374 The American Geologist. December, 1903. 
er than the Hellgate valley, between Drummond and Gold 
Creek, and also north of Drummond, and in this formation 
a fair grade of lignite is found. It might be, however, that 
these three formations will all yield good lignite. 
Beaverhead County. 
This county has many natural resources including graph- 
ite, and lignite is found in several localities, but little develop- 
ment work has been done and not much is known of the thick- 
ness, extent, or geological formation of the beds. 
Chouteau County. 
This county is crossed by the Great Northern Ry., and cut 
from S. W. to NT. E. be thi ri river. Fort Benton is 
the county seat and lignite beds are found around this town. 
Also a large area to the north, occupying nearly all of the central 
portion of the county. This undoubtedly belongs to the plains 
Cretaceous formation. 
Lewis and Clarke County. 
This county has several coal outcrops north of Helena 
on the east base of the Rocky mountains. Near Rock creek 
is found some fair semi-bituminous Cretaceous coal, also in the 
northern part of the count}" near Augusta is found some fairly 
good mines of ordinary bituminous coal. But very little work- 
has been done on these mines, and their extent is not known. 
However, the coal is of good quality and it is thought the places 
will yield well when developed. The beds in the northern part 
are probably a continuation of the Teton coal beds, and also a 
part of the Great Falls field. 
Cascade County. 
The Great Falls and Belt fields extend over a portion of this 
county, and one of the best developed districts is that of Sand 
Coulee and Cottonwood. These are small towns south and east 
of the city of Great Falls on a branch of the Great Northern 
Ry. Belt is another coal and coke producing town east of 
Sand Coulee on the Great Northern Ry. The mines from these 
places supply the coal and coke used in Great Falls and by the 
( ireat Xorthern railway. The coal is a fairly good bituminous 
variety and belongs to the Cretaceous formation. Other fairly 
good beds are found near the mouth of Smith river. Only a 
