r 
Ar ch Cre e k Sect i on 
Fall River formation (in part) 
i 
Sands ton 
be dde d 
A 
i in a -grained, 
o s e-land . na te d , 
* eta 
ar 1 '*- : 
gp thin- 
, W v*, wOme massive beds 
partings of shaly silts tone • Local Fe 
Wvil • r UL i!ia kill » L , 
*? " CP 
impregnation* Forms buff, shelving ledge 
f 
I 
Sands tone, as in 26 above but more thinly 
to inter 
-2 
bedded and becoming shaly. 
bedded shale and silts tone about 2* from 
top, and into dark silty shale in lower 
foot* 
0* 
•Siltstone, hard, interhadde4 with cL 
silts tone and dark gray silty shale* 
fragments common* Weathers to crumbly 
gray-white and yellow-gray ledges* 
. trA or 
Plant 
6 * 0 * 
* 
■^nt stone, Cjws. 
clays tone; 
layej r , and silty 
hard dark gray to black with numerous 
plant fragments. 
Dis conformity 
