104 



common in the talus derived from this member. This 

 fact is of great stratigraphic importance, as farther south 

 the member is entirely unfossiliferous and has been 

 ascribed to the Medina. 



Cataract formation. — The lower Cataract limestones 

 and shales contain practically the same fauna as at Catar- 

 act (See guide book to Excursion B 4). 



The upper or more shaly part of the Cataract is very 

 much covered with talus, nevertheless some fossils charac- 

 teristic of the formation may be obtained from this 

 member. 



Lockport formation. — The heavy dolomitic limestone 

 of the Niagara (Lockport) forms the top of the section, 

 and, owing to its white appearance, constitutes a con- 

 spicuous element in the landscape. Percolating waters 

 have formed some interesting caves in the dolomite near 

 Mair's Mills. A few fossils may be collected here, but 

 the locality is by no means a rich collecting ground for 

 Lockport species. 



BIBLIOGRAPHY. 

 Welland Peat Bog. 



1. Carter, W. E. H.. . .Bureau of Mines, Ontario, Vol 



XII, p. 203, 1903. 



Port Colborne. 



2. Ami, H. M Synopsis of the geology of Can- 



ada. Can Roy. Soc, Proc. and 

 Trans., new ser., Vol. 6, Sect. 4, 

 pp. 187-225, 1900. 



3. Chapman, E. J An outline of the geology of 



Ontario. Can. Jour., Vol. 14, 

 New Series, pp. 380-389, 1875. 



4. Haas, Hippolyt Zur Geologie von Canada. Peter- 



mann's Mitteilungen, Bd. 50, pp. 

 20-28, 47-55, 1904- 



5. Logan, Sir William .Geology of Canada. Geol. Surv. 



of Can. pp. 361-379, 1863. 



