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
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.
A Scarp in the Arabia Region
Pictured here appears to be the edge of a blast radius of a large meteorite impact crater with smaller and more recent cratering interrupting its circumference.
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.
Touring a Dusty Region
Dusty regions on Mars are often considered to look boring in HiRISE images because the dust obscures surface features.