Paleontology of the Eureka District

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U.S. Government Printing Office, 1884 - 298 pages

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Page 4 - ... a sparse fragmentary fauna which closely resembles in general character the fauna of the similar upper Devonian black shales of the eastern continental area. In these western sections there is a remarkable difference in the range and habit of species. " Some species," as Mr. CD Walcott has shown, "have reversed their relative position in the group as they have been known heretofore, and others have a greater vertical range.

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