The valley floors especially in the northern part of the image show linear ridges and grooves that can be traced along the course of flow. These textures suggest that icy material once slowly flowed down the valleys, possibly in the form of debris-covered glaciers similar to rock glaciers found on Earth. Rock glaciers are bodies of ice interspersed with boulders and rocky debris found primarily in regions of permafrost on high mountain ranges or at polar latitudes. The glacier-like deposits could represent leftovers of a retreating ice sheet that has covered the region during recent Martian ice ages. Former climatic conditions on Mars obviously.