Cannon, William F. <br/><br/>
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. 
 - [Washington]:   [United States Government Printing Office],   [1992].  
 - iii, A8, v, B57 p. :  ill., maps ;  28 cm. 
 -  1970 Contributions to the geology and mineral resources of the midcontinent rift systemChapter A, B .
<br/><br/> Chapters A and B are issued as a single volume and are not available separately. 
<br/><br/>Includes bibliographical references (p. A8) and (p. B35-B39). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Proterozoic<br/>Volcanic ash, tuff, etc--Michigan<br/>Rhyolite--Michigan--Keweenaw Peninsula
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Porcupine Volcanics (Michigan)<br/>Bergland Group (Michigan)<br/>Copper Harbor Conglomerate (Michigan)<br/>Portage Lake Volcanics (Michigan)
<br/><br/><label>Dewey Class. No.: </label>551.71509774