2 
MUSEUM BULLETIN NO, 4. 
perhaps deserving of record at this time, though the formation 
would repay a more detailed and careful study. 
In the preparation of this paper the writer was helped by 
advice and criticism from the late W. W. Leach, and from Dr. 
C. H. Warren and Dr. H. W. Shimer. The work in connexion 
with this paper was prepared in the geological laboratories of 
the Massachusetts Institute of Technology. 
HISTORICAL. 
In 1886 G. M. Dawson published some brief descriptions 
of these volcanics, and listed some localities where he had ob- 
served them. 1 He states (p. 69 B) that they were first observed 
in 1881 (by himself ?) in the Crowsnest pass. In 1902 W. W. 
Leach of the Geological Survey of Canada mapped and made 
a report on the Blairmore-F rank coal fields. 2 He makes note 
of the usefulness of the volcanics as a horizon marker. Specimens 
of the tuffs and agglomerates collected by Mr. Leach have 
been examined petrographically by C. W. Knight 3 and further 
reference will be made to his work. Leach, in his detailed 
examination, in 1912, of the Blairmore map-area, gives measure- 
ments of the volcanics. 4 
So far as is known to the present writer, the references 
noted above form the only literature in regard to these rocks 
published to date. 
LOCATION. 
The district underlain by the Crowsnest volcanics comprises 
a portion of the eastern Rocky mountains and their foothills, 
in southwest Alberta. The southernmost outcrops are in about 
latitude 49°25' north, and they extend nearly due north some 
forty-eight miles to about latitude 50°05' north. The southern 
boundary of the formation is not far south of the South Branch 
ffDawson, G. M Geol. and Nat. Hist. Survey of Canada, Part B, Ann. Rept. , 
1885, pp. 57B, 69B, 88 B. 
2 Leach, W. W., Ann. Rept., Geol. Survey, Canada, vol. XV, p. 171 A. 
^Knight, C. W.. Canadian Record of Science, Montreal, vol. 9, No. 5, 1905 
pp. 265-278. 
4 Leach, W. W., Summary Rept. Geol. Survey, Canada, 1911, p. 197. 
