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 deposition of large rocks or due to cementation. In either case erosion would erode the surrounding land but leave the old channel as a raised ridge because the ridge will be more resistant to erosion. An image below, taken with HiRISE shows sinuous ridges that may be old channels that have become inverted.
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Meandering Ridges that are probably inverted stream channels. Image taken with HiRISE.
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CTX image of craters with black box showing location of next image.
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Image from previous photo of a curved ridge that may be an old stream that has become inverted. Image taken with HiRISE under the HiWish program.
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Sinuous Ridges within a branching fan in lower member of Medusae Fossae Formation, as seen by HiRISE.
Read more about this topic: Aeolis Quadrangle
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