The rim and interior of a crater nicknamed "Bonneville" dominate this 180-degree, false-color mosaic. Spirit recorded this view on the rover's 68th sol, March 12, 2004, one sol after reaching this location. The rover remained here in part to get this very high-resolution, color mosaic, from which scientists can gain insight about the depth of the surface material at Bonneville and make future observation plans. On sol 71, Spirit was instructed to drive approximately 15 meters (49 feet) along the crater rim to a new vantage point.

http://marswatch.astro.cornell.edu/pancam_instrument/bonneville.html