Upper Devonian marine-nonmarine transition, southern Pennsylvania.

By: Walker, Roger GMaterial type: TextTextReference number:806662Series: General geology report ; G62.Publication details: Harrisburg [Topographic and Geologic Survey] 1972. Description: vi, 25 p. illus. (1 fold. in pocket) 23 cmSubject(s): Geology, Stratigraphic -- Devonian | Geology -- Pennsylvania
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