PALEOBOTANY BERRY. 



397 



from the Wealden floras of England, Belgium or Germany; the 

 similar floras from Japan, the Kootenai flora of Montana and Brit- 

 ish Columbia, or even from the Barremian flora of Eussia, France, 

 and England. The so-called Urgonian flora of Greenland contains 

 two or three dicotyledonous leaves, but there is some uncertainty re- 

 garding their exact age and they may be somewhat younger. Sim- 



Fig. 37.— Restoration of Sagenopteris elliptiea Fontaine, from the Lower Cretaceous of Virginia (aft er Berry). 



ilar indefinite dicotyledonous remains have recently been recorded 

 from Australia and New Zealand. 



There is, however, satisfactory evidence of flowering plants in 

 strata referred to the Aptian stage, based not only upon foliage but 

 upon petrified wood, with structure preserved. Toward the close of 

 the Lower Cretaceous in its uppermost stage (Albian), angiosperms 

 become a considerable element in the flora, constituting 30 per 

 cent of the uppermost Potomac (Patapsco) flora, IT per cent of 



