Geology
The bedrock in the valleys of the park consists of the Upper Devonian Catskill Formation, consisting of sequences of sandstone, siltstone, and shale. The mountains in the park are capped by the Mississippian Burgoon Sandstone, which is underlain by the transitional Devonian-Mississippian Rockwell Formation, consisting of crossbedded argillacious sandstone with some shale beds.
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