56 
are named and these comprise: 3 ferns, 3 eycadophytes, 3 coniferophytes, 
and 9 dicotyledons. 
One of the most abundant and characteristic fossils in the Upper 
Blairmore is Pseudocycas unjiga , first recorded by Dawson from the Dun- 
vegan sandstone and also represented in the supposed Dakota sandstone 
of the United States. There can be no question regarding the identity of 
this species, but it is not an especially good guide fossil in the field since 
it is liable to be confused with the superficially similar Dioonites buchianus 
abietinus which occurs in the Lower Blairmore and Lower Cretaceous 
horizons elsewhere. The distinguishing character of the Pseudocycas, 
readily discernible in well-preserved material, is the double midrib of the 
narrow, elongated pinnules. 
In so far as it is known, the Upper Blairmore flora is decidedly distinct 
from that of the Lower Blairmore. This difference rests not only on the 
number and variety of dicotyledonous leaves in the former, but also on 
the fact that none of the ferns, eycadophytes, or conifers of the two horizons 
is certainly identical. 
The age indicated by the plants of the Upper Blairmore is not especi- 
ally clear, because of the somewhat conflicting ranges of some of the forms 
and the uncertainty of their identification both at this horizon and from 
outside localities from which they have been described. Five of the 
Upper Blairmore plants are recorded from the Lower Cretaceous, but in 
all of these cases the species either range into the early Upper Cretaceous, 
or are probably wrongly identified, or present no very characteristic specific 
features. Five occur in the Cheyenne sandstone flora of southern Kansas 
recently monographed by the present writer 1 , and although the known 
flora of the Cheyenne sandstone shows a single ecological dry soil assemb- 
lage such as would not be expected to occur in Alberta, I am disposed to 
consider the Upper Blairmore flora as of approximately the same age as 
that of the Cheyenne sandstone. The latter belongs to the Upper or 
Washita division of the Comanche series and has, until recently, been 
considered to represent the late Lower Cretaceous by American palseozo- 
ologists, although the writer has called attention to its Upper Cretaceous 
age upon several occasions. 
Five of the Upper Blairmore plants are recorded from the Dakota 
sandstone. With only a single exception these are all either doubtfully 
determined, or there is doubt whether the type came from the true Dakota 
sandstone or from the underlying Mentor beds of Kansas, which latter are 
the same age as the Cheyenne sandstone. Moreover, these four species 
are not recorded from horizons in the United States synchronous with the 
true Dakota, which is the case with a large proportion of the true Dakota 
species. Nor are any of the more characteristic Dakota sandstone plants 
present in the Upper Blairmore. The exception mentioned above is 
Pseudocycas unjiga whose occurrence in the Dunvegan sandstone stamps 
it as an undoubted member of the true Dakota flora. 
The following list shows the range of the Upper Blairmore plants, and 
it will be noted that the evidence regarding age is more or less confusing 
and conflicting, which is just what might be expected where there is no 
time break between the sediments of the late Lower and the early Upper 
* Berry, E. W.: U.S. Geol. Surv., Prof. Paper 129, pp. 199-225, Pis. 46-61 (1922). 
