Showing the Location of sections and collecting localities and the boundary between the Ordovician and Silurian Systems. Detached from: The stratigraphy and paleontology of the Ordovician rocks of Indiana / by R. E. Cumings. In Indiana Department of Geology and Natural Resources thirty-second annual report ... 1907. Indianapolis : Wm. B. Burford, 1908. Page 605. Imprint: Indianapolis : 1908 Dimensions: 67 x 37 cm; Scale: Approximately 1:126,720. 2 miles = 1 inch