martin.] BERING RIVER COAL FIELD. 143 
and a southeast dip of 58° on the southeast flank. The latter is cut by 
a fault of unknown but probably considerable magnitude. The other 
fold is a sharp syncline which apparently lies in the hills east of Lake 
Charlotte. Its presence is indicated by the fact that the dip of the 
Charlotte seam at the openings above the lake (fig. 9) is southward. 
It is not known how far in either direction this southeast dip continues. 
COAL SEAMS. 
Several valuable seams have recently been opened in the valley of 
Canyon Creek and on the opposite (east) side of Carbon Mountain. It 
is said that of fifteen openings in the same seam on Carbon Mountain 
which showed a range of thickness from 9 to 25 feet, nine openings 
revealed a thickness of 14 feet or more. About a dozen workable 
seams have been reported from this region. The writer has already 
published the following sections of the coal and coke seen by him in 
this vicinity/' those described above not having been opened at the 
time of his visit in 1903. 
Four seams are exposed on the east bank of Canyon Creek. Three 
miles above the mouth a seam has a thickness of 2 feet 9 inches, is 
overlain by sandstone, and has a shale floor. The strike is N. 80° E., 
the dip westward at an angle of 35°. The section was measured at 
the level of the valley bottom. This seam is variable in thickness, 
pinching out somewhat higher in the bluff. 
Four miles above the mouth of Canyon Creek (fig. 9) a seam has a 
thickness of 4 feet 2 inches; it strikes N. 10° E. and dips westward at 
an angle of 60° and has a shale roof and floor. 
At the south end of Carbon Mountain there is a high bluff, where 
Bering River has been pushed against the end of the mountain by the 
Bering Glacier, and here the following section was measured: 
Section at south end of ( 'arbon Mountain, Alaska. 
Feet. 
Sandstone 30 
Coke 1 
Sandstone 20 
Coke 2 
Sandstone 2 to 5 
Coke 1 to 5 
Sandstone 3 
Coke 1 
Sandstone 8 
Coke If to 2\ 
The strike at this point is N. 80° W., the dip is northward at angles 
ranging from 20° to 25°. 
The valley of Stillwater Creek and Lake Kushtaka has been shown 
to contain a great deal of valuable coal. A trail recently built north- 
ward from the western shore of Lake Kushtaka exposes 15 or 16 
a Bull. U. S. Geol. Survey No. 225, 1904, p. 372. 
