Fan-Shaped Deposit in Valles Marineris Trough
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Fan-Shaped Deposit in Valles Marineris Trough

July 8, 2011
This image shows the western half of a fan-shaped deposit in a small trough in the Valles Marineris system.

The fan is at the mouth of a smaller canyon, and may consist of material eroded from the canyon by flowing water in the distant past. The fan itself shows many layers, each likely corresponding to a different episode in the history of the system.

At the base of the fan, a series of light-toned layers are visible. Since these deposits extend beyond the base of the fan in addition to being different in color and texture, they may indicate a different type of sediment deposition before the fan was emplaced.

Written by: Colin Dundas

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