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Small Crater in Oceanus Procellarum
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Small Crater in Oceanus Procellarum

December 6, 2012
The LROC NAC has imaged thousands of blocky craters similar to this example found in Oceanus Procellarum. The numerous boulders may be fragments of bedrock, regolith breccias formed by the impact itself, or a combination of both. Since a crater depth of excavation is roughly one tenth its diameter, this small crater has probably distributed material from about 75 meters depth around its rim. Usually, ejecta material on the rim comes from the deepest part of the crater, and ejecta farther away from the crater comes from shallower depths. As you look at these boulders, you are witnessing a history of the emplacement of this mare. This unnamed 740 m diameter crater has bouldery walls and is morphologically similar to many <1 km diameter craters in the mare. Image width is 847 m, LROC NAC M127328861L [NASA/GSFC/Arizona State University].