"Charlie Flats" - Sol 20 (Approximate True Colors; credits: NASA/JPL-Caltech)

Caption NASA originale: "This image from the Mars Exploration Rover Opportunity's PanCam shows a region of the rock outcrop at Meridiani Planum, Mars, dubbed Charlie Flats.
This region is a rich science target for Opportunity because it contains a diverse assortment of small grains, pebbles and spherules, as well as both dark and light soil deposits.
The area seen here measures approximately 0,6 mt (about 2 feet) across.

The smallest grains visible in this image are only a few mm in size. The approximate true color image was acquired on Sol 20 of Opportunity's mission with PanCam filters red, green and blue".