834 



FLORAL ZONES oK THE POTTSVILLE FORMATION. 



The section ut L()i'l)eiTv (iiip is ilesi-ritx'd by Kouer.s and tiie geolo- 

 gists of the second State survey, on whose mine sheets (xvi and xxi) 

 the coals have ostensibly biHMi traced from Rausch Gap westward. 

 The cross section is given in cross-section sheet xvi, Pt. VI of the 

 Southern Anthracite Field Atlas. These mine sheets are valuable as 

 showing tlie |)osition and extent of the mine workings, and the dip as 

 Avell as the tlirection of the strike of the coals. The topographic 

 f(>:itur("s of the district are shown on the Pin(> drove sheet. Topo- 

 graphic Atlas of the United States. 



Great was my surprise when, on inspecting a collection of plants 

 from the roof shales of the southernmost coal opened in the gap— the 

 bed mapped as Lykens coal No. 6, and apparently lying in the position 

 of that coal with reference to the top of the red shale — I discovered 

 the presence of a .distinctively and unmistaka])ly l^roductive Coal 

 Measures flora, comprising species as follows: 



Neuropteris verinicnlaris Lx. 

 Neurojateris limbriata Lx. 

 Neuropteris Clarksoni Lx. 



Mariopteris muricata (Schloth.) Zeill. 



var. nervosa (Brongn.) Kid.st. 

 Pseudopecopteris squamosa (Lx.) . 

 Sphenopteris .susiK'cta D. W.? 

 Pecopteris aspidioides Sternb. 

 Pecopteris unita Brongn. 

 Pecopteris oreoptcridia (Schloth.) Pternl). 

 Pecopteris ^liUoni Artis? 

 Alethopteris pennsybanira Lx.? 

 Neuropteris ovata llofl'in. 



Search was then made in the shales accompanying the next higher 

 coal, mapped as Lykens coal No. 4. mined both at Molley's slope, 

 within the south end of the gap. and at Yoder's drift. The plants 

 obtained at the slope are : 



Neuropteris Scheuchzeri Hoffni. 

 SphenophyUum emarginatum Brongn. 

 Lepidodendron diehotonium Sternb. 

 Lepidophylhnn o))longifoUuni Lx. 

 Rhabdocari30s nuiltistriatus (Presl) Lx. 

 Rhabdocarpos jacksonensis Lx.? 



Neuropteris ovata HdITih. 

 Neuropteris Scheuchzeri Hoffiu. 

 AsterophyUites equisetiforinis (Schloth. 



Brongn. 

 Sphenophylhnn emarginatum Brongn. 



Mariopteris cf. cordato-ovatu (Weiss). 

 Pec(Ji)teris emarginata (Joepp. 

 Pecopteris jjolymorpha Brongn. 

 Aletliopteris pennsylvanica Lx.? 

 Callij)teridium (irandini (Brongn.) Lx.? 



'i'bosc gathered at Voder's drift include: 



I'ecopteris emarginata (ioepp. Annularia ramosa Weiss. 



Pecoi)teris unita Brongn. 

 Pecopteris lepidorhachis Brongn.? 

 Pecopteris polymori)ha Brongn. 

 Alethopteris iH-misyivanica Lx.? 

 Neuropteris ovata Hoffm. 

 Neuropteris Scheuclizcri lloffm. 

 Asteroi>hyllites ('(|ui.>;ctiforiins (Schloth.) 

 ]'>roiiL'n. 



Aniudaria stellata (Schlotli.) Wood. 

 Sphenophyllum emarginatum Brongn. 

 Lepidodendron cf. dichotomum Sterid). 

 Lepidostrobus cf. vaiiahilis I,. i*< II. 

 Lepidoi)hyllum hastatum l,\..' 

 Lepidocystis vesicularis Lx. 

 Sigiliaria cauiptotaMna W.jod. 

 Sigillaria ef. alternans Sternb. 



The llora of tbis coal indicates a still highei- horizon in Ihe Goal 

 Measure>. To this evidence may t)e added that of the fossils from the 

 mine dum)) at the soutli end of the gap, though the latter are less 



