We sent Opportunity a few meters uphill looking for the contact and are trying to get a quick composition and microscopic image on the outcrop. It looks like the Shoemaker Formation (impact breccia). If the rock has round spherules, it would be unlike the breccias we saw elsewhere along the ridge crest.
Here is latest map that I prpepared after the sol 3219 drive. The base image for this map is a mosaic of the local Navcam panoramas reprojected in vertical presepctive.