Cape St. Vincent (natural - but sligthly darkened - colors; MULTISPECTRUM processing; credits: Lunexit)

Caption NASA:"The cliff in this image from Opportunity's PanCam is informally named Cape St. Vincent. It is a promontory approx. 12 mt (39 feet) tall on the Northern Rim of Victoria Crater, near the farthest point along the Rover's traverse around the rim. Layers seen in Cape St. Vincent have proven to be among the best examples of meter scale cross-bedding observed on Mars to date. Cross-bedding is a geologic term for rock layers which are inclined relative to the horizontal and which are indicative of ancient sand dune deposits. In order to get a better look at these outcrops, Pancam Super-Resolution (SR) imaging techniques were utilized.
SR is a type of imaging mode which acquires many pictures of the same target to reconstruct a digital image at a higher resolution than is native to the camera.
These SR images have allowed scientists to discern that the rocks at Victoria Crater once represented a large Dunefield, not unlike the Sahara desert on Earth, and that this Dunefield migrated with an ancient wind flowing from the North to the South across the Region. Other Rover chemical and mineral measurements have shown that many of the ancient sand dunes studied in Meridiani Planum were modified by surface and subsurface liquid water long ago.

This is a Mars Exploration Rover Opportunity PanCam image acquired on Sol 1167 (May 7, 2007), and was constructed from a mathematical combination of 16 different blue filter (480 nm) images".