MULTI-RING IMPACT BASINS ARE THE LARGEST IMPACTS AND FORM IN THE EARLIEST HISTORY OF THE TERRESTRIAL PLANETS. THE MOON HAS OVER 40 OF THESE LARGE IMPACT FEATURES IN VARYING STATES OF PRESERVATION. BECAUSE THESE LARGE IMPACTS EXCAVATE MANY KILOMETERS OF CRUST DURING FORMATION STUDY OF BASIN EJECTA ALLOWS US TO MAKE INFERENCES ABOUT THE CRUSTAL COMPOSITION AND STRUCTURE AT EACH BASIN SITE. IN THE PAST WORK ON THESE FEATURES HAS BEEN HAMPERED BY INCOMPLETE COVERAGE AND IMPRECISE POOR QUALITY DATA. THE NEW GLOBAL DATA FOR THE MOON OBTAINED BY LUNAR RECONNAISSANCE ORBITER (LRO) AND OTHER RECENT MISSIONS ALLOW US TO EXAMINE THE EJECTA DEPOSITS OF LUNAR BASINS IN HIGH RESOLUTION WITH A VARIETY OF SENSING TECHNIQUES INCLUDING DETERMINATION OF THEIR CHEMICAL MINERALOGICAL AND PHYSICAL PROPERTIES. I PROPOSE TO STUDY THE MORPHOLOGY AND COMPOSITION OF BASIN EJECTA DEPOSITS ON THE MOON USING THESE NEW DATA SETS. NEW IMAGE AND TOPOGRAPHIC DATA FROM LRO PERMITS GEOLOGICAL MAPPING OF THE DISTRIBUTION OF BASIN EJECTA AND THEIR STRATIGRAPHIC RELATIONS TO OTHER UNITS. BUILDING ON MY PREVIOUS STUDIES OF LUNAR BASINS I WILL RE-MAP THE GEOLOGICAL UNITS OF SEVERAL BASINS INCLUDING THE IMBRIUM HUMORUM MOSCOVIENSE AND HUMBOLDTIANUM BASINS USING LRO IMAGES AND TOPOGRAPHIC DATA TO ELUCIDATE THE DISTRIBUTION AND OCCURRENCE OF BASIN EJECTA. THE NEW GEOLOGICAL MAPS WILL BE USED IN CONJUNCTION WITH ELEMENTAL AND MINERAL MAPS FROM THE CLEMENTINE AND LUNAR PROSPECTOR MISSIONS AND DETERMINE THE COMPOSITION OF INDIVIDUAL EJECTA UNITS. GEOLOGICAL MAPPING HAS IDENTIFIED PROBABLE DEPOSITS OF BASIN IMPACT MELT ON THE BASIS OF MORPHOLOGY OCCURRENCE AND COMPOSITION FOR THE ORIENTALE IMBRIUM AND CRISIUM BASINS. IN THE COURSE OF THIS STUDY I WILL SEARCH FOR ADDITIONAL DEPOSITS OF IMPACT MELT AT THESE AND OTHER BASINS OCCURRING BOTH AS REMNANTS OF THE INTERIOR MELT SHEET AND AS ISOLATED EJECTED MELT DEPOSITS. THE NEW GEOLOGICAL MAPPING AND COMPOSITIONAL INFORMATION WILL PERMIT ASSESSMENT OF THE HYPOTHESIS THAT VERY LARGE IMPACT MELT BODIES PRODUCED BY BASIN-FORMING IMPACTS MIGHT DIFFERENTIATE IN PLACE PRODUCING A SEQUENCE OF ROCKS THAT COULD BE MISTAKEN AS PRODUCTS FROM AN ENDOGENOUSLY PRODUCED MAGMA. FINDING BASIN IMPACT MELT IS IMPORTANT TO CHARACTERIZE THE STRUCTURE AND COMPOSITION OF THE LUNAR CRUST. IN ADDITION IMPACT MELTS ARE THE ONLY MATERIALS SUITABLE FOR THE DETERMINATION OF ABSOLUTE AGES FOR THE BASIN-FORMING IMPACTS AND THUS THESE SITES ARE HIGH-PRIORITY FOR FUTURE EXPLORATION INCLUDING ROBOTIC AND HUMAN SAMPLE RETURN MISSIONS. STUDY OF BASIN MELT AND EJECTA USING REMOTE SENSING DATA WILL SHED LIGHT ON THE PROCESSES OF LARGE-BODY IMPACTS AND THE SUBSEQUENT GEOLOGICAL EVOLUTION OF THE LUNAR CRUST. AS LARGE BASINS FORMED IN THE EARLY HISTORY OF BODIES OF THE SOLAR SYSTEM THIS WORK WILL SHED LIGHT ON THE EARLY GEOLOGICAL EVOLUTION OF ALL TERRESTRIAL PLANETS. DATA TO BE USED IN THIS WORK (CLEMENTINE MULTISPECTRAL IMAGES LUNAR PROSPECTOR ELEMENTAL MAPS KAGUYA AND LRO LASER ALTIMETRY AND LRO WAC DTM AND NAC IMAGES) ARE ALL AVAILABLE THROUGH THE PDS SYSTEM.