2 Canadian Record of Science. 



placed at the base of the table as a representative of the 

 Urgonian or JSTeocomian ; or, at the very least, should be 

 held as not newer than the Shasta group of the United 

 States geologists, and the lower sandstones and shales of 

 the Queen Charlotte Islands. It would seem to correspond 

 in the character of its fossil plants with the oldest Cre- 

 taceous floras recognized in Europe and Asia, and with that 

 of the Kome formation in Greenland, as described by Heer. 

 No similar flora seems yet to have been distinctly recog- 

 nized in the United States, except, perhaps, that of the 

 beds in Maryland, holding cycads, and which were referred 

 many years ago by Tyson to the Wealden. 



The second of these plant- horizons, separated according 

 to Dr. Gr. M. Dawson, by a considerable thickness of strata, 

 is that which he has called the Mill Creek beds, and which 

 corresponds very closely with that of the Dakota group, as 

 described by Lesquereux, and that of the Atane and Patoot 

 formations in Greenland, as described by Heer. This fills 

 a gap, indicated only conjecturally in the table of 1883. 

 Along with the plants from the Dunvegan group of Peace 

 Eiver, described in 1883, it would seem to represent the 

 flora of the Cenomanian and Turonian divisions of the Cre- 

 taceous in Europe. 



Above this we have also to intercalate a third sub-flora, 

 that of the Belly Eiver series at the base of the Fort Pierre 

 group. This, though separated from the Laramie proper 

 by the marine beds of the Pien e and Fox Hill groups, 

 more than 1,700 feet in thickness, introduces the Laramie 

 or Danian flora, which continues to the top of the Cre- 

 taceous, and probably into the Eocene, and includes several 

 species still surviving on the American continent, or repre- 

 sented by forms so close that they may be varietal mej ely. 



Lastly, the subdivision of the Laramie group, in the 

 last report of Dr. G. M. Dawson, into the three members 

 known respectively as the Lower or St. Mary Eiver series, 

 the Middle or Willow Creek series, and the Upper or Por- 

 cupine Hill series, in connection with the fact that the 

 fossil plants occur chiefly in the lower and upper members, 

 enables us now to divide the Laramie flora proper into two 



