Sol 4276, February 3, 2016. Two frames from the rover’s Pancam, rendered into false colors by Holger Isenberg, show faint differences among the surface materials at the foot of Knudsen Ridge. If the differences prove to be real, they may tell scientists about the history of alteration of these rocks by water. (Click image to enlarge.)
The ridge is an outcrop of broken and shattered rim material raised by the large impact that created 22-km-wide Endeavour Crater. More views of the ridge are here, here, and here.
Opportunity raw images, its latest mission status, a location map. and atmospheric opacity, known as tau.