The suggested area in this observation is characterized by a group of cones, shield-like features, and round mounds. They are a few hundred meters to kilometers in diameter but their heights are unknown.
Possible explanations for their formation include sedimentary (mud) volcanism and magmatic volcanism. HiRISE data would be essential for distinguishing these hypotheses.
This caption is based on the original science rationale.
Written by: HiRISE Science Team (13 July 2011)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_022381_2000
Image: NASA/JPL/University of Arizona