A map of the counties of Franklin, Union, Fayette and Wayne 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 Cincinnati series of Indiana / E.R. Cumings. In 32nd Annual report of the Indiana Department of Geology and Natural Resources. 'Boundary after Foerste.' Scale approximately 1:126,720. 2 miles to the in.
