274 IDENTITY or THE WESTERN FORMATIONS 



little shell, {Orthis testudinaria?) Or! his striatvla. The latter 

 fossil ranges through the Hudson river group in New York, as 

 it does through the Caradoc sandstone of England. This asso- 

 ciation of fossils, with the peculiar aspect of the limestone, and 

 the presence of sandstone with fucoides, seehied indubitable proof 

 of the position of this mass. Neither the character of the rocks, 

 nor of the fossils, indicates the Trenton limestone to which here- 

 tofore it has been referred. Numerous other fossils, unknown in 

 New York, are found at Maysville, the most abundant being 

 several species of Orthis and DeUhijris. 



The cliffs of Cincinnati were next examined, and the same 

 evidence, in a higher degree, brought forth. At this place I had 

 the gratification to meet Dr. Locke, who gave me every informa- 

 tion relative to the limits of the two formations, Cliff and Blue 

 limestones, as known in Ohio, and I afterwards derived great 

 assistance from his Report on the Geology of this part of the State. 

 I was also fortunate in meeting, at this place, with several gen- 

 tlemen who were zealously engaged in exploring the rocks of 

 the vicinity, and who voluntarily aided me in my objects. From 

 JNIr. J. G. Anthony, Mr. Clarke, Mr. Carley, and Mr. Buchanan, I 

 received many characteristic fossils of the locality. 



The section made there at this time presented the following 

 features. 



On the Kentucky side of the river, at the water level, (May 

 8th, 1841,) the rock seen was a green shale with thin laminae of 

 crinoidal limestone, containing few fossils. Among these the 

 Triarthrus Beckii is the most prominent, and with fragments of 

 Isotelus, and a few imperfect shells, were all that I obtained. In 

 New York, the Triarihrus is never found below the Utica slate, 

 and is a characteristic fossil of that mass ; though it does occur 

 somewhat rarely in the lower part of the Hudson river group. 

 Taken in connection wilh other circumstances, and the character 

 of the fossils in the succeeding rocks, it seems a fair inference 

 that this is the equivalent of the Utica slate, or at least not far 

 above it. 



At low water, on the Ohio, a lower rock appears, and though 

 the specimens I have seen contain no unequivocally charac- 



