NORTH SYDNEY AND SYDNEY MINES, C. B. — DkWOLFE. 297 



section of 179 feet in vertical thickness, beginning at the bottom 

 and ending with the Millstone Griit, is as follows : — 



red shale 2 ft. 



gray limestone 2 



gTay, hard sandstone — 6 inches. 



mottled brown calcareous sandstone. . 20 



. red calcareous marl 10 



g^'psmn 8 



clay marl with gypsum stringers .... 10 



limestone 2 



marl 8 



thin bedded flaggy red sandstone .... 20 



-marl " 10 



brown rippled sandstone 20 



gTeen marl 8 



flaggy sandstone 15 



limestone and marl 12 



mottled sandstone 20 



(ironstone 12 



179 ft. 6 inches. 



Ironstone contact beds. — The last twelve feet of the lime- 

 stone formation consists of a hard and somewhat felspathic 

 rock, light flesh in color, and containing a variable quantity of 

 hematite. The corresponding rocks on the opposite side of the 

 harbor contain more iron. The surface of the exposures softens 

 and crumbles to a depth of half an inch. 



ISTo topoPTaphic change marks the contact of the two form- 

 ations. The exact contact is, indeed, concealed. On the map 

 sheet of the geological Survey of Canada (Sydney sheet, 134), 

 Limestone brook is regarded as the dividing line ; but at its 

 mouth it is well into the Millstone Grit. Here Limestone 

 creek, the tidal portion of the brook, makes in for about 200 feet 

 with a depth of eight to ten feet, after which it shoals to two or 

 three feet and swings westerly, almost parallel with the harbor. 

 This brings the mouth of the brook proper about 800 feet from 

 harbor front. 



