18 SIE J. W. DAWSON ON THE MESOZOIC FLOE AS OP 



modern Viburnum ojiulus, aud the leaf is scarcely distinguishable from leaves of that 

 species taken from yonng and vigorous shoots, except in the auricles at the base. 

 Collected by G. M. D. at Shaganappi Point, near Calgary. 



VlHURNUM CaLGARIANUM, S. N. 



Leaf simple, nearly round, obtusely toothed at margin. Venation as in V. rotundifoUum, 

 Lesquereux, except that the ultimate venation is much coarser. The marginal teeth are 

 also much more rounded, being merely waves of the edge. 



This leaf is very near in general appearance to that described in my former memoir as 

 Ahiites insignis, from the Cretaceous of Vancouver Island. I believe, however, it is quite 

 distinct. 



Collected by Gr. M. D. at Shaganappi Point, near Calgary, Upper Laramie. 



Li the same beds with the above species are oval drupelets of the structure of those 

 of Viburnum, and which may have belonged to the same plants from which the leaves were 

 derived. 



Salisburia, Sp. 



Fragments of a flabellate leaf, similar in form and size to that of the modern ginkgo, 

 and also nutlets, occur in the sandstones of Shaganappi Point. 



V. — Geological Relations of the Florai^. 



In my memoir in the first volume of the Transactions of this Society, I have given 

 a table of the Cretaceous formations of the western Northwest Territories of Canada, pre- 

 pared by Dr. G. M. Dawson, and have fully stated the geological position of the plants 

 at that time described. The new facts above detailed now require us to intercalate in 

 our table three distinct plant-horizons not previously recognized in the western territories 

 of Canada. One of these, the Kootanie series, should probably be placed at the base of 

 the table as a representative of the TJrgonian or Neocomian, or, at the very least, should 

 be held as not newer than the Shasta group of the United States Geologists, and the 

 LoAver Sandstones and Shales of the Queen Charlotte Islands. It would seem to corres- 

 pond in the character of its fossil plants with the oldest Cretaceous floras recognized in 

 Europe and Asia, and with that of the Komé formation in Greenland, as described by 

 Heer. No similar flora seems yet to have been distinctly recognized 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. G. M. Dawson, by a 

 considerable thickness of strata, is that which he has called the Mill Creek series, and 

 which corresponds very closely with that of the Dakota group, as described by Lesquereux, 

 aud that of the Atané and Patoot formations in Greenland, as described by Heer. This 

 fills a gap, indicated only coujecturally in the table of 1883. Along with the plants 

 from the Dun vegan group of Peace Eiver, described in 1883, it would seem to represent 

 the flora of the Cenomanian and Turonian divisions of the Cretaceous in Europe. 



Above this we have also to intercalate a third sub-flora, that of the Belly River series 

 at the base of the Fort Pierre group. This, though separated from the Laramie i^roper by 



