72 Review of the New York Geological Reports. 
From the preceding comparison of fossils in the east and west; 
we discover that the rocks immediately below the black slate in 
the vicinity of the Falls of the Ohio, contain not only Onondaga 
limestone and corniferous fossils, but likewise some Hamilton fos- 
sils. ‘The latter fact rather favors the idea of our black slate be- 
ing the equivalent of the Genesee slate. The position of our 
Goneatites rather confirms the same. It is true those found are 
not identified with New York species; but the first appearance 
therefore, does not help us out of the difficulty. A specimen of 
pple oe em ae of the Hamilton group in the west. 
_ Inthe northwest the | of Red Cedar and Wapsinonox 
is probably its equivalent.* ; 
The fossiliferous shales of the preceding group terminate ab- 
thin seams of shale interposed which separate the calcareous part 
into wedge-form irregular lamine. This is the most southern 
* See Report [Senate] of a Geological Ex loration of at 
and Mlinoiss ligeae he 33. Pe ploration of part of Iowa, Wisconsin, 
