HURONIAN FORMATIONS, TIMISKAMING REGION. 
17 
Rock groups so diversified in appearance and mode of origin 
as the pre-Huronian batholithic granite-gneisses, sedimente, and 
schistose volcanic complexes can be convincingly correlated only 
by tracing them as continuously as possible from place to place. 
This has been done, so far, in only a few instances. The Sudbury 
series (Copper Cliff arkose) is known to extend all the way from 
Wanapitei to Round Lake area. Sediments like those of the 
Sudbury series occur at many places along the Canadian Pacific 
railway between Espanola and Blind River, but until these have 
been more thoroughly studied, the pre-Huronian sedimentary 
formations in these two areas cannot be certainly identified 
with the Sudbury series. 
The granite-gneiss intrusive into the Copper Cliff arkose 
at Wanapitei and Round Lake areas is part of the same bath- 
olithic mass. Also the granite-gneiss near Thessalon has been 
traced continuously into Blind River area and in all probability 
continues to Whiskey Lake area. But the relations of this KU- 
larney granite, as it has been named, to the Wanapitei bath- 
olith remains undetermined. 
The schist complex of Wanapitei area is pre-Sudbury in 
age, but the schists in Whiskey Lake and Bruce areas are only 
known to be pre-Killarney and may be either older or younger 
than the Sudbury series. 
The Lower Huronmn Series. 
On the islets in Lake Huron just east of Thessalon and Bruce 
area, as already described, a white quartzite 1,500 feet thick 
and conglomeratic at its base, lies unconformably upon dis- 
integrated Killarney granite-gneiss. It is the lowermost member 
of a conformable series consisting, above it, of about 60 feet 
of conglomerate, 150 feet of siliceous, banded limestone, and, 
in places, the eroded vestiges of a greywacke. In Blind River 
area, 10 miles to the east, a similar white quartzite 1,500-2,000 
feet thick but only faintly conglomeratic at its base, rests in 
the same manner unconformably upon the same Killarney 
granite. There is also one erosion vestige of a siliceous banded 
limestone above the quartzite and the thin conglomerate which 
