7 
Roosville Formation 
The Phillips is overlain conformably by the Roosville, Tvhich is com- 
posed mostly of massive, laminated, green, siliceous metargillites weathering 
greenish grey and rusty brown, and buff coloured sandstone. Mud-cracks 
are abundant at all horizons. The Elk River canyon is carved in the 
horizontal strata of the Roosville formation. Cryptozoon forms occur at 
several horizons near the top of the Roosville. 
Burton Formation 
The Burton formation, called after Burton creek, near Elko, rests 
with no discordance of dip on the Roosville siliceous metargillites, and 
consists in great part of greenish-black calcareous shales with interbedded 
siliceous limestone bands. A detailed section of the Burton formation at 
Elko is as follows: 
Elko formation Feet 
Greenish black shales with limestone interbands 60 
Sandy limestone r 10 
Greenish black shale 4 
Calcareous grit 3 
Burton formation [Hematitic conglomerate 1 
The age of the Burton formation is determined by L. D. Burling 1 as 
lowest Middle Cambrian, on the basis of the fossils listed in the following 
section which is located directly back of the Burton mine about 2 miles 
northwest of Elko, B.C. 
Section 
Feet 
Fauna 
Elko limestone 
5. Greenish black shales with interbedded 
limestones, the limestone being in the 
form of lenses and stringers 1 to 3 inches in 
thickness and more or less continuous but 
making up a very small proportion of the 
strata. 
60 
In interbedded limestones within 5 feet of 
base : Micromitra ( Paterina ), Micromitra 
(. Iphidella ) pannula, Obolus sp., Acrothele 
sp., Acrotreia sp., Agraulos sp., Ptychoparia 
sp., Albertella sp., Olenoides sp., Baihyuriscus 
sp., and Crepicephalus , 2 species. 
4. Massive, dirty grey, sandy limestone 
10 
Near top: Micromitra sp., Micromitra ( Iphi~ 
della ) pannula , Agraulos sp., trilobite frag- 
ments, 2 species. 
Near base: Micromitra (Iphidella) pannula, 
trilobite fragments 2 species, one suggest- 
ing Olenellus. 
3. Green micaceous shale, badly sheared 
4 
One trilobitic fragment. 
2. Rubbly weathering, calcareous grit, with 
annelid-like borings in top layer 
3 
Annelid borings, Micromitra ( Paterina ) sp., 
Acrotreta sp., trilobite fragments of 1 spe- 
cies. 
1. Hematitic conglomerate 
1 
Unconformity 
Roosville siliceous metargillites 
(Precambrian) 
1 Burling, L. D., Geol, Surv., Can., Mus. Bull. No. 2, 1914, p. 125. 
