From top to bottom:
On the left, the edge of Victoria Crater on Mars as seen by the robotic geologist Opportunity. On the right, an overlook of Shafer Canyon at Utah's Dead Horse Point, near Canyonlands National Park.
An orbital view into Mars' Becquerel Crater. On the right, Shafer Canyon again.
Layers of sandstone in Victoria Crater. Layers at the side of the “Park Avenue” trail in Arches National Park, Utah. (Both images in natural color.)
Another section of the wall in Victoria Crater. Sandstone layers found in the backcountry of Canyonlands National Park.
A Martian mesa seen from orbit by the Mars Reconnaissance Orbiter. Another view looking down from Dead Horse Point.