408 Canadian Record of Science. 
character and attitude. The lowest beds are conglomerates 
of very coarse character, and attain a thickness of not less 
than 1000 feet, with a nearly uniform south-easterly dip of 
50°. The pebbles in the conglomerates include many of 
limestone, and have apparently been derived from the 
disintegration of the slates and limestones of the Quebec 
group, but are not at present known to contain any fossils. 
Above the conglomerates is a considerable breadth of slates, 
also usually inclined southwards at high angles and includ- 
ing some beds of limestone, above which we finally have a 
great body of sandstone rock, peculiar, in addition to its 
hard and massive character, in being often of greenish or 
purplish color, with veins and blotches of epidote and 
bands of purple jasper. These rocks which form upon the 
lake the promontory of Point aux Trembles, and thence 
extend up the Tuladi river to Squatook Peak, which is 
composed of them, have been in earlier publications sup- 
posed to be younger than those of Mount Wissick and to be 
possibly Devonian. But collections of fossils recently 
made from both the slates and sandstones, and examined 
by Mr. Ami of the Geological Survey, would seem to show 
that they are really the older of the two, representing pro- 
bably the lower part of the Niagara formation, and per- 
haps the Medina or Clinton group. From this it would 
also follow that we have here a great physical break in the 
Silurian system, its upper members being not only uncon- 
formable to the lower, -but spreading beyond the limits of 
the latter, and thus made to rest directly upon the rocks of 
the inferior Quebec group. 
The third and last group of rocks found at Temiscouata 
Lake consists of fine grained slates, with some sandstones 
of grey and dark grey colors, all of which are more or less 
calcareous, and are further noticeable for their repeated 
and complicated corrugations and the general presence of 
a very strong slaty cleavage. The direct contact of tlie 
slates with the sandstones of Point aux Trembles has not 
been observed, but from their general position in relation 
to the latter and from such fossils as have elsewhere been 
