198 .1. I'.. TYIMIIilJ. GLACIAL I'il lONOMEXA IN YUKON DISTltKT 



no evidence whatever of marine conditions or of recent submergence of 

 the land. Any regularity in heiglit of the highest terraces is easily ac- 

 counted for by the moderately regular average tliickness of the ice-sheet 

 when the lakes were in existence. 



IN THE DA WSON DISTRICT 



As small glaciers now exist in the valleys of the mountains north of 

 the Chilcat range, so small glaciers formerly existed in some of the 

 mountain valleys north of the main ice-sheet of the Glacial period. 

 Such glaciers existed in the valleys of Eldorado and Bonanza creeks, 

 near Dawson, and flowed down these valleys at least to some point l)elow 

 the confluence of the two creeks. Beautiful glacial stride were seen on 

 the hard quartzose rocks at the mouth of Big Skookum gulch, on the west 

 side of Bonanza creek, which had been made by this glacier, furnishing 

 indisputable evidence of its presence. A lateral moraine of this glacier, 

 often containing pebbles and small boulders of distinct glacial shapes, 

 extends along the side of the valley from 150 to 200 feet above the creek, 

 and in it are some of the rich bench claims on Eldorado hill and at 

 French gulch, and the sand and gravel in the bottom of the valle}' is 

 well rounded, but roughly assorted material, such as is constantly 

 washed down and distributed by glacial streams. 



