36 



C O N T R I B U T I O N S TO P A L iE O N T O L O G Y 



to show a closer relationship to the underlying Fox Hills fauna of the Upper Creta- 

 ceous than to any known early Tertiary fauna.^ 



Summary — The evidence of the fioras here discussed substantiates to a con- 

 siderable degree the correlation of late Cretaceous and early Tertiary formations 

 suggested previously by other Hnes of evidence. Figure 8 shows the generaUy 



N.W. Colo. 



S.W. Wyo. 



S. Wyo. 



S. Colo. 



E. Colo. 



E. Wyo., E. Mont, 

 and Dakotas 



FiQ. 8 — Correlation chart showing proposed changes by dotted lines and arrows. 



accepted correlation chart of the formations involved, modified from Miss Wil- 

 marth's charts as suggested by the U. S. Geological Survey.^ Further proposed 

 changes based on the present floral studies, indicated by dotted lines and arrows, 

 are the Laramie age of part of the Vermejo-Raton sequence and the Fort Union 

 age of the Cannonball, Tullock and Ludlow members of the Lance formation. The 

 present study supports the conclusion of Dane and Pierce that the lower Dawson 

 and the Arapahoe-Iower Denver should be referred to the Upper Cretaceous. 



SUMMARY 



The primary purpose of the present report is the description and discussion 

 of the flora coUected from the terrestrial sedimcnts conformably overlying the 



1 Stanton, T. W., U. S. Geol. Surv. Prof. Paper 128-A, 13, 15, 1920; Dane, C. H., and Pierce, W. G., Bull. Am. Assoc. 

 Petr. Geol., vol. 20, no. 10, 1327. 1936. 



2 Dane, C. H., and Pierce, W. G., op. cit., 1327. 



