The formation of gullies on Mars today Colin M. Dundas Alfred S. McEwen Serina Diniega Candice J. Hansen Shane Byrne Jim N. McElwaine 10.6084/m9.figshare.5624650.v1 https://geolsoc.figshare.com/articles/figure/The_formation_of_gullies_on_Mars_today/5624650 Gully initiation in Raga crater (48.1°S, 242.5°E). 2017-11-22 10:29:18 Raga gully Mars today Gully initiation crater formation Geology