Inverted Fluvial Channels and Craters with Ejecta Rays
Inverted Fluvial Channels and Craters with Ejecta Rays
PSP_007394_1750  Science Theme: Sedimentary/Layering Processes
The lower part of this image shows well-defined overlapping channels, which have inverted topography (i.e., they were once low spots that have been filled in with sediments and now eroded in a such a way that they appear as topographically high regions).

The channels have a winding and intersecting geometry indicating the shifting of the channels over time, a feature consistent with the flow of water in rivers. The channels have small craters that have excavated the channel materials and ejected them to form well-defined rays. There are dark slope streaks (toward the top of the image) showing transport of fine dust down the slope of an eroded bedrock terrain.

Written by: John Grotzinger  (19 March 2008)

This is a stereo pair with ESP_019736_1750.
Acquisition date
23 February 2008

Local Mars time

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266.6 km (165.7 miles)

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47°, with the Sun about 43° above the horizon

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36.0°, Northern Spring

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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.