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10. Shale ,blocky, dark gray, carbonaceous frag 
ments. Locally a clay stone. 
10 
9. Shale, silty, with .3’ clayey siltstone 
at base, weathers gray. 
1 . 6 * 
8. Shale, as in above. 
1.3 
i 
7 « Clays tone , 
brown. 
silty to sandy, tough, Ixgmtic 
Sandstone, fine-grained, massive, weathers 
yellow-gray. Some laminae of lignitic, 
gypsiferous silty shale and sandstone in 
basal .2* 
Total thickness Lakota (roundedO) 
2 « 4 
1 
