Fault-propagation fold in the Yeso Fm.

One set of faults are nearly parallel to the bedding planes; these are thrust faults indicating compressional stresses. The fold is termed a fault-propagation fold because it is the sliding of rocks along the thrust fault that caused associated strata to buckle and fold near the tip of the fault. The former presence of evaporite layers in these rocks (before they were dissolved) may have contributed to the abundance of small thrusts by providing planes of easy sliding.

This outcrop is at Stop 8 in our free: "A Geologic Guide to the Quebradas Back Country Byway" by Peter A. Scholle.