97 
, UPPER ALLISON FAUNA 
The upper part of the Allison formation outcrops on Matheson creek, 
with long gaps of concealed strata. Much fossil material is present, but 
it is for the most part too badly crushed or otherwise too poorly preserved 
for identification. The fauna includes TJnio danae Meek and Hayden, 
Sphaerium planum M. and H., and indeterminate species of Goniobasis ? , 
Hydrobial, Planorbis , Viviparus , and Physa. Freshwater life alone is 
present. All trace of marine life is gone. More than one community is 
represented. Thus the clays contain chiefly Physa, SphaeriUm, etc., a 
quiet water, a pond, or quiet stream community. The sandstones contain 
adult, heavy-shelled specimens of Unto which are not commonly associated 
with Physa nor with small, thin-shelled bivalves and probably represent 
aquatic conditions with better water circulation and aeration, i.e., a flowing 
stream or large lake. The fauna, in so far as it admits of identification, is 
listed in the table below; the feet given are measured from the coal seam 
in the tunnel east of Matheson brook: 
Fossil lot No. 
Feet above base of upper Allison 
335 
660 
1,160 
1,185 
1,200 
1,380 
1,430 
1,800 
TJnio danae. M and TX , , , , 
— 
— 
Small Uniol . 
S. planum var. 
Goniobasis ? sp 
Hvdrobia ? sp. 
Planorbis sp .......... 
Viviparus sp. . ... , 
— 
— 
— - 
— 
— 
Tndftt. irftstfvrnnnd s 
In a quarry at the east end of Crowsnest lake a tooth of a carnivorous 
dinosaur and part of a neural spine of an herbivorous dinosaur were collected. 
In addition, the following was found at CC8, 1,725 feet above the 
base of the exposed section : 
Sequoia heterophylla Velen? 
Above the conglomerate an indeterminate fern probably of the Cyatheaceae 
was collected. 
SUMMABY 
At least four Jurassic faunules or faunas and at least seven Cretaceous 
faunas and four floras are present in the Mesozoic terrains of the Blairmore 
and South Fork areas. Important additions to our knowledge of the local 
stratigraphy are : the finding of a Jurassic fauna with numerous pelecypods 
and a few ammonoids, the finding of two distinct floras and a small fauna 
in the Blairmore formation, which record locally the coming of the dicoty- 
ledonous angiosperms, the obtaining of three or possibly four faunas in the 
Colorado shale; the discovery of a sparse marine fauna in the bottom of 
