Checking out Hidden Valley’s northern wall with the Mastcam (100mm lens) reveals layered rocks, some crossbedded (three-frame composite).
NASA description (middle frame): This image was taken by Mastcam: Right (MAST_RIGHT) onboard NASA’s Mars rover Curiosity on Sol 710 (2014-08-05 13:34:03 UTC).
Sol 710 raw images (from all cameras), and Curiosity’s latest location map.