904. A POPULAR EXPOSITION OF THE 
Wy 
Fig. 201.—Asaphus Canadensis (Chapman). 
In addition to the above forms, several species of brachiopods, 
which occur also in both the Trenton and Hudson River Groups, are 
also frequently met with. The most abundant of these comprise: 
Orthis testudinaria (fig. 182), Strophomena alternata (fig. 186), 
Rhynconella increbescens (fig. 187), and Leptena sericea (fig. 204). 
In Western Canada, the Utica formation (No. 7 on the map, fig. 
249) occupies a small area in the immediate vicinity of Ottawa city, 
another in the township of Cumberland, and a third in Clarence and 
Plantagenet (Counties of Russell and Prescott); but it is far more 
extensively developed in the geological region on the western side of 
the gneissoid belt which crosses the St. Lawrence at the Thousand 
Isles. In this region, it forms the shore of Lake Ontario from a 
little west of Cobourg to the township of Pickering, and sweeps from 
these points to the north-west, coming out at Georgian Bay in the 
townships of Nottawasaga and Collingwood. Within the interven- 
ing space, however, it is entirely obscured by a thick capping of Drift 
deposits. It appears also in a narrow band in the Manitoulin 
Islands, more especially in the neighbourhood of Cape Smyth; and 
is obscurely seen on St. Joseph’s Island. The best exposures in 
Western Canada, occur near Ottawa City; on and adjacent to the 
shore of Lake Ontario, in the township of Whitby ; in Nottawasaga 
Bay under the “ Blue Mountains,” a few miles west of Collingwood 
Harbour ; and at Cape Smyth and some of the neighbouring bays 
and small islands of the Manitoulin group. 
The formation in Eastern Canada, presents in many localities a 
