﻿25 Range of Trenton Species 17 



In the piles of waste material in the quarry many fine speci- 

 mens can be found, and the following species, not seen in No. 13, 

 were collected from blocks of undoubted Black River limestone : 



Columnaria alveolata, - Orthoceras arcuoliratum, 



Camare/ta, sp. und., Fusispira subfusiformis, 

 Cuneamya subtruncata, Bathyurus spiniger, 



Whitella ventricosa, Harpina, sp. nov. 



"Lituites americanus \ 



Conclusion. 



Of the twenty-one species found in the Birdseye, three only, 

 Trochonema umbilicatum, Oncoceras constrictum, and Orthoceras 

 multicameratum, were not found in the immediately succeeding 

 beds. Eleven of the twenty-one occur in the Trenton at Trenton 

 Falls. 



It is interesting to note that although the Calciferous and Birds- 

 eye here grade into one another so that, as Prosser and Cutnings 

 remark, it is difficult to draw any sharp line between them on 

 lithological grounds, yet there is so great a change in conditions 

 between the two that none of the species of the Upper Calciferous 

 (Fort Hunter*) fauna pass into the lowest Trenton. 



There is a marked similarity between this Black River fauna 

 and that of the same formation at Crown Point, N. Y.f Of the 

 forty-one species identified from zone 13, twenty-eight are found 

 in the Crown Point fauna. Of the remaining species twelve are 

 are rare and one, Bumastus trentonensis, is common. In the 

 Crown Point fauna there are only nine species which do not occur 

 at Newport. Four of these are rare, and five, Plectorthis plica- 

 tella, Streptelasma corniculam, Dalmanella subceqtiata pervetus, 

 Stromatocerium rugosum and Triplecia ex tans are common. 

 Strepte/asma cornicukini and Stromatocerium rugosum are common 

 in the Black River of other sections in the Mohawk Valley and 

 should be found here. 



*See Bull. Am. Pal. No. 13. 



fSee Bull. Am. Pal. No. 14, pp. 21-24 and 30. 



