520 JRevieics — Geological Survey of Canada. 



a, .--2 1 J / Indian Eiver Series, 



btratmea and I tt i o • 



r. T . J , \ Hunker beries. 



loliated rocks, < t^, -... „ ■ 



,1 -T) 1 . 1 Klondike beries. 



mostly ralseozoic. f ,„ tt-j /-i /• i.\ 



'' \ Moose Hide Group (in part). 



Tertiary. 



-ri ,. , ( Granites, 



Jliruptive rocks. ] t i. l- 



^ ( Liater eruptives. 



The gravels along the creeks in which the gold is worked fall 

 into five groups ; beginning with the oldest, they are the quartz-drift, 

 followed by the associated yellow-gravels, the river-gravels, the 

 terrace-gravels, and the valley-gravels. Of these the valley-gravels, 

 the quartz-drift, and the terrace-gravels have proved productive. 

 Thousands of streams, it is stated, in the gold belt stretching for 

 hundreds of miles from Atlin to the Klondike and farther to the 

 north, still remain to be explored, and the work of the prospector 

 will not be completed for many years. A map of the Klondike 

 goldfields accompanies the report. 



Next we have summaries of the work done in British Columbia, 

 the Mackenzie and Saskatchewan districts, Ontario, Quebec, Hudson 

 Bay (east coast), New Brunswick, and Nova Scotia ; these abstracts 

 anticipate to some extent the detailed reports following them. The 

 first of these (Report B) is on the Atlin Mining District, British 

 Columbia, by J. C. Gwillim, and contains an account of the drainage 

 basin of Atlin Lake with the country to the east of it, " in all some 

 6,000 square miles of the extreme north-west corner of British. 

 Columbia." The district here defined has recently come into notice 

 as a placer gold-producing area of much importance. The report 

 begins with a description of the topography of the district surveyed, 

 and this is succeeded by an account of its geological features, and 

 especially of the pre-Glacial gravels with their gold contents. 

 A contour-map, geologically coloured, and three plates illustrating 

 the methods of working on the larger streams and in the pre- 

 Glacial gravels, accompany the report, 



Eeport C, by J. M. Bell, deals with the topography and geology 

 of Great Bear Lake and of a chain of lakes and streams thence to 

 Great Slave Lake, A description by Dr, A, E. Barlow of the rocks 

 collected is given as an appendix, 



Dr, R. W. Ells contributes a report (G) on the geology and 

 natural resources of the area included in the map of the city of 

 Ottawa and vicinity. The map is on a scale of one mile to an inch 

 and embraces a total of 450 square miles, the city of Ottawa being 

 taken as the central point. 



The formations recognized in this area range from the Archsean 

 to the Silurian, as follows : — 



Medina Red Shales. 



Lorraine Shales and Sandstone, 



Utica Shale, 



Trenton Limestone, 



Black River Limestone. 



