Aorounga impact craterHidden in the remote Sahara desert in Chad are the eroded remnants of an impac

Aorounga impact craterHidden in the remote Sahara desert in Chad are the eroded remnants of an impact crater some 350 million years old, part of a possible chain of three that resulted from a fragmented impactor. The remnants of the main crater are some 17km across and contain a central peak (formed by the rebound of the crust as the bolide hit), surrounded by a sand filled trough and an outer crater ring. The lines running from top right to bottom left are a set of yardangs, long ridges of more resistant rock eroded out by the dominant winds, while the troughs between them are also filled with orangey yellow sand dunes (dark streaks in the radar image that is peering under the top layer of sand).LozImage credit: ½: synthetic aperture radar image 22x28km and astronaut photo: NASA 3: JAXA/ESAhttp://bit.ly/1Nfqp26http://go.nasa.gov/1kFDIh0http://neo.jpl.nasa.gov/images/chad.html -- source link

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