Plate XVI. 



Areal Map of North American Upper Devonian. 



Professor Schuchert's reconstruction of Upper Devonic 

 palseogeography. The Appalachian and Columbian land-masses 

 are represented as more shrunken in area than during earlier 

 periods of the Devonian, and a westward extension of the Miss- 

 issippian sea receives the name of Oklahoman. In the Cordil- 

 leran region it is probable that a larger land-mass was elevated 

 above sea level than is here conjecturally represented. 



360 



