Ordovician and Silurian graptolite succession in the Trail Creek area, central Idaho -- a graptolite zone reference section, by Claire Carter et al.

Title:	Ordovician and Silurian graptolite succession in the Trail Creek area, central Idaho -- a graptolite zone reference section
Author:	Carter, Claire
Author:	Churkin, Michael, 1932-
Author:	Geological Survey (U.S.)
Note:	U.S. Government Printing Office, 1977

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Subject:	From 405 to 500 million years ago
Subject:	Graptolites
Subject:	Graptolites -- Idaho -- Blaine County
Subject:	Graptolites -- Idaho -- Custer County
Subject:	Idaho -- Blaine County
Subject:	Idaho -- Custer County
Subject:	Ordovician Geologic Period
Subject:	Paleontology
Subject:	Paleontology -- Idaho -- Blaine County
Subject:	Paleontology -- Idaho -- Custer County
Subject:	Paleontology -- Ordovician
Subject:	Paleontology -- Silurian
Subject:	Silurian Geologic Period
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