135 Million year old sandstone bluffs stand sentinel over the El Malpais- badlands- near Grants, New Mexico, US. The detailed texture here is a high dynamic range close-up of the top surface of this very ancient stone. This is in the El Malpais National Monument.
Canon 5D MK II, Tamron 28-300 VC lens @77mm, 3 exposures in bright sunlight, auto exposure bracketed, edited in Aperture and with the Photomatix plugin
Also available as an iPhone 4/4S case: