Contributions to the geology and mineral resources of the Midcontinent Rift system.
Series: U.S. Geological Survey bulletin ;; 1970
Publisher: U.S. G.P.O.; For sale by Book and Open-File Report Sales, U.S. Geological Survey
Published: 1992
Place of publication: Washington; Denver, CO
Language: eng
Subjects: Geology -- Middle West.; Mines and mineral resources -- Middle West.; Keweenawan Rift.
Notes: Includes bibliographical references.
Table of contents: title: ch. A. Revisions of stratigraphic nomenclature within the Keweenawan supergroup of northern Michigan / by William F. Cannon and Suzanne W. Nicholson; title: ch. B. Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keweenaw Peninsula, Michigan / by Suzanne W. Nicholson.