Revisions of stratigraphic nomenclature within the Keweenawan supergroup of northern Michigan /

Bibliographic Details
Main Authors:	Cannon, William F. (Author), Nicholson, Suzanne W. (Author)
Format:	Government Document eBook
Language:	English
Published:	[Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 1992.
Series:	U.S. Geological Survey bulletin ; 1970 A-B. Contributions to the geology and mineral resources of the midcontinent rift system ; ch. A-B.
Subjects:	Geology, Stratigraphic > Proterozoic. Rhyolite > Michigan > Keweenaw Peninsula. Volcanic ash, tuff, etc. > Michigan. Bergland Group (Mich.) Copper Harbor Conglomerate (Mich.) Porcupine Volcanics (Mich.) Portage Lake Volcanics (Mich.) Geology, Stratigraphic. Proterozoic Geologic Period. Rhyolite. Volcanic ash, tuff, etc. Michigan. Michigan > Bergland Group. Michigan > Copper Harbor Conglomerate. Michigan > Keweenaw Peninsula. Michigan > Porcupine Volcanics. Michigan > Portage Lake Volcanics. From 570 million to 2 billion years ago
Online Access:	https://purl.fdlp.gov/GPO/gpo70339

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