GEOLOGY OF THE TOKONTO KEGION 



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 

 i 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- 

 1 side. The commonest fossils are: 



Cystiphyllum vesiculosum. 

 Favosites emmonsi. 

 Heliophyllum halli. 

 Syringopora hisingeri. 

 Streptelasma prolificum. 

 Michelinea convexa. 

 Atrypa reticularis. 

 Chonetes mucronatus. 

 Khipidomella vanuxemi. 

 65 





