8o 



of the Jura-Cretaceous rocks of Yukon. No 

 coal has as yet been discovered in these beds 

 between Hootalinkwa and Big Salmon, possibly 

 because they have not been prospected, as 

 everywhere in Yukon where a complete section 

 of these rocks is known to occur, valuable coal 

 seams have been found in them. In fact the 

 best coals so far found in Yukon occur in these 

 conglomerates. The Jura-Cretaceous rocks and 

 the coals in them are described later under 

 "Tantalus Coal Mine." 



On the right limit of the river opposite these 

 conglomerates below Hootalinkwa, the rocks 

 are volcanics, dominantly of andesitic types. 

 The Semenof hills appear to be mainly composed 

 of somewhat basic volcanics probably of Jurassic 

 or Cretaceous age. 



236 m. Big Salmon River — Below Big Salmon river 



378 km. the Lewes turns to the west, almost at right 

 angles to its previous course, and flows in a 

 northwesterly direction to Tantalus. Between 

 Big Salmon to Little Salmon river, the valley is 

 for 8 or 10 miles (13 or 16 km.) more than 

 usually constricted, but just below Little 

 Salmon, the Lewes comes into a wide basin 

 extending several miles from the river on its 

 left limit. Both Big Salmon and Little Salmon 

 rivers, for several miles from the Lewes, occupy 

 broad flat depressions. Splendid exposures and 

 sections of silts occur along this portion of the 

 river. The rock exposures between Big Salmon 

 and Little Salmon consist dominantly of 

 Mesozoic andesites, basalts and related rock 

 types — tufaceous members being prominent at 

 some points. 



271 m. Little Salmon River — An Indian village and 



434 km. trader's post is stationed at the mouth of Little 

 Salmon river, which possess considerable interest 

 for strangers in this district. Steamers fre- 

 quently stop here to take on wood for fuel, 

 allowing passengers a half hour or so to go 

 ashore. 



