25 March 2013
The thick limestone stratum in the center of the photo has been stretched left-to-right. It exhibits pinch-and-swell structure, the first stage of boudinage. Small extensional fractures began to form in the boudin necks, accommodating the strain. Muddier strata above and below flowed into these boudin necks.
This is in the overturned limb of the fold, by the way: these strata have been tectonically inverted (flipped up-side-down).