98 
the Allison formation; the finding of a sparse mixed fauna and a small 
flora 315 to 320 feet up in the Allison and a poorly preserved but abundant 
freshwater fauna in the upper part of the Allison. 
The faunas and floras are arranged in the following fable in their 
natural order and their positions in the several formations are indicated: 
System 
Fauna 
Flora 
Formations 
Cretaceous 
Montanan 
Physa-Sphaerium 
and 
Unio dame 
(freshwater) 
Allison 
Zamites albertensis 
Corbula cf. perundata 
(brackish) 
I. cf. lundbreckensia 
(marine) 
I. lundbreckensia 
(marine) 
Colorado 
Coloradoan 
S. ventricosus 
(marine) 
Prionotropis 
(marine) 
I. labiatus? 
(marine) 
Crowsnest 
Upper Blairmore, ferns, 
cycadophytes, conifers, 
angiosperms 
Blairmore 
U nio hamili-douglassi-napii 
(freshwater) 
Lower Blairmore, cycado- 
phytes, ferns, conifers, 
very rare angiosperms 
Cycadophytes, ferns, 
conifers 
Kootenay 
? 
“Passage beds” 
fauna 
“Passage beds” 
Jurassic 
Green bed 
(marine) 
C. munda 
(marine) 
C. mcconnelli 
(marine) 
Fernie 
This is an interesting section extending as it does from Jurassic to well 
up in the Upper Cretaceous. Only marine faunas appear in Fernie time. 
Only floras and freshwater faunas appear in Kootenay and Blairmore time. 
Marine faunas do not reappear until Coloradoan time, but continue into 
early Montanan time, i.e. into basal Allison time. They are then sup- 
planted, however, first by a mixed or brackish fauna, by a flora, and finally 
by a long-ranging freshwater fauna. The floras undergo important 
