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Lakota formation 
2 -/ 
29 * Claystone , silty , light gray, minor clayey 
silts tone, massive 5 becoming less silty 
downward* Scattered orange ferruginous 
specks of weathered side rite ospherulites. 
4*3' 
28. Claystone , gray, mottled red , some ye 11 m 
stain, scattered ferruginous specks of 
weathered side rite . 
1*0 
27* Clays tone, as above but gray with yellow 
stain, scattered ferruginous specks of 
weathered side rite. Becoming silty 
downward . 
1*7 
Siltstone, massive, clayey at top, light 
gray to white, ferruginous specks of 
we a there d s ider ite thruout . 
5.6* 
25, Siltstone, friable, gray-white, local 
clayey lenses and scattered thin hard beds. 2 . 8 * 
