Geology of volcanic rocks in the south half of the Ishpeming greenstone belt, Michigan - Bornhorst, Theodore J.; Johnson, R. C. (Washington, DC : U.S. Government Printing Office, 1993)
Title on p. [4] of cover: Volcanic rocks, south half Ispeming greenstone belt, Michigan
Keywords: Volcanic ash, tuff, etc. -- Michigan; Geology, Stratigraphic -- Archaean; Geology -- Michigan; Kitchi Formation; Mona Formation