EARLY CAMBRIAN STRATIGRAPHY. 
125 
dition augurs well for the probable delimitation within the 
Pioche of lithologic and faunal units to which member names 
may be applied, but this is left for the investigator who may 
undertake the critical study of this formation in the light 
of the new interpretation to which it has been subjected. 
THE BURTON FORMATION. 
The Burton formation has been named and described by S. J. 
Schofield 1 , who, together with the writer, measured the following 
section in the slope directly back of the Burton mine about 
2 miles northwest of the town of Elko, British Columbia. 
Section of Burton Formation Near Elko, British Columbia. 
Section. 
Feet. 
Fauna. 
Elko limestone (Pre-Devonian, exact ag 
e unkn 
own). 
Burton formation (early Middle Cambrian.) 
5. Grebnish 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 the base: Micromitra ( Pater - 
ina ), Micromitra ( Iphidella ) pan- 
nula , Oholus sp., Acrothele sp., 
Acrotreta sp., Agraulos sp., Pty- 
choparia sp., Alhertella sp., Olen- 
oides sp., Bathyuriscus sp., and 
Crepicephalus 2 species. 
4. Massive, dirty grey, sandy 
limestone. 
10 
Near top: Micromitra sp., Micro- 
mitra ( Iphidella ) pannula, Agrau- 
los sp., Trilob ite fragments 2 
species. 
Near base: Micromitra ( Iphidella ) 
pannula, Trilobite fragments 2 
species, one suggesting 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 ( Pater - 
ina) sp., Acrotreta sp., Trilobite 
fragments 1 species. 
1. Hematite conglomerate 
unconformity 
1 
Roosville siliceous metargillite (Pre-Cambrian) . 
Geoi. Surv., Can., Mussum Bull. No. 2, 1914, p. 82. 
