The January special issue of Icarus offers 21 papers on results from the Univ. of Arizona-managed HiRISE camera on the Mars Reconnaissance Orbiter.
The papers cover "Martian landforms shaped by winds, water, lava flow, seasonal icing and other forces."
Among the highlights addressed are:
Valleys associated with light-toned layered deposits in several locations along the plateaus adjacent to the largest canyon system on Mars suggest low-temperature alteration of volcanic rocks by acidic water both before and after formation of the canyons.
The youngest flood-lava flow on Mars, found in the Elysium Planitia region and covering an area the size of Oregon, is the product of a single eruption and was put in place turbulently over a span of several weeks at most.
New details are observed in how seasonal vanishing of carbon-dioxide ice sheets in far-southern latitudes imprints the ground with fan-shaped and spider-shaped patterns via venting of carbon-dioxide gas from the undersurface of the ice.