Here is some evidence showing structures on the rocks and the surface although they are very small.
You may have to concentrate for a while to spot them. Some of the structural formations are well-camouflaged.
This area is just one small part of the Shaler outcrop but there is a great deal of other evidence just waiting to be found at this particular location.
I have rectangled in green some of the more prominent anomalous objects that would appear to be built structures and not natural formations.