[[left margin - circled]] 37 [[/circled]] 
381 b[[/left margin]] 
6686 - Reentrant in Mo. River bluffs - entered on east side and 
encountered Ordovician low in the bluff. On east side the Ord is directly 
overlain by Chouteau. We saw no Devonian. A short distance west in 
another ravine a few inches of ss were seen above the Ord. The ss 
contained Favosites. The ss lies on flat-bedded dolomite as in quarry. 
About 5' above the ss is a ledge of T of hard gray (dark) Is which looks 
like Calloway. This immediately followed by Chouteau with Shumardella. 
The Devonian is thus about 6' thick but the identification of all but ss is 
questionable 
[[left margin]] [[image labels]] 
F 
3' E 
12'D 
20" C 
3' B 
A 
[[/image labels]] [[/left margin]] 
Next gully west has 10" [[insertion]] with small pebbles [[/insertion]] of ss 
and about 4' of Devonian lithology overlain by Chouteau. 
Tracing to bluff looking at the RR about in center of reentrant we have a 
fair section of Devonian 
A-Ordovician 
B-3 feet of limy sandstone in a hard ledge that juts out on the slope. 
C- 20 inches of thin bedded shaly limestone becoming 
G. Arthur Cooper - Field notes, 1966 
Transcribed and Reviewed by Digital Volunteers 
Extracted Nov-02-2015 11:09:05 
Smithsonian Institution Transcription Center, Smithsonian Institution Archives 
