CORKELATIONS IN THE SOUTHERN FIELD. 



805 



The other coal, about TO feet higher, opened on the west side, has 

 furnished fragments representing — 



Neuropteris Pocahontas var. pentias ? 

 Neuropteris Pocahontas var. insequahs. 

 Calaniites Eoemeri. 



Trigonocarpum ampullseforme. 

 Trigonocarpum Helente ? 



Neither of these florulas is sufficient!}^ complete to form the basis 

 for definite correlation. Nevertheless, not onh- is it clear that both 

 belong to the Lower Lykens division of the Pottsville formation, ])ut 

 it is also highly probable, from the absence of species characteristic of 

 Lykens coal No. 4, as well as from the presence of Mariopteris erern- 

 opten'oides^ and, probabh% of Neuropteris Pocahontas var. pentias^ that 

 we have here to do with Lykens coal No. 5, or a still lower coal. As 

 already stated in the discussion of the floral characters of the horizon 

 of Lykens coal No. 6, owing, perhaps, to the scantiness of material in 

 the collections, no delinite paleontologic distinctions can yet be drawn 

 between it and coal No. 5. Taking into account the agreement of the 

 florulas with Lykens coals Nos. 5 and 6. as well as the interval between 

 the beds, it seems probable that the coal opened on the west side, which 

 was mapped by the State geologists as Lykens coal No. 6, and corre- 

 lated by them with the lower bed in the Swatara Gap, is really Lykens 

 coal No. o, in which case we ma^^ assume that the other, lower coal 

 drifted on the east side of the gap represents the Lykens coal No. 6. 



The interval between the coals, about TO feet, as well as the general 

 distances of the latter from the "Buck ^Mountain" coal, corresponds 

 well with the stratigraphic relations of Lykens coals Nos. 5 and 6 at 

 the Lincoln mine, about 3 miles to the northwest. 



Though few in number, the plants in the Rausch Gap, which are 

 distinctly characteristic of the Lower L^'kens division, are especially 

 interesting as compared with those from coals that have hitherto been 

 supposed to be of the same age in Lorberry Gap, a mile to the west. 

 The latter will later be especialh' treated in connection with the 

 Dauphin Basin. 



3. Coal shaft northeast of the yorth Bhxjkslde slope. At a distance 

 of a little more than 200 3"ards northeast of the North Brookside slope 

 on Lykens coal No. 2 (Station T, PI. CLXXX), a trial shaft was, several 

 years since, sunk on a coal which has l)een supposed ])y the local 

 engineers to be the Lykens coal No. 4, though the isolated position of 

 the proving, on the north side of the Wiconisco Basin, opposite Good 

 Spring,^ left some doubt as to the accurac}' of the correlation. The 

 presence of ^[ariopteris pottsr'dlea., ^^phenopteris p>atentissiina^ Neurop- 

 teHs Pocahontas var. huepialh, and Xeuropteris Sniitltsii in the flora 

 from the roof of the coal points clearly to its contemporaneity with 

 the Lvkens coal No. -i. 



1 Atlas Southern Anthracite Field, Pt. Ill, mine sheet xvii. 



