How exactly might have two craters lost a portion of their rims? (NASA/JPL-Caltech/UArizona)

Light-toned mounds on the floor of Kashira Crater exhibit signature of aluminum-phyllosilicates or hydroxylated silica in CRISM multispectral data. Mars Orbiter Camera images show networks of ridges on the mound surfaces, possibly resistant fractures resulting from alteration or cementation by fluids. Some surfaces have a polygonal texture. (NASA/JPL-Caltech/UArizona)

What is striking about this observation are the very high thermal-infrared contrasts that should provide a good look at the stratigraphy of this clay-rich region. This mineral diversity here might be of interest as a site for future exploration. (NASA/JPL-Caltech/UArizona)

Here on the plains to the west of Juventae Chasma, we see a patch of inverted, or perhaps fluvial, channel forms with superposed or decaying-in-place bedforms that have been acted upon by the wind. This patch is surrounded by a more heavily cratered darker-toned terrain. Is the patch maybe just comprised of sedimentary materials? (NASA/JPL-Caltech/UArizona)

This observation features an impact crater with a furrowed and pitted floor and a big, slump-like feature in its northern part. The crater floor is reminiscent of formations believed to be of glacial origin elsewhere on Mars, and our HiRISE image can provide clues to its nature. The terraced wall of the crater has blocky material reminiscent of craters...

This approximately 190-meter diameter circular depression appears to have an interesting interior shape in Context Camera data. This observation will assist in confirming that this is an impact crater and to determine what is causing the unusual interior appearance in the CTX data. (NASA/JPL-Caltech/UArizona)