REVIEWS 421 



the mountains are of sufficient altitude to support glaciers now, but glacial phenomena 

 due to the Cordilleran ice-field are everywhere strikingly evident. The average 

 direction of striation when uninfluenced by local causes is about S, 30" E. Drift 

 "terraces" are numerous at all altitudes, up to 2,000 feet above the valleys. Since 

 glaciation the surface oxidation and weathering has been very slight, 



Daly, R. A. Geology of the Region Adjoining the Western Part of the 

 International Boundary. Geol. Surv. Canada, Summary Rept. for igoi, 

 PP- 37-49. 1902. 



The area discussed embraces a tract eighty miles from west to east and ten miles 

 in width on the north side of the international boundary from the Gulf of Georgia 

 eastward. The glacial geology is mainly treated on pp. 41-5, and embraces a brief 

 discussion of glacial erosion and denudation, cirques, mountain tarns, and small 

 lakes, river terraces, and deltas. A morainal dam which holds in Chilliwack lake is 

 also described. This lake stands 1,850 feet above the sea, and the granite walls rise 

 steeply 3,000 to 4,500 feet higher, with truncated spurs between tributary gulches that 

 indicate a large amount of glacial erosion. 



GwiLLiM, J. C. Glaciatioji in the Atliti District, British Columbia. Jour. 



Geol., Vol. X, pp. 182-5, igo2. 



The great valleys of northern British Columbia show evidence of glacial action 

 which occurred after the valleys had reached about their present dimensions. There 

 appears to have been regional glaciation followed by a partial or local glaciation. 

 There is also a present active glaciation in coast ranges to the westward. The 

 regional glaciation left its marks on the slopes up to an altitude 5,000 feet above the 

 valleys, and the movement was northward. The local glaciation was restricted to the 

 upper valleys and slopes, but did not cover the high parts of mountains. 



The paper closes with a brief description of the Llewellyn glacier near Atlin 

 lake. The upper surface of the ice-field is about 5,000 feet above sea level or 3,000 

 feet above Atlin lake. 



McCoNNELL, R. G. The Yukon District. Geol. Surv. Canada, Summary 



Rept. for 1901, pp. 23-37, 1902. 



Results of examinations at several of the smaller placer camps in the Yukon dis- 

 trict are presented. Livingston creek valley shows evidence of glacial action in its 

 upper part and heads in a steep amphitheater. In most of the creek valleys the 

 terraces and terrace material are reported to consist of ordinary stream wash, and no 

 , mention is made of glacial action. 



Parkinson, J. Some Lake Basins in Alberta and British Columbia. Geol. 

 Mag., Decade 4, Vol. VIII, pp. 97-101, 1901. 



Lake Agnes in the Canadian Rocky mountains is found to be in a rock basin. 

 Mirror lake, into which it discharges, is not so clearly a rock basin. Lake Louise, 

 farther down the valley, probably receives the discharge from Mirror lake by under- 

 ground channels. Whether Lake Louise is a rock basin is not certain. Lake Marion 

 in the Selkirk range is another case in which the evidence is not clear as to its being 

 a rock basin. Among the agencies which may have been operative in producing the 

 Lake Agnes rock basin, warping, glacier erosion, and decay of soft rocks in the upper 

 end of the basin should be considered. The soft rocks might have been removed 

 • hither by stream or glacier action. 



