Dark-Toned Unit Exposed atop Crater Ejecta in Meridiani Planum
Dark-Toned Unit Exposed atop Crater Ejecta in Meridiani Planum
PSP_003392_1825  Science Theme: Sedimentary/Layering Processes
This image shows the contact between two geologic units: a cratered plains unit and an etched terrain unit.

The cratered plains are relatively smooth and dark, while the brighter etched terrain consists of smooth plains and dune fields.

The etched terrain occupies the lowest portions of an approximately 120-kilometer valley with a wide variety of landforms suggestive of wind erosion. Both units partially cover the ejecta from an approximately 20-kilometer crater directly to the northeast of the image.

Written by: Jennifer Griffes  (2 May 2007)

This is a stereo pair with PSP_002680_1825.
Acquisition date
17 April 2007

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
271.3 km (168.6 miles)

Original image scale range
31.6 cm/pixel (with 1 x 1 binning) so objects ~95 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
54°, with the Sun about 36° above the horizon

Solar longitude
221.0°, Northern Autumn

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  340.7°
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Full resolution JP2 download
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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.