Layers Filling Crater in Schiaparelli
NASA/JPL/University of Arizona
Layers Filling Crater in Schiaparelli
PSP_005897_1790  Science Theme: Sedimentary/Layering Processes
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This image shows a small crater in the northwest part of Schiaparelli Crater, near the equator of Mars. The small crater (roughly 2 kilometers in diameter, similar to Meteor Crater in Arizona) was filled with light, layered sediments that are now exposed as bulls-eye rings within the crater.

Moving out from the crater center, the layers appear to be stair-stepped so that each layer is slightly lower than the previous one; the innermost layers are the youngest, deposited on top of a stack of sediments. The concentric pattern could be simply due to each layer being eroded slightly more than the one below it, but another factor may be the shape of the layers. If each layer draped over the interior of the crater and the region was eroded to a nearly flat surface, the layers would appear as a succession of rings. Topographic data of sufficient resolution would enable us to distinguish between these two models.

If the layers are draped, this provides some information about how they formed. Dust or volcanic ash settling from the atmosphere is likely to drape the surface; by contrast, deposits from rivers or lakes are likely to fill preferentially in the low areas.

In the RGB false-color image, much of the layered material appears pale. Some layers appear dark blue or red-brown in places; this may be due in part to trapping of wind-blown material in troughs or on rough surfaces. Ridges on the surface appear to protect it from erosion. These could be ripples of sand formed by wind and later hardened, or resistant fins called “deformation bands” created by rock deformation.

Written by: Colin Dundas   (6 March 2008)

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Acquisition date
29 October 2007

Local Mars time:
14:17

Latitude (centered)
-0.958°

Longitude (East)
13.865°

Range to target site
272.0 km (170.0 miles)

Original image scale range
27.2 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
9.4°

Phase angle:
25.7°

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

Solar longitude
339.0°, Northern Winter

North azimuth:
97°

Sub-solar azimuth:
351.2°
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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.