SECOND GEOLOGICAL SURVEY OF PENNSYLVANIA. 

 REPORT OF PROGRESS PP. 



THE FOSSIL FLORA 



OF THE 



UPPER CARBONIFEROUS OR PERMIAN 



IN 



WEST VIRGINIA 



AND 



SOUTH-WEST PENNSYLVANIA 



INTRODUCTORY CHAPTER. 



A sketch of the geology of the Carboniferous Formation in 



West Virginia. 



The different groups which iiKilude the strata of Carbon- 

 iferous age, as found in the Ai)palachian Coal Field, are 

 in some respects better defined, and more sharply separated 

 from each other in West Virginia than elsewhere. 



The names finally adopted by the former State Geologists 

 of Virginia and Pennsylvania, Prof. W. B. and H. D. Rog- 

 ers, for the grand divisions of the series, commencing with 

 the lowest, were Vespertine Sandstone, Umbnil Limestone, 

 Umbral Red Shale, Serai Conglomerate and [Productive] 



Coal Measures. 



(ipp) 



