Terra Sirenum is a heavily cratered region of Mars’ ancient Southern Highlands. A blanket of dust, possibly cemented by ice, covers much of the ancient bedrock in these Martian middle latitudes, but impacts can expose buried materials in the resulting steep crater walls.

Here, a roughly 2-kilometer diameter crater reveals light-toned layered material on the floor of a much larger, infilled crater. A close-up view (north is down and the crater rim is at the top) shows that thin, pinkish and bluish layers overlie much more extensive yellow-hued layers. These varied colors likely mark different compositions, either from changing sediment sources or from differential weathering of previously deposited materials.

It is no wonder that we have sent so many Mars rovers into craters: they can be geological treasure troves!

ID: ESP_092552_1420
date: Saturday, 25 April 2026
altitude: 251 km (155.62 mi)

https://uahirise.org/hipod/ESP_092552_1420
NASA/JPL-Caltech/University of Arizona
#Mars #science #NASA