DEVONIC FISHES OF THE NEW YORK FORMATIONS 9 



out to the classification of the New York series adopted by the geologists 

 of this State,' and to Prosser's classification of the Ohio Devonic.^ 



In the latter system it will be noted that the local names of " Columbus " 

 and '"Delaware limestones" are used for the lower Mesodevonic rocks 

 instead of Onondaga (= Corniferous) of the New York classification, for 

 the reason that it is probable these Ohio formations should be correlated 

 with a later horizon than the Onondaga — namely, the lower part of the 

 Erian series of New York. We may also remark in this connection that 

 the weight of evidence furnished by fossil vertebrates is decidedly in favor 

 of grouping the formation "Corniferous" of older geologists together with 

 the Hamilton in a single division of the Mesodevonic. For the conven- 

 ience of those who may not be perfectly familiar with the relations of the 

 different systems, the following tables may be here inserted : 



' Science, Dec. 8, 1899; American Geologist, Feb. 1900; N Y. State Mus. Mem. 3. 

 1900; Univ. State N. Y. Handbook 19. 1903; N. Y. State Mus. Bui. 81, 82. 1905; 99. 1906; 

 107. 1907.- 



* Nomenclature of the Ohio Geological Formations. Jour. Geol. 1903. 11: 519-46. 



