Holden Crater was once filled by at least *two* different lakes. The sediments deposited in those lakes are relatively light-toned where exposed, as we see in this observation .

Each layer represents a different point in time and perhaps a changing environment for Martian life, if it existed. The elongated ridges with sharp crests are sand dunes.

NB: North is to the left in the cutout image.

Written by: Alfred McEwen  (13 April 2017)

More info and image formats at http://hirise.lpl.arizona.edu/ESP_011542_1530

Image: NASA/JPL/University of Arizona