Buck Canyon sw/4 sec. 15, t8s,r4e 
Lakota formation (in part) 
24# Sandstone , light yellowish gray, very fine 
grained, parallel bedding; forms massive cliff* 
23* Clays tone, medium gray, fissile at base be- 
coming more massive with hackly fracture at 
top. 7’ 
22. Sandstone, gray mottled red, very fine grained 
to silt, irregular bedding. 5 
21* Claystone and silt? clays tone medium gray to 
brownish gray, unctious, silt mottled 
pur pli s h gray , massive. 7 ! 
20. Sandstone, orange gray to yellowish gray, 
very fine grained, massive. If 
19- Silts tone, gray to purplish gray, 
bedded, carbonaceous. 
thin 
7 ' 
