838 FLOKAL ZONES OF THP: POTTSVILLE FORMATION. 



To tho latter may also ho added the following species from a eoal, 

 prohahly the Peacoek, on the west side, i. e.. the eoal mined at the 

 Molley slope, and Yoder's drift on the east side of the ga]i. and mapped 

 as Lvkens coal No. 4: 



Calamites Cistii Brongn. 

 Sigillaria camptotit'iiia Wood. 



Pecopteris ptcroidcs Bronirii. 

 Pecopteris polyniorplia Brongii. 

 Nenropteris Sclieuchzeri Hoffin. 



The shales from the second coal, nearly 390 feet al)ove the Peacock 

 coal, are filled with. Aniudaria stellata^ Pecopteris. xin'da^ and vast quan- 

 tities of Pecopteris cthorescens. The plants in the shales over the 

 individual coals of the Productive Coal Measures of the Southern 

 Anthracite field have not yet been studied systematically and from a 

 stratigraphic standpoint. No attempt will, therefore, at present be 

 made to correlate the Lower Coal Measures in Lorberry Gap l)y means 

 of fossils. 



The conglomerates in the lower part of Lorberry Gap may easily ))e 

 traced through the greater part of the distance across to Fishing Creek 

 Gap, 2i miles to the west, but owing to the subsidence of the crest in 

 a broad and rounded ridge slope the individual beds can not be traced 

 quite to the Fishing Creek Gap without the aid of a careful instru- 

 mental survey. The late State geological survey has indicated the 

 approximate outcrop of the lower coal of Lorberry Gap as gradually 

 diverging slightly from the crest l)eyondapoint 1 mile west of Lorlierry 

 Gap, and as passing just south of the little knob facing Fishing Creek 

 Gap. The boundary of the red shale was evidently thought to be 

 necessarily parallel with that of the coal, and we find it thus traced on 

 the mine sheet. 



SECTION AT FISHING CKEEK GAP. 



(Station 18, Pi.. CLXXX.) 



No detailed descrii)tion of the section in Fishing Creek Gap appears 

 to have l)een put)lished. The geographic position of the three coals 

 opened toward the lower end of the gap is shown in mine sheet xxi. 

 Atlas Southern Anthracite Field. Pt. III. 



In this map the lower coal is correlated with the lower coal (South) 

 mined at Lorberry Gap. and the approximate outcrop of this supposed 

 Lykens coal No. (S is traced between the drifts in the two gaps. The 

 upper coal (Peacock) is likewise mapped as Lykens No. 4. just as in 

 the eastern gap. The relations of these lower coals to th(» outcrop- 

 pini:- sandstones in Fishing Creek Gap are shown in the section. PI. 

 CLXXNN'l. Fig. 1. the position of the red shale being recorded as it 

 appears, immediately on the east side of the gap, which, indeed, the 

 section re])re.sents. the upi)er coal being projected from the Avest side. 

 It will be ot)S('rved from both tiie topography, which is low on the east, 

 and from the (•(•lunmar section, that the conglomerates are neither 



