1907-8.] THE GEOLOGY OF THE LAKE WENDIGOKAN REGION. 355 
end it is not more than from 15 to 20 paces wide, it widens out .in the 
widest part to about 160 paces and disappears into the lake on the north 
side. This is the finest outcrop of the formation found in the region, 
and though the best analysis made only gave 36.86 per cent. of iron in the 
form of hematite and thus shows this to be too low in iron to be considered 
of commercial value at the present time, it may some day yield some low 
grade ore. The strike of the land is nearly east and west, and the dip 75 
degrees north so that it dips under the lake and there is a possibility of a 
concentration of ore having occurred beneath the lake, though there is an 
absence of very high ground where the iron range outcrops as there is asa 
rule where the large bodies of ore occur in Canada and the United States. 
Northeast of Watson Lake and extending from claim HF32 through 
HF35 and 39 there is a band of iron range which mixes with schist at both 
ends and appears at intervals in the swamp. It is composed of magnetite 
and jasper bounded on both sides by a green slaty schist. The best 
sample of magnetic oxide from this outcrop analyzed 48.9 per cent. of 
iron, showing that it is high enough in iron to make ore, but the quantity 
of the formation exposed is too small to produce a large amount of ore. 
There is, however, quite a strong magnetic attraction in the swamp which 
runs along the north side of the outcrop, and it is barely possible that 
magnetic survey work might reveal the existence of an extensive mass of 
the formation which is now excluded from view. 
A small outcrop of jasper and magnetite on Watson Lake may repre- 
sent a continuation of the band lying farther northeast. The small masses 
scattered over the region are of jasper and hematite enclosed in slaty 
schist and in most cases with vertical dip. 
THE LOWER HURONIAN CONGLOMERATE. 
The conglomerate appears in nearly every part of the region, but the 
most important outcrop lies north of Lake Corrigan. There a great band 
of it rises as a hill over 200 feet above the lake, and it can be traced by less 
prominent but still larger outcrops away to the east. The other outcrops 
are scattered over almost all the remainder of the region, but they are 
mostly small and represent remnants of the once widespread formation, 
now left in small synclines in the older rocks. The formation has been 
subject to some of the same forces which folded the older rocks and has 
much the same strike as they have. It is also in some places quite schis- 
tose with pebbles in the form of nearly perfect lenses. 
Like the iron formation, the Huronian conglomerate fixes a definite 
