Uplifted Bedrock in the Central Peak of an Impact Crater
Uplifted Bedrock in the Central Peak of an Impact Crater
ESP_020929_1360  Science Theme: Geologic Contacts/Stratigraphy
Large impact craters expose deep bedrock. After the transient cavity forms, the crater floor rebounds and creates a permanent structural uplift, typically equivalent to about 10 percent of the crater diameter.

A crater approximately 70 kilometers wide like this one can raise up and expose bedrock that was approximately 7 kilometers lower in elevation prior to the impact. Deeper rocks are usually older, and on Mars the oldest rocks are interesting because they are more likely to have been altered by water and provide clues to ancient environments and processes.

This image reveals good bedrock exposures with diverse rock types (as indicated by colors and textures).

Written by: Alfred McEwen  (23 February 2011)

This is a stereo pair with ESP_021707_1360.
Acquisition date
13 January 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
253.6 km (157.6 miles)

Original image scale range
50.8 cm/pixel (with 2 x 2 binning) so objects ~152 cm across are resolved

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50 cm/pixel and North is up

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Solar incidence angle
55°, with the Sun about 35° above the horizon

Solar longitude
216.4°, Northern Autumn

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North azimuth:  96°
Sub-solar azimuth:  19.4°
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NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.