848 FLORAL ZONES OF THE POTTSVILLE FORMATION. 



chief interest in tluM-orrelatioii of the coals of the Lower Coal Measures 

 relates to th(^ e(iuivalence. in the western sections, of the coals mined in 

 the Fishino- Creek and L()r])err3' gaps. My own observations of the 

 terranes in the Pishing C^reek ^Gap (PI. CLXXXVI, Fig. 1), com- 

 bined with measurements across Sharp Mountain, less than a mile 

 west of the creek, where the Pottsville formation is present in its 

 normal eoMstitution and thickness, lead me to the opinion that the 

 horizons of the two lower coals mined in Fishing Creek Gap are 

 comparable to those of the "Peacock" coal in the Black Spring and 

 Gold Mine sections and the coal marked as " Heister " in the Rausch Gap 

 section. In this case the upper coal at Fishing Creek ma}' represent 

 the "Gray bed"' at Rausch Creek Gap, the second coal al)ove the sup- 

 posed "Peacock" in Gold Mine Gap, and probably the Black Spring- 

 coal at Black Spring Gap, the lowest coal at Fishing Creek being 

 possibly comparal)le to the Pitch bed at Black Spring. 



Tlu> coals in the section at Lorberry Gap, PI. CLXXXV, Fig. 3, will 

 appear to correspond most satisfactorily, with respect to the separating 

 inter\'als, to the coals of the gaps to the westward, if we assume that the 

 lowest bed (South coal) opened at Lorbej'ry occupies the horizon of the 

 snpposed Buck Mountain, Backbone, and Bill's beds in the other gaps. 

 If this hypothesis is correct, the })ed designated "Peacock" coal in Lor- 

 berry, Black Spring, and Gold Mine gaps, which, in the first two sec- 

 tions, is approximately the same distance from the Buck Mountain 

 bed, and which is scarcely farther in the Gold Mine Gap, may per- 

 haps safely be considered as one coal. Next, the ' ' Zimmerman " coal in 

 Lorberry Gap would appear to deserve comparison with the Mount 

 Eagle bed at Bhick Spring, with the second exposed coal above the 

 " Peacock" })ed in Gold Mine Gap, and with either the "Gray" bed or 

 "No. 2" bed. next higher, in Rausch Gap. 



On assuming that the South coal at Lorberry is at the horizon of the 

 I)Utk Mountain (Twin) bed, it becomes probable that the developed 

 coal> above the '•Zimmerman " bed are higher than those represented in 

 the Rausch Gap section, ludess the "No. 4" bed in the latter section, 

 whose distance above the Buck Mountain bed is a little greater than the 

 corresponding interval below the next coaP above the "Zinnuerman" 

 in the Lorberry (iap, is the representative of the latter unnamed coal. 

 The next higher coals in the Lorberry section will then deserve compar- 

 ison with the " Heister" and " Gray" beds in the Gold Mine Gap section. 

 The rm])ehauer and the Furnace beds at the north end of Lorberry 

 Gap probably represent higher horizons than have l)een developed 

 to the westward, and it is possible that they may not ev(Mi b(> ]iresent 

 ill the hasin at and to the westward of Rausch Gaj). 



It will be observed that in respect to the relative intervals Ix'tween 



1 This appt-arsto Ix? identical with the bc-fl iiaineil Peacock coal in cros-s-sectioii sheet xvi, I't. VI of 

 tlie Athis of the Southern Anthracite Field. 



