DEVONIAN SYSTEM : WETWIN SHALES. 



2i1 



Wetwin Fauna — continued. 



DEVONIAN OF 

 AMERICA. 



Lower. 



Mid- 

 dle, 



O 



60 



o 



CO 



3 

 O 

 M 



a 



o 



o 



o 



a 

 o 

 -*-> 



a 

 w 



Upper. 



o 



c 



^3 

 O 



X 



X 



X 



Europe. 



Remarks. 



Mid. Dev., Poland . 



Dev., Russia. 



Dev., Belgium. N. France. 



N. France. 



aff. Ch. oriental! ft 

 v. Loczy, Dev., 

 Yunnan. 



Dev., Europe. 



