Layered Rocks in a Crater in Arabia Terra
Layered Rocks in a Crater in Arabia Terra
PSP_002574_1865  Science Theme: Sedimentary/Layering Processes
This image shows a ground surface composed of many thin light– and dark–toned layers.

These layers are mostly parallel with adjacent layers, and sets of layers often form intricate curved shapes that are reminiscent of wood grain.

What we see here is actually a series of rock layers that have been sequentially laid down on the floor of a large impact crater. These layers create interesting geometric patterns because they initially accumulated as large ripples, or sand dunes.

Subsequently, the ground surface was eroded away by the wind, revealing these underground layers of bedrock.

Written by: Chris Okubo  (11 April 2007)

This is a stereo pair with PSP_003418_1865.
Acquisition date
13 February 2007

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
273.7 km (170.1 miles)

Original image scale range
27.5 cm/pixel (with 1 x 1 binning) so objects ~83 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
56°, with the Sun about 34° above the horizon

Solar longitude
183.0°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  359.3°
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IRB color
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Merged IRB
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IRB color
map-projected   (638MB)

Black and white
map-projected  (719MB)
non-map           (670MB)

IRB color
map projected  (220MB)
non-map           (535MB)

Merged IRB
map projected  (301MB)

Merged RGB
map-projected  (308MB)

RGB color
non map           (502MB)
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

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Color label
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IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:

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.