Scoured Bedrock on the Floor of Eos Chasma
Scoured Bedrock on the Floor of Eos Chasma
ESP_012940_1655  Science Theme: Geologic Contacts/Stratigraphy
The scoured and scabby floor of Eos Chasma, located east of Valles Marineris, is covered with dunes or ripples and eroded craters. The reddish-brown color likely represents older, eroded basalt. Much of this erosion may have been accomplished by water.

An eroded crater exposes compositional differences below the surface: the bluish tones are probably fresher, boulder-rich exposures of basalt and the lighter-toned material near the base of the crater wall may have a different composition. The bottom of the crater is filled with material that is similarly-toned to the surface of Eos Chasma, and was likely eroded and transported there by the wind.

Written by: Sharon Wilson  (13 May 2009)
Acquisition date
30 April 2009

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
263.5 km (163.8 miles)

Original image scale range
53.0 cm/pixel (with 2 x 2 binning) so objects ~159 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
47°, with the Sun about 43° above the horizon

Solar longitude
257.0°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  345.6°
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non-map           (120MB)

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Black & white is 5 km across; enhanced color about 1 km
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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.