DEVONIC FISHES OF THE NEW YORK FORMATIONS 



Classification of the New York Devonic according to James D. Dana 



DESCENDING ORDER 



Upper Devonian . . Chemun 

 Middle Devonian . . 



f Corniferous 



f Chemung 

 [ Portage 



TT M Hamilton, Tullv 



iriamilton J -.^ ,, •' 



( Marcellus 



I Corniferous, Schoharie, 

 I Cauda Galli 



Lower Devonian .,"1 



I Oriskany Oriskany 



Classification of the Ohio Devonic according to Charles S. Prosser 





Neodevonic. . . . 



Southern and Central Ohio 

 . . - Ohio shale 



Northern Ohio 



[ Cleveland shale 

 < Chagrin formation 

 ( Huron shale 







> 



Q 



Mesodevonic. . . 



I Olentangy shale 

 . .-< Delaware limestone 

 ( Columbus (including ' 



Sandusky") limestone 





Paleodevonic. . . 



. . Wanting 



Wanting 



The definitions that are given of species and genera are based largely 

 upon the writer's investigation of actual specimens, often including the 

 original types, although due account has been taken of the diagnoses of 

 earlier authors. Most of the definitions of higher groups are adopted with 

 but little modification from the special literature. For the loan of speci- 



