Drilling the hole in Windjana (center) shook loose some windblown sediment that had accumulated around the outcrop.
NASA description: This image was taken by Navcam: Right B (NAV_RIGHT_B) onboard NASA’s Mars rover Curiosity on Sol 617 (2014-05-02 03:07:41 UTC).
Sol 617 raw images (from all cameras), and Curiosity’s latest location map.