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buchianus abietinus, the abundance of coniferophytes, and the presence of 
dicotyledons. The last are sparingly represented, however, by a single 
species, which significantly represents one of the more specialized orders — 
the Sapindales. It may be concluded, therefore, that the less specialized 
orders were already in existence somewhere, if not in this region, during 
Lower Blairmore time. 
As befits its chronologic position the Lower Blairmore flora is what 
might be termed “mixed.” At least it suggests such a statement which 
may, of course, be due to the imperfection of the record or the lack of 
exhaustive exploration. Thus of the plants found in the Kootenay of 
the Crowsnest Pass region ten are not found in the Lower Blairmore, and 
of those found at the latter horizon fifteen are not found in the Kootenay 
of this region, although only ten are unknown from the complete Kootenay 
flora, and one of these ten occurs in the Bull Head Mountain sandstone 
which may be of Kootenay age. Although the Lower Blairmore flora is 
more nearly of the same age as the Patapsco flora of the Atlantic Coastal 
Plain than of those of the older formations of the Potomac Group it con- 
tains three more species common to the much older Patuxent flora than it 
does species common to the Patapsco. 
The most obvious distinction between the Kootenay and the Lower 
Blairmore floras is the sparing representation of dicotyledons in the latter 
and their absence in the former, the particular species, Sapindopsis hrevi - 
folia , being common to the late Lower and the earliest Upper Cretaceous. 
Dicotyledons in any abundance are usually considered to indicate an 
Albian or later age, although these types are present in considerable speciali- 
zation in the preceding Aptian stage. 
Of the Lower Blairmore plants unknown in the Kootenay seven are 
new species or are not specifically determined, leaving only four species, 
namely, Sagenopteris mantelli, Nilsonia densinerve, Torreya dicksoniana , 
and Sapindopsis brevifolia with an outside distribution and not known from 
the Kootenay. Of these the first occurs in the Knoxville of the Pacific 
Coast region and the European Lower Cretaceous; the second occurs in 
the Patuxent and Arundel formations of the Atlantic Coastal Plain; the 
third occurs in the Bull Head Mountain sandstone (of Kootenay age?) and 
in the Kome beds of western Greenland ; and the fourth occurs in the Patapsco 
formation (Albian) and in the Cheyenne sandstone (Cenomanian) of 
southern Kansas. 
Considering the Lower Blairmore flora as a whole it contains seventeen 
known Kootenay species, all of which are distinctly old types; five species 
common to the Bull Head Mountain sandstone; twelve common to the 
Knoxville of the Pacific Coast region; five common to the Lakota, and 
four common to the Fuson formation of the Black Hills of eastern Wyoming; 
twelve common to the Patuxent, eight common to the Arundel, and nine 
common to the Patapsco formation of the Atlantic Coastal Plain ; thirteen 
probably common to the Kome beds of western Greenland; and nine 
probably common to the Lower Cretaceous of Europe. 
The Lower Blairmore flora does not contain a single Upper Cretaceous 
type, and only one of its members, namely, Sapindopsis brevifolia , has ever 
been recorded from the Upper Cretaceous, and this species originated in 
