12 BULLETIN OF THE LAHORA'I-ORIES 



als, although present to a moderate degree, do not form a marked fea- 

 ture' of the enclosed fauna. Fiovvever, this is the line in which there 

 is a considerable variety in the number of trilobites, brachiopods, and 

 bryozoa. It is especially of value, however, as containing the best 

 general collection of the fossils peculiar to the group in the best con- 

 dition for the collector's purposes. The localities in line with Reed's 

 Hill, Camp Corwin and the Huffman quarries are the worst localities 

 for collectors of specimens. However, beginning at Huffman's quarry 

 there are a few fossils at the very top of the Clinton proper, and the 

 fauna of the Beavertown marl is also shown. At Centre ville the top 

 of the Clinton proper reaches a greater variety in the fauna, and at 

 Todd's Fork, where there is a commingling of the two, the top strata 

 are quite richly fossiliferous again. The question presents itself 

 whether this distribution of the fauna can have any relation to the ele- 

 vation of the Cincinnati Arch. If so, it would be a most indubitable 

 evidence of the elevation of that arch before the beginning of the 

 Clinton Group. 



If there is so much variation in the fauna of even a quite limited 

 district it will be well to note what forms have been found most relia- 

 ble in the identification of this group, forms therefore which are char- 

 acteristic and have the widest geographical range. These are: IUce- 

 mis Daytonensis, Illmius ambigiius, Dalmaniies Werthenii, Platyostomus 

 Ntagarense (a small and constant form) Orthis flabella, Strophomena pa- 

 tejita, Phylloporina angulata, Clathropora frondosa, Ptilodictya expansa, 

 the various species of Phcenopora and Khinopora verrucosa Any local- 

 ity in this state or in Indiana, containing five of these species, could 

 safely be referred to the Clinton Group as represented in Ohio. 



