95 
However, neither S. warreni nor any other Scaphites of the Prionotropis 
fauna is present in the collections from this horizon, and it is probable that 
the S. ventricosus fauna or some early development of it ranges even as 
low as this in the exposed section. At BO feet the single species found 
throws no light in the downward range of the S. ventricosus fauna. In its 
upward range this fauna goes to the very top of the exposed section, i.e., 
to 1,650 feet, S. ventricosus itself extending that high. 
The local ranges of several important species are worthy of note. 
Just what significance they have and whether the S. ventricosus zone 
admits of subdivision are at present unknown. Baculites cf. asper has a 
long range from 590 to 1,650 feet. The B. cf. anceps has a very much 
shorter range, having been found only at 1,650 feet. Scaphites ventricosus 
and S . ventricosus var. saxitonianus both have long ranges, the former 
from 840 to 1,650 and the latter from 840 to 1,500 feet. S. vermiformis 
on the other hand was found only at the top of the section, at 1,650 feet. 
Inoceramus exogyroides was found only at 840 feet, whereas I.coulthardi 
was found from 1,400 to 1,650 feet. 
INOCERAMUS LUNDBRECKENSIS FAUNA 
The estimated 570 feet of concealed strata at the top of the western 
Crowsnest River section of the Colorado shale may be accounted for in 
part by strata at a locality just east of the Rlairmore map-area, on the 
north bank of Crowsnest river, about 2 miles west of Lundbreck. There 
the basal sandstones of the Belly River, a formation which in its lower 
part at least corresponds roughly with the lower part of the Allison forma- 
tion of the west, are followed below by about 80 feet of banded sandstone 
and shale and by several hundred feet of shale. In the lower part of this 
shale the following were collected: 
Inoceramus lundbreckensis McLeam 
Baculites cf. asper (Morton) 
/. lundbreckensis is very similar to a species in the overlying Lower Allison 
beds; it is, therefore, probable that the I. lundbreckensis fauna is a post-$. 
ventricosus one near in age to that of the I. cf. lundbreckensis fauna of the 
lower Allison. 
INOCERAMUS CF. LUNDBRECKENSIS FAUNA 
The basal part of the Allison formation is well exposed on Gulch 
creek (Gulch creek is the first creek east of Matheson creek) and, at levels 
of 100 and 185 feet above the base of the exposed section, contains a 
sparse marine fauna which is listed in the following table: 
Fossil lot No. 
CA2 
CA3 
Feet above base of exposed section of Allison 
100 
185 
Legumen napii MoLearn 
Ostrea saxitoniana MeL«arn 
Pteria sp 
Pteria ? sp 
Inoceramus cf. lundbreckensis Mc.Learn , , 
Shark and other teeth 
