MINERALS AND GEOLOGY OF CANADA. 207 
township (Peel Co.) ; and sweeps from these points to the north and 
north-west, coming out on Georgian Bay in the townships of Colling- 
wood, St. Vincent, Keppel, and Albemarle. Lonely Island and the 
other islands between Cabot’s Head and the Manitoulins are also 
composed of Hudson River strata; and the formation runs through 
the Manitoulin group, and across Drummond Island—reappearing in 
Sulphur Island, and on the north shore of St. Joseph’s Island, from 
whence it passes into Michigan. Instructive exposures, from which 
many fossils may be collected, occur more particularly on the banks 
of the Don, Humber, Mimico, Htobikoke, and Credit, along the 
southern outcrop of the formation. Also at Point Boucher in Notta- 
wasaga Bay; Point Rich, Point William, Cape Crocker, and Point 
Montresor, further west along the coast. On Lonely and Rabbit 
islands, at Cape Smyth, and various points along the north shore of 
the great Manitoulin; and on the northern headlands of Cockburn 
Island. 
In Eastern Canada, the formation is exposed more particularly on 
the banks of the Richelieu, about Chambly, and on the Riviére des 
Hurons and the Yamaska, these rivers probably running, according 
to Sir William Logan, on three parallel anticlinals. Also on the 
south shore of the St. Lawrence, between St. Nicholas and the 
Riviere du Chéne ; around Quebec, and largely at the Montmorenci 
Falls; and on the north side of the Island of Orleans. It has been 
discovered also on Snake Island, Lake St. John; and likewise on 
the coast of Gaspé, between Cape Rosier and the River Marsouin, 
and more especially about the Magdalen River. Finally, the Hudson 
River Formation occurs in foree along the north coast of the Island 
of Anticosti, where it is principally composed, however, of argillace- 
ous limestone. The remarkable fossil bodies named Beatricea by 
Mr. Billings, were discovered at this locality, and also at Lake St. 
John, some years ago, by Mr. Richardson of the Geological Survey. 
These fossils resemble petrified fragments of the trunks and limbs of 
large trees. Their true nature is still doubtful, but they are general- 
' ly regarded as belonging to an extinct genus of corals. 
The Hudson River formation is not iich in economic materials, but 
it yields in places some tolerably good flagging stones. At the “ Blue 
Mountain,” in Collingwood township, whetstones of fair quality are 
also obtained from this formation; and certain strata near Quebec 
furnish a good hydraulic cement. A very strong cement has likewise’ 
