KEY TO MAP 



PT. Puerro, Torrpjon, tind Wasatch of San 



Juan basin. New Moxico Basal und lower Eocene. 



BH. Wasatch of Bighorn Baain. Wyoming . Lower Eocene. 

 W. Wasatch (typical) . Evanaton. Wy- 



ominft Lower Eocene. 



WB. Wind Ilivcr, Wyoming Lower Eocene. 



H. Huerfano. Colorado Lower and middle Eocene. 



B. Bridgcr, Wyoming Middle Eocene. 



"WK. ■■ Washakie." Wyoming Middle ami upper Eocene. 



U. Uinta. Utah Middle and upper Eocene. 



12. White River deposits along Swift 



Current Creek, Assinihoia, Canada Lctwer tHiKocene. 

 10. White River deposits along Pipestone 



(^reek, Montaiui ., Lower Oljgocene. 



2. Typical White River and Rosehud. 



South Dakota Oligoeene and Miocene. 



1. White River. Monroe Creek, and 



Harrison. Nebraska Oligoccue and Miocene. 



4. Pawnee Buttes section (" Pawnee 

 Creek," "Martin Canyon," "Cedar 

 Creek." "Horsetail Creek.") Colo- 

 rado Oligoeene to middle Mioeeni 



7. John Day. Mascalt, and Rattlesnake, 



Oregon Oligoeene, Miocene, and Pli< 



8. " Fort Logan " and Deep River. Mon- 



11. " Flint Creek," Montana 



6. "Panhandle." " Clarendon," Blanco, 

 and " Rock Creek." Texas 



17. " Nebraska," and underlying beds, 



Nebraska 



6. " Santa Fe marls," New Mexico 



9. " Madison Valley," Montana 



3. " Republican River." Kansas 



13. "Archer." Florida 



14. "Loup River." Nebraska 



18. Silver Lake. Oregon 



15. Ashley River. South Carolina 



16. Port Kennedy, Pennsylvania 



19. Potter Creek cave, California 



20. Conard fissure. Arkansas 



3 to Pleistocene. 



Miocene. 

 Upper Mi( 

 Upper Mi( 



Lower Pliocene. 

 Upper Pliocene. 

 Lower Pleistocene. 

 Pleistocene. 

 Middle Pleistocene. 

 Mi<ldle Pleistocene. 

 Upper Pleistocene. 



Flo. 20. — Map of the United States, showing the general Mountain and Great Plaius Hegious ; also the typical localities of the principal formations, sections, and deposits 



