THRUST FAULTING IN SINKING VALLEY, BLAIR AND HUNTINGDON COUNTIES, PENNSYLVANIA
Sinking Valley, Pennsylvania, is floored by Cambro-Ordovician limestone and dolomite which are folded into an asymmetrical anticline overturned to the northwest. Information obtained from diamond-drill cores indicates an extensive thrust fault, accompanied by subsidiary branching offsets, which has displaced the steeply dipping northwestern limb of the anticline about 2 miles.