This HiRISE image shows several smaller craters that formed on the floor of Saheki Crater, an 85-kilometer diameter impact crater north of Hellas Basin.
The western portion of this crater is covered by alluvial fan-like deposits that emanate from channels that cut into the crater rim. This HiRISE image— indicated by a white box atop of a colorized THEMIS temperature image of Saheki —was taken just east of the central uplift, where vividly colored materials now lie exposed in a kilometer-sized crater.
An enhanced color infrared image shows a close-up of the 1-kilometer crater and its contents. The wall of the crater shows a rainbow-like array of bedrock and deposits. Much of this material has been eroded over time and has slumped downwards towards the crater floor, leaving behind chalk-like streaks of color. We can also see reddish and dark-toned layered deposits to the south now covered by the crater’s green-toned ejecta.
Written by: Eric Pilles, Livio Tornabene, Christy Caudill and Ian Pritchard (audio: Tre Gibbs) (4 May 2016)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_044913_1580
Image: NASA/JPL/University of Arizona