Geology of volcanic rocks in the south half of the Ishpeming greenstone belt, Michigan /
Bornhorst, Theodore J.
Johnson, R. C.(Rodney C.)
Washington, DC : U.S. G.P.O. ; Denver, CO : For sale by USGS Map Distribution,
1993.
Title on p. [4] of cover: Volcanic rocks, south half Ispeming greenstone belt, Michigan.
Includes bibliographical references (p. 13).
Volcanic ash, tuff, etc.
Geology, Stratigraphic
Geology