SCIENCE GOALS AND OBJECTIVES SEDIMENTARY ROCKS ON MARS ATTEST TO A VARIETY OF AQUEOUS AND ATMOSPHERIC PROCESSES THROUGHOUT ITS HISTORY. DEPOSITIONAL FEATURES SUCH AS BEDFORMS PROVIDE VITAL INFORMATION REGARDING PAST AND PRESENT ENVIRONMENTAL CONDITIONS. FOR EXAMPLE SURFACE INVESTIGATIONS AT THE MERIDIANI PLANUM (OPPORTUNITY) AND GALE CRATER (CURIOSITY) LANDING SITES HAVE FIRMLY ESTABLISHED THAT SOME OF THE ~4 GA ROCK RECORD IS COMPOSED OF SEDIMENT THAT WAS TRANSPORTED BY FLOWING WIND AND WATER AS EVIDENCED BY ABUNDANT CROSS-BEDDING AND ALTERATION PRODUCTS. ACROSS THE SURFACE OTHER ISOLATED OCCURRENCES THAT MEET THE MORPHOLOGIC CRITERIA FOR DUNES AND RIPPLES ARE EVIDENT IN ORBITAL DATA YET APPEAR DEGRADED AND SUPERPOSED BY CRATERS BOULDERS OR GEOLOGIC UNITS. SOME OF THESE OCCURRENCES ARE HYPOTHESIZED TO BE BEDFORMS CONSTRUCTED IN AEOLIAN AND FLUVIAL DEPOSITIONAL SETTINGS YET THEY ARE LARGELY PRESERVED IN AN INTERMEDIATE STAGE AS PART OF THE ROCK RECORD AN UNCOMMON CIRCUMSTANCE ON EARTH. THESE LANDFORMS HEREAFTER TERMED PALEO-BEDFORMS DISTINCT GROUPS OF LINEAR TO CRESCENTIC POSITIVE-RELIEF FEATURES OF A CHARACTERISTIC WAVELENGTH THAT SHOW EVIDENCE FOR LITHIFICATION ARE THE SUBJECT OF THIS PROPOSED STUDY. THIS PROPOSED MDAP STUDY IS DRIVEN BY THE PRIMARY OBJECTIVE: CHARACTERIZE THE SPATIAL DISTRIBUTION ORIGIN AND GEOLOGIC CONTEXT OF PRESERVED ANCIENT BEDFORMS ON MARS.