The global distribution and morphologic characteristics of fan-shaped sedimentary landforms on Mars

Fan-shaped sedimentary landforms on Mars are important geomorphic markers of past water flow and characterizing the distribution morphology these features can yield insights into planet's climatic evolution. We present a new database 1501 martian fan-shaped that builds upon previous surveys uses Context Camera images. This comprehensive global survey includes both alluvial fans putative deltas, which we term scarp-fronted fan deposits (SFDs), across entire surface. classified each based their as fans, channelized SFDs, smooth terraced SFDs. Martian highly concentrated in high southern tropical latitudes while SFDs more common near equator. Both found at lower elevations than Late Noachian to Early Hesperian valley networks, suggesting change locations stable liquid water. Alluvial within impact craters preferentially located north, south, east facing slopes, location highest rim topographic relief; together observations support orographically-influenced precipitation snowmelt runoff source. For every collected morphologic data, compare with terrestrial fans. Relationships between catchment vary little surface, relatively similar processes. Although stratigraphic evidence deltaic deposition is lacking, previously conducted experiments along depositional basins generally formation. Crater counts indicate many Amazonian craters, indicating significant fluvial erosion occurred during Mars' recent history. • Most date Periods. Consistent implies formed under processes environmental conditions. The setting scarp fronted supports