Bornhorst, Theodore J. <br/><br/>
Geology of volcanic rocks in the south half of the Ishpeming greenstone belt, Michigan / 
by Theodore J. Bornhorst and Rodney C. Johnson 
 - Washington, DC :  U.S. Government Printing Office,  1993 
 - iii, 13 p. :  ill., maps ;  28 cm. 
 - U.S. Geological Survey bulletin ;  1904 .
<br/><br/> Title on p. [4] of cover: Volcanic rocks, south half Ispeming greenstone belt, Michigan 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Volcanic ash, tuff, etc.--Michigan<br/>Geology, Stratigraphic--Archaean<br/>Geology--Michigan
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Kitchi Formation<br/>Mona Formation
<br/><br/><label>Dewey Class. No.: </label>552.209774