42 2 



THE POPULAR SCIENCE MONTHLY 



Davis Camp ox Canton Creek. These buildings are on the claims of the Alaska Coal 



and Petroleum Company. 



Looking toward Slope Glacier from the Hartline Claims. It shows the structure 

 of the coal-bearing rocks in this part of the field. 



tiarv sediments in the northeastern part of the field are narrow dikes 

 and sills of diabase and basalt which are either Tertiary or post-Ter- 

 tiary in age. The morainal deposits extend beyond the present limits of 

 glaciation only a few miles. 



The Tertiary sediments have been divided by Dr. Martin into three 

 formations, namely, the Stillwater, the Kushtaka and the Tokun. The 

 Stillwater is the oldest formation, and consists chiefly of sandstone 

 and shale with a thickness of about 1,000 feet. The Kushtaka overlies 

 the Stillwater conformably and is that part of the Tertiary which con- 

 tains the beds of coal. It has a thickness of about 2,000 feet made up 

 of coarse arkose, sandstone, shale and beds of coal. Complete sections 



