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The lower sandstones and shales at Niagara are poor in fossils, but the Clinton, Rochester and Lock-port beds contain a considerable fauna, the commonest species near the Falls being Spirif era niagarensis and A try pa reticularis.

The Guelph dolomite should in reality be separated 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, Galt, 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 Murchisonia and Pleurotomaria. The fossils are generally 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 64

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