From Little Salmon river to Tantalus, the 

 Lewes is extremely tortuous and has an average 

 current of about 4 miles (6-4 km.) per hour. 

 The hills on the right bank of the Lewes in the 

 vicinity of Little Salmon are open, high, and 

 bare, and attain heights from 1,000 to 1,500 

 feet (300 to 450 m.) above the river in the 

 vicinity. Terraces occur along considerable 

 stretches of the river, at various elevations up 

 to 200 feet (60 m.) above the water. 



The rocks outcropping along the right limit 

 of the river below Little Salmon to Eagles Nest, 

 9 miles (14 km.) distant, are all Jura-Cretaceous 

 sediments of the Laberge series and consist 

 dominantly of conglomerates, sandstones, gray- 

 wackes, and shales. At Eagles Nest, is a 

 small but conspicuous hill of light coloured 

 Devono-Carboniferous limestone, which can be 

 distinctly seen underlying the Laberge beds. 

 From Eagles Nest to Tantalus the Jura- 

 Cretaceous rocks are exposed continuously 

 along the right limit of the river, and as the 

 dips are low and the strike of the beds about 

 parallel with the general trend of the river for 

 a considerable distance, the same conspicuous 

 reddish sandstones and conglomerates extend 

 along the river for several miles at about the 

 same elevation above the water. 



The limestone beds at Eagles Nest extend 

 across the river and are extensively developed 

 to the south. On the left limit of the river 

 below Eagles Nest a somewhat prominent ridge 

 trends in a northwesterly direction and reaches 

 the river about 17 miles (27 km.) below Little 

 Salmon. The rocks composing the ridge are 

 dominantly basic volcanics, and closely resemble 

 those of the Semenof ridge near the river. 

 From below the point where these beds outcrop 

 on the river to Tantalus, the rock exposures 

 are all Jura-Cretaceous sediments. 



In pre-Pleistocene time, Lewes river as above 

 mentioned, instead of following the course of 

 the present Thirtymile river below Lake La- 

 berge, swung to the west through Ogilvie valley 

 and continued northward through a broad 

 34883—6 



