99 
changes. At first, of the older Mesozoic type, they consist chiefly of ferns, 
cycadophytes, and conifers. Later, in lower Blairmore time, very rare 
angiosperms appear, and in upper Blairmore time, angiosperms become 
more common and the flora begins to take on a modern aspect. 
CORRELATION 
It is fortunate that the Corbula munda fauna, the most abundant and 
longest ranging of the local Fernie faunas, contains ammonoids, for they 
make a correlation possible. When this fauna was first studied its resem- 
blance to the Sundance fauna was noted, but it soon became apparent 
that there were no species in common and that this was a Jurassic fauna 
hitherto unknown in the North American interior. The following pelecypod 
species show various degrees of resemblance to Sundance species, but are 
nevertheless distinct : 
C. munda fauna 
Sundance fauna 
Gervillia ferrieri 
G. montanaensis Meek 
Oxytorha blairmormsis 
0, wyomingensis Stanton 
Pseudomonotis femiensis 
P. eurta (Hall) 
Gryphaea impressimarginata (sulcated forms) 
G. calceola var. nebrascensis M. and H. 
Camptonectes cf. bettistriatus (Meek) 
C. bellistriatus (Meek) 
Lima albertensis 
L. cinnabarensis Stanton 
Modiolus femiensis 
M. subimbricata (Meek) 
Pleuromya obtusiprorata 
P. concentrica Whitfield and Hovey 
Anatina cf. punctata Stanton 
Anatina punctata Stanton 
Thrada canadensis 
T. sublaeiris M, and H. 
Cyprina cf. iddingsi Stanton 
C. iddingsi Stanton 
Although the pelecypods show that this is a different fauna from that of 
the Sundance they do not indicate whether earlier or later. The study of 
the ammonoids, however, by Ruckman * 1 shows that this is an earlier fauna. 
None of the Fernie ammonoid genera from Blairmore occurs in the European 
sections, but Buckman 2 notes the resemblance of one genus to Catacephalites, 
the date of which is the Catacephalites hemera of the Proplanulitan age. 
The C. munda fauna, therefore, is of about Proplanulitan age in Buckman’s 
chronology or Callovian or early Upper Jurassic. The Sundance Cardio- 
ceras fauna is considerably younger, being of Argovian 3 age or middle 
Upper Jurassic. Likewise the Cardioceras or Argovian faunas of Big 
creek, Chilcotin river, B.C. 4 5 , and the Cardioceras fauna in the Fernie 
formation near Fernie, B.C. 4 , are younger. The Quenstedtoceras fauna of 
the Ellis formation of Montana is also younger, being of Divesian age 6 , 
but is older than the Sundance and other Cardioceras faunas. The 
Seymourites mcevoyi fauna of the Fernie of Kananaslds river 6 and the 
1 Buckman, S. S.: Jurassic Ammonoidea; this volume. 
1 Buckman, S. S.: Jurassic Ammonoidea, this volume. 
* Reeside, j R., jun.: U.S. Geol. Surv., Prof. PapT 118, pp. 10, 11 (1919). 
4 Reeside, J. R,, ,iun.: U.S. Geol. Surv., Prof. Pap. 118, pp. 10, 11 (1919). 
5 Reeside, J. B., jun.: TJ.S. Geol. Surv., Prof. Pap. 118, pp. 10, 11 (1919). 
• McLearn, F. H.: Trans. Roy. Soc., Canada, 3rd ser., vol. 21, sec. IV, pp. 63-64 (1927). 
