i ^'r, The Aniericrni Geologiai. F-pbrnarv, isp:; 
twenty miles inland we find the bedding of the Huronian quartzites, 
&e. (which stands almost on edge), abutting upon the Laurentian, at 
nearly a right angle. The latter liere consists of very regularly 
stratified gneiss running north-east and dipping uniformly soiitli- 
eastward at an average angle of 60 . 
Near lake Huron a belt of red hornblende-granite intervenes be- 
tween the gneiss and the quartzite series, but in one part this is 
separated from the former by a belt of somewhat altered quartzite, 
so that tliis granite may be included within the Huronian rather than 
the Laurentian. 
There was clear evidence of a great dislocation between the (piartz- 
ites on the one hand and the granite and gneiss on the other. The 
actual contact of the two sets of rocks is plainly seen at many ])laces 
along the line. It is accon)])anied by nuich breaking up of the rocks 
on either side, forming not only coarse and tine breccias, but also se])- 
arating masses of the quartzite hundreds of yards in length, from 
the main body. The latter phenomenon was e.vplained as having 
been due to thrusts between secondary planes of fracture and the 
])rimary one. The Huronian rocks were altered for a few hundred 
yards inward from the line of dislocation, grey wackes being converted 
into gneiss, silicious flags into mica-schist, etc. 
Continuing north-eastward, upon the boundary of the two systems, 
there was evidence of faulting along their contact where it follows the 
AVahnapita- river, at the intersection of the Canadian Pacific railwaj', 
as described in the report by the author, on the geology of the Sud- 
bury district (1891). Towards lake Temiscaming, on the Ottawa, the 
two sets of rocks might be conformable. A case of unconformity oc- 
curring on the Missinaibi river, nortli-east of lake Superior, had V)een 
mentioned in the author's Geological Survey report for 1875. 
Some of the elongated greenstone masses of the lake Huron 
region might have been originally outflows upon an uneven but ap- 
proximately horizontal surface. After having been deeply covered 
by other deposits, the whole series had now been tilted almost on 
edge and the greenstones appeared as if they might hiive had an intru- 
sive origin. 
The Huronian granites of the region described were, in some cases, 
at least, altered stratified rocks. Interru]jted bands of (luartzite and 
schist had been observed incorjiorated in the rather coarsely crystal- 
line homogeneous granite. 
On the other liand, the Huronian rocks of the north shore of the 
lake include almost imaltered strata. In a brown sandstone of the 
series associated with mudstones and dolomites on Aird island, the 
author had discovered forms resembling fucoids or the trails of anne- 
lids, and he e.xhibited a ripple-marked slab on whicii these were very 
well seen. 
In the region described, the dependence of the present surface con- 
tours and other geographical features upon the nature of the funda- 
mental rocks and tlie conditions atl'ecting them was very marked. 
One of the most striking exam[)les was to be seen along the great 
fault which had been descriV)ed. The Huronian country on the north- 
west was elevated and mountainous up to the very contact, and it 
overlooked the Laurentian area, which stretched far ott' to the east- 
ward as a comi)aratively level ])lain. 
On Thursday evening the visiting members of the tfeologieal 
Society were entertained to a l)anquet by the Logan club, which 
consists of the scientific start' of the Canadian Geological Sur- 
vey. Among those present were lord Stanley', governor-general 
of Canada, Sir John Thompson, premier of the dominion, T. M. 
