5 
GENERAL CLASSIFICATION OF THE ROCK SERIES 
The rock series which enter into the particular problem under dis- 
cussion were studied in Canada first along the International Boundary 
line in 1902, although the problem had been receiving attention in the 
United States since 1883. A comprehensive review of the whole subject 
is given by Daly 1 * * . The following table represents the two series of rocks 
which directly concern the particular problem in southeastern British 
Columbia. 
Galton Series* Purcell Series 3 
(Galton range) 
Feet 
(Purcell range) 
Feet 
Roosville 
1,000 
Phillips 
Gateway.. 
500 
2,500 
300- 
Gateway 
1,000 
Purcell lava 
Purcell lava 
Siyeh 
4,000 
Siyeh 
Wigwam 
Kitchener 
4,500 
MacDonaJd 
2,350 
Creston 
8,000- 
Hefty 
775 
Aldridge 
Altyn 
Base unexposed. 
Base unexposed. 
Daly holds that in the Purcell series the Aldridge formation only 
belongs to the Beltian, that the Creston and the lower part of the Kitchener 
are to be grouped in the Lower Cambrian, the upper part of the Kitchener 
is Middle Cambrian, and that in the Galton series the Altyn only belongs 
to the Beltian. In both series Daly considers the Beltian and the Lower 
Cambrian to be conformable. 4 
In 1913 the writer discovered a section near Elko, B.C., where fossilifer- 
ous Cambrian rocks are in contact with the Galton series. On the basis of 
the field facts at Elko the whole of the Galton and the Purcell series were 
assigned to the Precambrian. 5 The fossils collected in the Burton forma- 
tion, which rests with disconformable relationships on the Roosville forma- 
tion of the Galton series, were classified as lowest Middle Cambrian by 
Burling. 6 In 1916 Drysdale on a purely lithological correlation placed the 
part of the Purcell series above the Kitchener formation in the Lower 
Cambrian, thus restricting the Creston and Aldridge formation only to 
the Beltian. 7 The definition of the Burton formation as lowest Middle 
Cambrian by Burling rests on his contention that the Albertella fauna is 
restricted to the Middle Cambrian. 8 Walcott previously in 1908 placed 
the Albertella fauna in the Lower Cambrian. 9 In 1921 Walcott placed the 
upper 60 feet of the Burton in the Middle Cambrian and the remainder in 
the Lower Cambrian. 10 
1 Daly, R. A., Geol. Surv., Can., Mem. 38, 1912, p. 179. 
* Daly, R. A., Geol. Surv., Can., Mem. 38, 1912, p. 97. 
Schofield, S. J., Geol. Surv., Can., Mua. Bull. No. 2, 1914, p. 3. 
8 Daly, R. A., Geol. Surv., Can., Mem. 38, 1912, p. 119. 
Schofield, 8. J., Geol. Surv., Can., Mus. Bull. No. 2, 1914, p. 7. 
4 Daly, R. A., Geol. Surv., Can., Mem. 63, 1915, p. 94. 
6 Schofield, S. J., Geol. Surv., Can., Mus. Bull. No. 2, 1914. 
* Burling, L. D., Geol. Surv., Can., Mus. Bull. No. 2, 1914, p. 125. 
7 Drysdale, C. W., Geol. Surv., Can., Sum. Rept., 1916, p. 61. 
* Burling, L. D., Geol. Surv., Can., Mus. Bull. No. 2, p. i25. 
* Walcott, C. D., Smithsonian Misc. Coll., vol. 55, 1908, p. 202. 
10 Personal communication 1921. 
