MIOCENE PLOEA. 277 



Tilia antiqua, Juglans rhamnoides: in all, 9 species, the only ones relating 

 the group to the Miocene. Others of its plants are identified with species 

 of the Eocene Flora of the Laramie Group — Sabal Campbellii, especially, 

 which, sent in very large and numerous specimens from the hanks of the 

 Yellowstone River, indicated as Miocene, is abundantly found in the Lig- 

 nitic of the Raton Mountains and of Colorado ; Platanus Eaynoldsii, P. 

 Haydenii, and a few others, which, though not identified in the Eocene, are 

 related to its Flora by typical affinity; Aristolochia cordifolia, Catalpa cras- 

 sifolia, Pkyllites camosus, P. cupanioides, &c, all plants with coriaceous 

 leaves and of coarse tissue, like those of the Dakota Group; and with these, 

 Onoclea sensibilis, Corylus rostrata, Corylus Americana, common plants of the 

 present North American Flora. 



From these meagre data nothing appears definite but this : As the 

 fossil floras of Carbon and the Bad Lands are related by 10 identical 

 species, and those of the Bad Lands and Alaska by 13, these three groups 

 apparently represent the same stage of the North American Miocene. The 

 Flora of Carbon has only four species identified in that of Alaska; but this 

 lesser degree of affinity may be ascribed to difference in latitude. 



