Title
Revisions of stratigraphic nomenclature within the Keweenawan supergroup of northern Michigan / by William F. Cannon and Suzanne W. Nicholson. Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake Volcanics, Keweenaw Peninsula, Michigan / by Suzanne W. Nicholson.
Published
[Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by Book and Open-File Report Sales, 1992.
Physical Description
iii, 8, iii, 57 p. : ill., maps ; 28 cm.