Reviews 



Physiography of the Beaver dell Map- Area and the Southern Part of 

 the Interior Plateaus of British Columbia. By Leopold 

 Reinecke. Geol. Surv., Canada, Museum Bull. No. n, 

 1915. Pp. 58, pis. 5, figs. 3, map 1. 



A study of the Beaverdell area is of value because its history is 

 characteristic of the whole plateau region of British Columbia. Follow- 

 ing the eruption of lavas (Nipple Mt. series) in early Miocene a mature 

 topography was developed. Late in the Tertiary the canyon-cutting 

 stage was inaugurated by an uplift of about 1,000 feet. Pliestocene 

 glaciation, first by continental ice from the north and later by valley 

 glaciers, modified the youthful topography. The present areal ratio of 

 uplands to valleys is three to one. 



H. R. B. 



Report on the Copper Deposits of the Eastern Townships of the 

 Province of Quebec. By J. Austen Bancroft. Dept. of 

 Colonization, Mines and Fisheries, Mines Branch, 1915. 

 Pp. 295, pis. 10, tigs. 9, map 1. 

 Lenticular bodies of pyrite carrying a little chalcopyrite occur in 

 highly metamorphosed igneous and sedimentary rocks. A large pro- 

 portion of the deposits have been formed by irregular impregnation 

 and replacement along shear zones within altered igneous rocks. Other 

 deposits occur at the contacts of the intrusives and as impregnations 

 or partial replacements of limestones. The schistose intrusives seem 

 to have been the source of the sulphide ores. 



Development in this region was begun during the Civil War, when 

 the price of copper was abnormally high. Since 1869 only a few com- 

 panies have operated. Four properties have yielded large profits; no 

 others have repaid the money spent upon them. The future develop- 

 ment of the mines depends largely on the utilization of the sulphur 

 content of the ores in the manufacture of sulphuric acid, or other 

 chemicals. 



H. R. B. 



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