Mars’ Ma’adim Vallis and Gusev Crater

Mars’ Ma’adim Vallis and Gusev Crater

Fig. 8.23 . A mosaic of Viking images reveals the branching, winding valley network named Ma’adim Vallis, which is about 800 kilometers long. It drains from the heavily cratered terrain in the south (bottom) and breaches the southern rim of the Gusev Crater (top), which formed earlier and is about 150 kilometers in diameter. The smooth flat crater floor suggested it was filled with water and sediments, but the Mars Exploration Rover, Spirit, failed to find any water-related sediments in the hypothetical crater lake, perhaps because they have been covered by volcanic flows. (Courtesy of NASA/JPL/USGS.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University