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F all River formation, 
20, Siltstone and silty shale, minor fine- 
grained sandstone; thinly and irregu- 
larly interbedded; partings gray fissile 
shale. Uppermost silty beds Fe- stained. 2.0* 
19, Sandstone, fine-grained, thin- to thick- 
bedded, local ripple -marked and "worm" - 
tracked surfaces, buff- to brown -weather- 
ing . Upper 5 feet thinly bedded, locally 
cross-bedded, lower part with more 
massive beds. Upstrieam from, power- 
house whole unit thin-bedded. 19. 5' 
18. Siltstone, light gray, in thin, laminated 
beds, with black shale partings. Some 
irregular interbeds of fine-grained sand- 
stone, Weathers gray with red and yellow 
stain. Unit becomes more sandy laterally. 6.0 1 
17. Sandstone, fine-grained, even-bedded to 
cross-bedded, cross-laminated, some 
silty shale partings; weathers buff to 
brown, some iron impregnation at top 
and local red stain on bedding surfaces. 
Base includes coarse sandstone and some 
clay pellets. 
26 . 0 * 
