WEST VIRGINIA GEOLOGICAL SURVEY. 625 



were identified. Little can be said of the character of the 

 fauna, except that an equal number of brachiopod and pelec 

 pod species, and no other orders, appear, which is well in har- 

 mony with the general character of this fauna as observed 

 elsewhere by the writer. No unusual or rare species were 

 found in it. As stated above, it appears that these shells were 

 drifted into this locality, possibly after the organisms were 

 dead, and the habitat of the animals was probably not in the 

 area of the report, though not far distant. 



Brush Creek Limestone. A smaller number of brachio- 

 pod species than in the Ames, with Chonetes verneuilanus com- 

 mon and restricted to it, Chonetes granulifer also common and 

 on the average below 10 mm. in length of hinge, though speci- 

 mens up to 15 mm. are known, with a few rare pelecypoda, 

 and especially the group of Pleurophorus species, Bulimorpha 

 nitidula, and apparently several other species of rare gastro- 

 poda serve to make a fairly distinct fauna. Also the absence 

 of Ames species, such as Ambocoelia planiconvexa, and the 

 absence of the greenish limestone beds or nodules, separate 

 it from the Ames. A distinct feature of the Brush Creek is 

 its propensity to be a water-bearing stratum, or at least its 

 susceptibility to leaching wherever the shells are abundant. 

 This makes collecting difficult and tedious and the specimens 

 obtainable are frequently only casts. 



Kanawha Group (Pottsville Series). 



Kanawha Black Flint. From the Conemaugh faunas this 

 assemblage of species differs more markedly than do the for- 

 mer among themselves. Of some 23 species collected from 

 this horizon, one-third are restricted to it. Thirteen species 

 are restricted to the Conemaugh in the area of the report. 

 Of these restricted lots, the following Black Flint species are 

 especially characteristic of the Kanawha Group : Spirifer boonen- 

 sisf, Orbiculoidea capuliformis, Parallelodon sangamonensis, 

 Pleurotomaria carbonariaf. Chonetes variolatus differs so slightly 

 from C. granulifer that I am inclined to regard it as merely a 

 not too clearly defined variety of the latter. Derbya robusta is 

 'somewhat more abundant than in the Conemaugh, especially in 

 comparison with the Brush Creek. 



