The next photo in the 712 mastcam series and it has a lot going on. Still trying figure out some items and may never be able but here are the ones found so far. The arrows pointing at the dark spots in the sand I believe are wet spots and similar to what NASA pointed out when they announced finding water. Lots of interesting anomalies in the photo.
Mastcam: Right 2014-08-07 14:26:14 UTC – Original Image from Mars Rover Curiosity at Hidden Valley