NOTES ON A GRANITE CONTACT ZONE, NEAR HALIFAX, N. S. 

 BY PROF. D. S. MC!NTOSH, M. Sc., Dalhousie Col- 

 lege, Halifax, N. S. 



Read May 12th, 1913. 



A " Quebec and Maritime Provinces" excursion forms 

 part of the programme of the Twelfth International Geo- 

 logical Congress which meets in Toronto in August of this 

 year. According to the first planned arrangement, the 

 party when at Halifax was to have visited a contact zone of 

 the granite and slate in the vicinity of Chocolate Lake. 

 Owing, however, to a change in the date of meeting of the 

 Congress and some re-arrangement of itineraries, the party 

 reaches Halifax on Sunday morning and departs early the 

 following day. The proposed trip to this interesting locality 

 was consequently abandoned. But while it was in con- 

 templation some preparation was made for it. Dr. Young, 

 who has charge of the excursion, together with Mr. Faribault 

 and the writer of this paper, examined the rock of the district 

 and procured specimens wherever there was any noticeable 

 difference of texture or mineral constituents. From these 

 specimens a series of microscopic sections were made. These 

 thin sections the Geological Survey very kindly placed at 

 the disposal of the writer for the preparation of this paper. 



The granite batholith which forms the bed-rock of a 

 large portion of the western part of the Province meets the 

 metamorphosed sedimentary rock close to the southwestern 

 shore of the North West Arm. The boundary line is irregular. 

 Running in a general northwesterly direction from the Dingle, 

 it passes south of Chocolate Lake, follows pretty closely the 

 main road to Lily Pond, bends around between First and 

 Second Chain Lakes, and thence has a westerly direction 



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