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The Foerstia Zone of the Ohio and Chattanooga Shales
James Morton SchopfJ. F. Schwietering
出版U.S. Government Printing Office, 1970
URLhttp://books.google.com.hk/books?id=x0ZDi07lNa8C&hl=&source=gbs_api
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註釋An explanation for the stratigraphic zonation of the fossils and a report on a newly discovered occurrence of the Foertia zone in western Ohio.