Figure 18. F1 isoclinal syncline, facing downward to the west, and axial planar cleavage (Sc) that is cut by southeast-dipping crenulation cleavage (Scc). This outcrop of phyllite of the Swift Run Formation (Zsp) is near reference locality 6 (pl. 1) of the Purcell Knob antiformal syncline. Brunton compass shown for scale.

U.S. Geological Survey, U.S. Department of the Interior
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