Subsurface Geologic Methods 



Plate 9. Typical shale patterns. (1) Puente shale formation, Cohon, California; 

 (2) Salinas shale formation, Santa Barbara County, California; (3) Monterey 

 shale formation, Santa Cruz, California; (4) Mowry shale formation, Casper, 

 Wyoming; (5) Black Diamond shale, Metalene Falls, Washington; (6) kerogen 

 (oil shale). Green River formation. Rifle, Colorado; (7) shale from Benton 

 formation, Golden, Colorado; (8) illite-glauconite shale, Granby, Colorado. 



