Opportunity is next to the layered outcrop.
Great shots from Opportunity’s Navigation Camera.
http://marsrovers.jpl.nasa.gov/gallery/all/opportunity_n013.html
In the first images we got of these rocks two weeks ago, I pictured them as being much bigger.
They remind me of weathered limestone, like I see in central Texas. Even the small peaces of rock seen in the Microscopic Imager looked like weathered limestone. I can’t wait to find out what they really are.