202 ROYAL SOCIETY OF CANADA 
son River respectively), consist of cream-coloured limestones and dolo- 
mites, with red calcareous marls and shales abounding in fossil remains. 
In eastern Manitoba Mr. Dowling describes the following succession in 
descending order :— 
V. Hudson River shales. 
IV. Upper Mottled limestones. 
III. Cat Head limestones. 
Il. Lower Mottled limestones. 
I. Winnipeg sandstones. 
There is no doubt that a belt of Ordovician rocks underlies the 
Silurian, Devonian and Cretaceous system along the eastern prairie 
plateau, both northward, westward and southward. Dr. J. F. Whiteaves 
has described a very interesting series of Galena-T'renton and Black River 
fossils from Lake Winnipeg and its vicinity. 
The Cordilleran Region.—In British Columbia rocks of Ordovician 
age appear in the Rocky mountains proper, at Devil’s Head lake, near 
Banff. Along the Kicking Horse river at Glen Ogle, graptolitic slates 
and limestones with shales carrying an Ordovician fauna have been 
described by Mr. McConnell. The graptolitic fauna recognized by Prof. 
C. Lapworth, of Birmingham, is here classed as constituting the Wapta 
formation, and belonging to the upper half of the Ordovician system. : 
In the Selkirk range, no outcrop of rocks definitely referable to this 
age have as yet been detected, but some of the black graphitic and 
bituminous slates and limestones may possibly belong to this system. 
In the Yale district, west of Lansdowne, at Adam’s lake, Dr. Dawson 
and Mr. McEvoy have recorded, and refer, certain crystalline limestones 
to this horizon, and on the Dease river, in the Yukon territory, grapto- 
litic slates similar to those of the Wapta formation at the Glen Ogle 
quarries on the Kicking Horse river have been described by Mr. 
McConnell, and the graptolites which those slates carry were studied 
by Prof. Chas. Lapworth, of Mason Science College, Birmingham, and 
reported upon to the Canadian Geological Survey. 
THE SILURIAN SYSTEM. 
The Acadian Region.—The Silurian system as understood in Canada, 
and restricted to the upper division of Sir Roderick Murchison’s Silurian 
is extensively developed both in Nova Scotia and New Brunswick. At 
Arisaig, in Antigonish Co., Nova Scotia, several thousand feet of more 
or less disturbed and inclined strata, including an almost regular 
succession of different members of this system, made up of sandstones, 
slates, iron ores, and black graptolitic slates and limestones, with mud- 
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