FLORA OF THE CLARION GROUP 149 



region being badly macerated and abraded. Nevertheless, specimens 

 have been collected from the roof of the Brookville coal, which usually 

 occurs within a few feet of or almost on the top of the Pottsville forma- 

 tion, at Port Barnett, near Brookville (Br.), and from the roof shales of 

 the Clarion coal at Somerville (Som.), near the Clarion county line. 

 Fossil plants occur in this group in Butler and Mercer counties, where 

 they have been collected at Grove City (G. C), Pardoe (Par.), and Filer 

 (Fil.), from above the " Pardoe " coal. This coal is regarded by Doctor 

 I. C. White as equivalent to the Brookville coal, though it is thought 

 that it possibly represents the Clarion coal. Its reference to the Clarion 

 group is, however, certain. 



Plants of the Clarion group. — For the sake of economy of space, the 

 species collected from the relatively small stratigraphic interval in- 

 cluded in the Clarion group may be combined in one list, from which 

 the plants of each horizon may be separated by referring to the abbre- 

 viations given above. The identifications are the result of a preliminary 

 study and are, as such, subject to revision. 



Name. Locality. 



Mariopteris cf. aspera Brongn Fil. 



Pecopteris villosa Brongn.* Fil. , Som. 



cf. vestita Lx.* Br. 



Alethopteris serlii (Brongn.) Goepp G. C. 



Neuropteris desorii Lx.* Fil. 



rarinervis Bunby * G. C. , Par. 



ovata Hoffm.* Br., Fil., G. C, Som. 



vermicularis Lx.* Som. 



" scheuchzeri Hoffm.* Br., Fil., G. C, Som. 



Caulopteris sp Fil. 



Annularia stellata (Schloth.) Wood * Fil. 



sphenophylloides (Zenk.) Gutb.* Par. 



Sphenophyllum emarginatum Brongn.*. Br. 



Lycopodites meekii Lx Par. 



Lepidodendron dichotomum Sternb Fil. 



cf. andrewsi Lx.* Par. 



clypeatum Lx Fil. 



Lepidoslrobus geinitzii Schimp.* Fil. 



Lepidophyllum lanceolatum L. & H.* Par., Som. 



Polysporia sp Fil. 



Sigillaria cf. brardii Brongn Fil. 



(Rhytidolepis) sp Fil. 



Cordaites lacoei Lx. ? * Fil. 



Cardiocarpon sp Fil. , G. C. 



Rliabdocarpos multistriatus (Sternb.) Lx.* Fil. 



The species in the above list comprise a flora representative of the 

 lower portion of the Allegheny series. The forms marked by the aster- 



