﻿1 8 Bulletin 17 26 



Summary. 



This paper is intended to show the following points. 



In regard to the Trenton Falls section : 



First. That though most of the common species range through 

 the whole mass, as White has remarked, yet there is such a 

 variation in the relative abundance of these species in the various 

 zones as to make up faunules which can be easily recognized. 



Second. That at least two species, Platy strophia lynx and 

 Rafinesquina deltoidea, have limits to the range in which they are 

 common. 



Third. That the upper third of the mass contains the greatest 

 number of individuals, but about the same number of species as 

 the lower part. 



Fourth. That the brachiopods and trilobites form the most 

 important part of the fauna. The pelecypods are rare except 

 locally. 



In regard to the Newport section : 



Fifth. That when the " Birdseye " is fossiliferous its fossils are 

 practically the same as the Black River, or, that these two 

 faunules are more closely related to each other than either is to 

 the Trenton above. 



Sixth. That in these lower faunules, the pelecypods are as 

 important in individuals and species as the brachiopods. 



Seventh. That the Black River has a fauna which would enable 

 one to recognize it even if Columnaria alveolata were absent. 



Eighth. That the fauna of the Black River in this localit}' 

 is very closely related to the Black River of the Champlain 

 province. 



