NATURAL HISTORY, TORONTO REGION 



The lower sandstones and shales at Niagara are 

 poor in fossils, but the Clinton, Rochester and Lock- 

 port beds contain a considerable fauna, the common- 

 est species near the Falls being Spirifera niagarensis 

 and Atrypa reticularis. 



The Guelph dolomite should in reality be separ- 

 ated from the Niagara, since it differs so greatly in 

 petrographic characters and in fauna from the lower 

 members of the series. It nowhere appears in the 

 escarpment, but may be seen in quarries near Guelph, 

 Gait, Elora and other places on the tableland. The 

 rock is yellowish and porous from the weathering out 

 of fossils, which are numerous. The commonest 

 forms are Megalomus canadensis and species of Mur- 

 chisonia and Pleurotomaria. The fossils are gener- 

 ally large species as compared with the Niagara 

 fossils in the beds below. 



Coelocaulus (Murchisonia) macrospira. 



Poleumita sulcata. 



Conchidium (Pentamerus) occidentale. 



Eotomaria galtensis. 



Megalomus canadensis. 



Pycnostylus galtensis. 



Halysites catenulatus. 



Trimerella grandis. 



Whitfieldella hyale. 



Calymene niagarensis. 



The Salina, lying farther to the southwest, is not 

 well displayed in Ontario, but is of importance 

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