136 THE CANADIAN NATURALIST. [Yol. X. 



Section III. (at Hamilton). 



This section was measured along the brow of the escarpment at the 

 city of Hamilton, between the ravine at the head of James street 

 and the "Jolly Cut" road, about half a mile to the eastward. 

 The section is in descending order. The numbering of the beds 

 connects the section with the corresponding beds at Dundas. 

 (See note in Appendix.) 



Beds. Niagara Formation. Thickness. 



No. Feet. 



12 Thin gray dolomites, with an abundance of cherty 

 nodules. This bed is known as the " Chert Bed," 

 and forms the brow of the escarpment at Hamilton 

 and eastward, being 388 feet above lake at head of 

 James street. At head of Queen street this series 

 is 19 feet thick 12.0 



11 Argillaceous dolomites, with shaly partings — upper 

 k portion known as the "Blue Building Beds." Beds 

 10 0.5-1 foot thick. (See analysis and fossils.) 15.5 



9 Dark hard dolomitic shales and dolomites weathering 



to gray — and lower beds most shaly. (See analysis.) 10 . 5 



8 Thick bed gray crystalline dolomite (nearly pure).. , 4.5 



7 Argillo-arenaceous dolomite in beds from 1-1.5 feet 



thick. (See analysis) 8.8 



51.3 



Clinton Formation. 



Qh Earthy dolomite, with shaly partings 8.0 



6a Chinton shales, all dolomitic, with thin beds of harder 

 rock, some of which are arenaceous, and others to 

 a thickness of about 7 feet, are areno-ferruginous. 

 The upper 9 feet may be considered as passage beds 76 . 9 



5 Passage beds of argillaceous dolomites. (Top project- 

 ing portion is glaciated, and is 254 feet above lake) 8.8 



Medina Formation. 



4& 3 Coarse gray sandstone — " Gray Band." This bed 



varies in thickness 6.5 



2& 1 Medina variegated red and green shales. Thickness 



from calculation of Dundas Artesian Well 538 . 5 



93.7 



545.0 



Total thickness 690 . 



