BULLETIN NO. 243 PL. V 
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ORDOViCIAN (M* 
CAMBRIAN 
ALGONKIAN 
to with chert Dolomite <ui<l sandstone Sandstone with some E 
iles with shale and some dolomite and shale 
low -magnesia limestone 
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00 miles 
Compiled from published sources and from the 
notes of members of the Iowa Geological Survey 
