Ancient Lake Sediments in a Crater
NASA/JPL/University of Arizona
Ancient Lake Sediments in a Crater
ESP_037122_2165  Science Theme: Tectonic Processes
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This image shows some interesting fractured materials on the floor of an impact crater in Arabia Terra.

There is a channel entering the crater and exiting it (see CTX image). This channel, along with an unusual deposit on the lowest part of the floor, suggests that there was once an ancient lake that deposited sediments here.

Our enhanced-color sample shows layered deposits, some with polygonal patterns, as might be expected from lake sediments. The fracturing of these deposits might have resulted from the sudden breaching of the crater rim, draining the lake.

Written by: Alfred McEwen   (16 July 2014)

This is a stereo pair with ESP_035843_2165.

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Acquisition date:28 June 2014 Local Mars time:15:21
Latitude (centered):35.962° Longitude (East):351.819°
Range to target site:327.9 km (204.9 miles)Original image scale range:65.6 cm/pixel (with 2 x 2 binning) so objects ~197 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:26.5° Phase angle:77.9°
Solar incidence angle:52°, with the Sun about 38° above the horizon Solar longitude:152.7°, Northern Summer

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