23st Lunar and Planetary Science Conference

		no.

Electrolytic Production of Lunar Iron and Oxygen at Room Temperature W. N. Agosto		1001

Impact Release of Noble Gases from the Murchison Meteorite T. J. Ahrens, L. Rowan, W. Yang, R. H. Becker, R. O. Pepin		1002

Al26, Be10, and Ca41 in Mesosiderites A. Albrecht, S. Vogt, G. F. Herzog, R. Middleton, B. Dezfouly-Arjomandy, D. Fink, J. Klein		1003

Studies of Antarctic Micrometeorites C. M. O'd. Alexander, M. Maurette, P. Swan, R. M. Walker		1004

Continued In Situ Studies of Interstellar Grains in Primitive Meteorites C. M. O'd. Alexander, P. D. Swan, R. M. Walker		1005

Occultation of the Star SAO 187255 by Titan: Titan's Atmosphere Yu. V. Alexandrov, F. P. Velichko, V. V. Korokhin, Ju. N. Krugly, V. G. Shevchenko		1006

Are There any Clusterings of the Cosmic-Ray Exposure Ages of L Chondrites? V. A. Alexeev		1007

Exposure Ages of L and LL Chondrites V. A. Alexeev		1008

Is There the Clustering of Cosmic-Ray Exposure Ages of H Chondrites at 30 Myr? V. A. Alexeev		1009

Sintering of Lunar Simulant Basalt C. C. Allen, J. A. Hines, D. A. Altemir, D. S. McKay		1010

Hydrogen Reduction of Lunar Simulant Glass C. C. Allen, D. S. McKay, R. V. Morris		1011

Computer Games Geologists Play: A Tool for Determining Appropriate Rover Autonomy J. H. Allton, D. M. Lyons		1012

SIMS Chemical Analysis of Extended Impacts on the Leading and Trailing Edges of LDEF Experiment A0187-2 S. Amari, J. Foote, C. Simon, P. Swan, R. M. Walker, E. Zinner, E. K. Jessberger, G. Lange, F. Stadermann		1013

Interstellar SiC with Unusual Isotopic Compositions S. Amari, P. Hoppe, E. Zinner, R. S. Lewis		1014

The Partitioning of CO and NI in a Simple Metal/Silicate System as a Function of Oxygen Fugacity and Temperature A. A. Amelin, C. J. Capobianco		1015

First Results from the Manson Impact Structure Core-Drilling Project: Preliminary Observations and Interpretations from the M-1 Core R. R. Anderson, J. B. Hartung, M. K. Reagan, M. S. Bell, O. Plocher		1016

Metallic Iron in Lunar Sample 79002, 2030 I. Antonenko		1017

Simulating Iron-Melt Equilibrium for Silicate Systems A. A. Ariskin, A. A. Borisov, G. S. Barmina		1018

Evidence for Ni-Pt-Ge-Te-rich `Opaque Assemblages' in CV3 CAI Being True Fremdlinge and Not Low Temperature Alteration J. T. Armstrong		1019

Surface Modification of Venus as Inferred from Magellan Observations of Plains and Tesserae R. E. Arvidson, R. Greeley, M. Malin, R. S. Saunders, N. Izenberg, J. J. Plaut, E. Stofan		1020

Carbon and Nitrogen Isotopes in CR Chondrites; Evidence for a Single Parent Body? R. D. Ash, C. T. Pillinger		1021

Analytical and Numerical Predictions for Regolith Production on Asteroids E. Asphaug, M. C. Nolan		1022

Theoretical Predictions for Fragment Size Distributions E. Asphaug, H. J. Melosh, E. Ryan		1023

Fields of Small Volcanoes on Venus (Shield Fields): Characteristics and Implications J. C. Aubele, J. W. Head, L. S. Crumpler, J. E. Guest, R. S. Saunders		1024

Multi-Scale Roughness Spectra of Volcanic Debris Flows R. T. Austin, A. W. England		1025

Shocked Rock Fragments from K/T Boundary Clay and Their Relevance to the Kara Impact Event D. D. Badjukov, M. A. Nazarov, E. V. Guseva		1026

Spatial and Temporal Relations Between Coronae and Extensional Belts, Northern Lada Terra G. Baer, G. Schubert, D. L. Bindschadler, E. R. Stofan		1027

Venusian Valleys and Channels V. R. Baker, G. Komatsu, V. C. Gulick, J. S. Kargel		1028

The Character of Lava Flow Margins S. M. Baloga, G. J. Taylor, B. C. Bruno		1029

Parallel Fracture Patterns on the Plains of Venus W. B. Banerdt, C. G. Sammis		1030

Analog Studies of Nanophase Iron Oxides in Mars Soil A. Banin		1784

Quantifying Crater Degradation in Maja Valles and Memnonia, Mars N. G. Barlow		1031

A Continuum Model for Atmospheric Response to an Advancing Ejecta Curtain O. S. Barnouin, P. H. Schultz		1032

Venera 9, 10 and 13 Landing Sites as Seen by Magellan A. T. Basilevsky, C. M. Weitz		1033

The Project of 1:1,000,000-Scale Geologic Mapping of Venera and VEGA Landing Sites, Venus A. T. Basilevsky, G. A. Burba, N. N. Bobina		1034

Preliminary Results of a Petrographic Investigation of Apollo 16 Core 60014 A. Basu, S. J. Wentworth, D. S. McKay		1035

Venus: Improved North Pole Position from Venera-15, 16 Radar Survey E. G. Belinkiy		1036

Spatial Variability of CO and CO2 on Mars from Near-Infrared Imaging Spectroscopy J. F. Bell III, D. Crisp		1037

Composition and Stratigraphy of the Plinius-Dawes Region of the Moon J. F. Bell III, B. R. Hawke		1038

Ferric Mineralogy of the Martian South Polar Region J. F. Bell III, P. G. Lucey, T. B. McCord		1039

Relative Abundances of Poorly-and Well-Crystalline Ferric Oxides in the Martian Soil and Dust from Telescopic Data and Terrestrial Spectral Analog Studies J. F. Bell III, R. V. Morris, J. B. Adams		1040

The Galileo SSI Experiment at Gaspra: Overview and Expectations M. J. S. Belton, J. Veverka, P. C. Thomas, C. R. Chapman, K. P. Klaasen, G. Neukum, A. S. McEwen, J. W. Head, M. Davies, R. Greeley, R. Greenberg, C. B. Pilcher, D. Morrison, A. P. Ingersoll, F. Fanale, T. V. Johnson		1041

The Break-up of the H Chondrite Parent Body and the Delivery of Fragments to Earth P. H. Benoit, D. W. G. Sears		1042

Metallographic Cooling Rate Differences Between Antarctic and Non-Antarctic H5 Chondrites and Some Implications P. H. Benoit, D. W. G. Sears		1043

Natural Thermoluminescence and Terrestrial Ages of Meteorites: Age Clustering in the Saharan Collection P. H. Benoit, D. W. G. Sears, S. W. S. McKeever		1044

TEM Studies of a Circumstellar Rock T. J. Bernatowicz, S. Amari, R. S. Lewis		1045

Compositional Variety of Particles Encountered by LDEF's Trailing Edge R. Bernhard, F. Hoerz		1046

Preliminary Analysis of LDEF Instrument AO187-1, Location A11 R. Bernhard, W. Davidson, F. Hoerz		1047

Martian vs. Terrestrial Volcanism: Are Partial Melt Properties Influential? C. M. Bertka		1048

Venus: Satellite Orbital Decay and Consequent Crater Production B. G. Bills		1049

Planetary Distribution and Nature of Compressional Deformation Around Artemis Corona, Venus F. Bilotti, J. Suppe		1050

Tellus Regio, Venus: Preliminary Magellan Observations of a Region of Complex Ridged Terrain D. L. Bindschadler, M. J. Tatsumura		1051

Mineralogy and Chemistry of the EL-Chondritic Melt Rock Ilafegh-009 A. Bischoff, H. Palme, T. Geiger, B. Spettel		1052

New Type 3 Ordinary Chondrites from the Sahara Desert A. Bischoff, D. W. G. Sears, P. H. Benoit, T. Geiger, D. Stoeffler		1053

Strength of IR Hydration Bands: Application to the Martian Surface J. L. Bishop, C. M. Pieters		1054

Ferrihydrite Found in Fe-rich Montmorillonite and Its Relationship to the Reflectance Spectra of Mars J. L. Bishop, C. M. Pieters, R. G. Burns		1055

Uranium Series and Oxygen Isotope Studies of the Peralkaline Rhyolites of Naivasha, Kenya Rift Valley S. Black, R. MacDonald, M. Kelly, A. E. Fallick		1056

Sequential Analyses of IDPs by LVSEM, TOF-SIMS, SIMS, and AEM D. F. Blake, R. H. Fleming		1057

Design of an X-Ray Diffraction/X-Ray Fluorescence Instrument for Planetary Applications D. F. Blake, C. Bryson, F. Freund		1058

A New Ureilite from the Sahara--Acfer 277 P. A. Bland, C. T. Pillinger, R. Hutchison		1059

Does Adsorbed Carbon Dioxide Contribute to the Infrared Spectrum of Mars? D. L. Blaney		1060

A Near-IR Spectral Investigation of the Schiller-Schickard Region of the Moon D. T. Blewett, B. R. Hawke, P. G. Lucey, J. F. Bell, J. F. Bell III, G. J. Taylor, C. A. Peterson, P. D. Spudis		1061

Influence of Surface Roughness on Windblown Sand: Earth, Mars, and Venus D. G. Blumberg, R. Greeley		1062

Lithic Clasts in Elephant Moraine 87521 Sample Two VLT Fractionation Series J. S. Boesenberg, J. S. Delaney		1063

Some History and Characteristics of NASA's Planetary Materials and Geochemistry Program D. D. Bogard		1064

39Ar-40Ar Ages of Howardite Clasts: Additional Evidence for Early HED Parent Body Bombardment D. D. Bogard, D. H. Garrison		1065

The Age of Copernicus: New Evidence for 800+15 Million Years D. D. Bogard, D. H. Garrison, D. S. McKay, S. J. Wentworth		1066

Ejection and Dispersal Mechanisms of the K/T Impact B. F. Bohor, W. J. Betterton		1067

No Evidence of Shock Metamorphism in Cuba at K/T Boundary B. F. Bohor, R. Brett, R. A. F. Grieve, D. Stoeffler		1068

The Origin of Highly Siderophile Elements in the Upper Mantle of the Earth: an Experimental Approach A. Borisov, H. Palme, A. Holzheid, B. Spettel, D. B. Dingwell, H. St. C. O'Neil		1069

Thermal Structure of the Solar Nebula A. P. Boss		1070

Computer Modeling of Aqueous Alteration on Carbonaceous Chondrite Parent Bodies W. L. Bourcier, M. E. Zolensky		1071

The Canteloupe Terrain of Triton J. M. Boyce, P. G. Rogers		1072

The Trace-Element Composition of LEW 88516 and Its Relationship to SNC Meteorites W. V. Boynton, D. H. Hill, D. A. Kring		1073

Pressure Attenuation in Impacts Determined Using a Finite Shell Model: Implications for Melt and Vapor Scaling R. A. Brackett, W. B. McKinnon		1074

Interplanetary Dust Analogues for Infrared Silicate Emission from Comets J. P. Bradley, H. J. Humecki, M. S. German		1075

Mineralogy of Fine-Grained Matrix in the Ivuna CI Carbonaceous Chondrite A. J. Brearley		1076

Phyllosilicates in the Matrix of the Unusual Carbonaceous Chondrite, LEW 85332 and Possible Affinities to CI Chondrites A. J. Brearley		1077

Anhydrite: A Lethal Target Rock at the Chicxulub Impact Site R. Brett		1078

Aspect Ratios of Lava Domes on the Earth, Moon and Venus N. T. Bridges, J. H. Fink		1079

Spectral Variation Within Asteroid Classes D. T. Britt, L. A. Lebofsky		1080

The Bidirectional Reflectance Spectrum of the ACFER 111 Regolith Breccia D. T. Britt, A. Pedroni		1081

Bidirectional Reflectance Spectra of Five Antarctic Light-Dark Ordinary Chondrites D. T. Britt, C. M. Pieters		1082

The Reflectance Spectrum of Troilite D. T. Britt, J. F. Bell, H. Haack, E. R. D. Scott		1083

Simulation Experiments for Planetary Gamma-Ray Spectroscopy by Means of Thick Target High-Energy Proton Irradiations J. Bruckner, U. Fabian, A. Patnaik, H. Waenke, P. Cloth, G. Dagge, V. Druke, D. Filges, P. A. J. Englert, D. M. Drake, R. C. Reedy, B. Parlier		1084

Fractal Analysis: A New Remote Sensing Tool for Lava Flows B. C. Bruno, G. J. Taylor, S. K. Rowland, P. G. Lucey, S. Self		1085

Matrix Pyroxenes in Howardites and Polymict Eucrites P. C. Buchanan, A. M. Reid		1086

Modeling the Volcanic Resurfacing of Venus M. A. Bullock, D. H. Grinspoon, J. W. Head		1087

Calderas on Venus M. H. Bulmer, J. E. Guest, E. R. Stofan		1088

A Study of the Rio Cuarto Loess Impactites and Chondritic Impactor T. E. Bunch, P. H. Schultz		1089

Transylvanian Ring Structure, Romania: Definition, Description, Possible Planetary Analogues G. A. Burba		1090

Topographic Comparison of Coronae on Venus and Transylvanian Ring Structure on the Earth G. A. Burba, V. P. Shashkina		1091

Studies of the Diffusion Properties of the I-Xe System in Bjurbole M. K. Burkland, T. D. Swindle		1092

Chemical Weathering on Mars: Rates of Dissolution and Oxidation of Ferromagnesian Silicate Minerals R. G. Burns		1093

Thermal Buoyancy on Venus: Underthrusting vs. Subduction J. D. Burt, J. W. Head		1094

A Comparison of the Radar Returns from the Icy Poles and Other Regions of Mars and Mercury B. Butler, D. O. Muhleman, M. Slade		1095

Exotic Nickel-Chromites in Impact Spherules from the Archean Barberton Greenstone Belt G. R. Byerly, D. R. Lowe		1096

Recurrent Rules in Martian Channel Organization: Implication for Their Formation N. A. Cabrol, E. A. Grin		1097

Sites of Residual Aquifers on Mars Through Channel Analysis N. A. Cabrol, E. A. Grin		1098

The Giant Impact Revisited A. G. W. Cameron		1099

Comparison of Magellan Measurements of Surface Roughness on Venus to Topographic Profiles of Terrestrial Basaltic Lava Flows B. A. Campbell		1100

Magellan Observations of Extended Impact Crater Related Deposits on the Surface of Venus D. B. Campbell, N. J. S. Stacy, W. Newman, R. E. Arvidson		1101

Post-Noachian Erosion Rates: Implications for Mars Climate Change M. H. Carr		1102

Thermal Models of the Primitive Solar Nebula P. Cassen		1103

Martian Volcanoes and Ground-Ice: Evidence for the Localised Enrichment of Sub-Surface Ice by Juvenile Volatiles J. A. Cave		1104

Fault Dips in the Valles Marineris: A Photogrammetric Study D. J. Chadwick, B. K. Lucchitta, P. Morgan		1105

Bright Crater Outflows on Venus D. J. Chadwick, G. G. Schaber, H. J. Moore, R. G. Strom		1106

Experimental Determination of Oxide Activities in Synthetic CAI and POI Melts L. Chamberlin, J. R. Beckett, E. M. Stolper		1107

Bulk Compositional Confirmation of the First EL3 Chondrite and Some Implications Y. Chang, P. H. Benoit, D. W. G. Sears		1108

951 Gaspra: Preliminary Galileo SSI Results on Craters, Collisions, and Regolith C. R. Chapman, D. R. Davis, G. Neukum, J. Veverka, M. J. S. Belton, T. V. Johnson, D. Morrison, A. McEwen		1109

Geologic Mapping of the Granicus Valles, Mars M. G. Chapman		1110

Th and U in Some Chondrites J. H. Chen, G. J. Wasserburg, D. A. Papanastassiou		1111

Image Processing Data Products for the Magellan Mission J. Clark, D. Alexander, P. Andres, C. Stanley		1112

Using Geochemical Profiles of Recent Impact Features in Northeastern Tranquillitatis to Characterize Mare/Highland Interfaces P. E. Clark, S. Joerg		1113

New Ideas for SiC: MG Burning in AGB Shell Flashes D. D. Clayton, L. E. Brown		1114

Oxygen Isotope Relationships Among Primitive Achondrites R. N. Clayton, T. K. Mayeda, H. Nagahara		1115

Analysis of Polycyclic Aromatic Hydrocarbons in Seventeen Ordinary and Carbonaceous Chondrites S. J. Clemett, C. R. Maechling, R. N. Zare, C. M. Alexander		1116

Inferring REE Substitution Reactions in Lunar Whitlockite R. O. Colson, B. L. Jolliff, L. A. Haskin		1117

Formation of Narrow Planetary Rings by Satellite Disruption J. E. Colwell, L. W. Esposito		1118

Chondrule Modifications as a Possible Indicator of Rim-forming Mechanisms H. C. Connolly Jr., R. H. Hewins		1119

The Experimental Production of Accretionary Rims Around Isolated Olivine Grains H. C. Connolly Jr., R. H. Hewins		1120

The Production of Accretionary Rims Arounds Chondrules by Drop Quenching into Dust: A Test for Parent Body Origin H. C. Connolly Jr., R. H. Hewins		1121

Damage Areas on LDEF Aluminum Panels: Preliminary Results C. R. Coombs, D. R. Atkinson, J. D. Wagner, M. Allbrooks		1122

Environment Modelling in Near-Earth Space: Preliminary LDEF Results C. R. Coombs, D. R. Atkinson, J. D. Wagner, L. B. Crowell, M. Allbrooks, A. J. Watts		1123

Pyroclastic Deposits on the Northwestern Limb of the Moon C. R. Coombs, B. R. Hawke, M. S. Robinson		1124

Apollo 17 Lunar Sounder: Evidence for Graben Structure in the Procellarum Basin? B. L. Cooper		1125

Mars Rover Mission: The French Views F. M. Costard, J. Achache, J. P. Bibring, M. Blanc, S. Coutin-Faye, Y. Langevin, P. Lognonne, P. Masson, D. Moura, F. Rocard		1126

Morphologic Variations of Degraded Impact Craters in the Martian Highlands R. A. Craddock, T. A. Maxwell		1127

Central Chryse Plaintia, Mars: Geologic Unit Interpretation from 1:500,000-scale Mapping R. A. Craddock, L. S. Crumpler, J. C. Aubele		1128

Experimental Investigations of Impact-generated Magnetic Fields D. A. Crawford, P. H. Schultz		1129

The Production and Evolution of Magnetic Fields During Hypervelocity Impacts D. A. Crawford, P. H. Schultz		1130

Re-Os Isotope Study of Iron Meteorites Using Negative Thermal Ion Mass Spectrometry R. A. Creaser, D. A. Papanastassiou, G. J. Wasserburg		1131

The Influence of Crystallization and Entrainment on the Emplacement of Lava Flows J. Crisp, S. Baloga		1132

Aspects of Tectonics on Icy Satellites S. K. Croft		1133

Observational Limits on Catastrophic Disruption S. K. Croft		1134

Gravito-Magnetic Orbits for Micron Sized Particles L. B. Crowell		1135

Spacetime Geodesy by Neural Networks L. B. Crowell		1136

Two Global Concentrations of Volcanism on Venus: Geologic Associations and Implications for Global Pattern of Upwelling and Downwelling L. S. Crumpler, J. C. Aubele		1137

Venus Volcanism: Global Distribution and Classification from Magellan Data L. S. Crumpler, J. W. Head, J. C. Aubele, J. Guest, R. S. Saunders		1138

Venus' Rotation Period and Pole Direction M. E. Davies, T. R. Colvin, P. G. Rogers, P. W. Chodas, W. L. Sjogren		1139

Melilite Composition Trends During Crystallization of Allende Type B1 Refractory Inclusion Melts A. M. Davis, S. B. Simon, L. Grossman		1140

Asteroid Collision Frequencies: Variations in Space and Time D. R. Davis, P. Farinella, M. Carpino		1141

Missions to Near-Earth Asteroids: SEI Milestones on the Way to Mars D. R. Davis, A. L. Friedlander, T. Jones, J. V. McAdams		1142

Preliminary Results of Computer Modeled Near deg C Water-Rock Interactions at the Martian Surface J. D. Debraal, M. H. Reed, G. S. Plumlee		1143

Complex Ridged Terrain at Phobe Regio, Venus from Magellan Data A. V. Decharon, E. R. Stofan		1144

Reflectance Geometric Corrections for a Global Spectral Mapping of Mars from Telescopic Near-Infrared Observations M. de Grenier, P. C. Pinet, S. D. Chevrel		1145

Annealing Studies of Type A Chondrule Analogs J. M. Dehart, G. E. Lofgren		1146

TEM and Cathodoluminescence Spectroscopic Studies of Type A Chondrule Mesostases J. M. Dehart, L. Keller, W. Protheroe, G. E. Lofgren		1147

Duration and Rates of Discharge Through a Martian Outflow System: Maja Valles R. A. de Hon, E. A. Pani		1148

In Situ Micro XANES Determination of Ferrous/Ferric Ration in Terrestrial and Extraterrestrial Plagioclase: First Reconnaissance J. S. Delaney, S. R. Sutton, S. Bajt, J. V. Smith		1149

Australite Flanges as Flight Data Recorders J. W. Delano		1150

Major-Element Compositions of Glasses in Apollo 16 Cores 60014 (Station 10) and 64001 (Station 4) J. W. Delano		1151

Geochemistry and Origin of Moldavite Tektites J. W. Delano, Y.-G. Liu, R. A. Schmitt, V. Bouska		1152

Melting Relations for Indarch (EH4) Under Reducing Conditions T. L. Dickinson, G. E. Lofgren		1153

High Temperature Reduction of Silicon in Enstatite Meteorites: Evidence from the Experimental Studies of Indarch T. L. Dickinson, G. E. Lofgren, I. Casanova		1154

The Coefficient of Restitution for Collisions of Icy Spheres J. Dilley		1155

Martian Surface Texture and Wind Effect Implications A. Dollfus, J. R. Zimbelman		1156

Experimental Simulations of Martian Neutron Spectra D. M. Drake, M. Drosg, R. C. Byrd, R. C. Reedy, D. A. Clark, P. A. J. Englert		1157

Mercury's Impact-induced Self-Destruction and Early Impact History of Inner Planets E. M. Drobyshevski		1158

Numerical Experiments on the Chemical Differentiation of a Convecting Plantary Interior: Possible Application to Venus L. Dupeyrat, C. Sotin, E. M. Parmentier		1159

Impact Crater Flows on Venus: Morphological Evidence for Complex Ejection Dynamics D. M. Duval, C. A. Wood		1160

2-Dimensional Modeling of the Cometary Phase Transition Within a Range of Temperatures N. S. Duxbury		1161

The Windblown Sands of Mars: Estimation of the Amount of Sand in Dark Intracrater Deposits K. S. Edgett, P. R. Christensen		1162

Mars: The Composition of Dunes and Other Dark Surficial Material K. S. Edgett, P. E. Geissler, K. E. Herkenhoff		1163

Characterization of Ejecta Facies Around Large Venusian Craters: Implications for the Origin of Flow-like Ejecta M. S. Edmunds, V. L. Sharpton		1164

53Cr-53 MN Systematics of Mn-bearing Sulfides in Four Enstatite Chondrites A. El Goresy, M. Wadhwa, H.-J. Nagel, E. K. Zinner, J. Janicke, G. Crozaz		1165

Can Secondary Ion Mass Spectrometry Resolve Variations in Lunar Surface Composition? R. C. Elphic, H. O. Funsten III, B. L. Barraclough, D. J. McComas		1166

Aerosol Contribution to the Reflectance Spectra of Mars S. Erard, P. Drossart, J.-P. Bibring, Y. Langevin, P. Pinet, S. Chevrel		1167

Near-Infrared Spectral Slope as a Clue to Aerosol Vertical Distribution on Mars S. Erard, P. Drossart, J.-P. Bibring, J. Rosenqvist, E. Chassefiere		1168

Disturbed Re-Os Isotope Systematics in IIIAB Iron Meteorites T. M. East, V. Bennett		1169

Lunar Regolith Residence Time of Apollo-16 Dimict Breccias O. Eugster		1170

History of 27 Chinese and 10 Other Chondrites Derived from Solar, Cosmic-Ray Produced, Radiogenic and Fissiongenic Noble Gases O. Eugster, Th. Michel, S. Niedermann, D. Wang, W. Yi		1171

BAR Plot Analysis of S Type Asteroid and Ordinary Chondrite Reflectances Spectra F. P. Fanale, B. E. Clark		1172

Lunar Volcanic Gases: The Predicted Presence of Chlorofluorocarbon Gases B. Fegley Jr.		1173

Crystallization Temperature of Melt Impact Rocks of Zhamanshin Astrobleme, (USSR) V. I. Feldman, L. V. Sazonova, N. N. Korotaeva		1174

Diaplectic Transformation of Minerals in Vorotilov Core, Puchezh-Katunk Astrobleme, Russia (Preliminary Data) V. I. Feldman, L. V. Sazonova, N. N. Korotaeva, L. B. Guseva, G. K. Budkov		1175

Experimental Mapping of the V36 Quadrangle of Venus, Based on Magellan Data N. Fienen, G. G. Schaber, K. L. Tanaka		1176

41Ca in the Norton County Aubrite D. Fink, J. Klein, B. Dezfouly-Arjomandy, R. Middleton, G. F. Herzog, A. Albrecht		1177

Venus and Earth: Morphostructural Comparison and Endogenetic Implications V. J. Finn, V. R. Baker		1178

Dissolution of Anorthite in Lunar Maria Basalts: Preliminary Experiments and Petrologic Significance A. B. Finnila, P. C. Hess, M. J. Rutherford		1179

Lunar Highland Soil Heterogeneity: Al/Si Estimated for the Limb and Farside from Galileo SSI and Apollo X-Ray Spectrometer Data E. M. Fischer, C. M. Pieters, A. S. McEwen, J. W. Head, M. J. S. Belton		1180

On the Origin of the Diamonds from the Efremovka Chondrite by the Thermoluminescence Data A. V. Fisenko, L. L. Kashkarov, L. F. Semjonova		1181

Isotopic Composition of Carbon and Nitrogen in the Diamonds from the Unequilibrated Ordinary Chondrite Krymka LL3.0 A. V. Fisenko, S. S. Russell, R. D. Ash, L. F. Semjenova, A. B. Verchovsky, C. T. Pillinger		1182

Mossbauer Spectra of H-5 Chondrites from Antarctica D. S. Fisher, R. G. Burns		1183

The Noblesville Meteorite: Mechanism of Oxidation of Iron in Ordinary Chondrites Induced by Aerated Icewater D. S. Fisher, R. G. Burns		1184

The Contribution of Meterotic Material to the Dust and Aerosols in the Atmosphere of Mars G. J. Flynn		1185

Element Abundances in Stratospheric Cosmic Dust: Indications for a New Chemical Type of Chondritic Material G. J. Flynn, S. R. Sutton		1186

Zinc Depletions and Atmospheric Entry Heating in Stratospheric Cosmic Dust Particles G. J. Flynn, S. R. Sutton, K. L. Thomas, L. P. Keller, W. Kloeck		1187

C-O-S-Cl Volatiles in Primitive Lunar Glasses: FTIR and EM Analyses of Apollo 15 Green Glasses R. A. Fogel, M. J. Rutherford		1188

Classification of Carbonaceous Component in Comet Halley "CHON" Particles M. Fomenkova, J. F. Kerridge, K. Marti, L. McFadden		1189

Iron-rich Particles in Comet Halley Dust M. Fomenkova, J. F. Kerridge, K. Marti, L. McFadden		1190

New Mars Global Gravity Field: Correlation with Topography, Physiography and Large Impact Basins H. Frey		1191

Thermal History and Climatic Implications of Early Hesperian Ages for Presumed Noachian Age Volcanic Flows on Mars H. Frey		1192

Additional Evidence of a Young Impact-Melting Event on the L-Chondrite Parent Body T. Fujiwara, N. Nakamura		1193

Thermal Behavior of Noble Gases Implanted into Minerals T. Futagami, M. Ozima, S. Nagai, T. Aoki		1194

Observations of Lunar Pyroclastic Deposits with Galileo SSI Multispectral Data L. Gaddis, A. McEwen, C. M. Pieters, J. Sunshine, R. Greeley		1195

Narrowing the Search for Ordinary Chondrites Among the Large S-Type Asteroids: Identification and Tests of Three Prime Candidates M. J. Gaffey		1196

E-Type Apollo Asteroid (3103) 1982BB: A Hungaria-Derived Near-Earth Source Body for the Aubrites M. J. Gaffey, K. L. Reed, M. S. Kelley		1785

39Ar-40Ar Dating of Shock-Melted Phases of the Chico Chondrite and Implications for K-Ar Dating of Impact Melts D. H. Garrison, D. D. Bogard		1197

Morphometry of Large Impact Craters on Venus: Comparisons with Terrestrial and Lunar Examples J. B. Garvin, G. G. Schaber		1198

Cook 003: A New CK Chondrite from the Nullarbor Region, South Australia T. Geiger, A. Bischoff, B. Spettel, A. W. R. Bevan		1199

Spectrophotometric Mapping of Coprates Quadrangle, Mars P. E. Geissler, R. B. Singer		1200

Radiation Characteristics of the Olivine Grains from Soko-Banka LL4 Chondrite L. I. Geneava, L. L. Kashkarov		1201

Laser Simulation of Equilibrium High-Temperature Vaporization M. V. Gerasimov, Yu. P. Dikovs, F. Wlotzka, L. M. Mukhin		1202

Subduction at Artemis Chasma R. C. Ghail, L. Wilson		1203

Volatiles in Six Interplanetary Dust Particles E. K. Gibson Jr., R. Bustin		1204

Origin of Microdiamonds in KT Boundary Clays I. Gilmour, S. S. Russell, C. T. Pillinger, M. Lee, J. W. Arden		1205

Impact Ejecta Associated with the Australasian and North America Microtektite Layers B. P. Glass, J. Wu		1206

Global Geological Processes and the Role of Tidal Energy in the Earth's and Other Planets Evolution M. Z. Glukhovsky, V. M. Moralev		1207

Light Scattering by Lunar-like Particle Size Distributions J. D. Goguen		1208

Chemistry and Mineralogy of Oxidation Products from a Nickel-rich Ataxite D. C. Golden, D. W. Ming, M. E. Zolensky		1209

New Radar-derived Topography of Ancient Aqueous Sedimentation Basins on Mars J. M. Goldspiel, S. W. Squyres, M. A. Slade, R. F. Jurgens, S. H. Zisk		1210

Limits on the Expansion and Contraction of the Moon M. P. Golombek, W. B. Banerdt, B. J. Franklin		1211

Thermal Analyzer for Planetary Soils (TAPS) Experiment, 2: Water Sensors J. L. Gooding, J. H. Allton, T. B. Byers, R. P. Dunn, F. L. Gibbons, D. B. Pate		1212

Addition of LREE-Enriched Material to a Ureilite? at 4.23 Ga: Evidence for Episodic Metasomatism C. A. Goodrich, G. W. Lugmair		1213

Isotopic Disequilibrium in Coexisting Mineral Phases in an Efremovka CAI: an Ion Probe Study J. N. Goswami, G. Srinivasan, A. A. Ulyanov		1214

On the Delivery of Meteorites and Near-Earth Asteroids T. Graf, K. Marti		1215

The Matrix Minerology of the Vigarano (CV3) Chondrite A. L. Graham, M. Lee		1216

Recreating the Asteroid Belt of the Recent Past J. C. Granahan, J. F. Bell		1217

Gradation of the Rio Cuarto Crater Field, Argentina J. A. Grant, P. H. Schultz		1218

Laboratory Simulations of Explosive Volcanism and Implications for the K/T Boundary A. J. Gratz, W. J. Nellis, N. Hinsey		1219

Shock Deformation and Transformation in the SiO2 System A. J. Gratz, W. J. Nellis, N. Hinsey		1220

Trace Element Stratification in the Stevns Klint Cretaceous/Tertiary Boundary Layers G. Graup, H. Palme, B. Spettel		1221

Wind-related Features on Venus Observed via Magellan R. Greeley, M. A. Geringer, R. E. Arvidson, C. Elachi, J. J. Plaut, R. S. Saunders, E. R. Stofan, S. D. Wall, C. M. Weitz, G. Schubert, E. J. P. Thouvenot		1222

Formational Constraints on Venusian "Canali" T. K. P. Gregg, R. Greeley		1223

Venusian Impact Craters: Effects of Differential Scaling R. A. F. Grieve, M. J. Cintala		1224

Highlander III: On the Origin and Evolution of Large Uplands on Venus R. E. Grimm, R. H. Herrick, R. J. Phillips		1225

Modeling Martian Channels by Bifurcation Theory and Differential Topology: Arguments for Drainage of Subsurface Aquifer E. A. Grin, N. A. Cabrol		1226

Venusian Stress Directions from Radial Fractures E. B. Grosfils, J. W. Head		1227

Effects of Oxygen Fugacity on Partitioning of NI and CO Between Olivine and Silicate Melt: Implications for Eucrite Parent Body Evolution T. L. Grove, K. E. Ehlers, M. J. Jercinovic, D. A. Zervas		1228

Gravitational Collapse of the Margins of Volcanic Domes on Venus J. E. Guest, M. H. Bulmer, K. Beretan, G. Michaels, S. Saunders		1229

Martian Hydrothermal Systems: Some Physical Considerations V. C. Gulick, V. R. Baker		1230

Channel and Valley Morphology on Venus: an Updated Classification V. C. Gulick, V. R. Baker, G. Komatsu		1231

Integrated Valley Systems on Venus: A Comparative Morphologic Study V. C. Gulick, G. Komatsu, V. R. Baker		1232

VEER: Countermeasures Against the Threat of Asteroid Impact J. G. Gurley, R. K. Cheng		1233

Thermal History of Chondrites: Hot Accretion vs. Metamorphic Reheating H. Haack, G. J. Taylor, E. R. D. Scott, K. Keil		1234

Water Detection at the Moon and Mars with a Combined Neutron-Gamma Ray Instrument E. L. Haines, A. E. Metzger, D. M. Drake		1235

Fusion Crusts of Achondrites: Changes of Mineralogy of Iron in Outermost Surfaces of Meteorites T. M. Hall, R. G. Burns		1236

Vredefort Coesite Confirmed with Raman Spectroscopy K. Halvorson, J. F. McHone		1237

Regional Non-Coaxial Deformation on Venus: Evidence from Western Itzpapalotl Tessera V. L. Hansen		1238

Experimental Data Bearing on the Oxidation State of Chromium and Vanadium in Mafic Volcanics B. Z. Hanson, J. W. Delano		1239

Opposition Effect and Negative Polarization: Laboratory Studies B. Hapke, R. Nelson, W. Smythe, V. Gharakanian, L. Horn, A. Lane		1240

Radar Mapping of Mercury J. K. Harmon, M. A. Slade		1241

146,147Sm-142,143 Nd Systematics of Early Terrestrial Differentiation C. L. Harper Jr., S. B. Jacobsen		1242

High Precision Investigations of the 53Mn-53Cr Systematics. I. Bulk Carbonaceous Chondrites, Planetary Reservoirs and the Moon C. L. Harper Jr., H. Wiesmann		1243

High Precision Investigations of the Mn53 Cr53 Systematics. I: Acapulco C. L. Harper Jr., L. E. Nyquist, B. Bansal, H. Wiseman		1244

The "Voyager Paradigm" of Planetary Cratering: Further Unabashed Revisionism W. K. Hartmann		1245

Crater Saturation Equilibrium in Ancient Uplands: Preliminary Results of New Modelling W. K. Hartmann, R. W. Gaskell		1246

Manson Impact Structure Rocks: Evidence for an Exotic Component J. B. Hartung, A. Kracher, R. Anderson, O. Plocher		1247

Parental Magmas of the Nakhlites Re-Examined R. P. Harvey, H. Y. McSween Jr.		1248

Effects of REE3+ Saturation on the Substitution in Whitlockite of 2 REE3++ Vacancy in Ca(IIA) for 3 Ca2+ L. A. Haskin, B. L. Jolliff, R. O. Colson		1249

On Partitioning of REE Between Whitlockite and Apatite in High-ITE Lunar Rocks: Petrologic Consequences L. A. Haskin, B. L. Jolliff, R. O. Colson		1250

The Distribution and Modes of Occurrence of Lunar Anorthosite B. R. Hawke, P. G. Lucey, G. J. Taylor, C. A. Peterson, P. D. Spudis		1251

Spectral Reflectance Studies of the Grimaldi Region of the Moon B. R. Hawke, C. A. Peterson, P. G. Lucey, G. J. Taylor, D. T. Blewett, P. D. Spudis		1252

Multispectral Study of Cerberus Dark Materials J. N. Head, R. B. Singer, P. E. Geissler		1253

Problems in Lunar Science: Galileo Results and the Promise of Future Exploration J. W. Head		1254

Large Shield Volcanoes on Venus: Distribution and Classification J. W. Head, L. S. Crumpler, J. C. Aubele		1255

A Major Global-Scale Concentration of Volcanic Activity in the Beta-Atla-Themis Region of Venus J. W. Head, L. S. Crumpler, J. C. Aubele		1256

Venus Global Volcanism: Characteristics and Distribution of Edifices and Deposits Implications for Resurfacing Style and Rates J. W. Head, L. S. Crumpler, J. C. Aubele		1257

951 Gaspra: Preliminary Albedos from Galileo Images P. Helfenstein, J. Veverka, P. C. Thomas, D. P. Simonelli, B. Carcich, A. S. McEwen, J. W. Head, S. Murchie, C. Chapman, M. Belton, K. Klassen, F. Fanale, The Galileo Imaging Team		1258

Multiple Scattering and Polarization of Thermal Emission from Particulate Planetary Surfaces B. G. Henderson, B. M. Jakosky, C. E. Randall		1259

Comparison of Magellan Data with the Interior Density Structure of Venus R. R. Herrick, R. J. Phillips		1260

Oxygen Isotopic Analysis of Allende Olivine by Ion Microprobe and Implications for Chondrule Origin R. L. Hervig, I. M. Steele		1261

Mass Fractionation of Nickel Isotopes in Metallic Cosmic Spherules Collected from Deep-Sea Sediments G. F. Herzog, G. S. Hall, D. E. Brownlee		1262

Dissolution of Plagioclase and the Origin of Mg-Suite Parent Magmas P. C. Hess		1263

Search for Fullerenes in Meteorites I: Roasting of Fullerenes in Air D. Heymann		1264

Earth-based Multispectral Observations of Mare Humorum and Western Oceanus Procellarum: Geological and Geochemical Implications H. Hiesinger, H. Hoffmann, R. Jaumann, R. Rebhan, G. Neukum		1265

Accretion of Fine Particles: an Optical Analysis of the Size Distribution and its Application to Determination of the Sticking Probability Y. Higuchi, T. Okada, N. Sugiura		1266

K/T Boundary Ejecta Distribution Predicts Size and Location of Chicxulub Crater A. R. Hildebrand, J. A. Stansberry		1267

Recent Studies of the Chicxulub Crater, Mexico A. R. Hildebrand, M. Pilkington, R. A. F. Grieve, P. B. Robertson, G. T. Penfield		1268

Metal-Silicate Partitioning Behaviour of Moderately Siderophile Elements in Ni-rich Systems V. J. Hillgren, C. J. Capobianco, M. J. Drake		1269

Spectral Comparison Between the S-Asteroids and Primitive Achondrites T. Hiroi, J. F. Bell, H. Takeda, C. M. Pieters		1270

Volcanic Degassing Under Thick Atmospheres: Consequences for Magmatic Volatiles on Venus J. R. Holloway		1271

Calculations of Catastrophic Disruptions of Asteroids K. A. Holsapple		1272

Deflection of Solar Wind Ions by Lunar Magnetic Fields: Implications for Resource Utilization L. L. Hood		1273

Gas Dynamic Heating of Chondrule Precursor Grains: Mechanisms for Generation of Nebular Shock Waves L. L. Hood, M. Horanyi		1274

Just How Many Types of Interstellar Carbon? P. Hoppe, S. Amari, E. Zinner, R. S. Lewis		1275

Crater Ejecta Velocities for Impacts on Rocky Bodies K. R. Housen		1276

XPS Studies of the Surface Chemistry of Lunar Highlands Regolith R. M. Housley		1277

Simulated Erosion of Martian Heavily Cratered Terrain A. D. Howard		1278

The Measurement of Optical Constants from Interstellar and Solar System Ice Analogs Using Transmission Infrared Spectroscopy D. M. Hudgins, S. A. Sandford, L. J. Allamandola, A. G. G. M. Tielens		1279

Presolar (?) Corundum in the Orgueil Meteorite G. R. Huss, I. D. Hutcheon, G. J. Wasserburg, J. Stone		1786

CR Isotopes in Differentiated Meteorites: Evidence for 53Mn I. D. Hutcheon, E. Olsen, J. Zipfel, G. J. Wasserburg		1280

Migration of Bodies During the Accumulation of Terrestrial Planets S. I. Ipatov		1281

Age and Trace-Element Chemistry of Yamato 791438 Zircon T. R. Ireland, K. Saiki, H. Takeda		1282

The Kaidun Meteorite: Aqueous Alteration of Metal Iron and Schreibersite A. V. Ivanov, N. N. Kononkova, E. V. Guseva		1283

Mass and Impact Velocity of the Meteorite Formed the Sterlitamak Crater in 1990 B. A. Ivanov, M. I. Petaev		1284

The Possible Radiative Heat Damage of the Venusian Surface B. A. Ivanov, A. A. Provalov, V. A. Rybakov		1285

Explosive Volcanism on Venus? M. A. Ivanov		1286

Venera 13 and 14 Landing Sites: Geology from Magellan Data M. A. Ivanov		1287

Global Distribution of Tesserae: Analysis of Magellan Data M. A. Ivanov, T. Tormanen, J. W. Head		1288

Geochemical Evidences of Methane-producing Bacteria's Activity in Rocks of Mars M. A. Ivanov, A. Yu. Lein, L. M. Mukhin		1289

Chromite-rich Inclusions in the Homestead (L5) Chondrite M. A. Ivanova, A. N. Krot, O. B. Mitreikina, N. G. Zinovieva		1290

Na-Al-Cr-bearing Chondrules from the Berdyansk (L6) Chondrite M. A. Ivanova, O. B. Mitreikina, A. N. Krot, N. G. Zinovieva		1291

Thermoluminescence of Oligoclase as Indicator of Shock Metamorphic Processes A. I. Ivliev, L. L. Kashkarov, G. V. Baryshnikova, D. D. Badjukov		1292

Resurfacing Processes on Venus: Approaching a Global View N. R. Izenberg, R. E. Arvidson, R. J. Phillips		1293

Laser-Fusion 40Ar/39 Age of Australasian Tektites G. A. Izett, J. D. Obrandovich		1294

The Spatial Density Structure of Planet-shepherded Interplanetary Dust A. A. Jackson, H. A. Zook		1295

Excess Heat and the Early Planet Evolution P. Jakes, A. M. Reid, I. Casanova		1296

Silicate Melts at Super Liquidus Temperatures: Reduction and Volatilization P. Jakes, S. Sen, K. Matsuishi, A. M. Reid, E. A. King, I. Casanova		1297

Out on a Limb: Mars Atmospheric Opacity During the Last Hundred Years B. M. Jakosky		1298

Compositional Variations in Mare-Basalt Plagioclase Produced by Differing Crystallization Regimes O. B. James, J. J. McGee		1299

Dependence of Color Ratios on the Observation Geometry R. Jaumann, G. Grobner, A. Dummel, H. Rebhan, G. Neukum		1300

Glasses at the K/T Boundary of Beloc (Haiti) are not Tektites C. Jehanno, L. Froget, E. Robin, R. Rocchia		1301

Apollo 11 High-K Basalts: an Apollo 17 Connection and Evidence for neoKREEP E. A. Jerde, G. A. Snyder, L. A. Taylor		1302

Apollo 11 Low-K Basalts: A Single Source and REEP Contamination E. A. Jerde, G. A. Snyder, L. A. Taylor		1303

Chemical Composition of Apollo 11 Mare Basalt Rocks: Evidence for Sample Heterogeneity in 10057 E. A. Jerde, G. A. Snyder, L. A. Taylor, Y.-G. Liu, R. A. Schmitt		1304

Widespread Alien Xe and Its Formation E. K. Jessberger, J. L. Jordan, Yu. A. Shukolykov, A. P. Meshik, D. V. Minh		1305

Incompatible Elements in Earth, Moon, EPB and SPB: A Comparison K. P. Jochum, H. Palme		1306

Flexure on Venus: Implications for Lithospheric Elastic Thickness and Strength C. L. Johnson, D. T. Sandwell		1307

Elliptical Impact Craters on Venus J. R. Johnson, G. Komatsu, V. R. Baker		1308

Mafic, Ferroan Lithologies from North Ray Crater, Apollo 16: Implications for Crustal Abundance B. L. Jolliff		1309

The Distribution of Rare Earth Elements Between Lunar Apatite and Whitlockite B. L. Jolliff, M. Wadhwa		1310

An Experimental Study of Partitioning Between Carbonate and Silicate Liquids J. H. Jones, D. Walker, D. A. Pickett, M. T. Murrell		1311

Classification of Porphyritic, Pyroxene-rich Chondrules in the Semarkona Ordinary Chondrite R. H. Jones		1312

Petrology of FeO-poor, Porphyritic Pyroxene Chondrules in the Semarkona Ordinary Chondrite R. H. Jones		1313

Fossil Glaciations in the Environs of the South Pole, Mars? H.-P. Jons		1314

Large-Scale Tectonic Features, Volcanoes, and Suspected Instrusions of the Ancient Uplands of Mars H.-P. Jons		1315

14C Terrestrial Ages of Two Lunar Meteorites, ALHA 81005 and EET 87521 A. J. T. Jull, D. J. Donahue		1316

14C Depth Profile in Lunar Rock 68815 A. J. T. Jull, D. J. Donahue		1317

Isotopic Studies Relevant to the Origin of the "White Druse" Carbonates on EETA 79001 A. J. T. Jull, D. J. Donahue, T. D. Swindle, M. K. Burkland, G. F. Herzog, A. Albrecht, J. Klein, R. Middleton		1318

Chondrite Melting Experiments: Can Angrite LEW 87051 be Produced by Partial Melting of a CV or CM Chondrite? A. J. G. Jurewicz, G. A. McKay		1319

Experimental Partitioning of Zirconium, Titanium, and Niobium Between Silicate Liquid and Plantinum Metal S. R. Jurevicz, J. H. Jones		1320

Mare Basalts in the Orientale Basin: Galileo Multispectral Observations S. D. Kadel, R. Greeley		1321

Three Ungrouped Carbonaceous Chondrites from MacAlpine Hills, Antartica G. W. Kallemeyn		1322

Remote Elemental Analysis of Planetary Surfaces Using Laser-Induced Breakdown Spectroscopy K. Y. Kane, D. A. Cremers		1323

The Compositions of Planetary Cores and Mantles J. S. Kargel		1324

The Composition of Venus and the Petrogenesis of Venusian Silicate Lavas J. S. Kargel, G. Komatsu		1325

Subglacial and Glaciomarine Processes in the Martian Northern Plaints J. S. Kargel, R. G. Strom, J. Lockwood, J. Shaw		1326

New Data on 146Nd Excess in HNO3-and HCLO4-Soluble Fractions of Effremovka CV3 Chondrite S. F. Karpenko, A. V. Fisenko, A. V. Ljalykov, L. F. Semenova		1327

Modelling of the Chondrule Formation Process by Laser Radiation L. L. Kashkarov, A. V. Fisenko		1328

Radiation Parameters of the Elenovka L5 Chondrite by the Track Data for the Olivine Crystals of Different Size L. L. Kashkarov, G. V. Kalinina		1329

Complex Radiation-Thermal History of the Kaidun Chondrite L. L. Kashkarov, N. N. Korotkova, A. Ya. Skripnik		1330

Fission Track Dating of the Kara Impact Structure L. L. Kashkarov, M. A. Nazarov, I. V. Suponeva		1331

Sapas Mons Venus: Sequence of Events in a Large Shield Volcano S. T. Keddie, J. W. Head		1332

Petrography and Mineral Chemistry of Calcium-and Aluminum-rich Inclusions in the Maralinga CK4 Chondrite L. P. Keller		1333

Impact Glasses and Vapor Condensates in Apollo 11 Soil 10084 L. P. Keller, D. S. McKay		1334

Thermal Processing of Cosmic Dust: Atmospheric Heating and Parent Body Metamorphism L. P. Keller, K. L. Thomas, D. S. McKay		1335

Magnetic Flocculation: The Metal-Silicate Separation C. E. Kenknight		1336

A Study of Trace Element Partitioning Between Olivine, Orthophyroxene and Melt in Chondrules: Equilibrium Values and Kinetic Effects A. K. Kennedy, G. E. Lofgren, G. J. Wasserburg		1337

Partitioning of REE Between Phosphates and Silicates in Mesosiderites: Evidence for Differing Degrees of Equilibration A. K. Kennedy, B. W. Stewart, I. D. Hutcheon, D. A. Papanastassiou, G. J. Wasserburg		1338

Isotopic Systematics of Lunar Surface Nitrogen: A Reappraisal J. F. Kerridge		1339

Convective Uplift and the Formation of the Tharsis and Elysium Regions of Mars W. S. Kiefer		1340

Spectrophotometry of the Moon for Calibration of Space-borne Imaging Instruments H. H. Kieffer, R. L. Wildey		1341

Evidence for Neutron Irradiation in the Early Solar System J. S. Kim, K. Marti		1342

Search for N and Xe Carriers in the Acapulco Meteorite Y. Kim, J. S. Kim, K. Marti		1343

On the Isotopic Signature of Recent Solar-Wind Nitrogen Y. Kim, J. S. Kim, K. Marti, J. F. Kerridge		1344

Mossbauer Spectrometer for Mineralogical Analysis of the Mars Surface for the Marts-96 Mission G. Klingelhofer, J. Foh, P. Held, H. Jager, E. Kankeleit, R. Teucher, E. N. Evlanov, V. N. Khromov, L. M. Mukhin, O. F. Prilutski, B. Zubkov, J. M. Knudsen, M. Madsen, G. V. Smirnov, J. Juchniewicz, C. D'Uston		1345

Bulk Composition and MIneralogy of Antarctic Micrometeorites W. Kloeck, W. Beckerling, B. Spettel, G. Flynn, S. Sutton		1346

Chemical Weathering of Evolved Igneous Rocks on Venus K. B. Klose, M. Yu. Zolotov		1347

Bistable Activity of a Cometary Analogous Ice-/Mineral Mixture During Insolation H. Kochan, E. Gruen, J. Gebhard, J. Benkhoff, E. Kuhrt, P. Lammerzahl, E. Lorenz, D. Mohlmann, K. Roessler, K. J. Seidensticker, H. Thomas		1348

Comparison of Blob Tectonics (Venus) and Pair Tectonics (Earth) G. G. Kochemasov		1349

Tesserae in the Light of a New Tectonics of Lithospheric Waves G. G. Kochemasov		1350

Chemical Composition of Meteoritic and Impactite Samples from the Rio Cuarto Craters, Argentina C. Koeberl, P. H. Schultz		1351

Bulk Major and Trace Element Analyses of Unmelted Micrometeorites from CAP Prudhomme, Antartica C. Koeberl, G. Kurat, T. Presper, F. Brandstaetter, M. Maurette		1352

Incipient Runaway Growth of Planets: Critical Physical Processes R. A. Kolvoord, R. Greenberg		1353

Discharge Estimates for the Venus "Outflow" Channel G. Komatsu, V. R. Baker		1354

Formation of Venusian Channels and Valleys, and Styles of Volcanism G. Komatsu, V. R. Baker		1355

Global Distribution of Venusian Channels and Implications for Venus Volcanism G. Komatsu, V. R. Baker, T. J. Parker		1356

Venus Lava Sapping Valleys G. Komatsu, V. C. Gulick, J. S. Kargel, V. R. Baker		1357

Compositional Differences Between Feldspathic Fragmental Breccias and Ancient Regolith Breccias from Apollo 16 R. L. Korotev		1358

Composition of Impact Melts from Station 13 at Apollo 16 R. L. Korotev		1359

Digital Geologic Maps of the Planets R. C. Kozak, R. M. Batson, N. K. Isbell		1360

The Trace-Element Composition of Eagles Nest and Its Relationship to Other Ultramafic Achondrites D. A. Kring, W. V. Boynton		1361

Cr-rich Chondrules and Inclusions in Ordinary Chondrites A. N. Krot, M. A. Ignova		1362

The Chromite-Whitlockite-Plagioclase Association in the Raguli (H3-4) Chondrite; Chemistry and Assumed Genesis A. N. Krot, M. A. Ivanova, M. I. Petaev		1363

Chromite Chondrules from the Ordinary Chondrites Raguli (H3-4) and Cullison (H-4): Mineralogy and Chemistry A. N. Krot, O. B. Mitreikina, M. A. Ivanova, I. A. Stroganov, N. G. Zinovieva		1364

Cr-rich Inclusion of Unusual Texture from the Gilgoin (H5) Chondrite A. N. Krot, O. B. Mitreikina, M. A. Ivanova, I. A. Stroganov, N. G. Zinovieva		1365

The Chromite-Whitlockite-Plagioclase Association in the Raguli (H3-4) Chondrite: Mineral Composition and Morphology A. N. Krot, O. B. Mitreikina, M. A. Ivanova, I. A. Stroganov, N. G. Zinovieva, N. N. Kononkova		1366

Tectonic Bedding as Deduced from Analysis of Linear Deformation Zones at Lavinia Planitia, Venus (Preliminary Results) V. P. Kryuchkov		1367

A Spectral Study of Venus Topography in Two Selected Equatorial Regions A. B. Kucinskas, D. L. Turcotte, J. Huang, P. G. Ford		1368

Loss of Ice from Accreting Giant-Icy-Satellites by the Escape of Hot Proto-Atmospheres K. Kuramoto, T. Matsui		1369

A SIMS Study of Some Allende Chondrules: Support for the New Chondrule Model G. Kurat, F. Brandstaetter, E. Zinner, H. Palme, B. Spettel		1370

CI-Like Micrometeorites from CAP Prudhomme, Antarctica G. Kurat, F. Brandstaetter, M. Maurette, C. Coeberl		1371

Oblique Rifting of the Corporation Margin at 1964 Ma: Evidence from the West Bay-Indian Lake Fault System T. M. Kusky, P. F. Hoffman		1372

The Role of the Moon in Gravitational Wave Astronomy N. L. Lafave, T. L. Wilson		1373

"Great" Lava Fields on Venus M. G. Lancaster, J. E. Guest, K. M. Roberts, J. W. Head		1374

Radar-Visible Wind Streaks on Venus Compared with Terrestrial Analogs R. Landheim, M. A. Geringer, R. Greeley, J. Barker		1375

Shock Effects in Quartz: Strong Dependence on the Pre-Shock Temperature F. Langenhorst, A. Deutsch		1376

On Nucleosynthesis of Solar System Matter A. K. Lavrukhina		1377

On the Heterogeneity of Conditions of Element Production in the Supernova Shell A. K. Lavrukhina, G. K. Ustinova		1378

The Oxygen Isotopic Composition of the Andreevka L3 Unequilibrated Ordinary Chondrite Chondrules A. K. Lavrukhina, V. I. Ustinov, G. V. Baryshnikova, Yu. A. Shukolyukov		1379

Influence of Electrostatic Charges on the Movement of Dust by Wind R. N. Leach, S. J. Schrodi, R. Greeley		1380

Polarimetric Survey of Crystal Clouds on Mars P. Lee, A. Dollfus		1381

The Small Craters of Venus--An Inspection Using Magellan Data C. Leff, A. D. Morrison		1382

On the Surface Layers of the Lunar Regolith Grains G. A. Lejkin, E. V. Zabalueva, V. S. Fainberg		1383

Maxwell and the Andes: Analogous Structures? A. Lenardic, W. M. Kaula, D. L. Bindschadler		1384

Interstellar Murchison Graphite: How Many Noble Gas Components? R. S. Lewis, S. Amari		1385

Bipolar Outflows and Meteorites K. Liffman		1386

Scandium/Iron and Cobalt/Iron Ratios as Indicators of the Sources of Stratospheric Dust Particles D. J. Lindstrom		1387

Geochemical Studies of Apennine Front Coarse-Fines Particulates M. M. Lindstrom, D. W. Mittlefehldt, R. R. Martinez		1388

LEW88516: A New Shergottite from Antarctica M. M. Lindstrom, D. W. Mittlefehldt, A. H. Treiman, S. J. Wentworth, J. L. Gooding, R. V. Morris, L. P. Keller, G. A. McKay		1389

Noblesville Meteorite Breccia: Recovery and Initial Characterization M. E. Lipschutz, S. F. Wolf, S. Gartenhaus, M. M. Lindstrom, D. W. Mittlefehldt, M. E. Zolensky, J. F. Wacker, P. H. Benoit, D. W. G. Sears, R. T. Dodd		1390

Absence of Zn, As, and SB Enrichments Relative to North American Shale Composite in 11 Worldwide K/T Boundary Clays and in Shatsky Rise K/T Boundary Clays Torpedoes Hydrothermal-Smoker Poisoning Hypothesis for the Oceanic Mass Extinction Mechanism at K/T Y.-G. Liu, R. A. Schmitt		1391

Permian/Triassic Boundary, Carnic Alps Austria, Revisited; Correlations with CE Anomalies, 813C, and Siberian Trap Flood Basalts, 1 Y.-G. Liu, R. A. Schmitt		1392

Permian/Triassic Boundary, Carnic Alps Austria, Revisited; Correlations with CE Anomalies, 813C, and Siberian Trap Flood Basalts, 2 Y.-G. Liu, R. A. Schmitt		1393

Alteration of Chondrules in ALH 84034, an Unusual CM2 Carbonaceous Chondrite J. Llorca, A. J. Brearley		1394

Thumbprint Terrain on the Northern Plains: A Glacial Hypothesis J. F. Lockwood, J. S. Kargel, R. B. Strom		1395

Lanthanide and Actinide Condensation into Oldhamite Under Reducing Conditions K. Lodders, B. Fegley Jr.		1396

Dyanamic Crystallization Studies of Enstatite Chondrite Chondrules: Cathodoluminescence Properties of Enstatite G. E. Lofgren, J. M. Dehart		1397

RELICT Enstatite and Olivine in Porphyritic Chondrules from Enstatite Chondrites Formed by Partial Melting of Precursor Material G. E. Lofgren, J. M. Dehart, T. L. Dickinson		1398

The Values and Variations of C/3 He and C/36 AR in Some Earth's Mantle Samples and Meteorites K. I. Lokhov, L. K. Levsky		1399

Volatiles in SNC Petrogenesis: A SR Signal? J. Longhi		1400

Pressure Effects in Anorthositic and Related Magmas J. Longhi, M. S. Fram, J. Vander Auwera, J. Montieth		1401

The Growth of AA and Blocky Lavas and Implications for Magmatic Feeding Systems R. Lopes-Gautier, C. R. J. Kilburn		1402

Depositional Mechanics of Impact-Produced Debris in the Archean Barberton Greenstone Belt, South Africa D. R. Lowe, G. R. Byerly		1403

The Four Primitive Chondrule Groups and the Formation of Chondrules J. Lu, D. W. G. Sears, P. H. Benoit, M. Prinz, M. K. Weisberg		1404

A Martian Landslide Caught in the Act? B. K. Lucchitta, H. M. Ferguson		1405

Valles Marineris Volumes B. K. Lucchitta, N. K. Isbell		1406

A Program of Systematic Study of the Effect of Noncompositional Factors on Telescopic Thermal Infrared Spectra of the Moon P. G. Lucey, B. C. Bruno		1407

A Near-Infrared Imaging Survey of the Moon P. G. Lucey, D. Blewett, C. Budney		1408

The 53Mn-53Cr Isotope System and Early Planetary Evolution G. W. Lugmair, C. MacIsaac, A. Shukolyukov		1409

The Ferrigmagnetic Phase in Nakhla and Zagmi--Implications for the Martian Fines M. B. Madsen, M. Olsen, J. M. Knudsen, D. Petersen, L. Vistisen		1410

Numerical Simulation of Retrograde Tidal Capture of a Triton-like Planetoid by a Neptune-like Planet: Two-Dimensional Limits of a Stable Capture Zone R. J. Malcuit, D. M. Mehringer, R. R. Winters		1411

Constraints on the Putative Companions to PSR1257+12 R. Malhotra, D. Black, A. Eck, A. Jackson		1412

DTA/GC: Limits of Detectability and Indentification of Minerals R. L. Mancinelli, M. R. White, A. Banin		1413

Ultrahigh Pressure Studies of Hydrogen H. K. Mao, R. J. Hemley		1414

Investigation of Stresses in the Lithosphere of Mars: New Tectonic Interpretation K. I. Marchenkov, E. M. Koshlyakov, V. N. Zharkov, A. M. Nikishin		1415

Space Gophers: Robotic Mining Systems in Inner Solar System Exploration A. A. Mardon		1416

The Utilization of Helmet Mounted Display (HMD) in Space Extra-Vehicular Suits and Lunar Extra-Vehicular Surface Suits A. A. Mardon		1417

Potential Meteorite Recovery Locales Within Russian Antarctic Logistical Capability A. A. Mardon, J. S. Williams		1418

Age Constraints on the Chicxulub Impact Structure: K/T or Not? L. E. Marin, J. M. Quezada Muneton, V. L. Sharpton, G. Ryder, B. C. Schuraytz, G. B. Dalrymple		1419

Simulation of the Nonstationary Processes in the Vicinity of Cometary Nuclei M. Ya. Marov, A. V. Kolesnichenko, Yu. Skorov		1420

Global Behavior of Martian Atmospheric Dust During the Viking ERA T. Z. Martin, M. I. Richardson		1421

Highland and Mare Components in the Callcalong Creek Lunar Meteorite U. B. Marvin, B. B. Holmberg		1422

Production of Cosmogenic Nuclides in Extraterrestrial Objects J. Masarik, P. Chochula, P. Povinec		1423

Xenon Production Cross Sections by High Energy Protons on Barium Targets K. J. Mathew, R. Michel, M. N. Rao		1424

Noble Gas Partition Between Metal and Silicate Under High Pressure J. Matsuda, M. Sudo, M. Ozima		1425

Antarctic Micrometeorites Smaller than 50 microns M. Maurette, D. E. Brownlee, D. J. Joswiak, S. R. Sutton		1426

The 1991 EUROMET Collection of Micrometeorites at Cap-Prudhomme, Antarctica: Discussion of Possible Collection Biases M. Maurette, G. Immel, M. Perreau, M. Pourchet, C. Vincent, G. Kurat		1427

Possible Causes of Depletion and Enrichment of Minor Elements in Antarctic Micrometeorites M. Maurette, G. Kurat, T. Presper, F. Brandstaetter, M. Perreau		1428

Geologic Effects of Atmosphere Loss on Mars: Evidence from Highland Erosion T. A. Maxwell, R. A. Craddock		1429

Geologic Mapping of the Elysium Region of Mars K. McBride		1430

Lead Isotopic Compositions of Plagioclases and Sulfides in the Stillwater Complex: Evidence for Isotopic Disequilibrium and Remobilization I. S. McCallum, M. W. Thurber, D. Bosch, B. K. Nelson		1431

ILAFEGH 009: A New Sample of the Diverse Suite of Enstatite Impact Melt Rocks T. J. McCoy, K. Keil, D. Bogard, I. Casanova, M. M. Lindstrom		1432

Monument Draw and the formation of the Acapulcoites T. J. McCoy, K. Keil, T. K. Mayeda, R. N. Clayton		1433

A Molecular Dynamic Study of the Thermodynamic Behavior of a Thin Film Undergoing Hypervelocity Penetration R. A. McDonald, W. G. Tanner Jr., W. M. Alexander		1434

LDEF's Space Exposure Yields Hypervelocity Impact Penetration Relationships J. A. M. McDonnell		1435

Temporal Variability of the Surface and Atmosphere of Mars: Viking Orbiter Color Observations A. S. McEwen		1436

Lunar Craters and Soils: Ages, Colors, and Regolith Thicknesses A. S. McEwen, L. R. Gaddis, G. Neukum, H. Hoffmann, C. M. Pieters, J. W. Head III		1437

Io Thermophysics: New Models with Voyager I Thermal IR Spectra A. S. McEwen, N. R. Isbell, J. C. Pearl		1438

Mantle Mineral/Silicate Melt Partition Coefficients E. A. McFarlane, M. J. Drake, D. C. Rubie, T. Gasparik		1439

State of Stress and Tectonics of Large volcanoes on Mars and Earth P. J. McGovern, S. C. Solomon		1440

Earth Multiple Impact Craters and Astroblemes J. F. McHone, R. S. Dietz		1441

REE Partition Coefficients for the Nakhla Parent Melt G. McKay, L. Le, J. Wagstaff		1442

Changes in Redox State During Ordinary Chondrite Metamorphism H. Y. McSween Jr., T. C. Labotka		1443

High Spatial Resolution Mapping of Lunar Mare Titanium Abundances D. E. Melendrez, S. M. Larson, R. B. Singer, J. R. Johnson		1444

Stability and Diffusion Time Scales of Water Ice in the Martian Regolith M. T. Mellon, B. M. Jakosky		1445

Compositional Variations on the Surface of Mars: Mixing Model Analysis from a Telescopic Spectral Image E. Merenyi, J. S. Miller, R. B. Singer		1446

Seasonal CAP Measurements at Mars via Gamma Ray Spectroscopy A. E. Metzger, E. L. Haines		1447

The Eskers of New York State: Formation Process Implications and Esker-like Features on the Planet Mars S. M. Metzger		1448

Morphology of Regional Fracture Systems on Venus G. A. Michaels, R. S. Saunders, E. R. Stofan		1449

Acquisition of Terrestrial KR and Xe by Meteoritic, Orthopyroxene Th. Michel, O. Eugster		1450

Cosmogenic Nuclide Depth Profiles in the Iron Meteorite, Canyon Diablo E. Michlovich, M. E. Lipschutz, M. Shortreed, S. Vogt, D. Elmore		1451

The Inclusion in the L-Chondrite Tsarev: New Type of Basaltic Matter in the Solar System L. F. Migdisova, A. A. Yaroshevsky, N. N. Konokova		1452

Radiance Factor Calibration of 1988 Visible and Near-IR Spectral Images of Mars J. S. Miller, R. B. Singer, W. K. Wells, L. Weller		1453

Method for the Stabilization and Characterization of Phyllosilicates in Carbonaceous Chondrites D. W. Ming, S. V. Yang, D. C. Golden, K. L. Thomas, L. P. Keller, K. Krivian, R. A. Barrett, M. E. Zolensky		1454

The Vredefort Dome, South Africa: New Structural Geological Data from the Granite-Greenstone Terrane in the Southeastern Quadrant R. C. A. Minnitt, W. U. Reimold, W. P. Colliston		1455

U-Th-Pb, Sm-Nd, and Rb-Sr Isotopic Systematics of Lunar Meteorite Asuka-31 K. Misawa, M. Tatsumoto, K. Yanai		1456

Projectile Dissemination in Impact Melts from Meteor Crater, Arizona D. W. Mittlefedhlt, T. H. See, F. Hoerz		1457

Two-Stage Cooling History of the Moore County Eucrite M. Miyamoto, H. Takeda		1458

Infrared Diffuse Reflectance Spectra of Some Carbonaceous Chondrites M. Miyamoto, M. E. Zolensky		1459

CaO Contents in Olivine: an Experimental Study M. Miyamoto, D. S. McKay, G. E. Lofgren, M. B. Duke		1460

An Explosive Eruption on Venus H. J. Moore, P. M. Schenk, J. J. Plaut, C. M. Weitz		1461

Cocharan and Other Venuian Impact Craters H. J. Moore, C. M. Weitz, G. G. Schaber		1462

Why the Surfaces of Outer Belt Asteroids are Dark and Red? L. V. Moroz, C. M. Pieters, M. V. Akhmanova		1463

Hazes and Clouds on Mars: Some of the PHOBOS Mission Results V. I. Moroz		1464

Maturity of the 60013/14 Core R. V. Morris, H. V. Lauer Jr.		1465

On Developing TAPIs (Time and Provenance Indicators); A Scenario for Robotic Lunar Sampling Followed by Analysis in Terrestrial Laboratories B. E. Moss, L. A. Haskin, R. L. Korotev, B. L. Jolliff		1466

Emplacement of Long Lava Flows at Elysium Mons, Mars P. J. Mouginis-Mark		1467

The Forms and Evolution of Water in Martian Soil: Evidence from ISM Imaging Spectroscopy S. L. Murchie, S. Erard, J. Bishop, J. Mustard, J.-P. Bibring, Y. Langevin		1468

The Nature and Distribution of Albedo Variations on Dark and Light Materials on Ganymede S. L. Murchie, P. Helfenstein, J. Head, D. Domingue, G. Hanson		1469

The Geology of the Interior Deposits of Valles Marineris from Viking Images and ISM Imaging Spectroscopy S. L. Murchie, S. Erard, J. F. Mustard, J.-P. Bibring, Y. Langevin, J. W. Head, C. M. Pieters		1470

Spectral Properites of Orientale Basin Materials from Galileo Images S. L. Murchie, J. W. Head, A. S. McEwen, J. F. Mustard, C. M. Pieters, M. S. Belton		1471

The Origin of Grooves and Crater Chains on PHOBOS J. B. Murray, D. A. Rothery, G. Thornhill, J.-P. Muller, T. Cook		1472

Solar Gases in Parsa Enstatite Chondrite S. V. S. Murty		1473

Production of the Martian Atmosphere by 2-Stage Outgassing of an Early Magma Ocean D. S. Musselwhite, M. J. Drake, T. D. Swindle		1474

Pyroxene Chemistry of the Syrtis Major Volcanic Plateau J. F. Mustard, S. Erard, J.-P. Bibring, Y. Langevin, J. W. Head, C. M. Pieters		1475

Schickard Cryptomare: Interaction Between Orientale Ejecta and Pre-Basin Mare from Spectral Mixture Analysis of Galileo SSI Data J. F. Mustard, J. W. Head, S. M. Murchie, C. M. Pieters, M. S. Belton		1476

Olivine at Low Pressures and Its Implication for the Origin of Chondrules H. Nagahara, I. Kushiro, B. O. Mysen		1477

Incongruent Evaporation of Diopside to Akermanite H. Nagahara, B. O. Mysen, N. Shimizu		1478

The Gabbro-Eclogite Phase Transition and the Elevation of Mountain Belts on Venus N. Namiki, S. C. Solomon		1479

Chemical Working Fluid Mechanism for Recycling and Exothermic Heating of Io's Surface D. B. Nash, G. R. Vanhecke		1480

Zeolitization of Impactites and Brecia in Puchezh-Katunki Astrobleme M. V. Naumov		1481

The Kara Structure as a Possible K/T Impact Site M. A. Nazarov, D. D. Badjukov, A. S. Alekseev		1482

Chemical Relationship Between Kara Crater Rocks and K/T Glasses M. A. Nazarov, D. D. Badjukov, L. D. Bausukova, N. N. Konokova, T. V. Romasheva		1483

The Kara Impact Structure: Nd-Sr Isotopic Composition of an Impact Melt M. A. Nazarov, S. F. Karpenko, A. V. Ljalikov, M. I. Smolyar, E. M. Kolesnikov, L. D. Barsukova		1484

The Petrogenesis of Apollo 12 Mare Basalts, Part 1: The "Lumpers" Versus the "Splitters" C. R. Neal, M. D. Hacker, L. A. Taylor, R. A. Schmitt, Y.-G. Liu		1485

The Petrogenesis of Apollo 12 Mare Basalts, Part 2: Identification of Dinstinct Olivine & Pigeonite Suites, and Open-System Evolution C. R. Neal, M. D. Hacker, L. A. Taylor, R. A. Schmitt, Y.-G. Liu		1787

The Recognition of Monomict and Polymict Clasts from Apollo 17 Breccias C. R. Neal, L. A. Taylor, R. A. Schmitt, Y.-G. Liu		1486

The Explosion in the Atmosphere of Mars Caused by a High-Speed Impact of Cosmic Bodies I. V. Nemtchinov, V. V. Shuvalov		1487

Siderophile Element Abundances and Behavior H. E. Newsom, P. D. Noll Jr., F. A. Slane, T. B. Beserra		1488

Carbon and Nitrogen Isotope Studies of a Suite of Type CO3 Carbonaceous Chondrites J. Newton, J. W. Arden, C. T. Pillinger		1489

Spallation-produced 21 NE in Individual Orgueil Olivines R. H. Nichols Jr., C. M. Hohenberg, J. N. Goswami		1490

22Ne-E(H) and 4He in Single SiC and 22 Ne-E(L) in Single C of Known C-Isotopic Compositions R. H. Nichols Jr., C. M. Hohenberg, P. Hoppe, S. Amari, R. S. Lewis		1491

Helium Release from Interplanetary Dust Particles in Laboratory Studies Simulating the Heat Pulse Experienced by Particles During Atmospheric Entry A. O. Nier, D. J. Schlutter		1492

The Giant Impact: A New Paradigm for the Origin of the Global Crustal Dichotomies of the Terrestrial Planets O. V. Nikolaeva, K. B. Klose		1493

Exposure History of Separated Phases from the Kapoeta Meteorite K. Nishiizumi, J. R. Arnold, M. W. Caffee, R. C. Finkel, J. Southon		1494

10Be and 26AI in Individual Cosmic Spherules from Antarctica K. Nishiizumi, J. R. Arnold, J. Klein, R. Middleton, D. E. Brownlee, E. H. Hagen, G. Faure		1495

A Geochemical Model for the Enriched Crust and Depleted Mantle of Mars M. D. Norman		1496

The Physical Properties of Carbonatite Lavas: Implications for Planetary Volcanism G. E. Norton, H. Pinkerton		1497

Petrological Studies and Bulk Chemical Analyses of Eight Antarctic Aubrites Th. Ntaflos, C. Koeberl		1498

Laboratory Studies of Very Small Iron Grains: Magnetically Enhanced Coagulation J. A. Nuth, O. Berg, J. Faris, P. Wasilewski		1499

Nd Isotopic Evidence for Lunar Crust/Mantle Mixing--Possibly During a Basin-Forming Impact L. E. Nyquist, C.-Y. Shih		1500

147Sm - 143Nd Ages and 146 Sm-142 Nd Formation Intervals of Basalt Fragments from the HED Parent Body L. E. Nyquist, B. M. Bansal, H. Wiesmann, C.-Y. Shih		1501

Impact Crater Deposit Production on Earth V. R. Oberbeck, H. Aggarwal		1502

Impacts, Flood Basalts, and Continental Breakup V. R. Oberbeck, J. R. Marshall		1788

First Results from the DLR Goniospectrophotometer A. Oehler, G. Neukum		1503

Melting and Shock Weakening Effects on Impact Crater Morphology J. D. O'Keefe, T. J. Ahrens		1504

Puenta del Zacate: First Occurrence of a Silicate Inclusion in a Type III Iron (But What Is It?) E. J. Olsen, A. M. Davis, C. B. Moore, R. N. Clayton, T. K. Mayeda, I. M. Steele		1505

Origin of Allende Chondrules H. Palme, B. Spettel, G. Kural, E. Zinner		1506

Ridge and Trough Terrain and the Origin of Miranda's Coronae R. Pappalardo, R. Greeley		1789

Single-Plate Rifting Model for Ridge and Trough Terrain on Icy Satellites R. Pappalardo, R. Greeley		1507

Radial Fracture Systems on Venus: Conditions of Formation E. A. Parfitt, J. W. Head		1790

A Survey of Radial Fracture Systems on Venus E. A. Parfitt, J. W. Head		1508

Preliminary Geologic Mapping of the MTM-55036 and 55043 Quadrangles, Southern Argyre Planitia, Mars T. J. Parker, D. S. Gorsline		1509

"Sourceless" Outflow Channels and STEM Valleys on Mars T. J. Parker, D. S. Gorsline		1510

Longitudinal Topographic Profiles of Very Long Channels in Venusian Plains Regions T. J. Parker, G. Komatsu, V. R. Baker		1511

Chemical Differentiation of a Convecting Planetary Interior: Consequences for One-Plate Planets such as Venus E. M. Parmentier, P. C. Hess		1512

Three Dimensional Thermal Convection at High Rayleigh Number; Implications for the Structure and Evolution of Planetary Interiors E. M. Parmentier, C. J. Sotin		1513

Thermodynamic Modelling of the Origin of the Divnoe Achondrite M. I. Pataev, A. A. Ariskin		1791

Steep-Sided Domes on Venus: Distribution, Associations, and Implications for Petrologic Models B. Pavri, J. W. Head, L. Wilson, B. Kluse		1514

Laboratory Studies of Analogs of Early Solar Nebula Condensed Objects D. Peak, S. J. Kusiak, B. Donn		1515

Interference Imaging of Plagioclase in Lunar Materials T. H. Pearce, C. Timms		1516

Evidence for Sorting Effects in the Regolith of the Kapoeta Parent Body A. Pedroni		1517

Solar Noble Gases in Mineral Separates of ACFER 111 A. Pedroni, F. Begemann, H. W. Weber		1518

244Pu Content of Phosphates and Cooling History of Acapulco Meteorite P. Pellas, C. Fieni		1519

Evolution of Earth's Noble Gases from Primordial Distributions: Consequences of Assuming Hydrodynamic Loss Driven by Giant Impact R. O. Pepin		1520

Inclusions in the Metal of Tieschitz and Krymka C. Perron, M. Bourot-Denise		1521

The Chicxulub Structure: Surface Manifestation and Possible Sulfur Isotope Signature E. C. Perry, D. J. Winter, B. Sagar, B. Wu		1522

The Divnoe Achondrite--VI. New Data on Bulk Chemistry M. I. Petaev, L. D. Barsukova, T. V. Shumskarya, T. V. Romashova, A. K. Galuzinskaya, M. I. Smoliar		1523

Vorotilovskaya Drillhole: First Deep Drilling in the Central Uplift of Large Terrestrial Impact Crater L. A. Pevzner, A. F. Kirjakiv, A. K. Vorontsov, V. L. Masaitis		1524

The Resurfacing History of Venus: Constraints from Impact Crater Distribution R. J. Phillips, R. R. Herrick, R. E. Grimm, R. F. Raubertas, I. C. Sarkar, R. E. Arvidson, N. Izenberg		1525

D's for Cr, Mn, and TI as Tests of Igneous vs. Subsolidus Equilibration of Mafic Minerals in Lunar Rocks W. C. Phinney		1526

Compositional Implications of SSI Multispectral Images of the Unexplored Lunar Farside C. M. Pieters, M. Belton, E. Fischer, R. Greeley, R. Jaumann, J. W. Head, H. Hoffmann, A. McEwen, S. Murchie, G. Neukum, J. Sunshine		1527

Spectral Properties of Agglutinate Separates from Soil 10084 C. M. Pieters, E. Fischer, J. Mustard, S. Pratt, A. Basu		1528

The Geophysical Signature of Terrestrial Impact Craters M. Pilkington, R. A. F. Grieve		1529

Detailed Spectro-Mixing Analysis of Copernicus Crater from High Resoultion Visible-Near Infrared Imaging Data P. C. Pinet, S. Chevrel, P. Martin		1530

High Resolution UV-Visible-Near Infrared Spectro-Imaging Data of Reiner Gamma Formation P. C. Pinet, S. Cheveral, V. V. Shevchenko		1531

Rheological Properties of Basaltic Lavas H. Pinkerton, R. J. Stevenson		1532

The Dynamics of Channel-Fed Lava Flows H. Pinkerton, L. Wilson		1533

Multiple Views of Venus: Geological Significance of Scattering Law Anomalies J. J. Plaut		1534

Compressive Stain Across Wrinkle Ridges in Arcadia Plaintia J. B. Plescia		1535

Recent Elysium Volcanism--Effects on the Martian Atmosphere J. B. Plescia, J. Crisp		1536

False-Positive Responses in "Getter" Simulations of Viking LR Results: Invalidation of that Evidence for Acidic Clay Minerals on Mars R. C. Plump, A. A. Scala, R. Tantayanon		1537

Reconstruction of Vesta Image Ye. A. Pluzhnik, F. P. Velichko		1538

Indenter Type Deformation on Venus as Evidence for Large-Scale Tectonic Slip, and Multiple Strike-Slip Events as a Mechanism for Producing Tesselated Terrain H. A. Pohn, G. G. Schaber		1539

Biospheric Effects of the Proposed Chicxulub K/T Bolide K. O. Pope, A. C. Ocampo		1540

Nd-Sr Isotopic Signature of the Pierre Shale: Target Material at the Manson Impact Site and Source of the Haitian Tektites (K-T Boundary)? W. R. Premo		1541

Acid Leaching of Apatite: Implications for U-Th-Pb Systematics of Lunar Highland Plutonic Rocks W. R. Premo, M. Tatsumoto		1542

U-Pb Isotopes in Dunites 72415 W. R. Premo, M. Tatsumoto		1543

Accretionary Wedge Mechanics on Venus: A Brittle/Ductile Critical Taper Model E. J. Price, C. Connors, F. A. Dahlen, J. Suppe, C. A. Williams		1544

Geologic Mapping of Part of Harmakhis Vallis Region, Mars: Evidence of Multiple Drainage Events K. H. Price		1545

ACFER 182/207: A New ALH85085-Type Chondrite and Its Implications M. Prinz, M. K. Weisberg		1546

S-Process SR and BA in SiC from Murchison Series KJ C. A. Prombo, F. A. Podosek, S. Amari, R. S. Lewis		1547

A Possible Mechanism of Gravity Relaxation on Venus A. A. Pronin, M. A. Kreslavsky		1548

Near Surface Soil-Gas Flow Due to Impact on Venus A. A. Provalov, B. A. Ivanov		1549

Clasts in Kapoeta: Implications for the Regolith Evolution of the HED Parent Body A. Pun, K. Keil, G. J. Taylor, R. Wieler, E. A. King		1550

A Comparison Between a "Unique" Eucrite Clast from the Kapoeta Howardite and the Pasamonte Eucrite A. Pun, C. K. Shearer, J. J. Papike		1551

The Chickulub Impact Structure: Shock Deformation and Target Composition J. M. Quezada Muneton, L. E. Marvin, V. L. Sharpton, G. Ryder		1552

Mass Spectrometric Observation of Organic Species in a Single IDP Thin Section F. Radicati di Brozolo, R. H. Fleming		1553

Neyterkob Coronae on Venus J. Raitala, K. Kauhanen		1554

The Linear "Un-Mixing" of Laboratory Thermal Infrared Spectra: Implications for the Thermal Emission Spectrometer (TES) Experiment, Mars Observer M. S. Ramsey, P. R. Christensen		1555

Geodynamic Signatures and Genesis of Anorthosite Massifs A. S. P. Rao, K. Srinivas		1556

A Search for Meteor Spectra from Meteor Showers Associated with S-type Near-Earth Asteroids K. L. Reed		1557

Solar-Proton Production of Neon and Argon R. C. Reedy		1558

Three New Chondrites from Namibia A. M. Reid, P. Jakes, M. E. Zolensky, R. Miller		1559

A Search for Large Impact Basins in the Southern Hemisphere of Mars II: South Polar B? A.-M. Reidy, C. A. Sandford, H. Frey, R. A. Schultz		1560

Pretoria Saltpan Impact Crater: Impact Glasses and Sulphide Spherules W. U. Reimold, C. Koeberl		1561

Kalkkop Crater in the Eastern Cape--A Good Candidate for an Impact Structure W. U. Reimold, R. A. F. Grieve, G. Levin		1562

A Magnetic Survey Across the Roter Kamm Impact Crater, Namibia W. U. Reimold, A. M. Reid, P. Jakes, M. E. Zolensky, R. Miller		1563

Significance of Komatiite: Thermal Emission Spectroscopy of Komatiite for Remote Sensing of Planetary Surfaces D. P. Reyes		1564

S-Process Isotope Anomalies: Neodymium, Samarium, and a Bit More of Strontium S. Richter, U. Ott, F. Begemann		1565

Measurement of Solar Wind Noble Gas Composition in Lunar Soils by In Vacuo Acid Etching P. E. Rider, R. H. Becker, R. O. Pepin		1566

Endothermic Reactions Constrain Dynamic Pyrometamorphic Temperatures in Two Iron-Rich Interplanetary Dust Particles F. J. M. Rietmeijer		1792

Interplanetary Dust Particle L20005T12 Directly Linked to Type CM Chondrite Petrogenesis F. J. M. Rietmeijer		1567

Petrogenesis of Kimberlites and Related Magmas A. E. Ringwood, W. Hibberson, N. Ware, S. E. Kesson		1568

Volcanism and Rifting Along the Northern Edge of Lada Terra, Venus K. M. Roberts, J. W. Head, M. G. Lancaster, J. E. Guest		1569

Ni-Rich Spinels in Micrometeorites and Meteorite Fusion Crusts E. Robin, Ph. Bont�, L. Froget, C. J�hanno, R. Rocchia		1793

On the Origin of Cretaceous-Tertiary Boundary Spinels E. Robin, Ph. Bont�, L. Froget, C. J�hanno, R. Rocchia		1570

Recent Volcanic Activity on Venus: Evidence from Emissivity Measurements C. A. Robinson, J. A. Wood		1571

Viking IRTM Analysis of Apollinaris Patera, Mars M. S. Robinson, J. R. Zimbelman		1572

Mariner 10 Color Images of the Eastern Limb and Farside of the Moon M. S. Robinson, P. G. Lucey, B. R. Hawke, G. A. Smith		1573

Statistics of Martian Craters Evidences for a Dense Atmosphere in the Past Zh. F. Rodionova		1574

Variable Size of the Crystallizing Boundary Layer During Formation of the Stillwater Layered Complex, Montana D. K. Ross, D. Elthon		1575

Channels and Basin Materials of Chryse and Acidalia Planitiae, Mars S. L. Rotto, K. L. Tanaka		1576

Chryse Planitia Region, Mars: A Summary of Geologic/Gemorphologic Mapping Results S. L. Rotto, K. L. Tanaka		1577

Analysis of Mars 1986 Seasonal South Polar CAP Spectrum T. L. Roush, R. B. Singer		1578

Analysis of Mariner 7 Thermal Infrared Spectra of Mars and Comparison to Recent Airborne Observations T. L. Roush, T. Z. Martin, J. B. Pollack		1579

Thermal Infrared Spectra (5.5-9.2a) of Mars Obtained from the Kuiper Airborne Observatory T. L. Roush, F. C. Witteborn, J. Bregman, D. Rank, A. Graps, J. B. Pollack		1580

Petrography of Metallic CU in Ordinary Chondrites A. E. Rubin		1581

Lineament Types as Evolutionary Stages for Development of Ridges/Scarps on Europa M. Rudnyk, D. Pieri		1582

Modelling Nitrogen Degassing in Chondrite Diamonds S. S. Russell, C. T. Pillinger		1583

Adrar 003: an Unequilibrated Ordinary Chondrite Rich in Pristine Interstellar Grains S. S. Russell, J. W. Arden, C. T. Pillinger		1584

Microfaulting of CAI Rim Layers and Relationships to the Fabric of the Leoville (CV3) Chondrite A. Ruzicka, W. V. Boynton		1585

Hydrocode Simulation of Explosive Disruption: External Pressure and Gravity E. V. Ryan, E. Asphaug, H. J. Melosh		1586

Lunar Highlands Totality from Bits and Pieces: A Whole-Rock-Chemistry-Free Characterization of an Evolved Hypabyssal Igneous Gabbro Schlieren from the Apollo 17 Landing Site G. Ryder		1587

The Size of Chondrule-forming Events D. L. Sahagian, R. H. Hewins		1588

Oceans on Mars: A Crater/Frequency Analysis by Elevation of the Northern Plains J. F. Lockwood		1589

New Chemical Mapping Technique for Analysis of Pyroxenes in Polymict Breccias and Application to Some Eucrites K. Saiki, A. Yamaguchi, H. Takeda		1794

Cooling of Ascending Magma on Venus and Earth S. E. H. Sakimoto, M. T. Zuber, B. D. Marsh		1590

The Role of Volume Scattering in Reducing Spectral Contrast of Reststrahlen Bands in Spectra of Powdered Minerals J. W. Salisbury, A. E. Wald		1591

The Detection of Methanol and Diamonds in Dense Molecular Clouds S. A. Sandford, L. J. Allamandola, A. G. G. M. Tielens, T. Herbst		1592

Is the Venusian Lithosphere Subducting? D. T. Sandwell, G. Schubert		1593

Science Questions for the Magellan Continuing Mission R. S. Saunders, E. R. Stofan		1594

The Uniform Distribution but Nonuniform Modification of Impact Craters on Venus G. G. Schaber, H. J. Moore, R. G. Strom, J. M. Boyce		1595

Volcanism on Triton P. Schenk		1596

An Unusual Thick Lava Flow in Ovda Regio, Venus P. Schenk, H. J. Moore		1597

The Simple-to-Complex Crater Transition on Venus P. Schenk, V. L. Sharpton		1598

Experiments of Investigate Atmospheric Effects on Crater Size R. M. Schmidt		1599

A Causal Relationship Between IR Peaking and Severe 13C Decline at the K/T Boundary R. A. Schmitt, D. S. Twining		1600

Volcanic Vents on Mars: Systematic Search and Classification B. Schneid, R. Greeley		1601

Mantle Dynamics and Tectonics on Venus G. Schubert		1602

Noble Gases in Metal and Silicates of the IIE Iron Meteorite Watson L. Schultz, H. W. Weber		1603

Impactor Signatures on Venus P. H. Schultz		1604

Wake-Blast Effects in Laboratory Experiments and on Venus P. H. Schultz		1605

On Surviving Atmospheric Entry P. H. Schultz, D. E. Gault		1606

Rio Cuarto Crater Field P. H. Schultz, J. Grant, W. Collins, J. P. Lopez, A. J. Toselli, T. G. Castellanos		1607

Limitations on the Applicability of Byerlee's Law and the Griffith Criterion to Shallow Crustal Conditions R. A. Schultz		1608

Progress on the Search for Strike-Slip Faulting on Venus R. A. Schultz		1609

What's the Difference Between a Rock and a Rock Mass (and Why Is It Important)? R. A. Schultz		1610

Growth of the Coprates Rise, Mars, as a Result of Lithospheric Folding R. A. Schultz, K. L. Tanaka		1611

Why are Strike-Slip Faults that are "Predicted" by Lithospheric Deformation Models Rarely Observed on Planetary Surfaces? R. A. Schultz, M. T. Zuber		1612

Preliminary Description of 60013, Bottom Half of Double Drive Tube 60014/60013 C. Schwarz		1613

Mars Highland Channels: an Age Reassessment D. H. Scott, J. M. Dohm		1614

Origin of Ureilites by Partial Melting and Explosive Volcanism on Carbon-Rich Asteroids E. R. D. Scott, K. Keil, G. J. Taylor		1795

Tidal Dissipation and the Giant Impact Origin for the Moon W. D. Sears		1615

Continued Investigation of the Impact Flux on the Long Duration Exposure Facility by the Meteoroid and Debris Special Investigation Group T. H. See, K. S. Mack, J. L. Warren, M. E. Zolensky		1616

Organic Compounds in Black Veins of Barbotan (H5) and Charsonville (H6) Chondrites V. P. Semenenko, N. V. Golovko		1617

Highly Porous Fragments in Saratov (L4) Ordinary Chondrite V. P. Semenenko, A. L. Girich, O. P. Sharkin		1618

Composition and Structure of Black Veins in Barbotan (H5) and Charsonville (H6) Chondrites V. P. Semenenko, G. M. Kolesov, A. Ljul		1619

Lunar Meteorite MAC 88105: Petrology of Igneous Rock Clasts A. S. Semenova, M. A. Nazarov, E. V. Guseva		1620

Regional Topographic Rises on Venus: Geology of Western Eistla Regio, Beta Regio, and Atla Regio D. A. Senske		1621

Zones of Extension and Rifting on Venus: Characteristics and Distribution D. A. Senske, J. W. Head		1622

Minor Element Variations in Plagioclase E. E. Shaffer, D. S. Burnett		1623

Terrestrial Subglacial Landforms as Analogs for Martian Landscapes J. Shaw, J. S. Kargel, R. G. Strom		1624

Trace Element Zoning and Subsolidus Microstructure of Pigeonite in the Zagami Shergottite C. K. Shearer, A. J. Brearley		1625

Intra-Crystalline Behavior of Trace Elements in Pyroxene from Mare Basalts with Different fO2-Crystallization Histories C. K. Shearer, J. J. Papike		1626

Origin of Olivine Diogenites and Their Relationship to Basaltic Magmatism on the Eucrite Parent Body C. K. Shearer, J. J. Papike		1627

Relationship Between Apollo 12 High-Ti, Red-Picritic Glass and High-Ti Basaltic Magmatism C. K. Shearer, J. J. Papike		1628

Development of a Backscatter Mossbauer Spectrometer (BaMs) for Planetary Applications T. D. Shelfer, M. M. Pimperl, E. L. Wills, D. G. Agresti, R. V. Morris		1629

Volume and Surface Scattering Properties of Lunar Lake Playa, Nevada M. K. Shepard, R. E. Arvidson, E. A. Guinness, D. W. Deering		1630

Major Element Chemistry of Apollo 14 Mare Basalt Clasts and Highland Plutonic Clasts from Lunar Breccia 14321: Comparison with Neutron Activiation Results J. W. Shervais, S. K. Vetter		1631

K-Ca Age of Lunar Granites C.-Y. Shih, H. Wiesmann, L. E. Nyquist		1632

Interference-Shadow Mechanism of the Negative Polarization for Metallic Powdered Surface (Preliminary Results) Yu. G. Shkuratov, A. S. Kachanov, G. Voylov, L. Ya. Melkumova, I. I. Latynina		1633

Stratigraphic Evidence from Western North America for Multiple Impacts at the K/T Boundary E. M. Shoemaker, G. A. Lzett		1634

First Evidence for Live 60Fe in the Early Solar System A. Shukolyukov, G. W. Lugmair		1635

Noble Gases in the Omolon Pallasite A. Shukolyukov, M. I. Petaev		1636

Petrography, Composition and Origin of Chromian Spinel Crystals Separated from the Murchison Meteorite S. B. Simon, L. Grossman		1637

Scattering Properties of Venus' Surface R. A. Simpson, G. L. Tyler, M. J. Maurer, E. Holmann		1638

Composition of the Martian Crust: Evidence from Spectroscopy and SNC Meteorites R. B. Singer, H. Y. McSween Jr.		1639

Cross Section Measurements for the Production of Carbon-14 and Beryllium-10: Improved Estimates for Cosmogenic Nuclide Production Rates J. M. Sisterson, A. M. Koehler, A. J. T. Jull, D. J. Donahue, L. McHargue, R. C. Reedy, P. A. J. Englert		1640

Venus Gravity: Status and New Data Acquisitions W. L. Sjogren		1641

Glasses, Glassy Inclusions and Chondrules in the Kaidun Meteorite Ya. A. Skripnik, K. I. Ignatenko, N. N. Kononkova, A. V. Ivanov		1642

Energy Partitioning and Ejecta Escape for Normal and Oblique Impacts on Self Gravitating Planetary Systems C. L. Smither, T. J. Ahrens		1643

Tectonic Implications of Gravitational Spreading Models for Ishtar Terra, Venus S. E. Smrekar, S. C. Solomon		1644

Hydrous Silicates in the Upper Mantles of Terrestrial Planets J. R. Smyth, T. C. McCormick		1645

Large-Scale Convective Overturn of the Lunar Upper Mantle: Fact or Fancy? G. A. Snyder, L. A. Taylor		1646

Isotopic Constraints on the Lunar Upper Mantle: Evidence from High-Ti Basalts G. A. Snyder, E. A. Jerde, L. A. Taylor, D.-C. Lee, A. N. Halliday		1647

Nd and SR Isotopic Constraints on High-Ti Basalt Volcaniosm at Mare Tranquillitatis G. A. Snyder, D.-C. Lee, L. A. Taylor, E. A. Jerde, A. N. Halliday		1648

Zircon/Melt Partition Coefficients for the Rare-Earth Elements in Evolved Rocks: The Usefulness of Accessory Minerals in Petrogenetic Studies on the Earth and Moon G. A. Snyder, L. A. Taylor, G. Crozaz		1649

Combined Equilibrium and Fractional Crystallization of a Magma Ocean and Formation of the Upper Mantle of the Moon G. A. Snyder, L. A. Taylor, C. R. Neal		1650

Carbon Isotopic Composition of Precambrian Sediments Extracted by Stepped Combustion R. A. Socki, C. S. Romanek, E. K. Gibson Jr., D. R. Stewart		1651

Surface Effects of Impacts into Venus'Atmosphere L. A. Soderblom, D. J. Chadwick, G. G. Schaber		1652

Comparison of Lunar and Terrestrial Magma Oceans V. S. Solomatov, D. J. Stevenson		1653

Venus Tectonics: an Overview of Magellan Observations S. C. Solomon, S. E. Smrekar, D. L. Bindschadler, R. E. Grimm, W. M. Kaula, G. E. McGill, R. J. Phillips, R. S. Saunders, G. Schubert		1654

Topography of Tharsis Mons (Mars) Deduced from the ISM Experiment: Comparison with Radar Profiles C. Sotin, S. Smrekar, Y. Rosenqvist, J. P. Bibring		1655

Calorimetric "Weatherometer" for Stony Meteorites C. S. Spargur, J. L. Gooding		1796

ICP-MS Trace Element Analysis of Ureilites: Evidence for Mixing of Distinct Components A. H. Spitz		1656

Statistical Comparisons of Antarctic and Non-Antarctic Ureilites A. H. Spitz		1657

The Moon: Mid-Infrared (7.5-11.4 am) Spectroscopy of Five Selected Regions A. L. Sprague, F. C. Witteborn, R. W. H. Kozlowski, D. P. Cruikshank		1658

Geology and Deposits of the Humorum Basin P. D. Spudis, B. R. Hawke, P. G. Lucey, G. J. Taylor, C. Peterson		1797

High Resolution Lunar Radar Studies--Preliminary Results N. J. S. Stacy, D. B. Campbell, P. G. Ford		1659

Longitudinal Variations of the Linear Polarization in Jupiter's Polar Regions O. M. Starodubtseva, L. A. Akimov, V. V. Korochin, V. G. Teifel		1660

Estimation of Solar-Flare-Induced Variation of Albedo for Atmosphereless Cosmic Bodies L. V. Starukhina, Yu. G. Shkuratov		1661

Olivine Zoning as Function of Crystallographic Orientation; Implications for Diffusion in Olivine I. M. Steele		1662

Crystal Structure of Natural Stanfieldite from the Imilac Pallasite I. M. Steele, E. Olsen		1663

TOF-SIMS Analysis of LDEF Impact Residues T. Stephan, F. J. Stadermann, H.-G. Cramer, J. Zehnpfenning		1664

Criteria for Magnetic Fields Regeneration in Accretion Disk Models of the Solar Nebula T. F. Stepinski		1665

On the Generation of Magnetic Fields in the Solar Nebula at the Location of the Present-Day Asteroid Belt T. F. Stepinski, E. H. Levy		1666

Imaging Detection of Atmospheric Sodium over the Lunar Terminator S. A. Stern		1667

Sm-Nd Chronology and Petrochemistry of Mesosiderites B. W. Steward, D. A. Papanastassiou, G. J. Wasserburg		1668

Generalized Theory for Planetesimal Dynamics G. R. Stewart		1669

Geologic Settings of Aeolian Features on Venus E. R. Stofan, J. J. Plaut, R. Greeley, R. A. Arvidson, C. Elachi, M. A. Geringer, R. S. Saunders, G. Schubert, S. D. Wall, C. M. Weitz		1670

High Latitude Radar-Dark Parabolic Markings on Venus P. J. Stooke		1671

Microtektite Hunting and Mineral Wool Shot D. Storzer		1672

A Kinetic Study of the Conversion of Hematite to Magnetite with Applications to the Metastability of Hematite on Venus D. W. Straub, R. G. Burns		1673

Physical Properties of Deucalionis, Eos, and Xanthe-type Units in the Central Equatorial Region of Mars E. L. Strickland III		1674

Global Resurfacing of Venus R. G. Strom, G. G. Schaber, J. Arkani-Hamed, M. N. Toksoz		1675

The EPR Study of Impact Diamonds from Astroblemes S. N. Suchardjevskiy, G. I. Shafranovskii, E. L. Balmasov		1676

Topographic Evolution of the Moon by Impacts During Heavy Bombardment S. Sugita, T. Matsui		1677

Three-Dimensional Stability Back-Analysis of Small Martian Avalanche Chutes R. Sullivan		1678

Oceanus Procellarum as Viewed by Galileo: Evidence for Compositional Diversity in the Mare Deposits and at the Marius Hills Plateau J. M. Sunshine, C. M. Pieters, J. W. Head, A. S. McEwen, R. Greeley		1679

Linear Mountain Belts and Related Deformation on Venus J. Suppe, C. Connors		1680

Antarctic Micrometeorites: Trace Element Contents and Textures of 50 to 100 microns Particles S. R. Sutton, M. Prinz, M. Maurette, C. E. Nehru, M. K. Weisberg, S. Bajt		1681

Computed Microtomography (CMT) of Extraterrestrial Objects Using a Linear Photodiode Array Detector S. R. Sutton, P. Spanne, M. L. Rivers, K. W. Jones		1682

Systematic Variations in Solar Wind Fluence with Lunar Location: Implications for Abundances of Solar-Wind-Implanted Volatiles T. D. Swindle, M. K. Burkland, J. R. Johnson, S. M. Larson, R. V. Morris, B. Rizk, R. B. Singer		1683

Chemical Compositions of Fremdlinge from a Type A Allende Inclusion P. J. Sylvester, S. B. Simon, L. Grossman		1684

A Model for the Internal Temperature Distribution of Micrometeorites During Atmospheric Entry Heating P. P. Szydlik, G. J. Flynn		1685

Atmospheric Effect on Cratering on Venus T. Takata, T. J. Ahrens, R. J. Phillips		1686

Mineralogy of a New Orthopyroxene-bearing Ureilite LEW88201 and the Relationship Between Magnesian Ureilities and Lodranites H. Takeda, T. Baba, H. Mori, J. Saito		1687

Mineralogy and Cooling Histories of Lunar Granulites and Related Lunar Meteorites H. Takeda, M. Miyamoto, H. Mori		1688

Experimental and Theoretical Analyses of Hypervelocity Penetration Parameters for Thin Films Flown in Space W. G. Tanner, R. A. McDonald, W. M. Alexander, C. R. Maag		1689

Elemental Distribution of U, Th, and PB in Peridotite Xenoliths: Implications for the PB Isotopic Evolution of the Moon M. Tatsumoto, Y. Nakamura, W. R. Premo, F. R. Boyd		1690

An Ilmenite Feedstock on the Moon: Beneficiation of Rocks Versus Soil L. A. Taylor, D. S. McKay		1691

Diamondiferous Eclogites from Yakutia, Siberia: Evidence for the Evolution of Cratons L. A. Taylor, E. A. Jerde, G. Crozaz, N. V. Sobolev, V. N. Sobolev		1692

Magnetic Beneficiation of High-Ti Mare Basalts: Petrographic Analyses L. A. Taylor, D. S. McKay, J. Graf, A. Patchen, S. Wentworth, R. Oder, E. Jerde		1693

The Experience of the Mars Normal Albedo and Limb Darkening Coefficients Mapping from the Observations During 1990 Opposition V. G. Tejfel, N. V. Sinyaeva, A. N. Aksenov, G. A. Kharitonova		1694

Fractionation Trends During Impact Comminution of Modally Controlled Regoliths A. M. Therriault, F. Hoerz, M. J. Cintala, F. Cardenas, G. L. Haynes		1695

Artificial "Regolith" of an Ice-Dust Body Under Space Conditions: Dust Mantle Dynamics and Phenomenology During KOSI 9 K. Thiel, E. Gruen, J. Gebhard, G. Kolzer		1696

Mass Independent Isotope Effects: Recent Advances and Application to the Pre-Solar Nebula and Stratosphere M. H. Thiemens		1697

Carbon in Anhydrous Interplanetary Dust Particles: Correlations with Silicate Mineralogy and Sources of Anhydrous IDPS K. L. Thomas, L. P. Keller, G. Blanford, W. Kloeck, D. S. McKay		1698

Bulk Compositions, Mineralogy, and Trace Element Abundances of Six Interplanetary Dust Particles K. L. Thomas, L. P. Keller, G. J. Flynn, S. R. Sutton, K. Takatori, D. S. McKay		1699

Gaspra's Shape and Surface Features: Comparison with Small Satellites P. C. Thomas, M. E. Davies, D. Simonelli, J. Veverka, M. Belton, The Galileo Imaging Team		1700

Mars Quasi-Specular Echoes: Preliminary Results at 3.5-cm Wavelength T. W. Thompson, T. C. O'Brien, R. F. Jurgens, M. A. Slade, H. J. Moore		1701

Comparison of Automatically Generated DEM of Tithonium Chasma with USGS Interpolated Contour DEM G. D. Thornhill, J. B. Murray, D. A. Rothery, T. Day, A. C. Cook, J. C. Iliffe, J. P. Muller		1702

Distribution of Materials Excavated by the Lunar Crater Bullialdus: A Spectral Mixing Analysis S. Tompkins, C. M. Pieters, J. F. Mustard, P. Pinet		1703

Magma Ocean Formation Due to Giant Impacts: The Effect of the Planet's Thermal State Before the Collision W. B. Tonks, H. J. Melosh		1704

Geomorphic/Geologic Map of Audra Planitia Region on Venus Based on Magellan Radar image Mosaic CI-MIDR.60N070;1 T. Tormaenen		1705

Tectonics of Southwestern Audra Planitia on Venus from Magellan Data: Evidence of Underthrusting T. Tormaenen, J. Raitala		1706

The Natural Thermoluminescence of Meteorites with High Al26 Contents: Unusual Orbital Histories in Ordinary Chondrites? S. G. Traub-Metlay, P. H. Benoit		1707

Establishment of a Thermoluminescence Facility at the University of Pittsburgh S. G. Traub-Metlay, P. H. Benoit, W. Cassidy		1708

The Parent Magma of the Nakhla (SNC) Meteorite: Constraints from Magmatic Inclusions in Olivine A. H. Treiman		1709

A New Ureilite: Preliminary Data on Nuevo Mercurio (B) A. H. Treiman, J. L. Berkley		1710

The Lafayette Meteorite: Preterrestrial Aqueous Alterations A. H. Treiman, R. A. Barrett, J. L. Gooding		1711

Effects of Aerogel Density on Intact Capture P. Tsou, A. L. Albee		1712

Response and Transmission Characteristics of Thin PVDF Copolymer Dust Detectors A. J. Tuzzolino		1713

Organic Mass Spectra of Shocked Murchison Meteorite J. A. Tyburczy, T. N. Tingle, T. J. Ahrens, C. H. Becker		1714

Geologic Mapping, Claritas Fossae Region, Mars: Progress Report J. R. Underwood Jr.		1715

On the Production of 26Al in the Supernova Shell G. K. Ustinova, A. K. Lavrukhina		1716

Palagonites and Martian Soil Simulants D. T. Vaniman, G. Heiken, K. Wohletz, J. Blacic		1717

Spectral Properties of CR Substituted Goethites and Hematities R. K. Vempati, R. V. Morris, H. V. Lauer Jr.		1718

Carbon, Nitrogen and Noble Gases in Diamond-rich Residues of the Efremovka CV3 Chondrite A. B. Verchovsky, U. Ott, S. S. Russell, C. T. Pillinger, A. V. Fisenko, Yu. A. Shukolyukov		1719

Collisional Model for Turbulent and Molecular Processes in Preplanetary Disk M. Verronen, H. Vanhala		1720

Whole Rock Major Element Chemistry of KREEP Basalt Clasts in Lunar Breccia 15205: Implications for the Petrogenesis of Volcanic KREEP Basalts S. K. Vetter, J. W. Shervais		1721

Ejecta Associated with Large Terrestrial Impacts: Implications for the Chicxulub Impact and K/T Boundary Stratigraphy A. M. Vickery, D. A. Kring, H. J. Melosh		1722

Volatiles, Their Ices and Clathrates in Early Solar Nebula A. V. Vityazev, G. V. Pechernikova, Yu. F. Makogon		1723

Cosmogenic Nuclides in the H3 Chondrite Dhajala S. Vogt, G. F. Herzog, D. Fink, J. Klein, R. Middleton		1724

Venus Degassing Model in K-Ar System V. P. Volkov, M. Ya. Frenkel		1725

Science Rationable for a Discovery Program Venus Atmospheric Probe Mission R. W. Vorder Bruegge		1726

REE in Minerals in Nakhla and Lafayette: A Comparative Study of Trace Element Microdistributions M. Wadhwa, G. Crozaz		1727

Angular Dependence of Spectral Emissivity of Quartz and Basalt A. E. Wald, J. W. Salisbury		1728

Rhenium-Osmium Isotope Sytematics in Chondrites and Iron Meteorites R. J. Walker, J. W. Morgan, M. F. Horan, J. N. Grossman, R. S. Clarke		1729

Volatiles on Mars: The Role of SO2 H. Waenke, G. Dreibus, E. Jagoutz, L. M. Mukhin		1730

Coorbital Corotation Torque W. R. Ward		1731

A Compilation of Key Petrologic Information on Pristine Nonmare Moon Rocks P. H. Warren		1732

Inheritance of Magma Ocean Differentiation Through Lunar Origin by Giant Impact P. H. Warren		1733

Ureilites: The Graphite f(O2) Buffer, Explosive Volcanism, and the Gross Dissipation of Basalt from the Parent Asteroid(s) P. H. Warren, G. W. Kallemeyn		1734

Oxidizing Conditions in the Solar Nebula and the Origin of Chromite Chondrules J. T. Wasson, A. N. Krot		1735

A Globally Distributed Compressional Ridge System on Mars? T. R. Watters		1736

Impact Effects and Optical Scatter A. J. Watts, D. R. Atkinson, L. B. Crowell, C. R. Coombs		1737

Mineralogy and Chemistry of Refractory Inclusions in CR-like Chondrites from the Sahara Desert D. Weber, A. Bischoff		1738

Multizone Simulations of Planetary Accretion: Effects of Distant Perturbations S. J. Weidenschilling, D. R. Davis		1739

FEO-rich Silicates and Reduction Processes in the Unequilibrated Enstatite Chondrites M. K. Weisberg, R. A. Fogel, M. Prinz		1740

Two Possible Dune Fields on Venus C. M. Weitz, C. Elachi, R. Blom, R. Greeley		1741

Low-Emissivity Impact Craters on Venus C. M. Weitz, H. J. Moore, G. G. Schaber		1742

Investigation of Venusian Pyroclastic Volcanism M. L. Wenrich, R. Greeley		1743

Apollo 12 Ropy Glasses Revisited S. J. Wentworth, D. S. McKay, D. D. Bogard		1744

Simultaneous Growth and Orbital Evolution of Terrestrial and Asteroidal Embryos G. W. Wetherill		1745

Distribution of Lithospheric Failure and Volcanism in the Lunar Crisium Basin: Additional Signatures of an Oblique Multi-Ring Impact Structure R. W. Wichman, P. H. Schultz		1746

Morphologic Mapping of the Region from Northern Ovda Regio to Southern Tellus Regio, Venus M. A. Wieczorek, M. J. Tatsumura, I. A. Leyva, K. Desmairis, J. Johnson, L. Koopowitz, R. Landheim, D. L. Bindschadler		1747

Krypton and Xenon from Solar Energetic Particles in a Lunar Ilmenite R. Wieler, H. Bauer, P. Signer		1748

Automated Detection and Measurements of Small Volcanoes on Venus C. R. Wiles, M. R. B. Forshaw		1749

Lunar Farside Mare Deposits: Latest Galileo Imaging Results D. A. Williams, R. Greeley		1750

Growth and Thermal Evolution of Planetesimals D. R. Williams, G. W. Wetherill, G. R. Stewart		1751

Magma Reservoirs and Neutral Buoyancy Zones on Venus: Implications for the Formation and Evolution of Volcanic Landforms L. Wilson, J. W. Head		1752

The Antineutrino Luminosity of the Moon T. L. Wilson		1753

An Earth-Moon Baseline Neutrino Experiment T. L. Wilson		1754

Is There a Standard Model of the Moon? T. L. Wilson		1755

The Moon as a Scientific Laboratory T. L. Wilson		1756

Neutrino Astronomy of the Moon T. L. Wilson		1757

Compositional Differences Among Antarctic Populations: Discriminant Analysis of H Chondrites from Victoria Land and Queen Maud Land S. F. Wolf, M. E. Lipschutz		1758

Discovery of Planets Around a Millisecond Pulsar A. Wolszczan		1759

After Magellan: Concepts for the Next Generation of Venus Spacecraft C. A. Wood, G. Blount		1760

Venus: Surface Chemistry and Modification Processes J. A. Wood		1761

An Investigation of the Carbon in Different Lithologies of Zagami I. P. Wright, C. T. Pillinger, M. M. Grady		1762

Carbonaceous Chondrites: Co-Variation of Volatile Element Contents and Siderophile Element Ratios in Petrographic Types 2-6 X. Xiao, M. E. Lipschutz		1763

Shock Vaporization of Granites: Experimental Results O. I. Yakovlev, Yu. P. Dikov, M. V. Gerasimov		1764

Bulk Composition of Yamato-793575 Classified as Carlisle Lakes-type Chondrite K. Yanai		1765

Silicate Jet Ejecta Mass and Geometry upon Oblique Impact W. Yang, T. J. Ahrens		1766

A Frost Model for Pluto's Surface: Implications for Pluto's Atmosphere E. F. Yound, R. P. Binzel, S. A. Stern		1767

Airburst Origin of Dark Shadows on Venus K. J. Zahnle		1768

Erosion of the Martian Atmosphere on Plasma Measurements A. V. Zakharov		1769

Inclusions in the Metal of ALH85085: New Clues to a Condensation Origin B. Zanda		1770

Linear and Weakly Non-Linear Variable Viscosity Convection in Spherical Shells A. Zebib		1771

The Effect of Target Properties on Cratering Mechanism E. V. Zenchenko, V. M. Tsvetkov		1772

The Spectra of Chemisorbed CO2 on Mars Analog Materials A. P. Zent, T. L. Roush		1773

Coupled Subsurface Atmosphere Boundary Layer Model of H2O on Mars: Sensitivity Studies A. P. Zent, R. M. Haberle, H. Houben, B. M. Jakosky		1774

Late-Stage Effusion and Mass-Wasting on Ascraeus Mons Volcano, Mars J. R. Zimbelman		1775

Volcanic and Modified Landforms on the Tharsis Montes, Mars J. R. Zimbelman, K. S. Edgett		1776

New Data on the Chondrite "Tuan TUC (L5-6)" N. G. Zinovieva, O. B. Mitreikina, L. B. Granovsky		1777

Thermal History of the Acapulco Meteorite J. Zipfel, A. K. Kennedy, I. D. Hutcheon, B. Spettel, H. Palme		1778

Mineralogy of Dark Clasts in CT Chondrites, Encrites and Howardites M. E. Zolensky, M. K. Weisberg, P. C. Buchanan, M. Prinz, A. Reid, R. A. Barrett		1779

A Model of the Physico-Chemical Evolution of the Venus Atmosphere as a Result of Volcanic CO2 Degassing M. Yu. Zolotov		1780

Pyrite-Magnetite or Magnetite-Hematite Mineral Assemblages as a Possible Buffer of the Composition of the Venus Atmosphere M. Yu. Zolotov		1781

Should Lithospheric Flexure Due to the Load of the Martian Polar Layered Deposits be Detectable with the Mars Observer Laser Altimeter? M. T. Zuber		1782

The Contribution of Dynamic Topography Due to Lithosphere Compression to the Structure of Mountain Belts and Ridge Belts on Venus M. T. Zuber, E. M. Parmentier		1783

23st Lunar and Planetary Science Conference

TABLE OF CONTENTS