Reull Vallis (Released 22 October 2002)

Reull Vallis (from the Gaelic word for planet) located in the Promethei Terra region of Mars' cratered southern hemisphere flows for over 1,000 km towards the Hellas basin. This THEMIS image shows a portion of the channel with its enigmatic lineated floor deposits. These deposits are most likely rich in volatiles such as ice. The southern wall of the channel exhibits an obvious spur and gully topography. Several round impact craters are visible on the channel floor. Numerous crescentic features are also observed on the floor material. Could these crescentic features be older flow distorted craters?