GEOLOGY OF THE TORONTO REGION 
because of its gypsum deposits near Paris and of its 
salt beds, which in a moist climate like that of 
Ontario cannot exist at the surface but are found 
beneath the Devonian rocks along Lake Huron and 
to the southwest at depths of several hundred feet 
below the surface. These beds furnish most of the 
salt used in the central provinces of Canada. In 
the State of New York an interesting fauna, includ- 
ing’ large examples of Eurypterus and Pterygotus, 
occurs in impure limestones of this age from which 
cement is manufactured, but the similar beds in 
Ontario have been little exploited. 
Of the Devonian only the lower portion, the 
Onondaga (Corniferous), occurs in the region here 
described. It is found on the north shore of Lake 
Erie not far from Niagara Falls, as low outcrops of 
limestone with many thin layers of chert concretions. 
It is highly fossiliferous, many parts being prac- 
tically coral reefs; and several species of coral may 
be collected in stone heaps in the fields or by the road- 
side. The commonest fossils are: 
Cystiphyllum vesiculosum. 
Favosites emmonsi. 
Heliophyllum halli. 
Syringopora hisingeri. 
Streptelasma prolificum. 
Michelinea convexa. 
Atrypa reticularis. 
Chonetes mucronatus. 
Rhipidomella vanuxemi. 
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