Bulletin A. M. N. H. 



Vol. XIX, Plate LVIII. 



I'leistoceiieiHeceii 



Pli ocene ( Bl,i,.c.,) 

 Miocene (Loup Fork) 



Explorations of the 

 American Museum 

 IS99-1901, under 

 J.W.Gidley. 



10 £U 



50 60 



' 100 Miles. 



Pleistocene = Rock Creek Beds. 

 Pliocene = Blanco Beds. 

 Miocene (Loup Fork) = Clarendon Beds. 

 Miocene = Panhandle Beds. 



