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    • Frederick Formation Geologic Columns 

      Reinhardt, J. (Baltimore: Maryland Geological Survey, 1974)
      This map is Plate 2 from Reinhardt, J., “Stratigraphy, Sedimentology, and Cambro-ordovician Paleogeography of the Frederick Valley, Maryland”. Baltimore: Maryland Geological Survey, 1973 (Report of Investigations No. 23).
    • Geologic Map of the Frederick Valley 

      Reinhardt, J. (Baltimore: Maryland Geological Survey, 1974)
      This map is Plate 1 from Reinhardt, J., “Stratigraphy, Sedimentology, and Cambro-ordovician Paleogeography of the Frederick Valley, Maryland”. Baltimore: Maryland Geological Survey, 1973 (Report of Investigations No. 23).