VOL. 22, 1910, PL. 28 



E V O N I A N 



^ILLINOIS 



% of St lou/s 



lonva. and Minnesah. East Wisconsin 



Northern /Irjfaj7sas 



CentraJ Oklahoma. 



iVanoo^an 



S>NeeV\arvd ?i\a\e 



C'uaVranoo^an 



Vlood^ni cJrtcrV 



Sfai^e(^uarr^ Is 



hmanm 



i/ay 



Is. 



Lime Creek sb. 

 _CedarVaJley_l_5__J Milwaukee -form 

 Wapsipinicon 



Locailv represented 



Linden 



Anamosa. ] 

 Ledair ( s+a^e 



WaAjbakee Is. 



owlin^Gr 



Guelph dol. 



LimniuiT 



dolomite 



HopUinlon dol. 



Rax:ine dol. 



Waukesha dol. 



X. oollfe -t' 



Mayville dol. 



Louisville 

 Bob 



Upper St.ClaJr 



St. ClaJr 



St. Clair 



mcraroD 



Unnajried dol. 

 BraJnard sh. 



^y Ft. Atkinson Is, 



a. shale 



•rrmTTn 



Maquokefa sh. 



C"" "Clirrlon ore bed" 



Shales of 

 Richmond a^e 

 ("X^incinnati shale") 



Brassfield 



Clermont sh. 



Wykoff Is. 



Dubuque dol. 



Cason sh. 



qm rrnnrn - 



Upper Polk Bayou 



Oolite 



Sylvan sh. 



Fernvale 



