188 THE DEVONIAN AND CARBONIFEROUS. [bull. 80. 



The following classification 1 modified from that of Mr. Edward Orton, 

 is given by the author : 



Feet. 



H- |Sd£fc;:::|--"w«» 



Cuyahoga or Waverly series... t (Conglomerate II.) ) 



Kiuderhook V 50-60 



( (Conglomerate I.) ) 



f Waverly shale 40 



Berea or Transition Series | Berea shale 200-400 



(Western equivalent of upper { Berea grit 50-00 



Chemung). j Bedford shale 50 



t Cleveland shale (local) 50 



Erie shale. — Eastern or typical Chemung, lower part 100 



The classification adopted in his tables is as follows: 



III. Keokuk and Burlington groups, Upper Waverly (Upper Logan), separated into 



three zones in instable, but into five on p. 100 of the text, and there amounting to 



80 feet of thickness, or not over 125 feet. 

 II. Kiuderhook (part or all), middle Waverly, 



This is subdivided into two zones in table, but into four zones on p. 101 ; the upper- 

 most of which is Conglomerate II; the thickness, 52 feet, without the Conglom- 

 erate, which is but a few inches or feet in the specific cases given. 

 I. Transition zone. — Devonian, in part equivalent to Chemung and Portage. 



The upper zone of this division is the Conglomerate I, 18 inches thick in one of the 

 sections. In the table five zones are mentioned, on pages 100 anil 101 ; seven zones 

 are given, about 350 feet in thickuess and not over 500 feet. 



Below this is the Bedford shale. 51 feet (Hamilton facies in Chemung association), 

 with the Black or Hamilton shale next below. 



He concluded that his middle Waverly " is representative of the Cat- 

 skill," but is not strictly equivalent to it. 



The " Berea shale" is more than Orton's black shales, so named, but 

 " the greater part of the shales below the Kinclerhook." 



He did not consider it necessary " to conclude from the fact that the 

 Erie shales are of Chemung, age that all which lies sfcratigraphically 

 above the Erie is certainly later faunally than the top of the Chemung 

 as seen in New York strata." 2 



Above the Waverly group traces of the higher faunas were seen in 

 the "Maxville limestone," east of Rushville. This " Maxville lime- 

 stone" fauna is correlated with the Chester limestone of the interior. 3 



The latest systematic classification of the rocks of Ohio is reported 

 in the sixth volume of the Geological Survey of Ohio. 4 This will ex- 

 hibit the present state of development of correlations for the State: 



Feet. 



18. Glacial drift 0-550 



17. Upper Barren Coal Measures : 500 V 



16. Upper Productive Coal Measures 250 



15. Lower Barren Coal Measures 500 



14. Lower Productive Coal Measures 250 



13. Conglomerate group 250 



1 Herrick, C. L. : A sketch of the geological history of Licking County, accompanying an illustrated 

 catalogue of carboniferous fossils from Flint Ridge, Ohio. Denison Uuiv., Bull., vol. 4, pp. 105-106 

 Hbid., p. 111. 

 'Ibid., vol. 3, pp. 21-23. 

 * Vol. VI., Economic Geology, by Edward Orton. Columbus, 1888. 



Carboniferous. 



