Pollastro, Richard M. <br/><br/>
Composition, clay mineralogy ,and diagenesis of the Simpson Group (Middle Ordovician), Grady County, Oklahoma / 
by Richard M. Pollastro. 
 - [Washington] :  United States Government Printing Office,  1991 
 - iv, 19 p. :  ill. (some col.) ;  28 cm. 
 - Evolution of sedimentary basins--Anadarko basin ;  ch. H U.S. Geological Survey bulletin ;  1866 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sandstone--Anadarko Basin<br/>Geology, Stratigraphic--Ordovician<br/>Geology--Anadarko Basin<br/>Geology--Oklahoma--Grady County
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Simpson Group
<br/><br/><label>Dewey Class. No.: </label>552.5