HURONIAN FORMATIONS, TIMISKAMING REGION. 
19 
It is concluded from the above — ^also shown diagrammatic- 
ally in Figure 3 — ^that the pre-Huronian between the Original 
Huronian and Sudbury districts is unconformably overlain, 
upon a weathered and disintegrated surface, by a sedimentary 
series, the most complete observed section of which consists of : — 
Siliceous greywacke 40 feet 
White feldspathic quartzite (Ser- 
pent quartzite^ 1,100 
Red-weathering, impure limestone 
(Espanola limestone^) 50-75 “ 
Stratified greywacke (Espanola 
gre5rwacke0 350 “ 
Siliceous limestone (Bruce lime- 
stone2) 150 “ 
Conglomerate (Bruce conglomerate^) 50-125 “ 
Faint unconformity 
White feldspathic quartzite, ar- 
kosic or conglomeratic at base 
(Mississagi quartzite* *) 1 , 000-2,000 “ 
2,740-3,840 feet 
Attention was called in the description of Whiskey Lake 
area to a breccia and quartzite dykes in the greywacke and upper 
limestone formations and to a faint unconformity between the 
lower quartzite and the conglomerate above it. It is possible 
that unconformities of some size may be found at these horizons, 
but, so far as already observed, they appear to be inter- and 
intra-formational breaks of little chronological importance. 
The Unconformity Between the Huronian and Pre-Huronian, 
The Huronian sediments in the areas under discussion 
overlie granite-gneiss, metamorphosed sediments, and green 
schists — pre-Huronian rocks quite unlike them in appearance. 
1 New names. 
*N. H. Winchell, Sixteenth Ann. Rep. Geol. and Nat. Hist. Survey of 
Minnesota, pp. 12-40; 145-171. 
