WHITE] POTTSVILLE FORMATION ALONG SHARP MOUNTAIN. 847 



In the former section the supposed Heister bed is nearly 870 feet above 

 the horizon of Bill's bed, while in the latter section it is only aliout 420 

 feet, less than half as far. 



Similarly, the section at the Black Spring Gap, often cited as Mount 

 Eagle Gap, when compared with that in either Gold Mine Gap or 

 Rausch Creek Gap, presents a series of intervals and coals which suggest 

 several tentative correlations. Thus the horizon which I have desig- 

 nated in PI. CLXXXVl, Fig. 2, as the place of the Buck Mountain 

 (Twin) coal is probably on the same stratigraphic level as BilFs bed in 

 Rausch Gap, or the lower coal at Gold Mine Gap. Likewise the hori- 

 zon higher in Black (Spring Gap, described by Taylor as "traces of a 

 southern coal," would seem to correspond directly to the first coal above 

 the Buck Mountain in Gold Mine Gap, while the "4-foot" beds in both 

 gaps will, in that case, be on the same stratigraphic level; but if, as 

 would seem naturalh' to follow, the "Peacock" coals in both sections 

 are in reality equivalent, then we must conclude not only that the 

 Pitch bed is not developed in the Gold Mine Gap, l)ut also that the rep- 

 resentative of the next coal above the "Peacock" bed at Gold Mine is 

 identical, if exposed at all at Black Spring Gap, with the Black Spring 

 coal. The Mount Eagle coal, the next higher in the latter gap, and 

 the second coal opened above the "Peacock" coal in Gold Mine Gap, 

 both of which are coincidently situated at the same distance from the 

 Twin coal, prol^ably represent the same bed. But, in order tt) illus- 

 trate the ease with which sections containing a number of well-distrib- 

 uted coals may l)e in dili'erent ways adjusted to one another, while at 

 the same time pointing out certain other probable coincident similarities 

 between the Black Spring section and that at Rausch Gap, let us 

 assume that the horizon designated as "traces of a southern coal" in 

 the former gap represents the Bill's bed in the latter. In that case, 

 we shall find not only that the "4-foot" coal lies at essentially the 

 same distance above the second coal in Gold Mine, but also that the 

 "Peacock" coal is near the level of the "4-foot" bed at Gold Mine 

 and the "Dan's bed" at Rausch Gap, in which case the Pitch coal at 

 Black Spring Gap might, without too great a strain of the imagina- 

 tion, be correlated with the "2-foot" coal at Rausch Gap, and the 

 '"4-foot" coal at Black Spring might correspond to the "3-foot" coal 

 at Rausch Gap. Continuing the same assumption as to the identit}^ of 

 the horizon of Bill's bed or the Buck Mountain coal at Moiuit Eagle 

 Gap, it is evident at a glance that the Black Spring and Mount Eagle 

 coals near the top of the section at Black Spring correspond, so far as 

 stratigraphic intervals are concerned, almost exactly with the "No. 1" 

 and the '"Ileistcr" coals, respectively, in the Rausch Gap section. 

 The quoted names of coals represent the local identifications or corre- 

 lations by the State geologists. 



So far as the problems discussed in tliis report are concerned, the 



