This image targets a 3-kilometer diameter crater that occurs within the ejecta blanket of the much older Bakhuysen Crater , a 150-kilometer diameter impact crater in Noachis Terra.
Impact craters are interesting because they provide a mechanism to uplift and expose underlying bedrock, allowing for the study of the subsurface and the geologic past. An enhanced color image shows the wall of the crater, which exposes layering as well as blocks of rock. There is a distinctive large block in the upper left of the crater wall, generally referred to as a âmega-block.â It is an angular, light-toned, highly fragmented block, about 100 meters across. Several smaller light-toned blocks are also in the crater wall, possibly of the same rock type as the âmega-block.â
Ejecta blocks are thrown outward during the initial excavation of a crater, or are deposited as part of the ground-hugging flows of which the majority of the ejecta blanket is comprised. Through images like these, we are able to study the deeper subsurface of Mars that is not otherwise exposed.
Written by: Christy Caudill, Livio Tornabene, Ian Pritchard and Eric Pilles (audio: Tre Gibbs) (1 June 2016)
This is a stereo pair with ESP_044968_1575 .
More info and image formats at http://hirise.lpl.arizona.edu/ESP_044902_1575
Image: NASA/JPL/University of Arizona