100 
Seymourites ( Yakounites ) fauna of the upper part of the Yakoun formation 
of Skidegate inlet, B.C. 1 , are of similar age to the C. munda fauna, but 
probably not of the same hemera. The early Middle Jurassic faunas, the 
Defonticeras and Zemistephanus faunas of the Lower Yakoun of Skidegate 
inlet, the Stemmatoceras-Saxitoniceras fauna of the Fernie on Sheep river, 
Alberta, and the fauna with Sonninines in the Fernie at Minnewanka lake 2 
are all much earlier than the C. munda fauna. 
As the Chlamys mcconnelli fauna contains only new species and no 
ammonoids, its correlation is difficult. Of the eight species six are entirely 
unlike any in the succeeding Corbula munda fauna. One, Lima stantoni , 
resembles a poor and indeterminate specimen in the C. munda fauna on 
Castle river and some of the specimens listed under Camptonectes sp. 
resemble some in the higher fauna, but no mature specimens are in the 
later fauna and none of the large Camptonectes specimens in the C. mcconnelli 
fauna have the surface markings preserved. Therefore, a close resemblance 
of the two faunas cannot be proved. On the other hand the unlikeness of 
these two faunas does not necessarily prove difference of age, for there is 
some evidence that they lived under somewhat different conditions of 
habitat; the grain of sand is much coarser in the rock enclosing the C. 
mcconnelli or Lille fauna; the Gryphaea spat were able to settle in abund- 
ance on the Lille or C. mcconnelli bottom, but some factor of the environ- 
ment inhibited their growth beyond about 10 mm., whereas on the C. 
munda bottom they were able to grow to mature size; on the Lille bottom 
Camptonectes grew to large size, whereas on the C. munda bottom it 
attained only a small size. 
The fauna of the Green beds is probably Jurassic, but no exact corre- 
lation can be made until more is known of the diagnostic value of our 
belemnoids. It may be of the 0. munda fauna and different in composition 
from that in the lower beds because of the difference of facies or it may be 
of a later Jurassic fauna. 
Thus a Callovian, the C. munda , fauna ranges through the greater 
part of the formation in this region, but the faunas occurring both below 
and above it cannot now be dated and, consequently, the range of time 
represented by the entire Fernie section in this region cannot now be deter- 
mined. This makes it very difficult, and at present impossible, to correlate 
the entire Fernie formation of this region with the Fernie of other parts of 
western Alberta and eastern British Columbia. The problem is compli- 
cated by the presence of unlike faunas in different localities 3 and by the 
lack of knowledge of the range of these faunas within the Fernie sections. 
The question arises 4 , do the faunas of the several localities range through 
all of the Fernie strata or only through parts of them? In other words 
are all of the strata of each locality of the age of the single faunas found 
there and, therefore, the strata of the several localities are of short time 
range and of unlike ages; or are the strata of the various localities of com- 
paratively long time range and all of approximately the same age, i.e., 
about lower Middle to middle Upper Jurassic, and it so happens that 
i McLearn, F, H.: Geol, Surv. , Canada, Bull. 49, p. 19 (1928). 
1 McLearn, F. H : Geol. Surv\, Canada, Sum. Rapt. 1922, pt. B, p. 6 (1923). 
This fauna is not yet dated, but is very late Lower Jurassic or early Middle Jurassic. 
* McLearn, F. H.: Geol. Surv., Canada, Sum. Rept. 1922, pt. B, p. 6 (1623). 
* McLearn, F. H,: Trans. Roy. Soc., Canada, 3rd ser., vol. 21. sec. IV, pp. 70-71 (1927). 
