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Stratigraphic column of formations in Wellsville 15' quad., 2 sheets. (from O/P NYSGS bulletin 326). Categories: Physical Item; Tags: Chart Correlation Chart of Upper Devonian rocks at Olean and Wirt townships, Cattaraugus and Allegeny counties. Categories: Physical Item; Tags: Chart Stratigraphic column of formations in Wellsville 15' quad., 2 sheets. (from O/P NYSGS bulletin 326). Categories: Physical Item; Tags: Chart