SECOND GEOLOGICAL SURVEY OF PENNSYLVANIA. 

 REPORT OF PROGRESS PP. 



THE FOSSIL FLOEA 



UPPEE CAEBOlSriFEEOUS OE PEE^nAJST 



WEST VIRGINIA 



SOUTH-WEST PENNSYLVANIA, 



INTRODUCTORY CHAPTER. 



A sketcli of the geology of the Carboniferous Formation in 

 West Virginia. 



The different groups which include the strata of Carbon- 

 iferous age, as found in the Aj^palachian Coal Field, are 

 in some respects better delined, 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, Umbral Limestone, 

 Umbral Red Shale, Serai Conglomerate and [Productive] 



Coal Measures. 



(ipp) 



