84 THE DEVONIAN AND CARBONIFEROUS. [bull. 80. 



Prof. Kogers's system of classification and nomenclature is exhibited 

 in the following synopsis: 1 



A SYNOPSIS OF THE APPALACHIAN PALKOZOIC STRATA OP PENNSYLVANIA IN THE 



ASCENDING ORDER. 



Primal crystalline schists (or Azoic group). 



Primal aeries: 



Feet. 



Primal Conglomerate in Virginia and Tennessee 150 



Primal older slate in Virginia 1,200 



Primal White sandstone, Potsdam sandstone of New York ? 300 



Primal upper slate ?700 



Auroral series (blue limestone of the Western States) : 



Auroral Calcareous sandstone, Calciferous sandstone of New York 60 



Auroral Magnesian limestone, the Chazy and Black River limestones in 



part 2,500-5,000 



Matinal series : 



Matinal argillaceous limestone, Treuton limestone of New York 300-550 



Matinal Black slate, Utica slate of New York 300-400 



Matinal shales, Hudson River slate ? 1, 200 



Levant series : 



Levant gray sandstone, Oneida Conglomerate of New York 250-400 



Levant Red sandstone, division I, or lowest member of Medina sandstone 



of New York 500-700 



Levant White sandstone, apparently divisions II, III, IV, Medina sand- 

 stone of New York 450 



Surgent series : 



Surgent lower slate, ? equivalent of lower green shale of Clinton group 



of New York 200 



Surgent irou sandstone 80 



Surgent upper slate 250 



Surgent lower ore shales, ? in horizon of upper green shales, Clinton 



group 760 



Surgent ore sandstone 10-30 



Surgent upper ore shales, ? in horizon of upper green shales, etc 300 



Surgent red marl, Clinton group 350 



Scalent series : 



Scalent variegated marls ) f 0nond 8alfc of New Yor k 5 *£ 



Scalent gray marls S \ 800 



Scalent limestone, Water-lime group of New York 250 



Pre-Meridian series : 



Pre-Meridian limestone/Lower Helderberg limestone of New York 50-100 



Meridian series : 



Meridian slate 170 



Meridian sandstone, Oriskany sandstone of New York 150 



Post-Meridian series : 



Post-Meridian grits, Cauda-Galli and Schoharie grits of New York (New 



Jersey) 300 



Post-Meridian limestone, Upper Helderberg or Corniferous limestone of 

 New York, and part of Cliff limestone of Western States 80 



Cadent series : 



Cadent lower black slate, Marcellus shale of New York 250 



Cadent shales, Hamilton group of New York 600 



Cadent upper black slate, Genesee shale of New York 300 



1 Op. cit., vol. 1., pp. 105-109. 



