Sheppard, Richard A. <br/><br/>
Zeolitic diagenesis of tuffs in the Miocene Chalk Hills formation, western Snake River Plain, Idaho / 
by Richard A. Sheppard. 
 - [Washington]:   [United States Government Printing Office],   [1991].  
 - iv, 27 p. :  ill., tables, maps ;  28 cm. 
 -  1963 .
<br/><br/>Includes bibliographical references (p. 18-19). 
<br/><br/> Silicic vitric tuffs south of Oreana are completely altered to clinoptilolite with or without smectite and opal-CT. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Volcanic ash, tuff, etc--Idaho--Chalk Hills Formation<br/>Zeolites--Idaho--Chalk Hills Formation<br/>Diagenesis--Idaho--Chalk Hills Formation<br/>Geology, Stratigraphic--Miocene<br/>Geology--Idaho
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Chalk Hills Formation (Idaho)
<br/><br/><label>Dewey Class. No.: </label>552.23