FRANKLIN COUNTY. 619 



widely removed places, while others are peculiar to the locality in which 

 they are found. Some fossils are abundant through the whole extent of 

 the formation, even entering it from seas of an earlier age. Others are 

 equally abundant in the one limited horizon which they occupy. Through 

 a foot or two of the limestone they are everywhere shown, but no frag- 

 ment or trace is found above or below. 



As in all other assemblages of fossils, many species are established on 

 a very few specimens — oftentimes on but a single one. The wealth of 

 the formation in this department is not yet appreciated in any adequate 

 degree. When the same measure of interest and labor has been given to 

 it that has been spent in the Cincinnati formation, for example, its list 

 of species will be several times greater than it now is. 



One strong hold upon our interest this formation possesses, in the fact that 

 it contains the earliest undisputed remains oiland vegetation and vertebrated 

 animals that are found in the rocks of the continent. Its tree ferns and its 

 fishes are altogether new types in the world. Special interest is drawn to 

 these earlier forms on account of their bearing on questions of derivation. 



A catalogue of fossils described from this formation, is here appended. 

 No name is introduced except upon the authority ot the paleontologists 

 of the survey— F. B. Meek, Esq., and Profs. R. P. Whitfield and H. A. 

 Nicholson.' A large number of the species are represented in the collec- 

 tion of the Ohio Agricultural and Mechanical College. To the lists are 

 added the generic names of a few well-marked, but undescribed forms, 

 which have been recognized as distinct species by the authorities named 

 above 



CATALOGUE OP THE DESCRIBED FOSSILS OF THE CORNIFER- 

 OUS LIMESTONE OP OHIO. 



PLANTS. 



Fdcoids abundant on surfaces of upper beds at State quarries, Columbus. 

 Spirophyton — cauda galli f 



Genws Cattloptekis. 



(Tree ferns.) 

 Caulopteris antiqua, Newberry. 

 C. peregrina. Newberry. 



Genus Lepidodendron. 



CClub mosses.) 

 Lepidodendron, Gaspianumf Dawson. 



Genus Dadoxylon. 



(Ancient pines.) 

 Dadomjlon Newierryi, Dawson. 



