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The history of rivers on Mars is an important constraint on Martian climateevolution. The timing of relatively young, alluvial fan-forming rivers isespecially important, as Mars' Amazonian atmosphere is thought to have been toothin to consistently support surface liquid water. Previous regional studiessuggested that alluvial fans formed primarily between the Early Hesperian andthe Early Amazonian. In this study, we describe how a combination of a globalimpact crater database, a global geologic map, a global alluvial fan database,and statistical models can be used to estimate the timing of alluvial fanformation across Mars. Using our global approach and improved statisticalmodeling, we find that alluvial fan formation likely persisted into the last~2.5 Gyr, well into the Amazonian period. However, the data we analyzed wasinsufficient to place constraints on the duration of alluvial fan formation.Going forward, more crater data will enable tighter constraints on theparameters estimated in our models and thus further inform our understanding ofMars' climate evolution.

The Timing of Alluvial Fan Formation on Mars