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.
Foerste, Aug. F. (Aug. Frederic),1862-1936.
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.