HiRISE: Slumping terraces on a crater wall

This image shows the western rim of a well-preserved 8.5-kilometer (about 5 miles) diameter impact crater. The wall features a slumped terrace that extends all the way around the crater diameter (the adjacent image show the rest of the terrace). This slumped terrace, a result of the crater formation process, gives the crater a concentric ringed appearance. Terraces are an expected feature in Martian craters of this size or larger, as the material strength of the surface is overcome by the force of all-of-the-sudden-missing… [More at link]