Aeolis Mensae yardangs, as seen by HiRISE. Scale bar is 500
meters long. Click on image for better view of yardangs. Aeolis
Mensae is tableland feature in the Aeolis quadrangle of Mars.
Its location is centered at 2.9° south latitude and 219.6° west
longitude. It is 820 kilometres (510 mi) long and was named
after a classical albedo feature name. Inverted relief  Some
places on Mars show inverted relief, in which a stream bed may
be a raised feature, instead of a valley. The inversion may be
caused by the deposition of large rocks or by cementation. In
either case erosion lowered the surrounding land, but left the
old channel as a raised ridge because the stream bed is more
resistant to erosion. An image taken by HiRISE shows a ridge
that may be old channels that have become inverted. |This
article about the planet Mars or its moons is a stub. You can
help Wikipedia by expanding it.|