"El Capitan" - an outcrop inside Eagle Crater - Sol 33 (False Colors; credits: NASA/JPL-Caltech)

Caption NASA originale:"This image, taken by the PanCam on the Mars Exploration Rover Opportunity, shows a close up of the rock dubbed "El Capitan" located in the rock outcrop at Meridiani Planum, Mars. This image shows fine, parallel lamination in the upper area of the rock, which also contains scattered sphere-shaped objects ranging from 1 to 2 mm (0,04 to 0,08") in size. There are also more abundant, scattered vugs, or small cavities, that are shaped like discs. These are about 1 cm (0,4") long".