Ophir Chasma Etched Rock

THEMIS has taken some great pictures of Valles Marineris, the largest canyon in the solar system. If this canyon were on Earth, it would stretch from New York to Los Angeles. Image of the Day toured some of the canyons that make up this vast system.
The hill formation on the bottom half of the image separates Ophir (northern) and Candor (southern) Chasmas. The top half of the image shows an interesting wind etched rock formation in Ophir Chasma.