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    map background search result map search result map Correlation Chart of Upper Devonian rocks at Olean and Wirt townships, Cattaraugus and Allegeny counties. Stratigraphic column of formations in Wellsville 15' quad., 2 sheets. (from O/P NYSGS bulletin 326). Stratigraphic column of formations in Wellsville 15' quad., 2 sheets. (from O/P NYSGS bulletin 326).