WHITE.] LYKENS COALS IN STONY MOUNTAIN. 855 



No. G; the thick bed, 40 or 50 feet higher, maj^ then be the Lykens 

 coal No. 5, and the 2-foot 7-inch bed of good coal 100 feet above the 

 last will perhaps correspond to the place of L3'kens coal No. 4, while 

 the coal about 150 feet higher is possibl}^ near Lykens coal No. 2 or 

 No. 3. As corroborating to a certain degree, or as slightly indicative 

 of the correctness of, these hypothetical correlations, the small col- 

 lection of plants apparent!}' derived from the roof of the third coal 

 (numbering from the lowest), which we have assumed to be L3'kens 

 coal No. 4, may be enumerated: 



jNIariopteris pottsvillea. I Asterophyilites parvulus. 



NeuiMpteris Pdcahoiitas. | Trigonocarpum ampullaeforme. 



The tirst of these species seems to be characteristic of the zone of 

 that coal, while the third is more common in the same horizon. On 

 the whole, it appears very probable that the three principal lower 

 Lykens coals have been opened in the prospect shafts on the Dull and 

 Hofi" lands. 



At a point nearly north of Rausch Gap^ two coals, which from sur- 

 face appearances and the thickness of the intervals would seem to rep- 

 resent the supposed Lykens coals Nos. 4 and 5 at the locality last 

 considered, have been opened by trial slopes (Station 22, PI. CLXXX). 

 The coal at the mouth of the upper of the two slopes is apparently of 

 good qualit}' and in good condition. No information is at hand as to 

 the thickness of the Ijeds in the slopes, which are now fallen shut. The 

 lack of information is in itself indirectly indicative of no great thick- 

 ness for the combustible. 



At the Kalmia colliery (Station 41, PI. CLXXX) Lykens coals Nos. 4, 

 5, and were worked to some extent. Owing, however, both to the 

 irregularity of the beds at this point in thiclvuess and condition and to 

 the more advantageous conditions for mining about the Georges Head 

 anticline, the greater part of the ''workings*' were aliandoned in favor 

 of the latter area. The columnar section at this mine from the top 

 of Lvkens coal No. 5 downward into the red shale is shown on PI. 

 CLXXXiy in continuation with the section at the Lincoln collier}", 

 from the connected gangways' of which a portion of the Kalmia ter- 

 ritory is now directly mined. 



GENERAL CONDITIONS RELATING TO THE OCCURRENCE OF THE 

 LYKENS COALS IN THE DAUPHIN BASIN. 



A review of the foregoing l)rief descriptive notes concerning the 

 Pottsville formation in the Dauphin Basin shows that along the north 

 side of the narrow trough, which is nowhere more than 2 miles in 

 width, ^ several of the Lykens coals, one or more of which, usually in 



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



2 Idem, rt. III. mine sheets xxi and xxii. 



*This refers to the distance across the basin from margin to luarKin; not to the length of the iiirve. 



