﻿Geological Map, District about Montreal. 253 



crosses the map from east to west. They include Two 

 Mountains, Mount Eoyal, Montarville, Beloeil, Kougemont, 

 Yamaska and Shefford, with Mount Johnson, the moun- 

 tains about Lake Memphremagocr and the Serpentines, so 

 important from their production of asbestos. 



The other economic products mentioned are iron, copper, 

 slate, lime, building-stone, whetstones, brick, and mineral 

 waters. 



The exceeding brevity of this report (92 pp.) is unfor- 

 tunate. This precludes the giving of detailed information, 

 and tends to render the descriptions less definite, or even 

 obscure in places. 



It presents a concise compilation of the work hitherto 

 published and a rather brief statement of the important 

 researches more recently made. 



It would probably have been better to quote from the 

 " Geology of Canada " than to refer to it for important 

 descriptions, since that work has been so long out of print 

 as to have become difficult of access to many of the read- 

 ing public. 



The report, nevertheless, presents much that is of great 

 value and interest to the student of local geology. 



Another welcome aid to local study is the appendix by 

 Dr. H. M. Ami, Assistant Palaeontologist of the Geological 

 Survey. This contains a list of the organic remains 

 found in the different strata. The fossils are classified, 

 first, according to the formations in which they occur, 

 and then in each group they are arranged according to 

 their zoological affinities. They embrace the collections 

 of different workers in this field, notably those of Billings, 

 Whiteaves, Ells, Ami, Weston and Decks, and furnish the 

 data for the determination of most of the chief formations. 

 This appendix is of inestimable value to the investigator 

 of the fossiliferous rocks of this area. 



The chapter on the Laurentian district in the north- 

 western part of the sheet is regarded by the author, Dr. 



