GEOLOGIC MAP OF MIDDLE ORDOVICIAN CARBONATE FORMATIONS IN NORTHWEST LEWIS AND PARTS OF SOUTHEAST JEFFERSON COUNTIES, NEW YORK

During portions of the 2003 summer and fall field seasons, we extended the formational contacts of the limestone units mapped by Johnsen (1971) in Jefferson County, NY into the northwest part of Lewis County, NY. We produced a geologic map of the area in Canvas 6.0, covering parts of seven 1:24000 quadrangles. The map illustrates the formational contacts as exposed in stream cuts in the Black River Valley region between the eastern Tug Hill Plateau and the western Adirondacks. The classical stream cuts described by 19th and 20th century workers (Clarke and Schuchert, 1899; Miller, 1910; Ruedemann, 1910; Kay, 1937; inter alia) were reexamined using the following formational names: Pamelia, Lowville and Watertown for the Black River Group and Napanee, Kings Falls, Sugar River, Denley, Steuben and Hillier for the Trenton Group. We present seven measured and described stratigraphic sections as well as a correlated stratigraphic cross-section of all our studied exposures.