19 
NEW JURASSIC AMMONOIDEA FROM THE FERNIE FORM- 
ATION, ALBERTA 
By F. H. McLearn 
Illustrations 
Plates IV to VIII. Illustrations of fossils 
Page 
39-47 
It has been known for some time that the Fernie formation contains 
faunas of more than one age, 1 Two additional faunas are now recognized 
and can be correlated. 
One is represented by an ammonite collected by James McEvoy in 
1908 on Ribbon creek, a tributary of Kananaskis river, and is presumably 
in the Fernie, for that formation outcrops on Ribbon creek. 2 It is not 
known, however, at what horizon in the formation it occurs. This am- 
monite is described below as Yakounites mcevoyi n. sp. and is interesting, 
for Yakounites is in the upper Yakoun fauna at Skidegate inlet, and the 
fauna including it is to be correlated with the Upper Yakoun. The 
affinities of Yakounites are with Galilaeanus S. Buckman and other 
ammonoid genera of Proplanulitan age in the English Jurassic. Another 
fauna having affinities with those of Proplanulitan age in the English 
Jurassic occurs in the Fernie formation at Blairmore, but it contains 
macrocephalitids, not gowericeratids; it is probably not of. exactly the same 
date. In England, faunas of Proplanulitan age are in the Kellaways clay 
and Kellaways rock. 
The other fauna is of considerably earlier age than the foregoing and 
was found by J. R. Marshall on the headwaters of Sheep creek, Alberta. 
It occurs at the base of the Fernie formation 3 and includes the ammonoids 
Stemmatoceras albertense n. sp., Saxitoniceras allani n. sp., and S. marshalli 
n. sp. In Buckman’s chronology the date of Stemmatoceras is the earlier 
part of the Stepheoceratan age. Faunas of this age are found in the 
Bajocian or Middle Inferior Oolite strata of England. Other faunas of 
approximately this date, including those of both Sonninian and Stepheo- 
ceratan affinities, are present in the lower Yakoun at Skidegate mlet, 
in the middle sedimentary division of the Hazelton group on Hudson Bay 
and Babine mountains, probably in the Fernie at Minnewanka lake, 
and at other localities. 
Acknowledgment is made to Mr. S. S. Buckman, F.G.S., for most 
important and helpful advice. Professor J. A. Allan of the University 
of Alberta, Edmonton, kindly loaned the specimen of Stemmatoceras 
albertense . 
1 McLearn, F. H.: Geol. Surv., Canada, Sum. Kept. 1922, pt. B, p. 6 (1923). 
1 Marshall, J. R.: Personal communication. 
* Marshall, J. R.: Personal communication. 
