V. S. GEOLOGICAL SURVEY 



MONOGRAPH 55 PLATE XII 



A. CONTACT BETWEEN TITANOTHERIUM ZONE (LOWER OLIGOCENE) AND PIERRE SHALE (CRETACEOUS), NEAR 

 MOUTH OF CEDAR CREEK, BIG BADLANDS, S. DAK. 



Orcodo-n zone in the di^ance to the right. Am. Mus. negative 35997 





v> 



Uirvtco C J 



Dif^^a?^ 





B. BADLANDS SOUTH OF WHITE RIVER, UTAH 



Showing Diplacodon 5one (level Uinta C 1, upper Eocene) in foreground and level Uinta C 2 in diilance- (Compare fig. 66.) Am. 



Mus. negative 17665 



