coal. 369 



area westward to the < '< >;il Creek fault. The maximum distance which 

 the coal horizon has receded from the fault is about one-fourth mile. The 

 strata on the northwest of the fracture dip 10 to l.V XXW.: on the 

 southwest tln'\ have been but little disturbed. Along the shorl cross- 

 fault wot of the Baker mine the coal measures on its north dip 3° 

 to L0 XXlv: they abut against upper Laramie <>n the south. The 

 triangular interfaull block, considerably fractured, is of no economic 

 importance. Excepting at the Baker mine, the only outcrops of coal on 

 the exposed line of coal measures are one mile northeast of the mine, 

 immediately over sandstone P>. where the thickness is apparently not over 

 "J feet, and several small seams in the bluffs of Coal ('reek just wrest of 

 the mine. Eas1 of the Baker fault the depth at which the coal measures 

 lie is unknown. 



The stratigraphy i»t' the coal measures, a- shown in outcrops in the 

 vicinity of the Baker mine, is merely a variation i>t' that in other regions — 

 rapidly alternating sandstones, lignitic clays, ami occasional narrow coal 



seams; low down in which, in this instance, is the heavy seam worked at 



the mine, the basal sandstones lying -till beneath. A sandstone a short 

 distance above the Baker seam is Locally developed to a thickness of nearly 

 '_'() feet, and, according tu .Mr. Davis, the manager, in places lie- directly 

 on the coal. A thin bed of fire-clay usually underlies the coal. 



The Baker mine. (Fig. 1 >. PI. XIX.) This IS located Oil tile lielicll hllld 



east ni Coal Creek, about three-fourths of a mile north-northeast of its 

 confluence with Rock ("reek. The mine is opened l>v a slope mi the 

 seam, the strike of which is about N. .'57 E., the dip averaging 1.")° 

 NW. The seam worked is probably either No. 2 or .'!, possibly both, 

 consolidated. The coal lies in two benches, the lower about 1 feet thick, 

 the upper 7 feet, separated by 7 or 8 inches of slate, which is persistent 

 throughout the mine. ( >f the lower bench the lower 36 inches is a fibrous 

 coal, the ii inches above a "curly" coal, while the remainder has a con- 

 choidal fracture and is clear and bright. The upper bench carries rather 

 more iron than the lower, and is a softer coal. The coal of both benches 

 is of considerable solidity and works in large Mocks. 

 MOM XXVII 24 



