Layers in a Central Mound in Gale Crater
Layers in a Central Mound in Gale Crater
PSP_001422_1750  Science Theme: Sedimentary/Layering Processes
This image shows a portion of the central mound in the impact crater Gale that is of interest to scientists because it is composed of light-toned layered deposits.

The layered deposits could have formed in a water environment if a lake once filled the crater. Alternatively, particles suspended in the atmosphere, such as dust or volcanic ash, could have built up the layers over time.

By using HiRISE images to see details in the layers, such as how their thicknesses vary horizontally and vertically, scientists can narrow down the potential origins.

The paucity of impact craters on the layered deposits indicates that either the deposits are very young, or more likely that they are being eroded to remove these craters. Wind erosion has modified the layers after they formed, creating both sharp corners and rounded depressions along the surface. Meter-size boulders are visible at the base of steep cliffs, but the scarcity of boulders elsewhere suggests most of the erosion is occurring by the wind rather than downslope movement of material.

Written by: Cathy Weitz  (10 October 2007)

This is a stereo pair with PSP_001620_1750.
Acquisition date
15 November 2006

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
262.4 km (163.1 miles)

Original image scale range
26.2 cm/pixel (with 1 x 1 binning) so objects ~79 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
57°, with the Sun about 33° above the horizon

Solar longitude
135.6°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  30.5°
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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.