Composition and properties of the Pierre Shale and equivalent rocks, northern Great Plains region :  mineralogical and chemical study, including trace elements, of marine and nonmarine rocks of late Cretaceous age / 
by Leonard G. Schultz ... [et al.] 
 - Washington, D.C. :  United States Geological Survey,  1980 
 - vi, 114 p. :  ill. (1 fold. col. in pocket) ;  29 cm. 
 - Geological Survey professional paper ;  1064-B .
<br/><br/> Includes index 
<br/><br/>Bibliography: p. 82-84 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Cretaceous<br/>Shale--Great Plains
<br/><br/><label>Dewey Class. No.: </label>551.77