42 



ITINERARY AT SUDBURY. 



First Day. 



8 a.m. — Sudbury to Ramsay Lake. 



Sudbury, alt. 855 ft., (260.6 m.), chief town of the 

 nickel region with a population of about 5,000, is situated 

 on a flat plain of silt deposited in a bay of lake Algonquin. 

 Above it rise hills of the Sudbury series of rocks. 



A walk of two hours' duration will be taken through the 

 town to Ramsay lake, crossing well stratified and steeply 

 tilted greywacke (McKim greywacke), partly brecciated 

 during the advent of the nickel eruptive. On the shore of 

 the lake and on islands pale grey quartzite dips at an angle 

 of 45 degrees southwest. It extends in that direction six 

 miles (9.6 km.) and is estimated to have a thickness of 

 15,000 feet (4,500 m.). North of Ramsay lake the Basal 

 Huronian tillite is seen resting unconformably on the quartz- 

 ite. It contains pebbles and boulders of quartzite, grey- 

 wacke and granite. 



Northwest of the conglomerate a hill of laccolithic gabbro 

 will be visited, halting first at a dike of fresh olivine diabase. 

 Climbing the hill there are good views of the town and of 

 Ramsay lake. On top of the hill one may study certain 

 curious " roof pendants " (or acid segregations) having 

 quartz in the centre, followed by pegmatite and by coarse- 

 grained hornblende-albite rock, with a rim of hornblende in 

 large bladed crystals. 



From the laccolithic hill the party will return through 

 the town to the special train. The total distance walked is 

 two miles (3.2 km.). 

 10. a.m. — Sudbury to Levak. 



Leave Sudbury by special train on the main line of the 

 C.P.R. going northwest for I 1 /, miles (2.4 km.) through 

 McKim greywacke, followed by pink arkose, (Copper Cliff 

 arkose), following for some distance a great dike of diabase 

 which may be seen in cuttings. After a steady ascent of 

 four miles (6.4 km.), the latter part through greenstone and 

 granite, the summit is reached at Murray mine, alt. 992 

 feet, (302.3 m.), where the railway crosses the gossan- 

 covered edge of the nickel-bearing norite. Murray mine is 

 one of the oldest of the nickel mines in the district but has 

 not been regularly worked for many years. 



