[ARTIN.] 
BERING RIVER COAL FIELD. 
141 
rni of Bering Lake. The coal is known to extend as far northward 
I the Martin River Glacier and as far eastward as the valley east of 
Carbon Mountain. This area includes about 120 square miles. It is 
pssible that further exploration will reveal the presence of coal north 
»f Martin River Glacier in the foothills of the Chugach Mountains, 
>r in the region to the east of Carbon Mountain. 
Fig. 8.— Sketch map of Bering River coal field. 
The lowlands bordering the northeast shore of Bering Lake and 
xtending for a considerable distance up the valleys of Shepherd Creek, 
Bering River, and other streams are doubtless underlain with coal. 
?he covering of mud and other soft deposits is probably ver}^ thick, 
nd the uncertainties of deep mining below it are so great that these 
ands must now be regarded as of very doubtful value. The same 
pplies to the region covered by the Bering, Martin River, and Kush- 
aka glaciers (fig. 8). The estimates given above of the coal area 
