THE BERING RIVER COAL FIELD 



423 



Part of the Cunningham Claims. Taken from divide west of Kushtaka Glacier. 



Overlooking First Berg Lake and Bering Glacier fbom the Green Claims. 



of the formations are not well exposed, and hence the number of seams 

 of coal is not well known. The evidence suggests more than a dozen 

 seams, varying in thickness from 6 inches to more than 35 feet. The 

 Tokun formation overlies the Kushtaka conformably aud consists of 

 about 2,500 feet, chiefly of sandy shales, but containing also, sandstone 

 and a subordinate amount of limestone. All the evidence thus far 

 found indicates that the Stillwater formation is marine, the Kushtaka, 

 non-marine, and the Tokun marine. 



The Structure of the Region - 



The structure of the rocks of the coal field is, in genera], mono- 

 clinal, the most prevalent strike being northeast: the dips are usually 



