Layered Deposits in Ritchey Crater
NASA/JPL/University of Arizona
Layered Deposits in Ritchey Crater
PSP_003249_1510  Science Theme: Geologic Contacts/Stratigraphy
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This image shows eroding layered deposits in Ritchey Crater, a large impact crater in the Southern highlands.

Three general units are visible: a relatively dark upper layer, a light middle unit, and the floor material, which may be mostly obscured by dust. The dark cap layer appears to be relatively hard and resistant, while the light material is weak. Once the upper layer is removed, the light layer does not last long.

This subimage from the top center part of the image shows this stack. The dark unit is thin and breaking into boulders. The light material is actually divided into smaller layers, and is pervasively fractured. However, the boulders falling from the edge are mostly small and rarely remain intact if they move more than a few meters. The cracking of the layer could be due to water loss from the layer, or to regional tectonic effects such as stresses from burial and erosion. The base unit is partially covered by wind-blown ripples.

It is unclear how each of these layers formed. Volcanic ash layers, lake or stream deposits, or sandstone deposited by dunes can all produce horizontal layers. Unraveling the origin would provide important clues to Mars' past.

Written by: Colin Dundas   (19 May 2007)

This is a stereo pair with PSP_003526_1510.

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Acquisition date
06 April 2007

Local Mars time:
15:40

Latitude (centered)
-28.538°

Longitude (East)
309.366°

Range to target site
259.1 km (162.0 miles)

Original image scale range
25.9 cm/pixel (with 1 x 1 binning) so objects ~78 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
7.4°

Phase angle:
60.4°

Solar incidence angle
53°, with the Sun about 37° above the horizon

Solar longitude
214.1°, Northern Autumn

North azimuth:
96°

Sub-solar azimuth:
9.8°
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Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.