29 



Kilometre! over I0 ° m ^ es i 1 ^ 1 km.) in a general east 



and west direction, roughly parallel to Lake 

 Ontario and a few miles north of the lake. 

 The drift in the hills, which rise to an altitude 

 of 600 to 900 feet (182.9 m - to 274.3 m -) 

 above Lake Ontario, is known to be of con- 

 siderable thickness. At Thornhill, 14 miles 

 (22.5 km.) north of Toronto, a well boring 

 penetrated 640 feet (195. 1 m.) of drift before 

 reaching the Trenton limestone which was 

 the first solid rock formation encountered. 

 The boring continued through 585 feet (178.3 

 m.) of the Trenton, Black River and Lowville 

 formations to the Pre-Cambrian. 

 27.2 m. Chesley. Alt. 980 feet (298.7 m.). One 



43.8 km. mile south of Chesley station, the summit on 

 the line of railway is passed at an altitude of 

 1,002 feet (305.4 m.). Going northward, 

 the railway rapidly descends in o a broad 

 valley which extends, nearly at the level of 

 Lake Simcoe (low water 718 feet, 218.9 m.), 

 for some 20 miles (32 . 2 km.) southward from 

 the head of the lake. This valley was occu- 

 pied by a deep embay ment of Lake Algonquin, 

 the shoreline of which is well marked on both 

 sides of the valley. Near the village of 

 Sch mberg, at a point about 15 miles (24.1 

 km.) south of the extreme head of the lake, 

 the Algonquin beach has an altitude of 724 

 feet (220.7 m -)i only 6 feet (1.8 m.) above 

 the level of Lake Simcoe. 



41.2 m. Bradford. Alt. 724 feet (220.7 m -) At 



66 . 3 km. the town of Bradford, a well boring penetrated 



330 feet (100.6 m.) of drift deposits before 

 reaching the Trenton limestone. The terrace 

 and bluff of the Algonquin beach near the 

 station, has an altitude of 749.0 feet (228.3 

 m.). At Lefroy 10 miles (16. 1 km.) further 

 north, the beach which may be seen on the 

 west side of the railway near the station, rises 

 to 774 feet (235.9 m 0- 

 64.0 m. Barrie. Alt. 726 feet (221.3 m -)- The 



103.0 km. town of Barrie is situated at the head of 

 Kempenfeldt bay, an arm of Lake Simcoe. 



