Clark, Sandra H. B. <br/><br/>
Barite nodules in Devonian shale and mudstone of western Virginia / 
by Sandra H. B. Clark and Elwin L. Mosier. 
 - [Washington]:   [United States Government Printing Office],   [1989].  
 - iv, 30 p. :  ill., tables, maps ;  28 cm. 
 -  1880 .
<br/><br/>Includes bibliographical references (p. 27-30). 
<br/><br/> A proposed origin of barite nodules in Devonian shale and mudstone of the Appalachian basin in western Virginia based on physical characteristics of the nodules and on the stratigraphy, paleoenvironment, and geochemistry of the shale and mudstone. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Devonian<br/>Barite--Virginia<br/>Barite--Appalachian Region
<br/><br/><label>Dewey Class. No.: </label>553.662