[[top left corner]] 24 [[/top left corner]] 
E-18" earthy Is jammed with Cystiphyllum 
F-12" Earthy blue, yellow weathering Is with Atrypa & chert. 
G. - Earthy Is packed with Cystiphyllum 13 
[[left margin]] 6666H [[/left margin]] 
H - 24" of blue earthy yellow weathering Is with some scattered 
Cystiphyllum Phosphate nodules 
I - Maquoketa 
[[left margin]] 6666H [[/left margin]] 
Excellent exposure of the Devonian now opened on the road just across 
bridge on Lincoln Co by Y about 1/2 mile W of Brussels. 
Exposures also in Creek. On N side of road is Maquoketa and on south 
side of road is complete section of Devonian with gray shale above it. 
A total of 1 2', ten feet of the Is and about 2' of ss. The ss is irregular in 
thickness and may not be present everywhere because we did not see it 
in the Creek section. 
Spinatrypa is fairly common in the upper part of the section but small 
Cystiphyllum is the most conspicuous element 
G. Arthur Cooper - Field notes, 1 966 
Transcribed and Reviewed by Digital Volunteers 
Extracted Nov-02-2015 11:09:05 
Smithsonian Institution Transcription Center, Smithsonian Institution Archives 
