808 FLORAL ZONES OF THE POTTSVILLE FORMATION. 



in section 23. cross-section sheet xviii. Atlas. Pt. \\. republished on a 

 small scale, with a brief description, in the Sunniiary Final Report of 

 the late State geological survey.' From the rot-k dump at the mine, 

 which has for uany years been operated for country use. the following 

 species were codected : 



Whittleseya Campbell!. 

 Cardiocarpf)n di?ciilnni. 

 Cardiocarpou ol)li(]Uuiii. 

 Trigonocarpum aiiipulheforme. 

 Trigonocarpuiii ainpulLcfDrnie var. s2-)ec- 



taVjile. 

 Trigonocarpum Helena'. 

 Trigonocarpum Dawgonianum. 

 Carpolithes orizreformi?;. 



^lariopteris pottsvillea. 

 Sl)henopteris Lutheriana. 

 Alethopteri:* grandifolia. 

 Neuropteris Pocahontas var. in;equalis. 

 Xeuropteriis gigantea var. c-lavata. 

 Caiamites Roemeri. 

 Asterophyllites cf. rigidus. 

 Calamostachys cf. lanceolata. 

 Si>iienophyllum tenue. 

 Whittleseya Lescuriana. 



By far the greater portion of the above names are familiar in the 

 di.scu.ssions of the floras of the Lower Lykens division. Nearly all 

 the species occur in the shales of that group, while in Marioptens 

 potiKviUea^ Sphenoptrrk Lutheriana, and ^phenophylhim temiev^Q seem 

 to have species specially characteristic of Lykens coal No. -i, of which 

 NeuTOpteris Pocahontas var. incequalis and Trigonocaipum Helenas also 

 are largely typical. In fact, in view of the general agreement of the 

 flora as a whole with that of Lykens coal No. 4. and of the presence 

 of several of the species supposed to be typical of that horizon, 

 we may consider the palcontologie evidence as pointing very strongly 

 toward the assignment of the coal at the Kemble drift to an approxi- 

 mate level. As tending, however, to impair the strength of the evi- 

 dence of these fossils, mention should be made of certain minor diflfer- 

 ences in the forms of the species. Thus the form of Marlopt&rk jMts- 

 villea present at this mine is a rather lax type with somewhat dilated 

 pinnules, while the form of Xeurop>terts Pocahontas var. iniequalis is ))oth 

 elongated and robust. Furthermore, Alethopteris grandifolia, Whit- 

 tleseya Lescuriana, and Cardiocarpon disculurn. appear in other portions 

 of the basin to Ije confined to the zone of Lykens coals Nos. 2 and 3, 

 while AsU^rophyUitt's cf. rigidus is more at home in the upper divi- 

 sion of the Pottsville formation. In view of the presence of these 

 elements of generally later age. we may. I l)elieve, safely conclude 

 that the coal mined at the Kemble drift, which is mai)ped by the State 

 geologists as Lykens No. 5,' can not be any older than Lykens 

 coal No. 4. In the Summary Final Report,^ the correlation of this 

 coal, w'hich is there described as "clo-sely overlain" by coal No. 4, 4 

 feet thick, is expres.sed as uncertain. It seems possible that the 

 low^er coal is a new one occurring near Lykens coal No. 4, if it 



1 Vol. in, I't. I, p. 2n9, pi. 3M. 



= AUas Southern Aiithnu'ite Field, Pt. H. miin- slu*et xiii. 



3 Vol. HI. Pt. I. p. 2n9. 



