WITH THOSE OF NEW YORK. 273 



New York. I was not so fortunate as to meet willi fossils in 

 any part of this mass examined, though they do occur in some 

 places. This rock was traced nearly to Columbus, and a short 

 distance to the west of that place the Corniferous limestone of 

 New York appears, presenting its characteristic fossils. This 

 inass is the upper part of the cliff limesone formation of Dr. 

 Locke, the name by which it is generally known in Ohio.* The 

 localities where I saw this rock exhibited less hornstone than is 

 usual in New York, but the position and fossil characters were 

 unequivocal. 



After ascertaining the existence of the Corniferous limestone, 

 and the middle and lower members of the cliff limestone, for 

 some distance west of Columbus, an offset was made into the 

 coal region of the southern counties, and the line of observation 

 again taken up on the Ohio river at Portsmouth. 



In following down the river, the limestones appear rising from 

 beneath the shales, as represented in the section. Numerous 

 localities are presented in the river bank and ravines, where the 

 blue limestone exists in gi'eat force ; the most interesting, before 

 reaching Cincinnati, are in Adams county, Ohio, and Maysville, 

 Kentucky. An examination of the fossils at Maysville, convinc- 

 ed me of the identity of the Blue limestone of Ohio, and the 

 Hudson river gi'oup, of New York. The evidences of this iden- 

 tity are the following : the mass consists of green shale, or marl, 

 alternating with courses of bluish crystalline limestone, of a 

 peculiar aspect, resembling that associated with the Clinton 

 group, of New York, particularly the portion containing Penta- 

 mervs oblong-us. Thin layers of gray sandstone occur, some- 

 times separate, and at others attached to the limestone in wedge- 

 form masses, and always containing a species of fucoid, which 

 I had learned to consider a characteristic fossil in New York. 



Further examinations brought to light the Pterinea carinata, 

 two or more species of Cypricardia, a Strophomena, Cyrtolites 

 ornatus, and the Bellerophon bilobatus, as well as the abundant 



* See Report on the Geology of the southwestern counties of Ohio, by Dr. Locke. 

 — Ohio Geological Reports. 1838. 



