Between Orson Welles and Ganges Chasma is a region where materials subsided and collapsed over underground cavities that had once held aquifers. This image shows an elongated collapse pit. There is evidence that the pit was once filled with water as the groundwater erupted to the surface. A closer view shows fine sedimentary layers exposed by erosion.
Dark
Light
North of Ganges Chasma lies Orson Welles Crater, whose floor contains broken up blocks we call chaotic terrain and which is the source for the major outflow channel Shalbatana Vallis.
Image: NASA/JPL/University of Arizona https://www.uahirise.org/hipod/ESP_070818_1780
Related Posts
Detecting Olivine near Noachis Terra
This observation shows the bedrock on the floor of a crater near Noachis Terra. This crater is unique because it has been very well characterized as being olivine rich.
Possible Clays and Chlorides near Columbus Crater
Data from other instruments, such as THEMIS and CRISM, imply that chlorides are present here; the CRISM data reveal that iron/magnesium clays are also present.
Layered Bedrock
This un-named crater in southwestern Arabia Terra contains a treasure!
Layered sediments are the key to the puzzle of Martian history. They tell us about the conditions that existed when the sediments were deposited, and how they changed over time.
An Impact Crater within Nanedi Valles
With this image, we can cross-dating the relative age of the impact with that of the valley system, as well as learning more about the fluvial and morphology characteristics of area.