Suggested by 40Ar-39Ar Dating of Pseudotachylite W. U. Reimold, E. K. Jessberger, T. Stephan		1425

Chondritic Interplanetary Dust and Primitive Chondrite Matrices: The Search for Chemically Pristine Solids in the Solar System F. J. M. Rietmeijer		1426

Formation of High-Temperature Minerals by Annealing of Amorphous, Low-Temperature Anhydrous Chondritic Interplanetary Dust F. J. M. Rietmeijer		1427

Silicone Oil: A Persistent Contaminant in Chemical and Spectral Micro-Analyses of Interplanetary Dust Particles F. J. M. Rietmeijer		1428

Gordian Knots and Lunar Origin A. E. Ringwood		1429

Shock Metamorphism at the Vredefort Structure, South Africa: Evidence for a Single Shock Event P. B. Robertson, R. A. F. Grieve, J. Alexopoulos, J. Coderre		1430

A Search for a Relationship Between Greenland Cosmic Dust Grains E. Robin, Ph. Bonte, C. Jehanno		1431

A Micrometeorite "Spectrum" for the Mass Distribution of Well Preserved Greenland Cosmic Dust Grains E. Robin, C. Jehanno, M. Maurette		1432

The Density Distribution of Lunar Craters of Different Degrees of Rim Sharpness and Completeness Zh. F. Rodionova, V. V. Shevchenko, A. A. Karlov, T. F. Smolyakova		1433

Cryptic Variation in Cumulate Dunites From Blow ME Down Mountain, Newfoundland D. K. Ross, D. Elthon, J. F. Casey		1434

Fracture Patterns on Earth and Mars: Pattern Genesis and Analysis L. A. Rossbacher, D. Melendrez		1435

Modification Styles of the Martian Impact Craters L. E. Roth, R. S. Saunders, T. W. Thompson		1436

Reflectance Spectra of Selected Mafic Silicates From .6 to 4.6 microns T. L. Roush, R. B. Singer, T. B. McCord		1437

Reflectance Spectra of Selected Phyllosilicates From .6 to 4.6 microns T. L. Roush, R. B. Singer, T. B. McCord		1438

The Spectral Reflectance, 0.6 to 4.3 microns, of Particulate Mineral-Water Ice Mixtures T. L. Roush, R. B. Singer, T. B. McCord		1439

The Ningqiang Carbonaceous Chondrite and the Origin of Aggregational and Granoblastic Chondrules A. E. Rubin, D. Wang, G. W. Kallemeyn		1440

Apollo 15 Olivine-Normative Mare Basalts: New Chemical Analyses, Chemical Dispersion, and Chemical Relationships G. Ryder, A. Steele		1441

A Test of the Accuracy of the Preliminary Macroscopic Identification of Lunar Coarse-Fine Particles: INAA and Petrographic Studies of 2-4 MM Particles From the Apennine Front G. Ryder, M. M. Lindstrom, K. Willis		1442

Chondrules and Matrix in the Ornans CO3 Chondrite: Possible Precursor Components A. E. Rubin, J. T. Wasson		1443

Primeval Lunar Satellites S. K. Runcorn		1444

Library of Mineral and Rock Spectra in the Thermal-Infrared (2.1-25.0 microns): Implications for Observations of Fine Particulate Planetary Surfaces J. W. Salisbury, L. S. Walter, N. Vergo		1445

Trace-Element Distributions Among Subunits of a Stillwater Anorthosite Boulder P. A. Salpas, L. A. Haskin, I. S. McCallum		1446

Is the Venusian Surface Really Old? G. G. Schaber, E. M. Shoemaker, R. C. Kozak		1447

Dark Ray and Dark Floor Craters on Ganymede P. M. Schenk, W. B. McKinnon		1448

Preliminary Scaling Results for Crater Rim-Crest Diameter R. M. Schmidt		1449

A Field Geologist's Return to the Moon H. H. Schmitt		1450

Oxidation-Reduction Chemistry in Diopside-Albite Melts H. D. Schreiber, K. K. McManus, S. A. Settle		1451

Exposure Ages of Basaltic Achondrites and Implications for the Stratigraphy of Their Parent Body L. Schultz		1452

Impact Velocity and Changes in Crater Shape, Morphology, and Statistics P. H. Schultz		1453

Impact Vaporization by Low-Angle Impacts P. H. Schultz, D. Crawford		1454

Transition Diameters for Crater Shape in Laboratory Experiments and on Planets P. H. Schultz, D. E. Gault		1455

Why do Lunar Normal Faults Propagate Upward? R. A. Schultz		1456

AMLAMP (Antarctic Meteorite Location and Mapping Project): A Progress Report J. Schutt, W. A. Cassidy, B. W. Fessler		1457

Preliminary Description of Double Drive Tube 79002/79001 C. Schwarz		1458

Accretionary Processes: Clues From Chondrites E. R. D. Scott, G. J. Taylor		1459

Formation of Agglutinate-Like Particles in an Experimental Regolith T. H. See, F. Hoerz, M. J. Cintala, S. Smrekar, F. Cardenas		1460

Interior Models of Io and the Surface Distribution of Hot Spots M. Segatz, T. Spohn		1461

Metal-Silicate Partition Coefficients for Some Volatile Siderophile Elements and Implications for Lunar Origin S. Seifert, A. E. Ringwood		1462

Petrochemical Trends of Crystallized Impact Melts T. V. Selivanovskaya		1463

Characterization of the Venus Equatorial Highlands Using Pioneer Venus Imaging Mode Data D. A. Senske, J. W. Head		1464

Onset of Tectonic Rille Development in Southern Mare Serenitatis: Evidence for Incomplete Pre-Mare Isostatic Compensation? V. L. Sharpton		1465

Lunar Boron: A Preliminary Study D. M. Shaw, T. A. Middleton		1466

Diagram Albedo-Color of Venus Surface According to Venera-13 Data Yu. G. Shkuratov, M. A. Kreslavsky, O. V. Nikolayeva		1467

On Spectral Albedo of PHOBOS and Deimos in UV-Range Yu. G. Shkuratov, N. P. Stunkevich, I. I. Antipova-Karataeva		1468

Crater Production on Venus and Earth by Asteroid and Comet Impact E. M. Shoemaker, R. F. Wolfe		1469

The Duolun Impact Crater, China W. Siben		1470

Petrology of a Low-Titanium Mare Basalt From Apollo 16 Regolith Breccia 60255 S. B. Simon, J. J. Papike		1471

Petrology of the Apollo 15 Apennine Front I: Impact Melt Rocks S. B. Simon, J. J. Papike		1472

Petrology of the Apollo 15 Apennine Front II: Plutonic Rocks and KREEP Basalts S. B. Simon, J. J. Papike		1473

Apollo 16 Regolith Breccias and Soils: Comparative Petrology and Chemistry S. B. Simon, J. J. Papike, J. C. Laul, S. S. Hughes, R. A. Schmitt		1474

Some Peculiarities of Mercurial Crater Distribution and the Research of Craters With Intersecting Rims T. P. Skobeleva		1475

Venus: Improved Spin Vector From Goldstone Radar Observations M. A. Slade, S. Zohar, R. F. Jurgens		1476

Viking Orbiter Multispectral Images Linked to Lander Images and Laboratory Analogs M. O. Smith, J. B. Adams, E. A. Guinness, R. E. Arvidson		1477

Iron Oxidation State and Weathering Studies of SNC and Other Antarctic Meteorites T. C. Solberg, R. G. Burns		1478

The Abundance and Distribution of Be in Allende Inclusions A. J. Spivack, H. Gnaser, J. R. Beckett, C. I. Measures, I. D. Hutcheon, G. J. Wasserburg		1479

Paleogeologic Maps of Mercury's Surface P. D. Spudis, J. E. Guest		1480

The Use of Basin Ejecta to Determine Lunar Crustal Structure and Composition: Current Models and LGO Contributions P. D. Spudis, B. R. Hawke		1481

Accretional Heating of the Satellites of Saturn and Uranus S. W. Squyres, R. T. Reynolds, A. L. Summers, F. Shung		1482

Mineralogic Evidence for Pre-Chondrule Nebular Conditions I. M. Steele, J. V. Smith		1483

Development of Space-Based Containerless Coating Processes L. D. Stephenson, A. Smith, J. M. Rigsbe, V. F. Hock		1484

Cometary Capture Rates and Extra-Solar Oort Cloud Encounters S. A. Stern		1485

Two Important Mechanisms Contributing to Cometary Evolution in the Oort Cloud S. A. Stern		1486

Nature and Sequence of Volcanic and Tectonic Activity in Beta Regio, Venus E. R. Stofan, J. W. Head, D. B. Campbell, S. H. Zisk, A. F. Bogomolov, A. T. Basilevsky, N. Armand		1487

Corona Structures on Venus: Models of Origin E. R. Stofan, J. W. Head, E. M. Parmentier		1488

Morphographic Projections for Maps of Non-Spherical Worlds P. J. Stooke, C. P. Keller		1489

Color/Albedo Provinces and Surficial Units of the Central Equatorial Region of Mars: Definitions and Methods E. L. Strickland III		1490

Latitude and Altitude Dependent Dust Opacity Variations and Their Effects on Martian Surface Observations E. L. Strickland III		1491

Mars-Rocks on Phobos? and a Possible Solution to the SNC Meteorite Abundance Problem E. L. Strickland III		1492

New Features Named on the Moon and Uranian Satellites M. E. Strobell, H. Masursky		1493

The Solar System Cratering Record: Voyager 2 Results at Uranus and Implications for the Origin of Impacting Objects R. G. Strom		1494

Lunar Geoscience Observer Mission Overview F. M. Sturms Jr.		1495

The Development of a Zirconia Cell for Generating Oxygen From the Martian Atmosphere J. W. Suitor, J. E. Schroeder, R. H. Steinbacher		1496

Parquet on Venus: Areas of Regional Deformations A. L. Sukhanov		1497

Ridged Belts on Venus: Compression or Extension? A. L. Sukhanov		1498

"Spiders" on Venus: Ring Complexes A. L. Sukhanov		1499

Quantitative Evaluation of Ballistic Sedimentation R. Sullivan		1500

Trace Element Contents of Eucritic Plagioclase Determined by Synchrotron X-Ray Fluorescence S. R. Sutton, J. S. Delaney, J. V. Smith, M. Prinz		1501

I-Xe Studies of Semarkona Chondrules: Dating Alteration T. D. Swindle, J. N. Grossman		1502

Xenon and Argon in Nakhla and Lafayette: Evidence for Multiple "Martian" Components T. D. Swindle, D. H. Garrison, C. M. Hohenberg, C. T. Olinger		1503

A Rb-Sr Age of an Impact Melted Sample in Lunar Meteorite K. Takahashi, A. Masuda		1504

CE Anomaly Shown in Lunar Highland Samples: an Examination From REE Abundances and Rb-Sr Systematics for Lunar Meteorites K. Takahashi, A. Masuda		1505

Mineralogy of New Lithic Clasts in Polymict Eucrites and Possible Crystallization of Diogenite From a Eucritic Melt H. Takeda, T. Aoyama		1506

Mineralogy of Dominant Clasts in Lunar Regolith Breccia 60019 and Comparison to Yamato Lunar Meteorites H. Takeda, H. Mori, T. Tagai, M. Miyamoto		1507

History and Morphology of Faulting in the Noctis Labyrinthus-Claritas Fossae Region of Mars K. L. Tanaka, P. A. Davis		1508

Development of the Chryse Hydrologic System, Mars K. L. Tanaka, D. J. MacKinnon		1509

Eruptive History of the Elysium Volcanic Province of Mars K. L. Tanaka, D. H. Scott		1510

The Lunar Geoscience Observers Role in Unraveling the Magmatic Evolution of the Moon G. J. Taylor		1511

Loss of Volatile Elements During Impact Events in Relation to Lunar Composition and Origin S. R. Taylor		1512

Isotopic and Petrologic Investigation of the Eucrites Cachari, Moore County and Stannern F. Tera, R. W. Carlson, N. Z. Boctor		1513

Demonstration of a Mass Independent Isotopic Fractionation in CO Reaction M. H. Thiemens, D. Meagher		1514

Evolution of Asteroid Taxonomy D. J. Tholen, J. F. Bell		1515

Limb Topography of Uranian Satellites P. Thomas		1516

Non-Newtonian Diapirism in the Icy Satellites P. J. Thomas, G. Schubert		1517

Non-Newtonian Ice Rheology and the Retention of Craters on Ganymede P. J. Thomas, G. Schubert		1518

The Viscosity of Miranda P. J. Thomas, R. T. Reynolds, S. W. Squyres, P. M. Cassen		1519

Goldstone Radar Observations of Mars: The 1986 Opposition T. W. Thompson		1520

Ultra-High Resolution Radar Mapping of the Moon at 70 CM Wavelength T. W. Thompson		1521

Geology of the Nakhlite Meteorites: Cumulate Rocks From Flows and Shallow Intrusions A. H. Treiman		1522

Passive Hypervelocity Noble-Gas Capture Experiments P. Tsou, T. Bernatowicz, D. Burnett, A. Chutjian, P. Eberhardt, R. Mawhorter, M. Neugebauer, A. Albee		1523

Hypervelocity Intact Capture in Multiple-Layer Films P. Tsou, S. T. J. Peng, A. L. Albee		1524

Tectonic Implications of Radiogenic Noble Gases in Planetary Atmospheres D. L. Turcotte, G. Schubert		1525

Effect of Shock on the Kinetics of Thermally-Induced Dehydration of Serpentine J. A. Tyburczy, T. J. Ahrens		1526

Fe-Cr-Ni Inclusion in the Shock-Metamorphosed Quartzite of the Terny Astrobleme A. A. Valter, V. V. Burmistrova, O. P. Sharkin		1527

Carbon in Dark Clasts of Allende C. C. A. H. van der Stap, D. Heymann, R. D. Vis, H. Verheul		1528

Simultaneous Measurements of C, Ni, and P in the Toluca and Algarrobo Iron Meteorites C. C. A. H. van der Stap, D. Heymann, R. D. Vis, H. Verheul		1529

Effects of the Solar System Oscillations About the Galactic Plane on the Cosmogenic Nuclide Production in Meteorites V. Vanzani, S. Sartori, C. Tuniz, B. M. Stievano, F. Marzari		1530

Petrology of Mare Basalt and Highland Clasts From Breccia 15498 S. Vetter, J. Shervais, M. M. Lindstrom		1531

Orbital Evolution of the Vapor Jet From a Giant Impact A. M. Vickery, H. J. Melosh		1532

When the Gas was Removed From the Zone of Terrestrial Planets? A. V. Vitjazev, G. V. Pechernikova		1533

Maxwell Montes, Venus: Geological Unit Map From Arecibo and Venera Data Sets and Evidence of Deformation History R. W. Vorder Bruegge, J. W. Head, D. B. Campbell		1534

Are IDPs and Halley Dust Similar and, If So, So What? R. M. Walker		1535

LGO Mission and Science Summary R. A. Wallace		1536

Spectral Variations in the Thermal Infrared Reststrahlen Band of Silicates L. S. Walter, J. W. Salisbury, N. Vergo		1537

Origin of CAI Rims-II: The Evidence From Refractory Metals, Major Elements and Mineralogy D. A. Wark, W. V. Boynton		1538

A Trio of Meteoritic Dunites, and New Data for Shergotty P. H. Warren, G. W. Kallemeyn		1539

Estimated Average Siderophile Element Contents of the Pristine Lunar Crust P. H. Warren, E. A. Jerde, G. W. Kallemeyn		1540

"New" Lunar Regolith Breccias; an Enigmatic Ferroan Anorthosite From Apollo 14 P. H. Warren, E. A. Jerde, R. V. Morris		1541

A Multiple-Impact Origin of Southeast Asian Tektites J. T. Wasson		1542

The Volcanic Plains Ridges of the Chryse and Amazonis Depressions T. R. Watters		1543

Characterization of Interplanetary Dust Particles From Antarctic Ice Samples S. J. Webb, M. E. Zolensky		1544

Orbital Resonances in the Solar Nebula: Timescales and Resonance Widths S. J. Weidenschilling, D. R. Davis		1545

Post-Perihelion Brightening of Halley's Comet: Spring Time for Halley P. R. Weissman		1546

Ancient Apollo 16 Regolith Breccias: Glass Populations and High Mg' Glass S. J. Wentworth, D. S. McKay		1547

Glasses in Apollo 15 Regolith Breccias S. J. Wentworth, D. S. McKay		1548

Ratio of Asteroidal Impact Rates on Mars and Earth G. W. Wetherill		1549

Factors Controlling Early Runaway Growth of Planetesimals G. W. Wetherill, G. R. Stewart		1550

Volcanic and Tectonic Evolution of Martian Impact Basins R. Wichman, P. H. Schultz		1551

Noble Gases in the Meteorite Fayetteville and in Lunar Ilmenite Originating From Solar Energetic Particles R. Wieler, H. Baur, J. P. Benkert, A. Pedroni, P. Signer		1552

CO2 and Noble Gas Emplacement Into Basalt by Artificial Shock; Relevance to EETA79001 Trapped Gas R. C. Wiens		1553

Uplands/Knobby-Terrain Relation on Mars D. E. Wilhelms, R. J. Baldwin		1554

Lunar Science From Lunar Laser Ranging J. G. Williams, X. X. Newhall, J. O. Dickey		1555

Particle Speed and Concentration in the Saltation Cloud: Full Saltation Development and Choking S. H. Williams, R. Greeley		1556

Project Leap: Lunar Ecosystem and Architectural Prototype F. Winisdoerffer, J. Brown, S. Ximenes		1557

Polymict Impact Breccias on the Eucrite Parent Body: II. Accessory Minerals in Lithic Clasts and Breccia Matrix of Eucrite-Howardite Meteorites C. Wohrmeyer, D. Stoffler		1558

PHOBOS & Deimos: Comets, Asteroids or Left Over Pieces of Mars? C. A. Wood		1559

Rotation Periods of Halley's and Other Comets C. A. Wood		1560

Venus Lives! (probably) C. A. Wood, P. Francis		1561

Was Chondritic Material Formed During Large-Scale, Protracted Nebular Evolution or by Transient Local Events in the Nebula? J. A. Wood		1562

Raman Observations of Individual Interplanetary Dust Particles B. Wopenka		1563

A Statistical Study of Mercurian Crater Classes Applied to the Emplacement of the Intercrater Plains A. Woronow, K. Love		1564

Carbonates in EETA 79001: Terrestrial or Martian? I. P. Wright, M. M. Grady, C. T. Pillinger		1565

Digital Presentation of Mars Topography S. S. C. Wu, A. E. Howington		1566

Topographic Map of Miranda S. S. C. Wu, F. J. Schafer, R. Jordan, A. E. Howington		1567

The Role of the Vaporization and Dissipation Processes in the Lunar History O. I. Yakovlev, O. M. Markova, B. M. Manzon		1568

Japanese Collection of Antarctic Meteorites K. Yanai, H. Kojima		1569

Specular Reflections and the Nature of Particle Surface Interactions S. A. Yon, C. M. Pieters		1570

Gila Observatory: Serious Solar System Research at the High School Level K. W. Zeigler		1571

Mars: Detection of Regolith H2O Sources From Space A. P. Zent, F. P. Fanale, S. E. Postawko		1572

Noble Metals and Other Siderophile Elements at the Precambrian-Cambrian Boundary at Zunyi, Guizhou, China L. Zhou, F. T. Kyte		1573

Triple-Junction Rifting and Detachment Surfaces Near the Pele Volcano on Io J. R. Zimbelman, K. Burke		1574

A Possible Volcanic Component in the Fine-Grained Materials Near Alba Patera, Mars J. R. Zimbelman, P. J. Mouginis-Mark		1575

High-Resolution Thermal Inertias at Equatorial Latitudes on Mars J. R. Zimbelman, L. A. Leshin, K. S. Edgett, S. Skinner		1576

New Very-High-Resolution Lunar Radar Measurements at 3. 0 CM Wavelength: Initial Maps of the Hadley/Apollo 15 Area S. H. Zisk, P. J. Mouginis-Mark, G. H. Pettengill, T. W. Thompson		1577

Tochilinite in C2 Carbonaceous Chondrites: A Review With Suggestions M. E. Zolensky		1578

Redox Conditions on Venus Surface M. Yu. Zolotov		1579

Stability of Scapolites on Venus Surface M. Yu. Zolotov, I. L. Khodakovsky, E. F. Westrum Jr.		1580

The Velocity Distribution and Angular Directionality of Meteoroids That Impact on an Earth-Orbiting Satellite H. A. Zook		1581

Venus Tectonics: On the Relationship of Isostatic Topography to the Wavelengths of Surface Deformational Features M. T. Zuber, E. M. Parmentier		1582

Eighteenth Lunar and Planetary Science Conference

TABLE OF CONTENTS