AGE OF TEE LIGNITIC DETERMINED BY ITS FLORA. 



343 



plants of tliis lasl locality, if not a di^dnct Cretaceous flora, at least a mun- 

 ber of representatives of the types of the Dakota gronp. 



The thirty species recognized in tiie specimens of I'oint of Eocks have 

 been described above; but the deduction derivable from the determination of 

 these plants in regard to evidence of geological age will be more clearly under- 

 stood by a comparative table pointing out the affinity or identity of characters 

 with species of other localities. The i)oints of comparison are indicated witii 

 the flora of the European and of the Arctic Miocene, of the Canadian Ter- 

 tiary, of the European Eocene, of Golden, Black Buttes, and the Cretaceous 

 in general. 



TdhU i/idicafitig the relation of the fossil plants of Point of Rocks. 



[An. Hi^ifies analogous ; Id., identical.] 



