1946. 2012-07-09T19:26:42Z. 2022-12-06T16:58:03Z. Collins, W. H. (William Henry), 1878-1937. Bureau of Geology and Topography. English. Public. Ontario and Falconbridge Region.
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1946. 2018-01-23T14:42:00Z. 2018-01-23T14:42:00Z. De Witt, Wallace, Jr., 1920-2012. U.S. Geological Survey. English. cartographic image. Public. Pennsylvania, Ohio, Ohio., and Pennsylvania. Mississippian and From 310 to 345 million years ago.
