Today's Mars Photo is of a crater in Nereidum Montes as taken by the CTX camera on the Mars Reconnaissance Orbiter. The crater has numerous gullies on its southwest walls and rim. There are also two instances of ear-shaped (lobate) material that is associated with gullies within the crater. This features provide additional evidence that water once existed in excess on Mars. It is hoped that a link between the lobate material and interior gullies can be firmly established when HiRISE takes more hi-resolution images of the crater.
Click on the image below to see the original, full page photo from the HiRISE site.