coal. 373 



past. Chief among these are the McKissic, about 1<> miles northeast of 

 Erie; the Platteville, near Platteville; the Excelsior, near Evans, and the 



Eaton ana Brown, near Eaton, all stations <>n the Union Pacific Railroad, 

 from 25 to 60 miles north of Denver. Tlie measures are in direct con- 

 tinuation with those of the Denver field. 



Till: SGBANTOH CO \I. FIELD. 



This tield lies at the head of Second Creek, about 2(1 miles east of 

 Denver, the meridian of 104 c 40' passing just east of the settlement. It 



is impossible from surfac tcrops to define the limits of the held, but 



then- is believed to he an area of at least l."> to '_'<( square miles over which 

 a workable thickness of coal, except for local thinning, is likely To he found. 

 A seam is opened at Scranton which has a thickness of over 10 feet, includ- 

 ing partings; coal is also reported, 6 feet thick, at a. depth of '.to feet, in a 

 prospect shaft about •"> miles south-southwest of Scranton, just north of the 

 Kansas Pacific Railroad; again, in two other shafts between the latter and 

 the Scranton mines, of about the same thickness; in traces, also, about .">A 

 miles southwest of Scranton. three-fourths of a mile north of the railroad; 

 and, finally, in the bluffs of Sand ('reek, where a (1-foot bed may he seen 

 in ai'enaceous clays and sandstones. In the last locality, lu feet above 

 the coal, is a heavy bed of Monument ('reek sandstone, a marked line of 



unconformity showing between it and the underlying series. The Monu- 

 ment Creek formation is also found directly over the coal in the immediate 

 vicinity of the Scranton mine. Eastward from these localities it extends 

 far beyond the area mapped. The coal of this field is all of the upper, 

 shaly division of the Laramie. 



The structure of the Scranton coal field is apparently that of hori- 

 zontal or slightly undulating strata for the area in general, with sharper folds 

 and steeper dips in particular localities. Faults have not keen detected. 

 although it would he surprising if an area of this extent and character 

 should be entirely devoid of them. The strike of the beds at the Scranton 

 min.' is X. i:,° W., the dip 3° to 5° E. 



The general character of the bed mined at Scranton and the strata with 

 which it is associated are shown in the following section (fig. 16), reported 



