A PRELIMINARY LIST OF THE FAUNA OF THE 



ALLEGHENY AND CONEMAUGH SERIES IN 



WESTERN PENNSYLVANIA. 



By Percy E. Raymond. 



Allegheny Series, Vanport Limestone. 

 In the Allegheny series there is, so far as is now known, only one horizon 

 at which marine fossils may be obtained. The Vanport is usually a 

 limestone, although in places it is replaced by a fossiliferous shale. The 

 thickness varies from i to 25 feet and the base is usually about 250 feet 

 below the top of the Allegheny series. This limestone is very persistent 

 west of the Chestnut Ridge and north of the latitude of Pittsburgh. 

 Fossils are abundant at nearly all exposures but good specimens can be 

 obtained only where there are shaly layers. Collections have been made 

 at Rochester, Beaver Falls, Wampum, New Castle, Kittanning, and 

 Roaring Run, and the commoner species are listed in the accompanying 

 table. 



While there has not yet been enough collecting done to determine ac- 

 curately the range of the various species in the Pennsylvanian, it is 

 probable that the commoner species have been noted. So far the following 

 common species have not been seen at any horizon higher than the 

 Vanport : 



FiisuUnella sp., Astartella varica, 



Cyathaxonia distorta, Pleurotomaria spironema, 



Campophylliim torqiiiiim, Euconispira bicarinata, 



Chonetcs mesolohus, Naticopsis torta, 



Productus nanus, Naticopsis altonensis, 



Spirijer rockymontaniis, Strophostylus remex, 



Squamnlaria perplexa, Porcellia peoriensis, 



Dielasma bovidens, Trachydomia wheeleri. 



Composita girtyi, 



Of these species, Spirijer rockymontaniis, Chonetes mesolobiis, and Squam- 

 nlaria perplexa are known to occur in the Mercer limestones of western 

 Pennsylvania, so they can not be called strictly characteristic of the 

 Vanport. Just what species are restricted to the Vanport will not be 

 known until the fauna of the limestones in the Pottsville is further studied^ 



144 



