COEEELATIOlSr OF EARLY CEETACEOUS FLORAS. 93 



With reference to the age of the above flora, it is to be observed that the species are 

 almost entirely different from those of the middle and upper Cretaceous, that they include 

 some forms usually regarded as Jurassic, but that the greater number have the facies of 

 the Lower Cretaceous. It is also observable that no augiospermous exogens are included, 

 though had these been present at least in any considerable numbers they could scarcely 

 have escaped detection. In the next succeeding or Mill Creek G-roup plants of this type 

 occur, though not in large numbers. In the Potomac Formation of Fontaine there are, 

 however, considerable numbers of true exogens. 



These facts seem to indicate that the Kootauie flora belongs to the lowest portion of 

 the Cretaceous, and may be a little older than that of the main pait of the Potomac 

 Formation. It will be observed that while individuals of some species are abundant in 

 the collection, they are in a condition so imperfect that some doubts must rest on their 

 identification, and farther investigation may throw much light on their age and affin- 

 ities. There can, however, be scarcely any doubt as to their general reference to the 

 Neocomian Group of the Lower Cretaceous, and to the lower part of the earlier or Lower 

 Cretaceous as held by the Canadian Geological Survey, and as recently fully illustrated 

 for the United States in the Bulletin of the U. S. G-eological Survey. ' 



' White, No. 82, Correlation Papers, 1891. 



