The Timing of Alluvial Fan Formation on Mars

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