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Ridges in Cydonia Mensae

July 22, 2022
This image acquired on March 28, 2022 by NASA's Mars Reconnaissance Orbiter shows a ridge standing prominently in this scene, left behind as the surroundings were eroded, perhaps marking inverted erosion of an ancient fluvial channel.
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A ridge stands prominent in this scene, left behind as the surroundings were eroded, perhaps marking inverted erosion of an ancient fluvial channel. The ridge is made of material more resistant to erosion and, considering the craters on its flanks, was formed long ago.

Erosion continues to this day: boulders that have fallen from the ridge are evident, scattered along the sides. Sand has begun to form small dunes adjacent to the ridge.

The map is projected here at a scale of 25 centimeters (9.8 inches) per pixel. (The original image scale is 30.1 centimeters [11.9 inches] per pixel [with 1 x 1 binning]; objects on the order of 90 centimeters [35.4 inches] across are resolved.) North is up.

This is a stereo pair with ESP_073599_2100.

The University of Arizona, in Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., in Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.

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