15 



inches 



4 





30 





J 





3 





I 





356 W. H. WEED — COAL FIELDS OF MONTANA. 



excellent and meets with a ready market, but the property must necessarily 

 be limited by the fault, although the owner is convinced that the coal runs 

 under the gneiss. 



An incline follows the coal, which dips eastward at an angle of 40° at the 

 surface, but becomes 60° some 100 feet below. At present this incline is 175 

 feet deep, and the seam is but little worked on the levels. The seam shows 

 two to three feet of clean, brilliant coking coal, underlain by a thin parting, 

 with a lower bench of bony coal that is not worked. 



About 40 feet above this seam the outcrop of another large seam shows 

 the following section : 



Top coal 



Fire-clay 



Coal 



Clay 



Coal 



Parting . 



Bottom coal 



An igneous rock similar to that found at the Horr mine occurs in the 

 coal rocks on this side of the river, and is clearly intrusive, cutting across 

 the beds. 



A section of the beds on the southern side of Trail creek, at the Bowers 

 mine, shows eleven seams of coal aggregating 21 feet ; but only two of the 

 seams can be worked. The following section shows the position of the veins : 



Section of Coal- Pleasure Sandstone at the Bowers Mine. 



Number Thickness 



Massive sandrock, firm, light-gray. 



Coal seam. 



Sandstone, breaking into small angular fragments. 



Shale, dark-gray. 



Coal seam. 



Shale, hard and slaty. 



Sandstone, with shelly structure. 



Coal ; middle seam. 



Red limestone, very magnesian. 



Sandstone. 



Coal; called by the miners "upper bastard vein." 



Sandstone, thinly fissile, brown. 



Coal. 



Sandstone, shaly at top. 



Coal. 



Fissile and leafy sandstone. 



Sandstone, massive, with jointed surfaces rounded. 



Coal ; poorly defined ; vein 2 or 3 feet ; the rest shale. 



Sandstone, massive, brown, much pitted by weathering. 



Coal. 



of bed. 



in feet 



28 



30 



27 



h 



26 



10 



25 



1 



24 



6 



23 



12 



22 



10 



21 



3 



20 



6 



19 



3 



18 



1 



17 



30 



16 



1 



15 



10 



14 



4 



18 



20 



12 



30 



11 



6 



10 



15 



9 



2 



