RECENT RESULTS FROM MRO HAVE SHOWN THAT SUBSURFACE AQUEOUS ALTERATION OF THE NOACHIAN CRUST WAS SURPRISINGLY HETEROGENEOUS AND THAT SOME AQUEOUSLY ALTERED DEPOSITS FORMED IN ENVIRONMENTS TRANSITIONAL BETWEEN EARLY NEUTRAL AND LATER ACIDIC ONE. WE PROPOSE TO USE CRISM 262-CHANNEL 200 M/PIXEL HYPERSPECTRAL MAPPING ("HSP") DATA THAT COVER ~33% OF MARS IN CONJUNCTION IMAGING DATA FROM MRO AND MARS ODYSSEY TO ADDRESS QUESTIONS POSED FROM THESE RESULTS. THE STRENGTH OF HSP DATA COMPARED WITH 72-CHANNEL MULTISPECTRAL MAPPING ("MSP") DATA THAT COVER>80% OF MARS IS CONTIGUOUS WAVELENGTH COVERAGE OVER MOST OF CRISM'S SPECTRAL RANGE. THE DENSER SPECTRAL SAMPLING: (A) INCREASES CAPABILITY TO DISTINGUISH WEAK ABSORPTIONS (B) DETECTS ABSORPTIONS NOT FORESEEN WHEN THE MSP CHANNEL SET WAS SPECIFIED AND (C) SUPPORTS ADVANCED NOISE REMEDIATION. WE WILL MODIFY EXISTING PROCEDURES DEVELOPED FOR TARGETED OBSERVATIONS TO FILTER CORRECT AND MOSAIC HSP DATA AND PRODUCE 5 REGIONAL MOSAICS TO ADDRESS THE FOLLOWING QUESTIONS: 1. HOW WIDESPREAD ARE DEEPLY BURIED OCCURRENCES OF PRE-NOACHIAN CA/FE CARBONATE AND WHAT DOES THEIR OCCURRENCE IMPLY FOR THE CHEMISTRY OF EARLY WET ENVIRONMENTS? 2. HOW CONTINUOUS IS AQUEOUS ALTERATION AT DEPTH AND WHAT IS THE BALANCE OF ALTERATION TO HYDRATED SILICA (AT LOWER WATER/ROCK RATIO) VS. PHYLLOSILICATE (AT HIGHER WATER/ROCK)? 3. WHAT IS THE DISTRIBUTION OF PHASES THAT IMPLY THE HIGHEST HEAT FLOWS (EPIDOTE PREHNITE) AND WHAT DOES THE ANSWER IMPLY FOR EARLY MARTIAN EVOLUTION? 4. HOW WIDESPREAD ARE ACID SULFATES IN LAYERED CLAY DEPOSITS AND WHAT TO THEY IMPLY FOR MARS' TRANSITION FROM A NEUTRAL TO ACIDIC WEATHERING ENVIRONMENT? THERE ARE THREE RESEARCH TASKS: 1. ADAPTATION OF PROCESSING AND FILTERING PROCEDURES DEVELOPED PREVIOUSLY FOR CRISM TARGETED OBSERVATIONS TO REMEDIATE NOISE AND ARTIFACTS IN THE HSP DATA. 2. PRODUCTION OF 5 REGIONAL MOSAICS OF HSP DATA TILED USING CRISM MULTISPECTRAL MAP TILE CONVENTIONS. 3. SPECTRAL MAPPING AND ANALYSIS CORRELATION OF MINERAL OCCURRENCES WITH MORPHOLOGIC FEATURES TO UNDERSTAND STRATIGRAPHIC RELATIONS AND CONSTRUCTION OF STRATIGRAPHIC COLUMNS USING CRATER SCALING RELATIONSHIPS WITH EXPOSURES ARE ASSOCIATED WITH IMPACTS. THIS WORK RESULT IN AN IMPROVED UNDERSTANDING OF MECHANISMS THAT AFFECTED THE MARTIAN CRUST AND EVOLUTION OF MARTIAN CLIMATE FROM THE PRE-NOACHIAN THROUGH EARLY HESPERIAN PERIODS. THIS WORK WILL ALSO RESULT IN GENERATION OF 2 PEER-REVIEWED PUBLICATIONS AND A SET OF NEW DATA PRODUCTS THAT WILL BE DELIVERED TO THE PLANETARY DATA SYSTEM GEOSCIENCES NODE.