Back to today's photo, just a quick comment: who says rocks aren't pretty? There are some interesting details, but take a moment to enjoy to appreciate the esthetic quality of the exposure.
Here's a crop from above ("below") the cobble:
Another structure, which puzzles me a little, is visible in both yesterday's and today's shots. (The crop is from yesterday's.)
Photo unmodified. July 21, 2016. FlashEarth location.