Inverted Relief
Some places on Mars show inverted relief. In these locations, a stream bed may be a raised feature, instead of a valley. The inverted former stream channels may be caused by the depositon of large rocks or due to cementation. In either case erosion would erode the surrounding land and leave the old channel as a raised ridge because the ridege will be more resistant to erosion. An image below, taken with HiRISE of Miyamoto Crater shows a ridge that is an old channel that has become inverted.
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Inverted Channel in Miyamoto Crater, as seen by HiRISE. The scale bar is 500 meters long.
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CTX context image for next image that was taken with HiRISE. Note long ridge going across image is probably an old stream. Box indicates area for HiRISE image.
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Example of inverted terrain in Parana Valles region, as seen by HiRISE under the HiWish program.
Read more about this topic: Margaritifer Sinus Quadrangle
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