26st Lunar and Planetary Science Conference

		no.

The Clementine SPICE Archive C. H. Acton		1001

Near Earth Asteroid Rendezvous Magnetometer (MAG) Investigation M. Acuna, L. Zanetti, C. Russell		1002

Crystal-Liquid Density Inversions in High-TiO2 Lunar Basalt C. B. Agee, S. Circone		1003

A Mossbauer Investigation of Hot Springs Iron Deposits D. G. Agresti, T. J. Wdowiak, M. L. Wade, L. P. Armendarez, J. D. Farmer		1004

Georgia Tektites: Stratigraphic Occurrence Revisited E. F. Albin		1005

New Major-Element Abundances and Interelement Correlations for Georgia Tektites E. F. Albin, M. F. Roden		1006

Trace Elements, Al26 and Be10, and Noble Gases in Lunar Rock 14286 A. Albrecht, G. F. Herzog, J. Klein, R. Middleton, L. Schultz, H. W. Weber, G. W. Kallemeyn, P. H. Warren		1007

Formation of Chondrules by Recycling and Volatile Loss C. M. O'd. Alexander		1008

Adventures in Space and Atmosphere Science W. M. Alexander, G. E. Schaub, S. R. Smith		1009

Catastrophe in the Space: 500 or 300 MYR Ago? V. A. Alexeev		1010

Radioactivity of Dengli Meteorite V. A. Alexeev, V. D. Gorin		1011

Some Regularities of Cosmic-Ray Exposure Age Distribution of H-Chondrites of Different Shock Classes V. A. Alexeev, N. S. Kuyunko		1012

Effects of Cosmic Ray Variations in Radioactivity of Meteorites with Different Exposure Ages V. A. Alexeev, G. K. Ustinova		1013

Who Needs a Few More Mars Samples When We Already Have the SNCs? C. C. Allen, A. H. Treiman		1014

Oxygen Production from Lunar Soils C. C. Allen, R. V. Morris, D. S. McKay		1015

A Case for Sterile Sample Return from Mars: Alternative to Quarantine J. H. Allton		1016

The Internet as a Medium for Public Debate on the Issue of Returning to the Moon B. Altner, A. Kochhar, D. Brandt		1017

Emplacement of K/T-Boundary Shocked Quartz from Chicxulub Crater W. Alvarez, P. Claeys, S. W. Kieffer		1018

Ti44 in Interstellar Grains from the Murchison Meteorite S. Amari, E. Zinner, R. S. Lewis, S. E. Woosley		1019

Crustal Thickness Variations at Valles Marineris, Mars F. S. Anderson, R. E. Grimm		1020

An Analytical Approach to Identifying Radial Lineaments Associated with the Tharsis Region of Mars R. C. Anderson, B. J. Peer		1021

Preliminary Investigation of Shocked Grains (Manson Ejecta?), Paleontology, and Depositional Features in the Crow Creek Member, Pierre Shale (Upper Cretaceous) of Southeastern South Dakota and Northeastern Nebraska, and Its Effect on Upper Cretaceous Bio R. R. Anderson, B. J. Witzke, R. H. Hammond, D. K. Watkins		1022

Model for Penetration of Surficial Materials by a Coring Projectile W. W. Anderson, T. J. Ahrens, R. F. Scott		1023

Estimates of Cryptomare Thickness and Volume in Schiller-Schickard, Mare Humorum and Oceanus Procellarum Areas I. Antonenko, J. W. Head		1024

Oxygen Production from Carbon Dioxide by Zirconia Electrolysis K. Araghi		1025

Exotic Components in Lunar Breccia Yamato 793274 T. Arai, H. Takeda		1026

Reflectance Spectroscopy of Palagonite, Aluminous Phyllosilicate, Glass and Ferric Oxide Mixtures: Implications for Surface Composition of Bright Martian Soil G. Arnold, J. Bishop, U. Schade, R. Wasch		1027

The Tidal Evolution of Strengthless Planetesimals E. Asphaug, W. Benz		1028

Noble Gases in the Chondrites E1 Djouf 001 (CR) and ACFER 214 (CR-like): Evidence for Possible Redistribution of Gases S. S. Assonov, M. A. Ivanova, Yu. A. Shukolyukov		1029

Stratigraphy of Small Volcanoes and Plains Terrain in Vellamo Planitia-Shimti Tessera Region, Venus J. C. Aubele		1030

Locating Small Volcanoes on Venus Using a Scientist-Trainable Analysis System J. C. Aubele, L. S. Crumpler, U. M. Fayyad, P. Smyth, M. C. Burl, P. Perona		1031

Shock Behavior of Calcite, Anhydrite, and Gypsum D. D. Badjukov, Yu. P. Dikov, T. L. Petrova, S. V. Pershin		1032

Impact-induced Redox Reactions of Silicates with Metal Iron D. D. Badjukov, T. L. Petrova, S. V. Pershin		1033

Comparison of Fe Oxidation States in Interplanetary Dust Particles and Matrix Fragments of Primitive Chondrites S. Bajt, G. J. Flynn, S. R. Sutton, W. Kloeck		1034

A Stochastic Approach to the Emplacement of Pahoehoe Lava Flows S. M. Baloga, D. A. Crown		1035

An Ultra-Broad-Band Seismic System for Exploring the Interior of Mars W. B. Banerdt, P. Lognonne, T. Pike, W. Kaiser, J. F. Karczewski, S. Cacho, C. Cavoit, N. Striebig		1036

Degradation Studies of Impact Craters in the Mangala Valles Region of Mars N. G. Barlow		1037

Laboratory Clues to the Emplacement of Distal Ejecta Deposits by Atmospheric Processes O. S. Barnouin, P. H. Schultz		1038

Numerical Simulation of Scattering from Small-scale Surface Structure J. E. Baron, G. L. Tyler, R. A. Simpson		1039

Compositional Heterogeneity and Late-Stage Deformation in Maxwell Montes, Venus A. T. Basilevsky		1040

Stratigraphic Studies in the Area of Baltis Vallis, Venus A. T. Basilevsky, J. W. Head		1041

Variations of the Ferromagnetic Resonance Index (Is/FeO) of Individual Agglutinates A. Basu, D. S. McKay, R. V. Morris, S. Wentworth		1042

Fullerenes in the K/T Boundary: Are They a Result of Global Wildfires? L. Becker, J. L. Bada, T. E. Bunch		1043

PAHs, Fullerenes and Fulleranes in the Allende Meteorite L. Becker, J. L. Bada, T. E. Bunch		1044

An Evaluation of Possible Explanations for 'Excess' Nitrogen in the Lunar Regolith R. H. Becker		1045

Mineralogy of Micrometeorites from Greenland and Antarctica: Indications for Their Asteroidal Origin W. Beckerling, A. Bischoff		1046

Q-class Asteroids and Ordinary Chondrites J. F. Bell		1047

Mars Surface Mineralogy from Hubble Space Telescope Multispectral Imaging: 1994 Pre-opposition Data J. F. Bell III, P. B. James, L. J. Martin, R. T. Clancy, S. W. Lee, D. Crisp		1048

Imaging Spectroscopy of the Moon in the Mid-Infrared: 8.3 to 13.3 microns Image Cubes of TYCHO J. F. Bell III, P. G. Lucey, D. T. Blewett, B. R. Hawke, M. S. Robinson, T. L. Roush, J. D. Bregman, D. M. Rank, D. Harker, P. Temi		1049

Textural and Mineralogical Variations in Winonaites: Clues to the History of the IAB Iron-Winonaite Parent Body G. K. Benedix, T. J. McCoy, K. Keil		1050

An Internal Heating Model for the L Chondrite Asteroidal Parent Body M. E. Bennett III, H. Y. McSween Jr.		1051

The Use of Lunar Soil for Non-Critical Radiation Dosimetry for Robotic Rovers P. H. Benoit, D. W. G. Sears		1052

The CV Chondrites: Metamorphism, Thermal History, and Their Relationship to CK Chondrites P. H. Benoit, S. J. K. Symes, R. K. Guimon, D. W. G. Sears		1053

On the Nature of Carbon Cores in Interstellar Graphite T. J. Bernatowicz, P. C. Gibbons, S. Amari, R. S. Lewis		1054

Depth/Diameter Ratios of LDEF Microcraters: Implications for Physical Properties of Natural and Orbital Debris Particles R. P. Bernhard, B. J. Hannigan, F. Hoerz		1055

An Experimental Study of the Internal Structure of Mars C. M. Bertka, Y. Fei		1056

Infrared Reflectance Spectra of Selected Lunar Soils and Mineral Concentrates B. H. Betts, D. B. Nash		1057

Planetary Science Education: The SJI Program B. H. Betts, A. Bormanis, R. Kenealy, D. B. Nash		1058

Isotropy of Gravity and Topography on the Earth, Moon, Mars and Venus B. G. Bills, F. G. Lemoine		1059

The Venus Hypermap: Hypermedia Education and Publication Via the World Wide Web D. L. Bindschadler, W. B. Moore		1060

The Evidence of Multistage Origin of the Fine-Grained Refractory Inclusions in the Carbonaceous Chondrites V. V. Birjukov, A. A. Ulyanov		1061

Reflectance and Emittance Spectroscopy of Ferrihydrite-bearing and Ferric Sulfate-bearing Montmorillonites as Mars Soil Analogs J. L. Bishop		1062

The Metastable Persistence of Vapor-deposited Amorphous Ice at Anomalously High Temperatures D. F. Blake, P. Jenniskens		1063

Clementine: On-Board Image Compression J. Blamont, C. Lambert-Nebout		1064

Meteorites as Indicators of Paleoclimatic Conditions P. A. Bland, F. J. Berry, C. T. Pillinger		1065

Variation of Weathering with Depth: A Comparison Between the Great Bend Meteorite and LEW 85319 P. A. Bland, F. J. Berry, C. T. Pillinger		1066

Weathering Effects in the Axtell, CV3 Carbonaceous Chondrite P. A. Bland, F. J. Berry, C. T. Pillinger		1067

The Infrared Distribution on SO2 Frost on Io: The Effect of Thermal Emission on the Estimation of Frost Abundances D. L. Blaney, M. S. Hanner, R. Russell, D. Lynch, J. Hackwell		1068

Exploring the Crisium Region with Multispectral Imagery D. T. Blewett, B. R. Hawke, P. G. Lucey, P. D. Spudis		1069

Radar Imaging of Impact Craters by SIR-C/X-SAR D. G. Blumberg, J. F. McHone, R. Kuzmin, R. Greeley		1070

Ar39 Ar40 Ages of Two Shocked L Chondrites D. D. Bogard		1071

Exposure-Age-Initiating Events for Martian Meteorites: Three or Four? D. D. Bogard		1072

Distinguishing Between Shock and Tectonic Lamellae with the SEM B. F. Bohor, D. K. Fisler, A. J. Gratz		1073

Metal/Silicate/Sulfide Partitioning of Highly Siderophile Elements (HSE) as Derived from Recent Solubility Data A. Borisov, H. Palme		1074

NMR Spectroscopy of Quartz from the K/T Boundary: Shock-induced Peak Broadening, Dense Glass, and Coesite M. B. Boslough, R. T. Cygan, G. A. Izett		1075

Thermal Profiles in Protoplanetary Disks A. P. Boss		1076

Binary Asteroids: Progenitors of Doublet Craters W. F. Bottke Jr., H. J. Melosh		1077

Implications of Small-scale Fracturing on Guinevere Planitia, Venus D. D. Bowman, C. G. Sammis		1078

Dielectric Properties of Venusian Impact Craters and Associated Deposits R. A. Brackett		1079

GEMS and Interstellar Silicate Grains J. P. Bradley		1080

Reflectance Spectra (from 380-800 Nanometers) of Interplanetary Dust Particles J. P. Bradley, D. E. Brownlee, L. P. Keller		1081

A Candidate Spreading Center in Western Atla Regio, Venus G. R. Brakenridge		1082

I-Xe Chronometry: Crock or Clock? A Program to Test and Interpret the I-Xe System R. H. Brazzle, K. Kehm, C. M. Hohenberg, C. Gopel, T. D. Swindle, A. M. Davis, G. MacPherson		1083

Light Lithophile Element (Li, Be, B) Abundances in Microchondrules in CH Chondrites: Insights into Volatile Behavior During Chondrule Formation A. J. Brearley, G. D. Layne		1084

Distribution of Moderately Volatile Trace Elements in Fine-grained Chondrule Rims of Metamorphosed CO3 Chondrites A. J. Brearley, S. Bajt, S. R. Sutton		1085

Elevation Distribution, Diameter, Morphology of Small Volcanic Edifices on Venus Between Guinevere Planitia and Sedna Planitia O. Bretschger, M. Lisi, C. F. McGinley, B. V. Tucker, J. F. Lockwood		1086

Ambient Effects on Basalts and Rhyolites on Venus and Earth N. T. Bridges		1087

Grain Charging in a Dusty Plasma L. A. Bringol, T. W. Hyde		1088

The Density/Porosity of Asteroids D. T. Britt, D. A. Kring, J. F. Bell		1089

Impact Crater Rebound and Lithospheric Structure on Venus C. D. Brown, R. E. Grimm		1090

Parent Body Alteration Features in CM Rims L. B. Browning, H. Y. McSween Jr., M. E. Zolensky		1091

Identification of Individual Cometary IDP's by Thermally Stepped He Release D. E. Brownlee, D. J. Joswiak, D. J. Schlutter, R. O. Pepin, J. P. Bradley, S. G. Love		1092

Morphologic Identification of Venusian Lavas: Implications for Emplacement of Long Lava Flows B. C. Bruno, G. J. Taylor		1093

Phenomenology of Calderas on Venus M. H. Bulmer, E. R. Stofan, J. E. Guest		1094

Okmyakon Ring Structure in the North-Eastern Siberia: One More Terrestrial Counterpart of Coronae on Venus G. A. Burba		1095

Analysis of Weathering in Antarctic H5 and CR Chondrites Using Mossbauer Spectroscopy T. H. Burbine, R. G. Burns, D. S. Fisher, R. P. Binzel		1096

Hypervelocity Particle Fluxes in Low-Earth Orbit Derived from Craters and Penetration Holes in LDEF Thermal Blankets K. M. Burgess, F. Hoerz, M. E. Zolensky, T. H. See		1097

The Role of Crustal Instability in Crustal Recycling on Venus J. D. Burt, J. W. Head, E. M. Parmentier		1098

A SPOT of Hydrated Silicates on the M Asteroid 201 Penelope? V. V. Busarev, Yu. N. Krugly		1099

Martian "Stealth(s)" B. J. Butler		1100

Episodic OASIS for Water-dependent Life on Mars N. A. Cabrol, A. Brack		1101

Shalbatana Vallis (Mars): Headwater Migrations as an Alternative to Recharge Process N. A. Cabrol, E. A. Grin, G. Dawidowicz		1102

Was Life Discontinuous on Mars? Geology and Exobiology Arguments N. A. Cabrol, C. P. McKay, E. A. Grin		1103

Spectral Characteristics of Fe-Phyllosilicates: Comparison to Murchison and Murray W. M. Calvin, T. V. V. King		1104

Lunar Silicate Absorptions Mapped by Galileo NIMS W. M. Calvin, H. H. Kieffer, L. A. Soderblom, J. M. Sunshine		1105

Time Scales in the Early Solar Nebula A. G. W. Cameron		1106

Radar Studies of the Lunar Regolith B. A. Campbell, B. R. Hawke, T. W. Thompson		1107

Metal-Silicate Partitioning of Sn: an Unusual Case C. J. Capobianco, J. A. Dearo, M. J. Drake, V. J. Hillgren		1108

Igneous Activity and the Origin of the Fretted Channels, Southern Ismenius Lacus, Mars M. W. Carruthers		1109

On the Abundances of Moderately Volatile Elements in Meteorites P. Cassen		1110

Possible Source Compositions for Lunar Picritic Glasses: Ilmenite vs. Karooite A. M. Cazzaniga, P. C. Hess		1111

Dynamical Stability of Systems of Planetary Embryos J. E. Chambers, G. W. Wetherill, A. P. Boss		1112

Enigmatic Major-and Trace-Element Chemistry of Some KREEPy to Super-KREEPy Mg-rich Highland Rocks J. G. Chambers, G. A. Snyder, L. A. Taylor, C. R. Neal		1113

True Modal Analyses of Lunar Mare Soils: X-Ray Digital-Imaging J. G. Chambers, L. A. Taylor, A. D. Patchen, D. S. McKay		1114

Near Earth Asteroid Rendezvous: Eros as the Key to the S-type Conundrum C. R. Chapman		1115

Implications of the Jupiter Comet Crash for the Earth Impact Hazard C. R. Chapman, D. Morrison		1116

Relations Between Plate Movement and Phoebe Regio Tessera? M. G. Chapman		1117

A Comparison Between 107Pd and 53Mn Chronometers in Some Meteorites J. H. Chen, G. J. Wasserburg		1118

A New High-Pressure Polymorph of Chlorapatite in the Shocked Sixiangkou (L6) Chondrite M. Chen, B. Wopenka, X. Xie, A. El Goresy		1119

Near Earth Asteroid Rendezvous: First Launch of the Discovery Program A. F. Cheng		1120

UV-VIS-NIR Spectral Classification in the Gruithuisen Domes Region S. D. Chevrel, P. C. Pinet, J. W. Head, F. Bellagh		1121

INTERMARSNET: an International Network Mission to Mars A. F. Hicarro		1122

Computer Simulation of Ion Radiation Damage in Silicates: Applications to Particle Rims and Formation of "GEMS" in IDPs R. Christoffersen, D. S. McKay		1123

The Response of Chondritic Targets to Impact M. J. Cintala, F. Hoerz, R. V. Morris, T. H. See, F. Vilas		1124

Compositional Spectral Mixing Models of S-type Asteroids: 243 Ida and 951 Gaspra B. E. Clark		1125

Potassium and Sodium Abundances on the Lunar Surface: Implications for Atmospheric Composition P. E. Clark, W. Smyth		1126

Solar Monitor Design for the NEAR X-Ray Spectrometer P. E. Clark, J. Trombka, S. Floyd		1127

Automated Spectral Analysis: Mapping Minerals, Amorphous Materials, Environmental Materials, Vegetation, Water, Ice and Snow, and Other Materials: The USGS Tricorder Algorithm R. N. Clark, G. A. Swayze		1128

Cosmic-Ray Extinct Radioactivity in Molecular Clouds D. D. Clayton, L. Jin		1129

Organic Molecules in Interstellar Graphite Grains. II S. J. Clemett, C. R. Maechling, Y.-H. Chen, R. N. Zare, S. Messenger, S. Amari, X. Gao, R. M. Walker, R. Lewis		1130

Mars: The Response of an Ice-rich Crust to Burial by a Volatile-poor Mantle S. M. Clifford		1131

Coal Reflectance Spectra: Particle Size Effects and Implications for Asteroid Spectroscopy E. A. Cloutis		1132

Spectral Reflectance Properties of Lichens: Implications for Biological Spectroscopic Exploration of Mars E. A. Cloutis		1133

A Search for Metalloporphyrin Absorption Features in the Reflectance Spectra of Oil Sands: Implications for Asteroid Spectroscopy E. A. Cloutis, M. J. Gaffey, T. F. Moslow		1134

Chromium, A Dimer in Silicate Melts?: Implications for Redox Equilibria and Partitioning R. O. Colson, M. C. Colson		1135

Mars Geologic Landform Atlas and Reference Source (MGLARS): A Stand-alone Hypermedia Program Designed for Geologic Research, Education and Map/Image/Data Dissemination C. D. Condit, K. L. Tanaka		1136

Possible Light Echoes During the SL/9 A, H, and Q Impacts G. J. Consolmagno, G. Menard, C. P. Stoll		1137

Doublet Craters on Venus C. M. Cook, H. J. Melosh, W. F. Bottke Jr.		1138

Lunar Pyroclastics: Hide 'n Seek C. R. Coombs, B. R. Hawke		1139

The Formation and Evolution of Lava Tubes C. R. Coombs, G. J. Taylor, S. K. Rowland		1140

Isotopic Measurements of Organic Sulfonates from the Murchison Meteorite G. W. Cooper, S. Chang		1141

Geology of the V31 SIF and Gula Quadrangle of Venus D. L. Copp, J. E. Guest		1142

Thermokarst Landforms and Processes in Ares Vallis, Mars F. M. Costard, V. Baker		1143

Estimates of the Amount and Timing of Gases Released into the Martian Atmosphere from Volcanic Eruptions R. A. Craddock, R. Greeley		1144

Morphometric Analyses of Martian Highland Impact Craters R. A. Craddock, T. A. Maxwell, A. D. Howard		1145

Dependence of Shoemaker-Levy 9 Impact Fireball Evolution on Fragment Size and Mass D. A. Crawford, M. B. Boslough, A. C. Robinson, T. G. Trucano		1146

Venus Lander Power Generation by Infrared Photovoltaic Conversion D. G. Crowe, D. T. Britt		1147

Calibration of the Imager for Mars Pathfinder (IMP) D. G. Crowe, P. H. Smith, N. Chabot, R. Reynolds, R. Tanner, L. Doose, D. T. Britt, R. Singer, J. Palmer, C. Shinohara, K. Devries, T. Friedman		1148

Characteristics of Pahoehoe Flows and Implications for the Emplacement of Compound Lava Flow Fields D. A. Crown, S. M. Baloga		1149

Downflow Morphologic Variations in Hawaiian and Martian Lava Flows D. A. Crown, M. N. Peitersen		1150

Debris Aprons in the Eastern Hellas Region of Mars D. A. Crown, K. H. Stewart		1151

Geologic Mapping Traverse of Xanthe Terra to Chryse Planitia: Viking Lander 1 and Mars Pathfinder Region L. S. Crumpler		1152

Magma Chambers Associated with Calderas on Mars: Significance of Long-term Magma Replenishment Rates L. S. Crumpler, J. W. Head, J. C. Aubele		1153

Porosity Determinations in Interplanetary Dust Particles and Primitive Meteorites J. M. Dahl, M. E. Zolensky, C. A. Sapp, P. J. Burkett		1154

Experimental Reduction of Olivine: Constraints on Formation of Dusty RELICT Olivine in Chondrules L. R. Danielson, R. H. Jones		1155

The NASA Space Grant Program: an Aid in Proposal Planning E. J. Dasch, L. Keffer, K. Pruzan		1156

Radiation-Induced Nano-Diamond Formation and Its Implications for Interstellar Diamonds T. L. Daulton, M. Ozima, Y. Shukolyukov		1157

Silicate Lava Models and the Io Thermal Outburst of 9 January, 1990 A. G. Davies		1158

Isotopic and Chemical Fractionation During Evaporation of CaTiO3 A. M. Davis, A. Hashimoto, R. N. Clayton, T. K. Mayeda		1159

On How to Scale Disruptive Collisions D. R. Davis, E. V. Ryan, P. Farinella		1160

Curvilinear Ridges in Isidis Planitia, Mars--The Result of Mud Volcanism P. A. Davis, K. L. Tanaka		1161

'Melt' Breccias from the Roter Kamm Impact Crater, Namibia J. J. Degenhardt Jr., A. M. Reid, P. C. Buchanan, R. Mcg. Miller		1162

Formation and Metamorphism in Enstatite Chondrites J. M. Dehart, G. E. Lofgren		1163

Hydrogeologic Provinces of Mars R. A. de Hon		1164

4 Vesta: A Thick-Skinned Parent for Basaltic Achondrites J. S. Delaney		1165

Regional Variation of Onset Diameter in the North of Elysium, Mars H. Demura, K. Kurita		1166

Mars Exobiology: The Principles Behind the Plan for Exploration D. J. Desmarais, M. H. Carr, B. C. Clark, D. L. Devincenzi, J. D. Farmer, J. M. Hayes, H. Holland, J. F. Kerridge, H. P. Klein, G. D. McDonald, C. P. McKay, M. A. Meyer, K. H. Nealson, E. L. Shock, D. M. Ward		1167

Streams of H4-6 Chondrite Falls: A Progress Report R. T. Dodd, S. F. Wolf, M. S. Wang, M. E. Lipschutz		1168

Geologic Summary of the Thaumasia Region of Mars Based on Detailed Stratigraphy and Crater Statistics J. M. Dohm, K. L. Tanaka		1169

Low Temperature Thermal History of Non-Chondritic Meteorites as Deduced from Fe2+_Mg Ordering in Orthopyroxene M. C. Domeneghetti, G. M. Molin, H. Palme, M. Stimpfl, J. Zipfel		1170

Mechanical Properties of Dust Aggregates C. Dominik, A. G. G. M. Tielens		1171

Space Science Education Program for K-5 Students D. Douglas		1172

Core Formation in Mars Revisited M. J. Drake, K. Righter, V. J. Hillgren, J. H. Jones, A. H. Treiman		1173

The Plausibility of Boiling Geysers on Triton N. S. Duxbury, R. H. Brown		1174

Melt Segregation in Planetary Interiors: Evidence from the Brenham Pallasite M. M. Eckhardt		1175

K-12 Teacher Workshops in Planetary Science: Some Lessons Learned K. S. Edgett		1176

Physical Properties of the Ares Valles (Primary) and Trouvelot Crater (Back-up) Landing Sites for Mars Pathfinder: Thermal Inertia and Rock Abundance from Viking IRTM Observations K. S. Edgett		1177

Multispectral Thermal Infrared Observations of Sediments in Volcaniclastic Aeolian Dune Fields: Implications for the Mars Global Surveyor Thermal Emission Spectrometer K. S. Edgett, P. R. Christensen		1178

Very Young Volcanic, Lacustrine, and Fluvial Features of the Cerberus and Elysium Basin Region, Mars: Where to Send the 1999 Mars Surveyor Lander K. S. Edgett, J. W. Rice		1179

The Arizona Mars K-12 Education Program: Outreach for Mars Global Surveyor, Mars Pathfinder, and Other Missions K. S. Edgett, P. R. Christensen, D. A. Wakefield, B. M. Rigberg		1180

A Geologic Analysis of Sekmet Mons, Venus, Using Magellan Radar Data M. S. Edmunds		1181

TekLab: Excitement in the Elementary School M. Edwards		1182

Radiative Heating and the Size Distribution of Pre-Chondrule Aggregates of Dust D. D. Eisenhour, P. R. Buseck		1183

Acapulco's Graphite Menagerie: Diverse Carbon and Nitrogen Isotopic Signatures A. El Goresy, E. Zinner, P. Pellas, C. Caillet		1184

Clementine Mission: The Archive of Image Data Products and Data Processing Capabilities E. M. Eliason, E. R. Malaret, G. Woodward		1185

The Compositional Variability of Dolomites in CI Chondrites: Implications for Physico-Chemical Conditions of Circulating Fluids on the CI Parent Body M. Endress, A. Bischoff		1186

Antarctic Micrometeorites (AMMs): Search for Correlation Between C/O Ratios and Elemental Abundances on a Scale of 100 Nanometers C. Engrand, M. Maurette		1187

Electron Microprobe Analyses of Antarctic Micrometeorites and Interplanetary Dust Particles Collected in the Stratosphere C. Engrand, M. Maurette, M. E. Zolensky, G. Kurat, J. Walter		1188

ISM at Mars and Phobos: The Imaging Spectroscopy Data Base S. Erard		1189

Variability of Surface Materials in the Equatorial Regions of Mars S. Erard		1190

On the Origin of the Apollo-16 Dimict Breccias O. Eugster, O. B. James, Ch. Thalmann		1191

Basaltic Volcanic Activity on Mars: Numerical Modelling of Lava Fountain Eruptions S. A. Fagents, L. Wilson		1192

REE Abundances and CR Isotopic Composition of Oldhamite and Associate Minerals from the Pena Blanca Spring Aubrite A. Fahey, G. R. Huss, G. J. Wasserburg, K. Lodders		1193

REE Abundances in Allende 5241 and EGG-6: Correlations with Wide Area Elemental Mapping A. Fahey, G. R. Huss, G. J. Wasserburg, G. P. Meeker		1194

The "Ordinary Chondrite--S Asteroid Controversy"; Still Going, Still Going F. P. Fanale, J. C. Granahan		1195

Mass Loading and the Early Mars Greenhouse: When a Pollutant Becomes the Environment F. P. Fanale, S. E. Postawko		1196

Exopaleontology at the Pathfinder Landing Site J. D. Farmer, D. J. Des Marais, R. Greeley		1197

A Model for Lunar Soil Optical Alteration Due to Space Weathering E. M. Fischer, C. M. Pieters		1198

Experimental Studies of Oxidation Kinetics of the Meteoritic Diamonds by Air Oxygen A. V. Fisenko, V. F. Tatsy, L. F. Semjonova, L. N. Bol'Sheva		1199

Large-Scale Hypervelocity Impact Experiments Using the SHARP Gas Gun at Lawrence Livermore National Laboratory P. S. Fiske, N. Hinsey, L. Brookshaw		1200

Trace Element Fractionations in Hibonite-bearing Evaporation Residues: Comparison with HAL-type Hibonite Inclusions C. Floss, G. Kransel, E. Zinner, H. Palme, W. Rammensee, A. El Goresy		1201

On the Stoichiometry of Metal Abundances in the Lunar Atmosphere B. C. Flynn, S. A. Stern		1202

Thermal Gradients in Interplanetary Dust Particles: The Effect of an Endothermic Phase Transition G. J. Flynn		1203

Chemical Composition of Large Stratospheric Dust Particles: Comparison with Stratospheric IDPs, Cluster Fragments, and Polar Micrometeorites G. J. Flynn, S. Bajt, S. R. Sutton, W. Kloeck		1204

The Chemical Composition of Semarkona Matrix: Implications for Formation and Aqueous Alteration and a Comparison to Hydrated IDPs G. J. Flynn, K. L. Thomas, S. Bajt, S. R. Sutton, W. Kloeck, L. Clark		1205

Diopside in Equilibrated Enstatite Chondrites: EET90102--The First Diopside-bearing EL6 Chondrite R. A. Fogel		1206

Chemical Evolution of Interstellar Dust into Planetary Materials M. N. Fomenkova, S. Chang		1207

Analysis of Fault Lengths Across West Candor Plateau, Valles Marineris, Mars A. N. Fori, R. A. Schultz		1208

Triggering Collapse of the Presolar Cloud with Shock Waves P. N. Foster, A. P. Boss		1209

SIMS Studies of Planetary Cumulates: Modeling Diogenite Petrogenesis G. W. Fowler, C. K. Shearer, J. J. Papike		1210

Long Term Survival of the Topography of Ishtar Terra, Venus A. M. Freed, H. J. Melosh		1211

Petrology and Geochemistry of Target Rocks and Breccias from the Gardnos Impact Structure, Norway B. M. French, C. Koeberl, I. Gilmour, S. B. Shirey, J. A. Dons, J. Naterstad		1212

A Multi-ring Impact Basin in Thaumasia H. Frey, J. H. Roark		1213

The Isostatic State of Martian Topography--Revisited H. Frey, B. G. Bills, R. S. Nerem, J. H. Roark		1214

Processes in Thick Lava Flows: Nakhlites (Mars) and Theo's Flow (Ontario, Earth) R. C. Friedman, G. J. Taylor, A. Treiman		1215

Layering in the Upper Walls of Valles Marineris, Mars: A Diagenetic Origin K. H. Fuks, A. H. Treiman, S. Murchie		1216

The Distribution of Localized Lunar Pyroclastic Deposits as Related to Crustal Thickness L. Gaddis, A. McEwen, M. Robinson		1217

Recalibration of Galileo SSI Lunar Data from EM1: The Effects of Scattered Light Removal L. Gaddis, A. McEwen, T. Becker		1218

Partitioning of V, Cr, Mn, Co, Ni, and CU Among Olivine, Silicate Melt and Sulfide Melt: Implications for Core Formation in the Terrestrial Planets G. A. Gaetani, T. L. Grove		1219

Meteoritic Aspects of the S-Asteroid Issue: A Perspective for the NEAR-Mission M. J. Gaffey		1220

Kinetics of Formation of Hydrous Phyllosilicates in the Solar Nebula J. Ganguly, K. Bose		1221

39Ar-40Ar Age of Ibitira: Dating the Time of Chemical Equilibration of Eucritic Pyroxenes? D. H. Garrison, D. D. Bogard		1222

Mathematical Modelling of Solar System Volcanoes J. B. Garvin, J. J. Frawley		1223

Formation Conditions of Oxidized Ni-rich Spinel J. Gayraud, E. Robin, R. Rocchia, L. Froget		1224

Ejecta Reaccretion on Rapidly Rotating Asteroids: Implications for 433 Eros and 243 Ida P. E. Geissler, J.-M. Petit, R. Greenberg		1225

High Temperature Vaporization of Quartz-Calcite-Anhydrite/Gypsum Targets in Relation to Chicxulub Impact M. V. Gerasimov, Yu. P. Dikov, O. I. Yakovlev, F. Wlotzka		1226

Hyper-Velocity Impact (7.4 km/s) into Basalt Target: Chemical Composition of Vapor M. V. Gerasimov, O. I. Yakovlev, Yu. P. Dikov, G. V. Belov, V. M. Gerasimov, G. S. Smirnov		1227

Correlations of Small Volcanic Edifices in Association with Geologic Features by Class, Density, Elevation, and Geologic Feature Diameter on the Surface of Venus K. A. Gerlach, A. A. Fosse, M. Ellison, J. Johnson, G. Komatsu		1228

Dali Vinculum: Rifting, Coronae and Subduction R. C. Ghail		1229

Clementine Color Mosaics of Procellarum Volcanic Complexes: Evidence for Dome Morphology Linked to Volatile Content and Eruption Rate J. J. Gillis, P. D. Spudis		1230

Formation of Tessera Terrain on Venus: A Structural Analysis of Tellus Regio M. S. Gilmore, J. W. Head III		1231

A Carbon Isotopic Study of Refractory Carbon Phases in Impact Melt Rocks from the Nordlinger Ries Crater I. Gilmour, R. M. Hough, I. P. Wright, C. T. Pillinger		1232

Delivery of Lunar Meteorites to Earth B. Gladman, J. A. Burns, P. Lee		1233

Ablated Tektite from the Central Indian Ocean B. P. Glass, D. R. Chapman		1234

Plume Tectonics of Venus and the Early Earth M. Z. Glukhovsky, V. M. Moralev		1235

Investigation of Callisto's Unusual Photometric Properties Using a "Phase Cube" of Voyager Images J. D. Goguen		1236

The Transition from Dislocation to Diffusion Creep in Ice D. L. Goldsby, D. L. Kohlstedt		1237

Mars Pathfinder Mission and Science Investigation M. P. Golombek		1238

Extension Across Tension Cracks and Tensile Strength of Shallow Crustal Materials on Mars M. P. Golombek, P. A. Davis, W. B. Branerdt, B. J. Franklin		1239

Extension Across Thaumasia and Around Tharsis on Mars M. P. Golombek, B. J. Franklin, K. L. Tanaka, J. M. Dohm, W. B. Banerdt		1240

Mars Pathfinder Landing Site Characteristics M. P. Golombek, T. J. Parker, H. J. Moore		1241

Numerical Study of Formation of Satellite Systems: Prograde and Retrograde Satellites of Jupiter, Saturn and Neptune N. Gor'kavyi		1242

Morphology and Chemical Analyses of Residues from Impacts into MLI-Blankets on EURECA M. M. Grady, A. Sexton, I. P. Wright, G. Drolshagen		1243

H-Chondrite Parent Break-up Seven Million Years Ago: One or More Events? T. Graf, M. W. Caffee, R. C. Finkel, K. Marti, K. Nishiizumi, K. V. Ponganis		1244

Galileo Multi-Instrument Spectral Observations of 243 Ida and Dactyl J. C. Granahan, F. P. Fanale, R. Carlson, L. W. Kamp, K. P. Klaasen, P. Helfenstein, P. Thomas, A. S. McEwen, C. Chapman, J. Sunshine, M. J. S. Belton, Galileo NIMS Team		1245

Planetary Science Education for Pre- and In-Service Teachers in RI: Defining Little Rhody's Place in the Solar System J. A. Grant		1246

Further Constraints on the Erosional Evolution of the Ejecta at Meteor Crater, Arizona, as Revealed by Ground Penetrating Radar J. A. Grant, P. H. Schultz		1247

Definition of Shallow Subsurface Structure Around the Chicxulub Impact Crater Using Ground Penetrating Radar J. A. Grant, P. H. Schultz, J. O. Campos-Enriquez		1248

Effectiveness of Ground Penetrating Radar in Argentine Loess: Implications for Future Mars Surface Radar Sounders J. A. Grant, P. H. Schultz, W. K. Collins		1249

Solar Photon Interaction with the Surface of the Planet Mercury R. Grard		1250

Mercury Orbiter - an Interdisciplinary Mission R. Grard, G. Scoon, M. Coradini		1251

Collisional History of Ida R. Greenberg, P. Geissler, W. Bottke, M. Nolan, J.-M. Petit, D. Durda		1252

Dissolution and Melting Kinetics: Applications to Chondrules J. P. Greenwood, P. C. Hess		1253

Quantification of Extraterrestrial Lava Flow Through Analog Experiments T. K. P. Gregg, J. H. Fink		1254

Volatile Element Abundances in Micrometeorites: Evidence for the Loss of Copper, Germanium, and Zinc During Atmospheric Entry Heating A. Greshake, W. Kloeck, P. Arndt, M. Maetz, A. Bischoff		1255

Flash-Heating of Pyrrhotite from Orgueil (CI): Evidence for the Loss of Sulphur and Selenium during Atmospheric Entry Heating of Polar Micrometeorites A. Greshake, W. Kloeck, G. J. Flynn, S. Bajt, A. Bischoff		1256

Impact Melts and Anorthositic Clasts in Lunar Meteorites QUE93069 and MAC88105 J. A. Grier, D. A. Kring, T. D. Swindle		1257

Planar Deformation Features in Quartz: Target Effects R. A. F. Grieve, A. M. Therriault		1258

Calculating the Effects of Hydrothermal Alteration on Mars L. L. Griffith, E. L. Shock, R. E. Arvidson		1259

Photometric Analysis of Lunar Surfaces with Complex Topography C. Grobner, F. Oschiitz, J. Oberst, H. Hiesinger, R. Jaumann, G. Neukum		1260

Giant Radiating Dike Swarms: Evidence for the Nature of a Global Resurfacing Event on Venus E. B. Grosfils, J. W. Head III		1261

Giant Radiating Dike Swarms on Venus: Stratigraphic Constraints upon Their Time of Emplacement E. B. Grosfils, J. W. Head III		1262

Compositional Variability in Diogenite Pyroxene: Constraints from Experiments on Magnesian Eucrite Parent Magmas T. L. Grove		1263

The Quest for the Elusive LREE Carrier in Ureilities: an Ion Microprobe Study Y. Guan, G. Crozaz		1264

Speculations on Lava Flow Textures on Venus J. E. Guest, M. G. Lancaster, D. L. Copp		1265

Effects and Lifetime of Ocean Induced CO2 Pulses on Mars: Implications for Fluvial Valley Formation V. C. Gulick, D. Tyler, R. M. Haberle, C. P. McKay		1266

Morphology of Rim of Complex Terrestrial Craters E. P. Gurov, A. Yu. Yamnichenko		1267

The Structure of Complex Impact Craters and Estimation of Their Preservation Stage E. P. Gurov, H. P. Gurova, A. Yu. Yamnichenko		1268

The Thermal Evolution of IVA Iron Meteorites: Evidence from Metallographic Cooling Rates H. Haack, F. Ulff-Moller, K. L. Rasmussen		1269

Infrared and Electron Spin Resonance Spectroscopic Studies on Experimentally Shocked Calcite K. Hackbarth, D. Stoeffler		1270

Resonance Passage Via Collisions J. M. Hahn, W. R. Ward		1271

Interpreting the Origins and Evolutions of Martian Basalts from Pyroxene Composition: I. Orthopyroxenes V. E. Hamilton, P. R. Christensen		1272

Topographic Control of Lava Flow Emplacement: Earth, Mars, and Venus D. Hanley, J. R. Zimbelman		1273

Pyroxene Microstructures in the Equilibrated Eucrite Juvinas N. Hanowski, A. J. Brearley		1274

Studies of the Opposition Effect and Negative Polarization with the JPL Photopolarimeters B. Hapke, R. Nelson, W. Smythe, L. Horn, V. Gharakanian, P. Herrera		1275

Evaluation of CCD Systems for NEO Surveys A. W. Harris, E. L. G. Bowell, K. Muinonen		1276

Photoelectric Lightcurves of 433 Eros A. W. Harris, J. W. Young, M. Poutanen, E. Bowell, D. J. Tholen, P. D. Nicholson		1277

Carbonates in the Martian Orthopyroxenite ALH 84001: Evidence of Formation During Impact-driven Metasomatism R. P. Harvey, H. Y. McSween Jr.		1278

How Much Imbrium Material Should be Present at the Apollo 17 Site? L. A. Haskin, B. Moss, W. B. McKinnon		1279

Remote Sensing Studies of the Aristarchus Region of the Moon B. R. Hawke, C. A. Peterson, C. R. Coombs, P. G. Lucey, G. A. Smith, G. J. Taylor, A. S. McEwen, M. S. Robinson, P. D. Spudis		1280

Remote Sensing Studies of the Grimaldi Region of the Moon B. R. Hawke, C. A. Peterson, P. G. Lucey, C. R. Coombs, P. D. Spudis		1281

Remote Sensing Studies of Lunar Anorthosite Deposits B. R. Hawke, C. A. Peterson, P. G. Lucey, G. J. Taylor, D. T. Blewett, P. D. Spudis		1282

Reduction of Iron Oxides in Simulated Lunar Soil Using Carbon as the Reducing Agent S. A. Hayes, R. Bustin, C. C. Allen		1283

Effects of Particles of Light on Reflectance Spectra J. E. Hays, J. F. Mustard		1284

A Pre-Galileo Review of Major Geologic Questions About Ganymede J. W. Head, S. Murchie, G. Collins		1285

Argon Diffusion: Implications for Meteorites from Venus and Mercury and for Venus Outgassing History J. N. Head, T. D. Swindle		1286

Formation and Evolution of Tessera Terrain on Venus: Outstanding Problems J. W. Head III		1287

Geologic Evidence for Onset, Distribution, Diversity and Duration of Lunar Mare Basalt Volcanism: Implications for Petrogenetic Models and Thermal Evolution J. W. Head III		1288

Processes of Crustal and Depleted Mantle Layer Loss on Venus: Evidence from Basins in Tesserae, Uplands, and Plains J. W. Head III		1289

Tectonic Facies in Venus Tessera Terrain: Classification and Interpretation of Sequence of Deformation J. W. Head III		1290

Venus: Synthesis of Observations, Outstanding Questions, and Implications for Future Exploration J. W. Head III		1291

Callisto's Regolith: A Better Estimate of the Ice/Silicate Ratio P. Helfenstein, J. Veverka, J. Hillier		1292

Geologic Map of the MTM-85000 Quadrangle, Mars K. E. Herkenhoff		1293

Inversion of Impact Crater Morphometric Data R. R. Herrick, S. N. Lyons		1294

Oxygen Isotopic Microanalysis of Isolated Forsterites from Ornans (C30) and Murchison (C2) R. L. Hervig, I. M. Steele		1295

Constraints on the Basalt to Eclogite Transition and Crustal Recycling on Venus S. G. Herzog, P. C. Hess, E. M. Parmentier		1296

Search for Extractable Fullerenes in Lunar Samples D. Heymann		1297

Search for Extractable Fullerenes in the Allende Meteorite D. Heymann		1298

The Chicxulub Event: Did it Produce a Global Layer of Fullerene-bearing Sediments? D. Heymann, M. A. Nazarov, A. Korochantsev, J. Smit		1299

Comparison of Unsampled Lunar Basalts H. Hiesinger, R. Jaumann, G. Neukum		1300

X-Ray Digital-Imaging Analysis: Requisite Data for Spectral Reflectance Studies S. J. Higgins, L. A. Taylor, A. D. Patchen, J. G. Chambers, D. S. McKay		1301

Chicxulub Crater Size and Structure as Revealed by Horizontal Bouguer Gravity Gradients and Cenote Distribution A. R. Hildebrand, M. Pilkington, M. Connors, C. Ortiz-Aleman, R. E. Chavez		1302

Clasts from the Calcalong Creek Lunar Meteorite D. H. Hill, U. B. Marvin, W. V. Boynton		1303

Determining the Oxygen Fugacity of Experimental Charges: Don't Believe Everything You Calculate V. J. Hillgren		1304

Shock Deformation and Melting in the Silicate-Metal Powder Mixture N. Hirata, K. Kurita, T. Sekine		1305

Characterization of Absorption Bands (0.6-0.9 microns) in Reflectance Spectra of Primitive Asteroids T. Hiroi, F. Vilas		1306

The Phase Diagram of Ammonia Monohydrate: A New High-Pressure Polymorph D. L. Hogenboom, J. S. Kargel, T. C. Holden, M. Buyyounouski		1307

Satellite Observations and Measurements of the 1991 Mount Pinatubo Eruption R. Holasek, S. Self		1308

The Partitioning of NI and CO Between Metal and FeO-containing Silicate Melts A. Holzheid, H. Palme		1309

Formation of Nebular Shock Waves and Resulting Thermal Histories of Chondrule Precursor Grains L. L. Hood		1310

Interstellar SiC of Type X: How Many Distinct Stellar Sources? P. Hoppe, R. Strebel, B. Pungitore, P. Eberhardt, S. Amari, R. S. Lewis		1311

Trace Elements and Oxygen Isotopes in a CAI-bearing Micrometeorite from Antarctica P. Hoppe, G. Kurat, J. Walter, M. Maurette		1312

Thermal Conductivity of Powdered Silicates Under Simulated Martian Surface Conditions K. Horai, C. Fujii, H. Nakagawa, T. Matsui		1313

Cratering and Penetration Experiments in Aluminium 1100 Targets Using Soda-Lime Glass Projectiles from 1-7 km/s F. Hoerz, M. J. Cintala, R. P. Bernhard, T. H. See		1314

Microdiamonds from the Iridium-rich Layer of the Arroyo EL Mimbral K-T Boundary Outcrop, N. E. Mexico R. M. Hough, I. P. Wright, C. T. Pillinger, I. Gilmour		1315

Fragment Velocities from Collisional Breakup Events K. R. Housen		1316

Spectral Observations of the Mars Trojan 5261 Eureka E. S. Howell, A. S. Rivkin, R. P. Binzel, S. J. Bus		1317

Negative Sm, Eu, and Yb Anomalies in Enstatite from UECs: The Results of Evaporation or Igneous Fractionation? W. Hsu, G. Crozaz		1318

Fine-Grained Dark Rims and Matrix in the Mokoia CV3 Chondrite X. Hua, E. Zinner, P. R. Buseck		1319

Gas Flow and Fluidization in a Thick Dynamic Regolith: A New Mechanism for the Formation of Chondritic Meteorites S. Huang, D. W. G. Sears		1320

Oxygen Isotopes in Refractory Oxide Minerals from Primitive Chondrites G. R. Huss, A. J. Fahey, S. S. Russell, G. J. Wasserburg		1321

Problems in the Nucleosynthesis of O, Mg, and TI in an Al2O3 Grain from an AGB Star G. R. Huss, A. J. Fahey, G. J. Wasserburg		1322

Silicon and Carbon Isotopes in SiC from the Qingzhen (EH3) Chondrite G. R. Huss, A. J. Fahey, G. J. Wasserburg		1323

The Al26 Mg26 Record of Chondrules: Clues to Nebular Chronology I. D. Hutcheon, R. H. Jones		1324

Dust Grain Resonances in Protoplanetary Systems T. W. Hyde, R. Nazzario		1325

Ejecta Deposits on the Icy Satellites: Deeper Insights into the Cratering Process F. Iaquinta-Ridolfi, P. Schenk		1326

REE Abundances in Chondrules from Murchison and Yamato-793321 (CM) Meteorites: Constraints on the Formation of CM Chondrules M. Inoue, N. Nakamura		1327

Migration of Small Bodies to the Earth S. I. Ipatov		1328

Rb/Cs Archean Komatiite Glass Inclusions: A Common Rb/Cs in Earth and Moon, and Implications for Crustal Growth T. R. Ireland, W. F. McDonough		1329

Unusual Inclusions in Metal of the Enstatite Chondrite Clast in Kaidun: Composition and Origin A. V. Ivanov, G. J. MacPherson, N. N. Kononkova, M. E. Zolensky, L. F. Migdisova		1330

Sequence of Events in Tessera Formation, Northern Ovda Regio, Venus M. A. Ivanov, J. W. Head		1331

Thermoluminescence Measurements in Shocked Oligoclase A. I. Ivliev, D. D. Badjukov, L. L. Kashkarov		1332

Rifting and Corona Formation in Eastern Aphrodite Terra, Venus E. Jackson, C. D. Brown, R. E. Grimm		1333

Mars Volatile Evolution from SNC and Planetary Data Analysis B. M. Jakosky, J. H. Jones		1334

C14 Measurements of the Martian Atmosphere: an Indication of Surface-Atmosphere Exchange of CO2 B. M. Jakosky, R. C. Reedy, J. Masarik		1335

Siderophile Elements in Lunar Impact Melts: Nature of the Impactors O. B. James		1336

Lithospheric Control of Plateaus Above Venusian Diapirs D. M. Janes, S. W. Squyres		1337

Reliability of Magellan Altimetry: Evidence from a Stereo Digital Elevation Model D. G. Jankowski, S. W. Squyres		1338

Anomalous-Cosmic Ray Origin of Al26 in Molecular Clouds L. Jin, D. D. Clayton		1339

The Sudbury Igneous Complex--An Impact Melt Sheet? G. W. Johns, B. O. Dressler		1340

Regional Resolution Analyses of Magellan Gravity Data C. L. Johnson, D. T. Sandwell		1341

VFLOW: A Computer Model for the Movement of Gravity Flows Over Venus Topography J. R. Johnson, L. Gaddis		1342

Multispectral Mixture Modeling of the Apollo 15 Landing Site P. E. Johnson, P. C. Pinet, S. D. Chevrel, D. Sabol, J. B. Adams		1343

Stealth Plumes on Io T. V. Johnson, D. L. Matson, D. L. Blaney, G. J. Veeder, A. G. Davies		1344

Relative Abundances of Chondrule Textural Types in E3 Chondrites T. Johnson, G. E. Lofgren		1345

Apollo 17 Impact-Melt Breccias: In Search of Imbrium Components B. L. Jolliff, R. L. Korotev, K. M. Rockow, L. A. Haskin		1346

Manson Impact Structure: The Impact-Melt Component B. L. Jolliff, R. L. Korotev, K. M. Rockow, L. A. Haskin		1347

A Zoned Lunar Zircon in a Quartz-Monzodiorite Breccia from Apollo 14: U, Th, Other Trace Elements, and Raman Spectral Parameters B. L. Jolliff, B. Wopenka, E. Zinner, D. T. Kremser		1348

A Petrogenetic Classification for the Eucrite Clan--Partial Melts, Fractionated Liquids, Cumulates, and Oddities J. H. Jones, D. W. Mittlefehldt		1349

A Chondrule Origin for Dusty, RELICT Olivine Grains R. H. Jones, L. R. Danielson		1350

A Fossil Linear Zone of Weakness Beneath the Kasei Valles, Mars? H.-P. Jons		1351

Large-scale Emplacement of Young Lavas in the Area of the TaNo Va-Updoming, Mars H.-P. Jons		1352

C14 Terrestrial Ages and Weathering of Meteorites from the Allan Hills Region and Meteorite Hills, Antarctica A. J. T. Jull, S. Cloudt, E. Cielaszyk, D. J. Donahue		1353

Making Melts Having 40%, 50%, or 60% SiO2 from Chondritic Materials: A Synopsis of Low-Pressure, Low-Volatile, Equilibrium Melting Relations A. J. G. Jurewicz, J. H. Jones, D. W. Mittlefehldt, J. Longhi		1354

Preliminary Results of Olivine/Metal Wetting Experiments and the Direct Measurement of Metal Phase Interconnectivity S. R. Jurewicz, J. H. Jones		1355

Goldstone 3.5-cm Radar Observations of the 1995 Mars Opposition R. F. Jurgens, M. A. Slade, C. R. Franck, S. D. Howard, E. M. Standish, R. Winkler, D. Choate, R. Cormier, P. Dendrenos, R. Rose		1356

Upper Mantle Oxidation and Evolution of Primary Metallic Phases A. A. Kadik		1357

Separating the Melt from the Crystalline Matrix: Simulation in a Centrifuge A. A. Kadik, Ye. B. Lebedev		1358

Development and Use of Multimedia Material in Planetary Science A. Kanaya		1359

World-Wide-Web Tools for Locating Planetary Images B. Kanefsky		1360

Lunar Orbiting Observatory Mission Y. Kaneko, Y. Takizawa, T. Kawazoe		1361

Mars ISRU Sample Return (MISR)--A Mission Overview D. I. Kaplan		1362

The Ammonia-Water System: an Attempt to Reconcile the LaFayette and UCLA Investigations J. S. Kargel, D. L. Hogenboom		1363

The Early Radiation-Thermal History Model for the Ordinary Chondrite Formation by Track Data L. L. Kashkarov		1364

The Oxidation State of Altered Rims on Ilmenite from Lunar Soils L. P. Keller, R. Christoffersen, D. S. McKay		1365

A Compositional and Morphological Study of Apollo Asteroid 4953 (1990MU) M. S. Kelley, M. J. Gaffey		1366

Realism in Nebular Simulations C. E. Kenknight		1367

Trace Element Constraints on the Formation of the Rim on a Compact Type A Inclusion A. K. Kennedy, A. W. Bevan		1368

The Exobiological Exploration of Mars J. F. Kerridge, M. H. Carr, B. C. Clark, D. J. Desmarais, D. L. Devincenzi, J. D. Farmer, J. M. Hayes, H. Holland, B. M. Jakosky, G. F. Joyce, A.H. Knoll, G.D. McDonald, C.P. McKay, M.A. Meyer, K.H. Nealson, E.L. Shock, D.M. Ward		1369

Thermal Constraints on the Lengths of Tube-Fed Lava Flows on the Earth, Moon, Mars, and Venus L. P. Keszthelyi		1370

Physical Properties Controlling the Style of Extensional Deformation in the Tharsis Region of Mars W. S. Kiefer, M. S. Johnson		1371

Modelling Gravity Anomalies at Martian Shield Volcanos: A Reduced Estimate of Elastic Lithosphere Thickness at Olympus Mons W. S. Kiefer, M. T. Zuber, K. K. Williams		1372

Numerical Models of Caldera-Scale Volcanic Eruptions on the Earth, Venus, Mars, Triton and Io S. W. Kieffer, G. A. Valentine		1373

OH in the Mercurian Exosphere as a Function of Polar Ice CAP R. M. Killen, T. H. Morgan, J. Benkhoff		1374

The Isotopic Signature of Recently Implanted Solar Nitrogen in 68815 J. S. Kim, Y. Kim, K. Marti, J. F. Kerridge		1375

Evolutionary Trends in Acapulcoites and Lodranites: Evidence from N and Xe Signatures Y. Kim, J. Zipfel, K. Marti		1376

Petrology, Chemistry and Chronology of an Impact-Melt Clast in the Hvittis EL6 Chondrite L. K. Kinsey, T. J. McCoy, K. Keil, D. D. Bogard, D. H. Garrison, K. Kehm, R. H. Brazzle, C. M. Hohenberg, D. W. Mittlefehldt, I. Casanova		1377

New Gravity Data Over the Southwestern Portion of the Chicxulub Impact Feture, Yucatan Peninsula, Mexico G. Kinsland, M. Hurtado, A. Ceron, W. Smythe, A. Ocampo, K. Pope		1378

New Statistical Results on the Spatial Distribution and Physical Properties of Impact Craters on Venus R. L. Kirk, G. G. Schaber, R. G. Strom		1379

Spectroscopic Evidence for Widespread Low-Albedo Ferric Minerals on the Tharsis Plateau L. Kirkland, S. Murchie		1380

On the Polarization Opposition Effect of E-type Asteroid 64 Angelina N. N. Kiselev, N. M. Shakhovskoy, Yu. S. Efimov		1381

Ni59 in Canyon Diablo Spheroids J. Klein, R. Middleton, S. Xue, G. F. Herzog, J. Masarik, R. C. Reedy		1382

40Ar-39Ar Dating of ALH 84001: Evidence for the Early Bombardment of Mars S. F. Knott, R. D. Ash, G. Turner		1383

Ring Structures and Degassing Features on Asteroid Ida G. G. Kochemasov		1384

Shock Metamorphism at the Red Wing Creek Structure, North Dakota: Confirmation of Impact Origin C. Koeberl, W. U. Reimold		1385

Origin of Impact Melt Breccias and Suevites in Drill Cores from the Manson Impact Structure Determined from Mixing Calculations C. Koeberl, W. U. Reimold, R. R. Anderson, A. Kracher		1386

The Newporte Impact Structure, North Dakota: Shock Metamorphism in Breccias C. Koeberl, W. U. Reimold, D. Brandt		1387

Petrology, Mineralogy, Geochemistry, and Age of Impact Melt Rocks from the AMES Structure, Oklahoma C. Koeberl, W. U. Reimold, R. D. Dallmeyer, R. A. Powell		1388

Diamonds from the Popigai Impact Structure, Russia C. Koeberl, V. L. Masaitis, F. Langenhorst, D. Stoeffler, M. Schrauder, C. Lengauer, I. Gilmour, R. M. Hough		1389

Ares Vallis: Flood Geomorphology of Mars Pathfinder Landing Site G. Komatsu, V. R. Baker, J. R. Johnson		1390

Flow Reconstruction for Ares Vallis, Mars G. Komatsu, G. G. Ori, P. K. House, V. R. Baker		1391

Geochemical Stratigraphy of the Apollo 15, Apennine Front Core (15007/8) R. L. Korotev		1392

Geochemistry and Maturity of Soil from Apollo 16 Double Drive Tube 68001/2 R. L. Korotev, R. V. Morris		1393

Compositional Trends in Apollo 12 Soils R. L. Korotev, K. M. Rockow		1394

A Simulated Geochemical Rover Mission to the Taurus Littrow Valley of the Moon R. L. Korotev, L. A. Haskin, B. L. Jolliff		1395

Preliminary Compositional and Petrographic Examination of Lunar Meteorite QUE 93069 R. L. Korotev, B. L. Jolliff, K. M. Rockow, L. A. Haskin		1396

Relation of 2-4 MM Regolith Breccias to the Local Soil at Apollo 17 R. L. Korotev, K. M. Rockow, B. L. Jolliff		1397

VH-Nuclei Cosmic-Ray Track Study in Plagioclase Crystals from Erevan Howardite Individual Clasts and Inclusions N. N. Korotkova, L. L. Kashkarov		1398

Size Distribution of Young and Old Coronae on Venus M. A. Kreslavsky		1399

Venera-15,-16 Radar Brightness of Venus Surface: Comparison with Magellan Data M. A. Kreslavsky		1400

The Geochemistry of a New Lunar Meteorite, QUE93069, a Breccia with Highland Affinities D. A. Kring, D. H. Hill, W. V. Boynton		1401

Alteration of CV3 Carbonaceous Chondrites: Parent Body vs. Nebular Processes A. N. Krot, E. R. D. Scott		1402

Parent-Body Alteration of Type 3 Ordinary Chondrites A. N. Krot, M. E. Zolensky, J. T. Wasson, E. R. D. Scott, R. A. Mendybaev, K. Ohsumi		1403

Lunar Visibilities and Lighting Conditions M. Kruiff, W. J. Ockels		1404

Ages of Australasian Tektites J. Kunz, K. Bollinger, E. K. Jessberger, D. Storzer		1405

On the Terrestrial Dust Component in the Ice at CAP Prudhomme, Antarctica G. Kurat, C. Koeberl, F. Brandstaetter, J. Walter, M. Maurette		1406

Composition of the Lower Mantle and Origin of the Moon from Interstellar Dust O. L. Kuskov, Yu. I. Sidorov, A. I. Shapkin		1407

Mars: Comparative Analysis of Termoscan and Viking-IRTM Data R. O. Kuzmin, Y. M. Gektin, A. S. Selivanov, P. R. Christensen, D. Noss		1408

Lunar LIGO and the Study of Astrophysical Phenomena N. L. Lafave, T. L. Wilson		1409

Protype Superconducting Lunar Telescope Mount M. Lamb, K. B. Ma, R. Cooley, D. Mackey, R. Meng, C. W. Chu, W.-K. Chu, P. C. Chen, T. L. Wilson		1410

Longitudinal Profiles of Sinuous Rilles on Venus J. C. Langdon, G. Komatsu, V. R. Baker		1411

Moldavites from Lusatia (Germany) III: Sr-Isotope-, Ar40 Ar39, and Fission Track-Studies J.-M. Lange, K. Bollinger, P. Horn, E. K. Jessberger, P. Schaaf, D. Storzer		1412

Moldavites from Lusatia (Germany) II: A Chemical Comparison with Czech Moldavites J.-M. Lange, K. T. Fehr, T. Grund, M. Langenauer, T. Meisel, H. Palme, B. Spettel, D. Stoeffler		1413

Moldavites from Lusatia (Germany) I: Occurrences and Geology of Their Host Sediments J.-M. Lange, G. Knuth, H. Wagner		1414

The Effects of Ionic Radius and Charge on Diffusion of Mg, Ca, Ba, Ti, Zr, Nd, and Yb in Basaltic Melt T. Z. La Tourrette, A. J. Fahey, G. J. Wasserburg		1415

Nickel Fractionation During Troilite Formation in the Solar Nebula D. S. Lauretta, D. T. Kremser, B. Fegley Jr.		1416

On Nature of Chromium Isotope Anomalies in Meteorites A. K. Lavrukhina		1417

Project ARTIST: Integrating Astronomy and Planetary Sciences into the Elementary and Middle School Curriculum L. A. Lebofsky, N. R. Lebofsky		1418

The Gravitational Field of the Moon: Goddard Lunar Gravity Model-1 F. G. Lemoine, D. E. Smith, M. T. Zuber		1419

The Abundance and D/H of Water Dissolved in EETA 79001 Shocked Glass and Crystalline Host L. A. Leshin, S. Epstein, E. M. Stolper		1420

Kuiper Belt Object Encounters with the Pluto-Charon Binary: A Mechanism for Exciting Charon's Eccentricity H. F. Levison, S. A. Stern		1421

A Search for Luna 20 Basalts D. J. Lindstrom, R. R. Martinez		1422

Trace Elements in Small VLT Basalt Clasts from 72235 D. J. Lindstrom, R. R. Martinez		1423

"Exploring the Solar System": A Model for Teacher Workshops and Scientist-Educator Partnerships M. M. Lindstrom, J. Allen, R. Fitzmaurice		1424

QUE93069, A More Mature Regolith Breccia for the Apollo 25th Anniversary M. M. Lindstrom, D. W. Mittlefehldt, R. V. Morris, R. R. Martinez, S. J. Wentworth		1425

Green and Brown Ringwoodite in L-Chondrites of the Sahara C. M. Lingemann, D. Stoeffler		1426

Orbital Evolution of Micron-sized Dust Grains Coming from the Kuiper Belt J. C. Liou, H. A. Zook, S. F. Dermott		1427

Some Observations on the Petrology of Enstatite Chondrites PCA91020 and EET87746 with Implications for Chondrite Forming Processes G. E. Lofgren, J. M. Dehart		1428

A Critical End Point to Pigeonite-Augite Liquidus Equilibria J. Longhi, C. M. Bertka		1429

Plagioclase-Melt Wetting Angles and Textures: Implications for Anorthosites J. Longhi, S. R. Jurewicz		1430

Lava Flows on Alba Patera: Analysis of Flow Properties Using Three Complementary Models R. Lopes-Gautier, B. Bruno, G. J. Taylor, C. Kilburn		1431

Cassini Mission: Radar Sensing of Craters on Titan R. Lorenz		1432

Mercurian Meteorites: Properties and Probabilities S. G. Love, K. Keil		1433

Kasei Valles, Mars (I): The Water Story B. K. Lucchitta		1434

Kasei Valles, Mars (II): The Ice Story B. K. Lucchitta		1435

A Mixing Model Approach to Obtaining Quantitative Mineralogy from Spectra of Lunar Soils P. G. Lucey		1436

Modeling the Spectral Effects of Microscopic Iron Metal on Glass and Minerals P. G. Lucey		1437

Derivation of Fe Abundance with 1-2 wt% Precision from Clementine Multispectral Imaging P. G. Lucey, G. J. Taylor		1438

Global Distribution of Iron on the Moon and Its Implications for the Magma Ocean, Crustal Structure and Lunar Origin P. G. Lucey, G. J. Taylor, E. Malaret		1439

Radial Heterogeneity of 53Mn in the Early Solar System? G. W. Lugmair, C. MacIsaac		1440

Volcano-Tectonic Evolution of Tharsis Tholus, Mars F. Maciejak, J.-F. Lenat, A. Provost		1441

Flash Heating a Type B CAI Composition S. V. Maharaj, R. H. Hewins		1442

Numerical Simulation of Retrograde Gravitational Capture of a Satellite by Venus: Implications for the Thermal History of the Planet R. J. Malcuit, R. R. Winters		1443

The Origin of Pluto's Peculiar Orbit R. Malhotra		1444

Redox Fractionation Among Chondrites: Mossbauer Study T. V. Malysheva		1445

Age Relationship Between Plains South of Lakshmi Planum A. G. Marchenko		1446

Surface Compositional Heterogeneities Related to the Martian Geomorphic Dichotomy P. Martin, P. Pinet, R. Bacon, A. Rousset, F. Bellagh		1447

Disruption and Reaccumulation of Miranda F. Marzari, V. Vanzani, S. Weidenschilling, D. Davis		1448

Terrestrial Analogs of Lunar Granulites V. L. Masaitis, M. S. Mashchak		1449

Low-Energy Neutrons and Reaction Products in the Lunar Surface J. Masarik, R. C. Reedy		1450

Production of Cosmogenic Nuclides in SNC Meteorites in the Martian Surface J. Masarik, R. C. Reedy		1451

New Geological, Geophysical and Remote Sensing Data from the Highbury Impact Structure, Zimbabwe S. Master, R. A. Armstrong, D. Brandt, M. F. F. Ferraz, T. Gumede, C. Koeberl, W. U. Reimold, D. J. Robertson, T. Woldai, P. Zeil		1452

The Sinamwenda Structure--A Small New Meteorite Impact Crater in Triassic (Upper Karoo) Sandstones of Western Zimbabwe S. Master, D. J. Robertson, C. W. Stowe, K. L. Walsh, W. U. Reimold, D. Brandt		1453

Solar NE in the Brenham Pallasite K. J. Mathew, F. Begemann		1454

Comparative Study of Crustal Production Rates of Mars, Venus and the Earth T. Matsui, E. Tajika		1455

Crustal and Lithospheric Structure of Martian Impact Basins L. C. Mauldin, R. E. Grimm		1456

Carbonaceous Phases in Antarctic Micrometeorites and Their Mineralogical Environment. Their Contribution to the Possible Role of Micrometeorites as "Chondritic Chemical Reactors" in Atmospheres, Waters and/or Ices M. Maurette, C. Engrand, A. Brack, G. Kurat, S. Leach, M. Perreau		1457

"Chemical" Search for Cometary Grains in Antarctic Micrometeorites M. Maurette, C. Engrand, G. Kurat		1458

Another Martian Meteorite T. K. Mayeda, K. Yanai, R. N. Clayton		1459

Lunar Crustal Stratigraphy Inferred from Cooling Rate Studies of Exsolved Pyroxenes I. S. McCallum, H. E. O'Brien		1460

Interpretation of Spectral Compositional Units on the Icy Galilean Satellites T. B. McCord, C. R. Coombs, J. Granahan, J. Sunshine		1461

Detection of Meteoroids Entering the Earth's Atmosphere T. B. McCord, J. Morris, D. Persing		1462

Zagami: Another New Lithology and a Complex Near-Surface Magmatic History T. J. McCoy, M. Wadhwa, K. Keil		1463

An Explanation for the Abundance Enigma of the Highly Siderophile Elements in the Earth's Mantle W. F. McDonough		1464

New Digital Images of the Moon A. C. McEwen, T. Becker, A. Bennett, J.-A. Bowell, K. Edwards, E. Eliason, L. Gaddis, C. Isbell, A. Howington-Kraus, R. Kirk, E. Lee, H. Morgan, M. Robinson		1465

Global Albedo Variations on the Moon: Clementine 750-nm Observations A. S. McEwen, M. S. Robinson, T. C. Duxbury, B. J. Buratti		1466

Clementine and Groundbased Observations of the Aristarchus Region of the Moon A. S. McEwen, M. S. Robinson, E. M. Eliason, P. G. Lucey, B. R. Hawke, T. C. Duxbury		1467

Two Classes of Impact Basins on the Moon A. S. McEwen, M. Shoemaker, M. T. Zuber, D. E. Smith		1468

Mineral-Chemical Variations During Basalt Crystallization J. J. McGee, O. B. James		1469

Factors Affecting the Growth, Development, and Structure of Large Volcanoes on Venus P. J. McGovern, S. C. Solomon		1470

Estimates of Elastic Lithosphere Thickness and Heat Flux Beneath Large Volcanoes on Venus P. J. McGovern, M. Simons, S. C. Solomon		1471

Patinas on Lunar Rocks: The Unusual Surface of Apollo 17 Basalt 75075 D. S. McKay, S. J. Wentworth, K. M. McBride		1472

Constraining the Density of Comets from Crater Chains on Callisto and Ganymede W. B. McKinnon, L. A. M. Benner, P. M. Schenk		1473

Formation of CAIs by Partial Melting and Accretion During Heating in a Gas of Solar Composition G. P. Meeker		1474

The Distribution and Behaviour of Martian Ground Ice During Past and Present Epochs M. T. Mellon, B. M. Jakosky		1475

Hypervelocity Particle Capture in Ultra-Pure Aerogel D. J. Mendez, J. T. Ryder, K. Nishioka, G. Carl, T. Bunch		1476

Simulated IDP Track Entrainment of Surface Contaminated Capture Media D. J. Mendez, J. T. Ryder, K. Nishioka, G. Carl, T. Bunch		1477

Evaporation Rate of Silicon Carbide in Reducing Gases R. A. Mendybaev, J. R. Beckett, L. Grossman, E. Stolper, R. F. Cooper, J. P. Bradley		1478

Organic Molecules in Interstellar Graphite Grains. I. S. Messenger, S. Amari, X. Gao, R. M. Walker, S. J. Clemett, C. R. Maechling, Y. H. Chen, R. N. Zare, R. Lewis		1479

Martian Sinuous Ridges: Exploring Their Paleoclimate Significance S. M. Metzger		1480

Aqueous Alteration of Primary Rock on the CM Parent Body K. Metzler		1481

Parameterized Hydrostatic and Explosive Burning of Hydrogen, Helium, and Carbon B. S. Meyer		1482

An Outline of the Jules Verne Discovery Mission to Explore the Lunar Mantle Via South Pole-Aitken Basin C. Meyer		1483

A Search for Ancient Life on Mars: The Role of Small Missions M. A. Meyer, J. F. Kerridge		1484

Scale-Dependent Characterization of Volcanic Flow Margins G. Michaels, R. Greeley, E. Lo		1485

Mineralogical Study of LEW88774; Not So Unusual Ureilite T. Mikouchi, J. Chikami, H. Takeda, M. Miyamoto		1486

Porphyritic Olivine in Angrite LEW87051: Cooling Rate and Evidence for Complex Crystallization History from RELICT Cores and Zoning Profiles T. Mikouchi, M. Miyamoto, G. A. McKay		1487

Mineralogical Constraints from Asteroid Radar Observations D. L. Mitchell, S. J. Ostro, R. S. Hudson		1488

Petrology of Two New Ferroan Anorthosites and Six Apollo 11 Basaltic Rock Fragments J. N. Mitchell, G. A. Snyder, L. A. Taylor		1489

Petrology and Chemical Composition of a Suite of Apollo 16 Impact-Melt Breccias J. N. Mitchell, G. A. Snyder, L. A. Taylor, B. L. Beard		1490

Hunting the HED Holy Grail: A (Slightly) Magnesian Basalt Clast from EET 92014 Howardite and a Review of Alleged Primary, Magnesian HED Basalts D. W. Mittlefehldt, M. M. Lindstrom		1491

ALH 84001: Trace Element Geochemical Similarites of its Trapped Melt Component to Nakhla, Lafayette and Chassigny D. W. Mittlefehldt, M. M. Lindstrom, E. K. Gibson Jr.		1492

Compositional Changes of Planetary Bodies by Impact Processes Y. Miura, G. O. Iancu, M. Okamoto		1493

Takamatsu Crater Structure: Preliminary Report of Impact Crater in Active Orogenic Region Y. Miura, M. Okamoto, T. Fukuchi, H. Sato, Y. Kono, M. Furumoto		1494

Raman Spectra of Diamonds in the Canyon Diablo Iron Meteorite M. Miyamoto		1495

3D Spherical Convective Models of Venus M. Monnereau, P. Rosenblatt, P. C. Pinet		1496

Geology of the Tempe-Mareotis Region, Mars H. J. Moore		1497

Volcanic Color Units on the Surface of Io R. L. Morris, D. L. Domingue		1498

Why is Martian Soil Magnetic? R. V. Morris		1499

Nitrogen and Oxygen Photochemistry at the Shoemaker-Levy 9 Impact Sites J. I. Moses, M. Allen, G. R. Gladstone		1500

Sulfur Photochemistry at the Shoemaker-Levy 9 Impact Sites J. I. Moses, M. Allen, G. R. Gladstone		1501

The EUNEASO Photometric Follow-up Program S. Mottola, G. de Angelis, M. di Martino, A. Erikson, A. W. Harris, G. Hahn, G. Neukum, P. Pravec, M. Wolf		1502

Space Science Education Using the World Wide Web P. J. Mouginis-Mark		1503

Galileo Observations of Volcanic Hot Spots on Io: Predictions from Thermal Data of Hawaiian Eruptions P. J. Mouginis-Mark, L. P. Flynn		1504

Planetary Rover Unit: A Hands-on Educational Facility to Motivate K-12 Students Towards Excellence in Science and Mathematics A. V. Murali		1505

Space Science and Technology Educational Program (SSTEP) for K-12 Students in Southeast Texas: A Multidisciplinary, Multi-Institutional Consortium Study at LAMAR University-Beaumont A. V. Murali		1506

The Relation of 433 Eros to Other S Asteroids: Evidence from Reflectance Spectroscopy at 0.33-2.5 microns S. L. Murchie, C. M. Pieters		1507

Martian Impacts and the Grooves of Phobos: Implications for the Evolution of Phobos' Rotation Axis J. B. Murray, J. C. Iliffe		1508

Digital Elevation Models of the North Polar Regions of Mars J. B. Murray, D. A. Rothery		1509

Nitrogen and Noble Gas Components in the Martian Orthopyroxenite ALH 84001 S. V. S. Murty, R. K. Mohapatra, C. J. Clement		1510

Are Dark Red Soils and Bright Dust on Mars Related Through Mineralogic Phase Changes? J. F. Mustard		1511

Evidence for Cryptomare in the Northern Light Plains of the Moon J. F. Mustard, J. W. Head		1512

The Role of Hydrogen and Carbon in Evaporation of Forsterite in the Solar Nebula H. Nagahara, K. Ozawa		1513

Primordial Noble Gas-Rich Component in the CM Chondrites: Implications for the Site of Phase Q T. Nakamura, K. Nagao, N. Takaoka		1514

Degassing of Argon, Helium, and Water and the Nature of Crustal Formation on Venus N. Namiki, S. C. Solomon		1515

A New Type of Carbonaceous Chondrite Matter from the Erevan Howardite M. A. Nazarov, F. Brandstaetter, G. Kurat		1516

Angrite-like Clasts from the Erevan Howardite M. A. Nazarov, F. Brandstaetter, G. Kurat		1517

Parnallee (LL 3.6) Heating Experiments: Implications for the Origin of Type 6 and 7 Chondrites C. E. Nehru, M. K. Weisberg, M. Prinz		1518

Crustal Structure of Large Impact Basins on the Moon G. A. Neumann, M. T. Zuber, F. G. Lemoine, K. K. Williams		1519

Water in an Indochinite: Implications for the Thermal History of Tektites S. Newman, J. Beckett, N. Bashir, E. Stolper		1520

Blast Waves and the Blow-off Effect in Terrestrial Atmospheres W. I. Newman, T. J. Ahrens		1521

Metal-Silicate Fractionation in the Solar Nebula H. E. Newman		1522

A New Member of the "CH" Chondrite Group of Meteorites: Nitrogen and Carbon Stable Isotope Geochemistry of RKP 92435 J. Newton, M. M. Grady, C. T. Pillinger		1523

Evaporation of Forsterite: Identification of Gas-phase Species Via Knudsen Cell Mass Spectrometry R. H. Nichols Jr., G. J. Wasserburg, R. T. Grimley		1524

Tholeitic Basalts of Venus as Compared to Normal Mid-Ocean Ridge Basalts of Earth in Terms of K-U-Th Systematics O. V. Nikolaeva		1525

Exposure History of Lunar Meteorite QUE93069 K. Nishiizumi, M. W. Caffee, R. C. Finkel, R. C. Reedy		1526

Solar Cosmic Ray Records in Meteorites K. Nishiizumi, R. C. Finkel, M. W. Caffee, R. C. Reedy		1527

Final Results of Cosmogenic Nuclides in Lunar Rock 64455 K. Nishiizumi, C. P. Kohl, J. R. Arnold, R. C. Finkel, M. W. Caffee, J. Masarik, R. C. Reedy		1528

Continued Studies of Interstellar SiC Grains of Type X L. Nittler, S. Amari, K. Kehm, R. Walker, E. Zinner, R. Lewis		1529

Laser Ablation ICPMS: A Powerful New Tool for Microbeam Trace Element Analysis M. D. Norman		1530

The Clementine Mission S. Nozette		1531

Formation and Impact-Metamorphic Ages of Monomict Type 6 Eucrite Y792510 L. E. Nyquist, H. Takeda, D. D. Bogard, B. M. Bansal, H. Wiesmann, C.-Y. Shih		1532

"Martians" Young and Old:" Zagami and ALH 84001 L. E. Nyquist, B. M. Bansal, H. Wiesmann, C.-Y. Shih		1533

Clementine Stereo Data Analysis: Digital Terrain Models and Rectified Color Images J. Oberst, A. Cook, T. Roatsch, F. Scholten, J. Storl, F. Wewel, J. Albertz, H. Hoffmann, R. Jaumann		1534

Photogrammetric Evaluation of Galileo SSI Ida Images: Preliminary Results J. Oberst, B. Giese, R. Wagner, R. Jaumann, G. Neukum, T. Ohlhof, M. Dorn, W. Zeitler, H. Ebner, E. Gill, O. Montenbruck		1535

Chicxulub Ejecta Blanket Deposits from Belize: Key to Large Impacts into Volatile-Rich Terrain A. C. Ocampo, K. O. Pope, A. G. Fischer		1536

DLR-Goniospectrophotometer Abundance Estimates from Bidirectional Reflectance Measurements in the UV, VIS and NIR A. Oehler, N. Hanowski		1537

Spectral Photometric Parameters (UV, VIS, NIR) for 13 Materials Similar to Lunar and Asteroidal Regoliths A. Oehler, A. Dummel, N. Hanowski, H. Rebhan, G. Neukum		1538

Thermal and Orbital History of a Blocky Enceladus G. W. Ojakangas, R. Malhotra		1539

The Earth as a Ringed Planet J. A. O'Keefe		1540

The Role of Central Peak Oscillation in the Formation of Complex Planetary Craters J. D. O'Keefe, T. J. Ahrens		1541

Mbosi: an Anomalous Iron with Anomalous Silicate Inclusions E. J. Olsen, A. M. Davis, R. N. Clayton, T. K. Mayeda, R. S. Clarke Jr., J. T. Wasson		1542

Geological Mechanisms of Resurfacing on Venus (Atalanta and Niobe Planitae, Atropos Tessera, Vesta and UT Rupes) G. G. Ori, V. R. Baker		1543

Geological History of the Area Surrounding the Mouth of the Ares Vallis (Mars) G. G. Ori, G. Komatsu, V. R. Baker		1544

Nature of the Low Emissivity Highlands on Venus Inferred from the Analysis of Magellan Data: Sapas, Maat and Ozza Montes G. M. Palazzari, R. A. Brackett, R. E. Arvidson		1545

Source Materials for North American Tektites R. L. Palma, M. N. Rao, M. W. Rowe		1546

Trace Element Fractionation in Differentiated Planetesimals by Non-Equilibrium Partial Melting H. Palme, S. Chakraborty		1547

SIMS Studies of Planetary Cumulates: Orthopyroxene from the Stillwater Complex, Montana. The Bronzitite/Norite Transition J. J. Papike, G. W. Fowler, I. S. McCallum, C. K. Shearer		1548

Crustal Separation on Europa: New Evidence and a Volcano-Tectonic Mechanism for Resurfacing R. Pappalardo, R. Sullivan, D. Rood, R. Greeley, M. Coon		1549

Effect of Residence Time at Maximum Temperature on the Texture and Phase Compositions of a Type B Ca-Al-Rich Inclusion Analog J. M. Paque		1550

Modelling the Maximum Lengths of Channel-fed Lava Flow Fields E. A. Parfitt, L. Wilson		1551

Maximum Lengths of Channelised Lava Flows on Earth, Venus and Mars E. A. Parfitt, L. Wilson, J. W. Head		1552

Viking Stereo of the Martian Crustal Dichotomy in Southern Elysium: Evidence for Extensive Fluvial and Coastal Erosion? T. J. Parker, P. M. Schenk		1553

Spatial and Temporal Scales of Lunar Differentiation: Implications for Subsequent Thermal and Chemical Evolution of the Moon E. M. Parmentier, P. C. Hess		1554

Are Isotopically Solar Components Present in Heavy Noble Gases from Terrestrial Mantle Samples? Perhaps... R. O. Pepin		1555

Examination of KR and Xe Isotopes in Pesyanoe by Acid-Etching R. O. Pepin, P. E. Rider		1556

Breakdown of Primary Na,Al-rich Pyroxene in an Al-rich Object from the Gorlovka H3-4 Chondrite: Evidence for Secondary Heating and Partial Melting M. I. Petaev		1557

The Partitioning of Iodine Between Sulfide Liquid and Silicate Liquid: Implications for the Cosmochemistry of Iodine M. T. Peters, M. B. Baker, D. S. Burnett		1558

Impact Cooling of a Magma Ocean C. A. Peterson		1559

A Re-Evaluation of Impact Melt/Vapor Production E. Pierazzo, A. M. Vickery, H. J. Melosh		1560

The Low-Ti Basalts of Tsiolkovsky as Seen by Clementine C. M. Pieters, G. He, S. Tompkins, M. I. Staid, E. M. Fischer		1561

Aristarchus Plateau Spectral Mapping from Clementine and Telescopic High Resolution Spectro-Imaging Data P. C. Pinet, F. M. Costard, S. Chevrel, P. Martin, F. Bellagh		1562

Reiner Gamma Formation: Optical, Spectroscopic and Polarimetric Properties from Clementine and Earthbased Data P. C. Pinet, V. V. Shevchenko, S. Chevrel, F. Bellagh, C. Rosemberg		1563

Field Measurements of the Rheological Properties of Basaltic Lavas H. Pinkerton, R. A. Herd, R. M. Kent, L. Wilson		1564

Origin of Rare Gases in the Terrestrial Atmosphere and Planetary Comparisons D. Porcelli, G. J. Wasserburg		1565

The Georgia Tektite Strewn Field H. Povenmire		1566

The Sylacauga, Alabama Meteorite: The Impact Locations, Atmosphere Trajectory, Strewn Field and Radiant H. Povenmire		1567

Evidence for Metamorphic PB in Ancient Lunar Highland Rocks (>3.9 Ga)?: an Alternative Explanation for "Ugly" U-Pb Systematics W. R. Premo		1568

PB Isotopes of Non-Mare Lunar Rocks (>3.9 Ga): Constraints on Early Lunar Evolution W. R. Premo, M. Tatsumoto		1569

Major-Element and Isotopic Compositions of Relic Tektites and Glass-like Shards from the K-T Boundary Spherule Bed at EL Mimbral, Mexico W. R. Premo, G. A. Izett, G. P. Meeker		1570

Laboratory Measurements of Thermal Conductivity of Particulate Materials Under Martian Atmospheric Pressures M. A. Presley, P. R. Christensen		1571

Resurfacing History of the Venusian Plains Based on Distribution of Impact Craters M. Price		1572

Emplacement of Volcanic Deposits on Mid-Ocean Ridges: Venus Comparisons L. M. Prockter, J. W. Head, L. Wilson, D. K. Smith		1573

The Martian Northern Plains Did Not Result from Plate Tectonics M. J. Pruis, K. L. Tanaka		1574

Yamato Unequilibrated Eucrites Y-74450, Y-793548, Y-82210, Y-74159, and Y-75011: Pyroxene Trace Element Systematics A. Pun, J. J. Papike		1575

Possible Post-Impact Metamorphosis in Impactite Garnet J. Raitala, T. Halkoaho		1576

Cosmogenic-Nuclide Depth Profiles in Lunar Rocks R. C. Reedy, J. Masarik		1577

Mineral Identification from Well-Calibrated Multispectral Imaging on the Surface of Mars R. J. Reid, R. B. Singer		1578

The Vredefort Dome in the Witwatersrand Basin: New Argon Chronological Data and the Geochronological Record of the Central Kaapvaal Craton Between>3 and <1 GA Ago W. U. Reimold, R. L. Gibson, W. P. Colliston, P. W. Layer		1579

No Evidence of Shock Metamorphic Effects in Clasts in Late Paleozoic Dwyka and Late Archean Mozaan Diamictites from Southern Africa W. U. Reimold, V. V. Brunn, C. Koeberl		1580

Nanokhod: A Miniature Instrument Deployment Device with Instrumentation for Chemical, Mineralogical and Geological Analysis of Planetary Surfaces, for Use in Connection with Fixed Planetary Surface Stations R. Rieder, H. Waenke, V. Gromov, A. Kemurdjian, V. Kucherenkov, P. Sologub, B. Andreichikov, A. Kalyushniy, B. Korchuganow, V. Linkin, E. Kankeleit, G. Klinghöfer, J. Foh, P. Held, R. Teucher, O. Prilutzkii, E. Evlanov, V. Khromov, B. Zubkov, T. Economu, G. Neukum, H. Hoffman, H. Michaelis, E. Ress, M. Langfeld, P. Jakes		1581

An Analytical Electron Microscope (AEM) Study of Hydrous Alteration of Amorphous Magnesiosilica Smokes F. J. M. Rietmeijer		1582

Magnesium Loss from Unmelted Stratospheric Interplanetary Dust Particles During Atmospheric Entry F. J. M. Rietmeijer		1583

On the Possibility of Phyllosilicate Alteration in the KOSI-2 Comet Simulation Experiment F. J. M. Rietmeijer, K. Thiel		1584

Metal-Silicate Partition Coefficients for Siderophile Elements (Ni, Co, P, W and Mo) at 8, 15 and 70 kb, 1300-1750 deg C K. Righter, M. J. Drake, G. Yaxley		1585

Lineament Analysis of Fortuna Tessera, Venus: Results from an Ongoing Study K. M. Riley, R. C. Anderson, B. J. Peer		1586

Three-Micron Spectra of Hydrated Asteroids R. S. Rivkin, L. A. Lebofsky		1587

Spinel from the Cretaceous-Tertiary Boundary: Characteristics, Origin and Implications E. Robin, J. Gayraud, L. Froget, R. Rocchia		1588

A New Digital Image Mosaic of Mercury M. S. Robinson, K. Edwards		1589

The Meteoritic Content of Lybian Desert Glasses R. Rocchia, E. Robin, L. Froget, J. Gayraud, H. Meon, E. Diemer		1590

Manson Impact Structure Research Program: Summary Through January 1995 D. J. Roddy, E. M. Shoemaker, R. R. Anderson		1591

Petrogenesis of Carbon and Sulfur-bearing Minerals in the Martian Meteorite ALH 84001 C. S. Romanek, K. L. Thomas, E. K. Gibson, D. S. McKay, R. A. Socki		1592

Areal Geology of the Pandrosos Dorsa Quadrangle (V5), Venus L. Rosenberg		1593

Hypsometry as an Investigative Tool of the Lithospheric Structure and Tectonic Style of Venus P. Rosenblatt, P. C. Pinet		1594

Getting Planetary Science into the Open University Degree D. A. Rothery		1595

Near-Infrared Geometric Albedos of Charon and Pluto: Constraints on Charon's Surface Composition T. L. Roush, D. P. Cruikshank, J. B. Pollack, E. F. Young, M. J. Bartholomew		1596

Deciphering Projectile Compositions of Impact Craters via Shock Recovery Experiments on Simple Metal-Silicate Systems L. R. Rowan, F. Hoerz		1597

Thermal Infrared (7-14 microns) Spectral Imaging of Mars C. M. Rowland, T. L. Roush, G. C. Sloan, J. F. Bell III		1598

Shock Metamorphism of Enstatite Chondrites A. E. Rubin, E. R. D. Scott, K. Keil		1599

New Clues on the Origin of the Martian Sinuous Ridges S. W. Ruff		1600

The Diana Discovery Mission: A Solar Electric Propulsion Mission to the Moon and a Comet C. T. Russell, J. Abshire, M. F. A'Hearn, C. Alexander, A. Konopliv, A. Metzger, J. Arnold, J. Berthelier, R. Elphic, M. Hickman, D. Palac, R. Jaumann, G. Neukum, T. McCord, R. Phillips, C. Pieters, W. Purdy, R. Rosenthal		1601

Isotopically Unusual Inclusions from CO3 Meteorites: Links to CAIs from Other Meteorite Classes S. S. Russell, A. J. Fahey, G. R. Huss, G. J. Wasserburg		1602

A15 Green Glass Volatiles and Oxidation State M. J. Rutherford, R. A. Fogel		1603

Fine-grained CAIs in Efremovka and Leoville: In-Situ Layer Growth and Confirmation of a Link to Rims on Coarse-grained CAIs A. Ruzicka, W. V. Boynton		1604

Chemical Variation Among Serenitatis Impact Melt Breccia Samples in the Taurus-Littrow Valley, Apollo 17 Landing Site G. Ryder, K. Stockstill		1605

Tephra Deposits at the Apollo 17 Landing Site Using Telescopic CCD Images D. E. Sabol Jr., M. O. Smith, J. B. Adams, P. C. Pinet		1606

Sulfur Isotopic Studies of a P-rich Sulfide in a Carbonaceous Xenolith from the Erevan Howardite S. Sahijpal, M. A. Nazarov, J. N. Goswami		1607

Morphology, Diameter, and Elevation Distribution of Small Volcanic Edifices on Venus Between Phoebe and Ulfrun Regio J. F. Lockwood, J. Johnson, G. Komatsu		1608

Thermal Controls on Tube-fed Planetary Lava Flow Lengths S. E. H. Sakimoto, S. M. Baloga		1609

Surface Properties of Phobos/Deimos and Formation of Self-Sustained Martian Dust Torus S. Sasaki		1610

Infrared Diffuse Reflectance Spectra of Binary Mixtures of Olivine, Enstatite and Plagioclase K. Sato, M. Miyamoto		1611

Scientific Analysis and Display of Planetary Data with McIDAS-eXplorer R. S. Saunders, S. S. Limaye, R. Krauss		1612

Transformation Conditions of Plagioclase and Dark-Colour Minerals from Puchezh-Katunki Astrobleme Rocks L. V. Sazonova, V. Feldman, N. Korotaeva		1613

Update on the USGS Impact Crater Database for Venus G. G. Schaber, R. L. Kirk, R. G. Strom		1614

Paleosols on Mars: Another Look at the Viking Lander Measurements M. W. Schaefer		1615

Geology of Large Impact Basins on Ganymede and Callisto P. Schenk, F. Iaquinta-Ridolfi		1616

Historical Examples of Tidally Split Comets: Crater Chains on Callisto and Ganymede P. Schenk, E. Asphaug, W. B. McKinnon, L. A. M. Benner, H. J. Melosh		1617

An Improved Method for Determining the HF Isotopic Composition of Lunar Basalts E. E. Scherer, B. L. Beard, K. M. Barovich, C. M. Johnson, L. A. Taylor		1618

The Fractionation of Os, Re, Ir, Ru, Rh, Pd and AU in Impact Melts from European Impact Craters (Saaksjarvi, Mien and Dellen) and the Determination of the Meteoritic Components G. Schmidt, H. Palme, K. L. Kratz		1619

Asteroid Entry into Venusian Atmosphere: Pressure and Density Fields R. M. Schmidt, P. J. Hassig		1620

Interlune-One: A Scientific Mission Across the Surface of the Moon H. H. Schmitt, M. D. Griffin, G. L. Kulcinski, E. M. Shoemaker		1621

X-Ray Investigation of Olivine and Orthopyroxene in Experimentally Shocked Samples of the H6-Chondrite Kermouve R. T. Schmitt, A. Deutsch		1622

Differences in the Metamorphic History of High Petrologic Type EH and EL Chondrites and the Luminescence Properties of Enstatite D. M. Schneider, Y. Zhang, D. W. G. Sears, P. H. Benoit		1623

Noble Gases in Chondrites from a Proposed Meteoroid Stream L. Schultz, H. W. Weber		1624

Effect of Impact-induced Shear Heating on Vaporization and Melting P. H. Schultz		1625

Making the Man in the Moon: Origin of the Imbrium Basin P. H. Schultz		1626

Relationship Between Uplift, Faulting, and Strain Across Valles Marineris, Mars R. A. Schultz, D. A. Senske		1627

Elastic Buckling of Fractured Basalt: Case Study of the Columbia Plateau, Earth, Using an Improved Strength Criterion R. A. Schultz, T. R. Watters		1628

Experimental Self-Diffusion Data for Orthopyroxene and Its Significance for Meteorite Cooling Rates C. S. Schwandt		1629

Fragmentation and Reaccretion of Differentiated Asteroids: Evidence from Thermal Histories of Meteorites and Theoretical Constraints E. R. D. Scott, S. G. Love, H. Haack		1630

Magnetic Studies of the Clearwater Lake Impact Structures R. G. Scott, M. Pilkington, E. I. Tanczyk		1631

The Formation of Chondrules D. W. G. Sears, S. Huang, P. H. Benoit		1632

Johnson Space Center Meteoroid and Debris Data, Database and Access over the Internet T. H. See, H. D. Patrick, J. L. Warren, M. E. Zolensky		1633

Rifting on Venus, Characteristics and Geologic Associations D. A. Senske		1634

Carbon Isotopic Measurements of Fragments of Meteoritic Macromolecule Produced by Hydrous Pyrolysis M. A. Sephton, C. T. Pillinger, I. Gilmour		1635

Sm-Nd Systematics of a Large Eucrite Clast in the Vaca Muerta Mesosiderite and Initial Solar System Sm146 Abundances M. Sharma, D. A. Papanastassiou, G. J. Wasserburg		1636

Extreme Sm-Nd Fractionation Due to Melting in the Oceanic Upper Mantle: Evidence from Polar Urals Ophiolites M. Sharma, G. J. Wasserburg, D. A. Papanastassiou, J. E. Quick, E. V. Sharkov, E. E. Laz'ko		1637

Origin of the Appollo 15 Green Glass. Evidence From Ni, Co, Mn, V, and CR C. K. Shearer, G. D. Layne, J. J. Papike		1638

The Role of Ilmenite in the Source Region for Mare Basalts: Evidence from Nb and Zr in Picritic Glasses C. K. Shearer, J. J. Papike, G. D. Layne		1639

Backscatter Mossbauer Spectrometer (BaMS) for Solid-Surface Extraterrestrial Mineralogical Analysis T. D. Shelfer, R. V. Morris, T. Q. Nguyen, D. G. Agresti, E. L. Wills		1640

Carbonado: More Clues to a Common Impact Origin for Samples from Brazil and the Central African Republic D. Shelkov, A. B. Verchovsky, C. T. Pillinger, R. Hutchison, H. J. Milledge		1641

Precise Re-Os Determinations on IIA and IVA Iron Meteorites J. J. Shen, D. A. Papanastassiou, G. J. Wasserburg		1642

Ion Microprobe Study of Lunar Highland Cumulate Rocks: New Results J. W. Shervais, J. B. Stuart		1643

Lunar Record of a Cometary Shower V. V. Shevchenko		1644

Iron Isotopes in Chainpur Chondrules C.-Y. Shih, L. E. Nyquist, H. Wiesmann		1645

Whole Rock Compositions of Aubritic Meteorites: Implications for Their Origin T. K. Shimaoka, K. Shinotsuka, M. Ebihara, M. Prinz		1646

A Metamorphic Sequence of Ordinary Chondrites Based on the Distribution of REE, Th and U K. Shinotsuka, M. Ebihara		1647

Can Lunar Opposition Spike Measured by Clementine Exist? Yu. G. Shkuratov, D. G. Stankevich		1648

Clementine Observations of Melt Rocks and Volcanic Materials in the Schrodinger Basin E. M. Shoemaker, M. S. Robinson		1649

Pu-Xe Dating of Eucrites A. Shukolyukov, F. Begemann		1650

Geochemistry of the Cretaceous/Tertiary Impact Ejecta Deposit in Mexico and Belize H. Sigurdsson, S. D. Hondt, S. Carey, J. M. Espindola, J. L. Macias		1651

Crystallization of Compact Type A Refractory Inclusions: Implications from Crystal Zoning and Trace Element Distribution S. B. Simon, A. M. Davis, L. Grossman		1652

Admittance Constraints on the Thickness of the Venusian Lithosphere? M. Simons, S. C. Solomon, B. H. Hager		1653

Application of the Magellan GVDR to Venus Surface Studies R. A. Simpson, M. J. Maurer, G. L. Tyler		1654

Production Cross Sections for C14 from Elements Found in Lunar Rocks: Implications for Cosmic Ray studies J. M. Sisterson, R. J. Schneider, A. J. T. Jull, D. J. Donahue, S. Cloudt, A. Beverding, P. A. J. Englert, C. Castaneda, J. Vincent, R. C. Reedy		1655

Could CAIs Have Survived as Small Objects in the Solar Nebula for a Million Years or More? W. R. Skinner		1656

Mars Pathfinder Landing Site: Implications of Goldstone Radar CW and Ranging Observations M. A. Slade, R. F. Jurgens		1657

Progress in Improving Our Knowledge of the Shape of Mars from Occultations D. E. Smith, M. T. Zuber		1658

Deriving the Dynamics of Eros from Gravity Variations D. E. Smith, M. T. Zuber, D. D. Rowlands		1659

Comparison of Sizes, Shapes, and Morphologies of Submarine Volcanoes and Volcanoes on Venus D. K. Smith, J. R. Cann		1660

Update on the Imager for Mars Pathfinder (IMP) P. H. Smith, D. T. Britt, L. R. Doose, R. B. Singer, M. G. Tomasko, F. Gliem, R. Greeley, R. Sullivan, H. U. Keller, J. M. Knudsen, L. A. Soderblom		1661

Comparative Re-Os Isotope Systematics in IIA and IIIA Iron Meteorites M. I. Smoliar, R. J. Walker, J. W. Morgan, S. B. Shirey		1662

The Growth and Modification of Lunar Crust: KREEP Basalt Crystallization and Precipitation of Mg-and Alkali Suite Cumulates G. A. Snyder, L. A. Taylor		1663

Another Sortie for Pristine Rocks at Mare Tranquillitatis: Chemistry of 1--4 MM Basaltic Fragments in Soil 10085, 1161 G. A. Snyder, J. D. Chambers, L. A. Taylor		1664

40Ar/39Ar Ages of Apollo 11 Group D Basalts: Evidence of High-Ti Volcanism in the Nectaris Basin and a Probable 2.0 GA Age for Crater Theophilus? G. A. Snyder, C. M. Hall, L. A. Taylor, A. N. Halliday		1665

Mantle Sources of Lunar Volcanism in the Ocean of Storms: Evidence from Trace-Element and Nd Isotopic Chemistry of Fine-Grained Basalts at Apollo 12 G. A. Snyder, C. R. Neal, L. A. Taylor, A. N. Halliday		1666

Cryogenic Weathering as a Mechanism for Extreme 13C Enrichment in Martian Carbonate: Soil from Wright Valley, Antarctic as a Terrestrial Analog R. A. Socki, C. S. Romanek, E. K. Gibson Jr.		1667

Source of Nuclei Production in the Protosolar Nebula M. S. Spergel		1668

Clementine Laser Altimetry and Multi-Ring Basins on the Moon P. D. Spudis		1669

Physical Environment of the Lunar South Pole from Clementine Data: Implications for Future Exploration of the Moon P. D. Spudis, K. R. Stockstill, W. J. Ockels, M. Kruijff		1670

Scientific Objectives for the Exploration of Mars S. W. Squyres, M. H. Carr		1671

A Search for Ice at the Lunar Poles N. J. S. Stacy, D. B. Campbell		1672

A Multispectral View of Stratigraphy in Mare Tranquillitatis M. I. Staid, C. M. Pieters, J. W. Head		1673

Simulation of the Albedo-Color Diagrams for the Moon and Asteroids L. V. Starukhina, Yu. G. Shkuratov		1674

Cathodoluminescence and Minor Elements in Murchison SiC Grains I. M. Steele, R. S. Lewis, S. Amari		1675

Minor Element Zoning Revealed by Cathodoluminescence and Substitution of MG and NA into Synthetic and Natural Anorthite I. M. Steele, M. T. Peters, E. E. Shaffer, D. S. Burnett		1676

Multielement Analysis of Antarctic Micrometeorites Using SEM, EDXA, EMPA, TOF-SIMS, and PIXE T. Stephan, P. Arndt, E. K. Jessberger, M. Maetz, D. Reimold, J. Walter		1677

Carbonates on Mars: Experimental Results S. K. Stephens, D. J. Stevenson, G. R. Rossman		1678

Global Evolution of Solids in Viscous Protoplanetary Disks T. F. Stepinski, P. Valageas		1679

High-resolution HST Images of the Pluto-Charon System S. A. Stern, M. W. Buie, L. M. Trafton, B. C. Flynn		1680

Coronae on Venus: Topographic Variations and Correlations Between Morphology and Regional Setting E. R. Stofan		1681

Surface Morphology of Steep-Sided Domes on Venus: Implications for Emplacement History E. R. Stofan, D. A. Crown, S. W. Anderson, J. J. Plaut		1682

Small Body Mapping Results--1994 P. J. Stooke		1683

The Use of Image processing in the Classroom M. M. Strait		1684

Dynamical Evolution of Vapor Clouds by Oblique Impacts on Venus S. Sugita, P. H. Schultz		1685

Nitrogen, Neon and Argon in the PCA91467, an ALH85085-like Chondrite N. Sugiura, S. Zashu		1686

Cosmogenic Nitrogen in Stony Meteorites N. Sugiura, Y. Miura, K. Kiyota, S. Zashu, K. Hashizume		1687

Geology of 243 Ida R. Sullivan, R. Greeley, R. Pappalardo, M. Belton, M. Carr, C. Chapman, R. Greenberg, P. Geissler, J. Granahan, J. Head, R. Kirk, A. McEwen, P. Lee, P. Thomas, J. Veverka, D. Morrison, J. Moore		1688

Towards a More Sophisticated Approach to Compositional Interpretation of Silicate Absorptions in Asteroid Spectra J. M. Sunshine		1689

Cosmogenic Effects in Mbale Chondrite K. M. Suthar, C. J. Clement, S. V. S. Murty, N. Bhandari		1690

Phosphorus Adsorption and Desorption Properties of Minnesota Basalt Lunar Simulant B. Sutter, L. R. Hossner, D. W. Ming, D. L. Henninger		1691

GSECARS: A National Resource for Earth and Planetary Science Research at the Advanced Photon Source, Argonne National Laboratory S. R. Sutton, M. L. Rivers		1692

Noble Gas Analysis and INAA of Aqueous Alteration Products from the Lafayette Meteorite: Liquid Water on Mars <350 MA Ago T. D. Swindle, M. K. Burkland, J. A. Grier, D. L. Lindstrom, A. H. Treiman		1693

The Luminescing Lunar Regolith S. J. K. Symes, P. H. Benoit, D. W. G. Sears, D. S. McKay		1694

CU Silicates: Synthesis, Crystal Structure Determination and an Implication to the Partitioning Behavior of Transition Metal Ions in the Igneous Processes T. Tachi, H. Horiuchi, H. Nagasawa		1695

Physical Properties of Comet Shoemaker-Levy 9: Origin and Progenitor Size T. Takata, T. J. Ahrens		1696

Fragment and Progenitor Energy of Comet Shoemaker-Levy 9 and Frequency of Such Impact Events T. Takata, T. J. Ahrens, A. W. Harris		1697

Eruption Characteristics of Long Lava Flows on the Northern Flank of Elysium Mons, Mars M. J. Tatsumura, P. J. Mouginis-Mark		1698

The Moon: Unsolved Problems and How to Solve Them G. J. Taylor		1699

Where Has All the Lunar Water Gone? L. A. Taylor, G. R. Rossman, Q. Qi		1700

A Micrometeorite Collector for the South Pole Water Well S. Taylor, J. Lever, R. Harvey		1701

Planar Deformation Features in Quartz Grains from Mixed Breccia of the Avak Structure, Alaska A. M. Therriault, A. Grantz		1702

Further Measurements of Sulfur Isotopes in Ureilites: Evidence for a 33S Isotopic Anomaly M. H. Thiemens, T. Jackson		1703

Hydrated Cluster Particles: Chemical and Mineralogical Analyses of Fragments from Two Interplanetary Dust Particles K. L. Thomas, L. P. Keller, S. J. Clemett, D. S. McKay, S. Messenger, R. N. Zare		1704

Preliminary Analysis of Polycyclic Aromatic Hydrocarbons in the Martian (SNC) Meteorite ALH 84001 K. L. Thomas, C. S. Romanek, S. J. Clemett, E. K. Gibson Jr., D. S. McKay, C. R. Maechling, R. N. Zare		1705

Resonance Ionization: Potential Application of Few-Atom Detection Techniques to Inter-Planetary Dust Particle and 'Stardust' Studies N. Thonnard		1706

Central Peaks of Lunar Impact Craters: New Views from Clementine S. Tompkins, C. M. Pieters		1707

Topographic and Stratigraphic Characteristics of Ridge Belts Associated with Tessera Boundaries on Venus: Examples from Northern Ovda Regio Margin and Kutue Tessera T. Tormaenen		1708

Topography and Morphology of Double-type Coronae on Venus from Magellan Data T. Tormaenen, K. Kauhanen		1709

Nakhla and Its Look-Alikes: Al-Depleted Magmas and Mantle Differentiation on Mars and the Earth A. H. Treiman, G. J. Taylor, R. Friedman		1710

The X-Ray/Gamma-Ray Spectrometer for the NEAR Mission J. I. Trombka, W. V. Boynton, J. Bruckner, S. W. Squyres, S. H. Bailey, P. E. Clark, L. G. Evans, S. R. Floyd, R. Starr, R. Gold, J. Goldsten, R. McNutt		1711

Formulation of Isotopic Mass Fractionation by Evaporation of Solids and Its Application to Chondritic Materials A. Tsuchiyama, T. Takahashi, C. Uyeda		1712

Magellan, Venus, and the Earth D. L. Turcotte		1713

Martian Elastic Lithospheric Thickness from Flexural and Gravitational Modeling E. P. Turtle, H. J. Melosh		1714

Shock-induced Devolatilization and Isotopic Fractionation of H from Murchison Meteorite, Possible Implication for Atmospheric Accretion J. A. Tyburczy, T. J. Ahrens, X. Xu, S. Epstein		1715

Technical Challenge, Scientific Thrill: A Long Term Lander on an Active Comet S. Ulamec, B. Feuerbacher, K. Wittmann, H. Rosenbauer, G. Haerendel, F. Lura		1716

Can We Use Remote Thermal Emission Observations to Derive Lunar Surface Properties? M. L. Urquhart, B. M. Jakosky		1717

53Mn Evidence on a Scenario of Forming the Solar System G. K. Ustinova		1718

On the Problem of Be and B Generation in the Solar System G. K. Ustinova		1719

Pre-Atmospheric Sizes and Orbits of Some Recently Fallen Chondrites G. K. Ustinova, V. A. Alexeev		1720

Numerical Simulation of Some Consequences Induced by the Comet SL-9 in the Jovian Atmosphere S. V. Utyuzhnikov, A. V. Konyukhov		1721

Automated SEM-Search for Micrometer-Sized Antarctica Micrometeorites from East Antarctica (Dome B) Ice Core Samples T. B. Vanderwood, J. P. Bradley, M. Maurette, J. R. Petit, N. I. Barkov, G. Kurat		1722

On the Extraction of Nitrogen and Noble Gases from Presolar Diamonds by Pyrolysis A. B. Verchovsky, C. T. Pillinger		1723

Asteroid 433 Eros: High Resolution Imaging and Spectral Mapping from NEAR J. Veverka, M. Malin, S. Murchie, J. F. Bell III, C. Chapman, L. McFadden, M. Robinson, P. Thomas		1724

Future Exploration of Mercury F. Vilas		1725

Constraints on the Rare Earth Element Characteristics of Metasomatizing Fluids in the Martian Meteorite ALH 84001 M. Wadhwa, G. Crozaz		1726

Sm-Nd Systematics of the Eucrite Chervony Kut M. Wadhwa, G. W. Lugmair		1727

Origin of High-Ti Lunar Magma by Erosion of Ilmenite T. P. Wagner, T. L. Grove		1728

Cosmic Spherules, Micrometeorites, and Chondrules J. Walter, F. Brandstaetter, G. Kurat, C. Koeberl, M. Maurette		1729

Effect of Pressure and Temperature on the Partitioning of Ni, Co, W and MO Between Liquid-Silicate and Liquid-Metal M. J. Walter, Y. Thibault		1730

Raman Spectroscopy as a Method for In-situ Lunar Mineralogical Remote Sensing A. Wang, L. A. Haskin, B. L. Jolliff		1731

SEM Studies on the Chemical and Petrologic Features of Taizhou (L-5) Chondrite in China H. Wang, Y. Li, F. Zhang, C. Lin		1732

QUE93069: A Lunar Meteorite Rich in HASP Glasses P. H. Warren, G. W. Kallemeyn		1733

Magnetic Properties of Bjurbole Chondrules P. J. Wasilewski, T. L. Dickinson, D. F. Nava, M. V. O'Bryan		1734

The Disintegration of Comet Shoemaker-Levy 9 and the Tunguska Object and the Origin of the Australasian Tektites J. T. Wasson		1735

Rock Mass Strength Criterion Applied to Ridged Plains on Mars: Implications for Elastic Buckling T. R. Watters, R. A. Schultz		1736

A Laser Raman Spectrometer System Suitable for Incorporation into Lander Spacecraft T. J. Wdowiak, D. G. Agresti, S. B. Mirov		1737

Refractory Inclusions from the CH-Chondrite PCA 91467: Similarities with and Relationship to Inclusions from ALH 85085 and ACFER 182 D. Weber, S. Schirmeyer, A. Bischoff		1738

Can Gravitational Instability Form Planetesimals? S. J. Weidenschilling		1739

Multi-Zone Modeling of Planetary Accretion: Updated Results S. J. Weidenschilling, D. R. Davis		1740

EH3 and EL3 Chondrites: A Petrologic-Oxygen Isotopic Study M. K. Weisberg, J. S. Boesenberg, G. Kozhushko, M. Prinz, R. N. Clayton, T. K. Mayeda		1741

Galileo NIMS Direct Observation of the Shoemaker-Levy 9 Fireballs and Fall Back P. R. Weissman, R. W. Carlson, J. Hui, M. Segura, W. D. Smythe, K. H. Baines, T. V. Johnson, P. Drossart, T. Encrenaz, F. Leader, R. Mehlman		1742

Lunar Pyroclastic Deposits: Nature and Distribution of Pyroclastic Glasses at Taurus-Littrow C. M. Weitz, J. W. Head III		1743

Deriving the Optical Constants of Quartz Using Thermal Emission Spectroscopy M. L. Wenrich, P. R. Christensen		1744

Carbonates in the Martian Meteorite, ALH 84001: Water-borne But Not Like the SNCs S. J. Wentworth, J. L. Gooding		1745

Sieving the Finest Fractions of Lunar Soils S. J. Wentworth, A. Basu, D. S. McKay		1746

The Formation and Habitability of Extra-Solar Planetary Systems G. W. Wetherill		1747

Crater Morphometry on Venus: Morphometric Trends in the Youngest Bright-Floored Craters R. W. Wichman		1748

Crater Morphometry on Venus: Relative Floor Size and Internal Crater Modification R. W. Wichman		1749

Solar Xe, Kr, and AR in Lunar Samples; Do They Get Fractionated in the Sun or on the Moon? R. Wieler, H. Baur		1750

Extensive Weathering in Type 3 Ordinary Chondrites from Frontier Mountain M. J. Wight, I. P. Wright, C. T. Pillinger		1751

Site Selection for the Interlune-1 Mission D. J. Wilcox, C. J. Merry		1752

Lunar Mascon Basins: Analysis of Effective Elastic Lithosphere Thickness Using Gravity Anomaly Models K. K. Williams, G. A. Neumann, M. T. Zuber		1753

Antimatter on the Moon T. L. Wilson		1754

Monte Carlo Production of Neutrinos on the Moon T. L. Wilson, R. C. Svoboda		1755

Photoelectric Observations of 125 Asteroids W. Z. Wisniewski, T. M. Michalowski, A. W. Harris, R. S. McMillan		1756

Contents of Thermally Labile Trace Elements in and Weathering of Antarctic H4--6 Chondrites S. F. Wolf, M. E. Lipschutz		1757

Are Hermes and 1988 XB Parent Bodies of HED Meteorites? Comparisons of Dates of Meteorite Falls and NEA Orbit Close Approaches C. A. Wood, R. Fevig, A. Willman, W. Wormer		1758

Were Chondrules Formed Early or Late in the Protosolar Nebula? J. A. Wood		1759

CM Rims: In Situ Rare Gas Analysis of Murchison D. S. Woolum, K. Kehm, C. M. Hohenberg, K. Poelstra, E. Guntalilib		1760

Recovering Parental Magma Compositions: A Single-Blind Test of the Method and an Analysis of a Kilauean Parental Magma A. Woronow, A. M. Reid, J. H. Jones		1761

An Interpretation of 14C Measurements of Weathering Products in SNC Meteorites I. P. Wright, M. M. Grady, C. T. Pillinger		1762

Total Electron Yields and Total Fluorescence Yields of Albite and Lunar Soil Simulants JCS-1 and MLS-1 C. Y. R. Wu, F. Chen, D. L. Judge, K. Tan		1763

Stable Nickel Isotope Abundances in Type I Deep-Sea Spheres and in Nicke-rich Alberta (Canada) Spherules S. Xue, G. F. Herzog, G. S. Hall, D. Bi, D. E. Brownlee		1764

High-Temperature Vaporization of Al-Silicates: Experimental Results O. I. Yakovlev, Yu. P. Dikov, M. V. Gerasimov, F. Wlotzka		1765

Global Thermal Metamorphism on the Eucrite Parent Body A. Yamaguchi, G. J. Taylor, H. Takeda, K. Keil		1766

Re-searching for Martian Rocks from Diogenite-Diogenitic Achondrites K. Yanai		1767

AEM Study of the Metal Phases in Meteorites C.-W. Yang, D. B. Williams, J. I. Goldstein		1768

The Near Radio Science Investigation D. K. Yeomans, A. S. Konopliv, J. P. Barriot		1769

Spatial and Areal Distribution of Lunar Mare Deposits in Mare Orientale and South Pole/Aitken Basin: Implications for Crustal Thickness Relationships R. A. Yingst, J. W. Head III		1770

Chemical Compositions of Refractory Inclusions in Axtell, A CV3 Chondrite of the Oxidized Subgroup S. Yoneda, S. B. Simon, L. Grossman		1771

Fractality of Venusian Ejecta Outflows J. You, K. Kauhanen, J. Raitala		1772

Is Non-Linear, Rapid Cooling Plausible for Chondrule Formation? Evidence from Olivine Zoning Profiles Y. Yu, R. H. Hewins		1773

The Shapes of Opaque Grains of Primitive Achondrites and the Differentiation of Primitive Achondrites K. Yugami, H. Takeda, M. Miyamoto		1774

Simulated Craters on Venus K. Zahnle		1775

Erosion of Martian Atmosphere According to Plasma Experiments Data A. V. Zakharov		1776

Images of Vesta with the Planetary Camera of the Hubble Space Telescope B. Zellner, A. Storrs, E. N. Wells		1777

Anomalous H2O Concentrations over Tharsis: Analysis of Equilibrium Models A. P. Zent, R. M. Haberle, J. R. Murphy		1778

Natural Thermoluminescence Evidence for Major Differences in the Thermal History of EH and EL Chondrites Y. Zhang, P. H. Benoit, D. W. G. Sears		1779

An Examination of Hypotheses of Formation for the Enigmatic Massive Deposits in Amazonis Planitia, Mars J. R. Zimbelman		1780

The Isotopic Composition of Interstellar Graphite from the Murchison Meteorite: Evidence for Supernova Mixing E. Zinner, S. Amari, C. Travaglio, R. Gallino, M. Busso, S. Woosley		1781

CA in Olivine of H-Chondrites J. Zipfel, S. Weinbruch, H. Palme		1782

Evidence for Shock Melting and Parent Body Heating in CR and CV Chondrites M. E. Zolensky, P. C. Buchanan		1783

Iron-and Iron-Nickel Sulfides in Chondritic Interplanetary Dust Particles M. E. Zolensky, K. L. Thomas		1784

A Model of the Venus Atmosphere Evolution Along with Titanhematite-Magnetite-Pyrite Buffer M. Yu. Zolotov		1785

Phase Relations in the Fe-S-O System: Titanhematite-Magnetite-Pyrite Equilibrium as a Buffer of Venus Atmospheric Composition M. Yu. Zolotov		1786

Temporal Changes of Carbonates Stability on the Venus Surface M. Yu. Zolotov		1787

"Bursts" of Dust from the Jovian System H. A. Zook, E. Gruen, M. Baguhl, D. Hamilton, G. Linkert, N. Siddique, R. Forsythe, J. L. Phillips		1788

The Lunar Dust Exosphere and Clementine Lunar Horizon Glow H. A. Zook, A. E. Potter, B. L. Cooper		1789

The NEAR Laser Ranging Experiment M. T. Zuber, D. E. Smith, A. F. Cheng, T. D. Cole		1790

Gravity, Topography and the Geophysics of the Moon from the Clementine Mission M. T. Zuber, D. E. Smith, G. A. Neumann, F. G. Lemoine		1791

Mars Without Tharsis M. T. Zuber, D. E. Smith, J. W. Robbins		1792

26st Lunar and Planetary Science Conference

TABLE OF CONTENTS