Impact craters expose the subsurface materials on steep slopes. However, these slopes often experience rockfalls and debris avalanches that keep the surface clean of dust, revealing a variety of hues, like in this enhanced-color image, representing different rock types. The bright reddish material at the top of the crater rim is from a coating of the Martian dust.
The long streamers of material are from downslope movements. Also revealed in this slope are a variety of bedrock textures, with a mix of layered and… [More at link]