15 
(5) The Lower Cambrian rocks are marine, whereas the Precambrian 
rocks are generally considered to be of continental origin. Marine fossils 
are the rule in the Cambrian; mud-cracks, ripple-marks, and casts of salt 
crystals are present in great abundance in the Precambrian formations. 
(6) The presence of the unconformity between the Lower Cambrian 
and the Precambrian places definitely the Purcell series and its equivalents 
in the Beltian or Precambrian. 
(7) The following table represents a preliminary correlation of the 
sections at Cranbrook, Elko, and Ram creek. 
Cranbrook section 
Thick- 
ness 
Elko section 
Thick- 
ness 
Ram Creek section 
Thick- 
ness 
Feet 
Feet 
Feet 
Devonian 
Jefferson t 
limestone 
500+ 
Disconformity 
Middle 
Cambrian 
Elko formation 
00 
Elko formation 
1,000+ 
Burton formation 
(upper part) 
60 
Burton formation 
475 
Lower 
Cambrian 
Eager shales 
300 
Burton formation 
(lower part) 
17 
Cranbrook 
conglomerates 
600 
Cranbrook 
conglomerates 
1 } 
Cranbrook 
conglomerates 
1,220 
Unconformity 
Disconformity 
or Unconformity 
Disconformity 
or Unconformity 
Roosville 
formation 
1,000 
Roosville formation 
1,000 
Phillips formation 
500 
Phillips formation 
400 
Gateway 
formation 
2,000+ 
Gateway formation 
1,500 
Beltian 
(Pre- 
cambrian) 
Siyeh formation 
Purcell lava 
300 
-100 
Base unexposed 
Siyeh formation 
Purcell lava 
500 
50 
Siyeh formation 
4,000 
Siyeh formation 
4,000 
Kitchener 
formation 
Creston formation 
4,500 
5,000 
Kitchener formation 
Creston formation 
4,500 
5,000 
Aldridge 
formation 
Base unexposed 
8,000 
Aldridge formation 
Base unexposed 
5,000 ■ 
