HURONIAN FORMATIONS, TIMISEAMING REGION. 
11 
stone. In fact fragments of the lower series are nowhere abund- 
ant in it and are often angular or imperfectly rounded. 
The basal conglomerate of the upper sedimentary series 
grades upward into 500-600 feet of white quartzite and this in 
turn into a slate conglomerate complex including the same 
association of deposits as in Bruce area, except that the order 
and relative thicknesses of these are notably different, as may 
be seen by comparing the columns in Figure 3. The lowermost 
member of the slate conglomerate is a massive boulder con- 
glomerate consisting of boulders and pebbles of a great variety 
of rocks held together by a greywacke matrix of varying texture. 
This conglomerate is 600 feet thick and grades down into the 
underlying quartzite in a thickness of 20 feet. The Blind 
River section of the slate conglomerate also includes 40 feet 
of impure limestone interbedded with thin siliceous layers not 
found in Bruce area. The upper portion, near the great fault, 
is so crumpled and folded that no reliable measurement of its 
thickness could be obtained, but the entire complex is probably 
as thick as that found in Bruce area. 
Whiskey Lake Area, 
The most complete and least complicated sequence of for- 
mations obtained in this area occurs in township 144 and vicinity, 
being especially well exposed on the shores of Big lake. The 
country north of Big lake consists of granite and gneiss, and a 
few small areas of highly fissile slate intimately associated with 
the granite and apparently older than it. On Whiskey lake, 
4 miles to the east, the granite is also intrusive into igneous 
greenstones and green schists. Hence the pre-Huronian complex 
comprises sedimentary rocks, an igneous schistose complex, 
and a younger batholithic granite intrusive. Two Huronian 
sedimentary series are exposed on Big lake, forming a gentle 
monocline that rests directly upon the granite-gneiss and dips 
from 15 degrees to 50 degrees southward. These sediments are 
intruded by dykes and larger bodies of diabase like that found 
in the areas already described. 
