WILMAMS.] 



THE NEW YORK CLASSIFICATIONS. 



57 



CLASSIFICATION BY JAMES HALL.' 1843. 



[Final Report, Fourth District, pp. 18, 19. J 



Tabular view of rocks and groups of New York. 



I. Primary or ITypogeue system. 

 II. Tacouic system. 



Cliamplain division . . 



Ontario division . 



III. New York system < 



Helderberg series.. 



Potsdam sandstone. 



Calciferous sandrock. 



Black River limestone group, 

 embracing the Chazy and 

 Birdseye. 



Trenton limestone. 



Utica slate. 



Hudson River group. 



Gray sandstone. 



Oneida or Shawangunk Con- 

 glomerate. 



Medina sandstone. 



Clinton group. 



Niagara group, including 

 sbale and limestone. 



Onondaga salt group. 



Water-lime group. 



Pentamerus limestone. 



Delthyris sbaly limestone. 



Encrinal limestone. 



Upper PentameriiH limestone. 



Oriskany sandstone. 



Cauda-Galli grit. 



Scbobarie grit. 



Onondaga limestone. 



Corniferous limestone. 



Marcellus sbale. 



Hamilton group. (Moscow 

 sbalcs, Encrinal limestone, 

 Ludlowville sbales.) 



Tully limestone. 



Genesee slate. 



Portage or Nunda group. 



(Portage sandstone, Gardeau 

 flagstone, Casbaqua slate.) 

 1^28. Cbemung group. 

 IV. Old Red system, or Old Red sandstone. 

 V. Carboniferous system. 

 VI. New Red sandstone. 

 VII. Tertiary. 

 VIII. Quaternary system. 



RESUME" OF CLASSIFICATIONS. 



Cbaraplain group .. .Emmons and Hall agree in terminating it witb tbe Oneida Con- 

 glomerate. 



Vanuxem and Mather terminate it with the Hudson River group. 

 Ontario group Emmons, Medina to Water-lime, inclusive. 



Hall, Medina to Niagara, inclusive. 



Mather, Oneida Conglomerate alone. 



Vanuxem, Oneida to Niagara (but order wrong). 

 Helderberg series... .Emmons, Pentamerus limestone to Helderberg limestone. 



Hall, Onondaga salt group through Corniferous limestone. 



Vanuxem, Onondaga to Corniferous. 



Mather, Onondaga to Corniferous. 

 Erie division Marcellus to Chemung, inclusive, by all. 



Erie division ., 



25 



•According to this author the formations 1, 2, 3, 4 were correlated with the "Cambrian system" of 

 Sedgwick, the Potsdam (1) doubtfully included. "Silurian system" Murchiaon— Utica slate (5) to 

 Hamilton (24). "Devonian System" of Phillips=Chemung and Portage and part of the Hamilton 

 (24 to 28). (See p. 20.) 



