256 GEOLOGY OF OHIO. 



Carya porcina (Pig Hickory) Nutl. 



Amelanchier Canadensis (June Berry) Torr and Gray. 



iEseulus glabra (Buckeye) Willd. 



Asimina triloba (Pawpaw) Dunal. 



Lindera Benzoin (Spice Bush) Meisner. 



Populus grandidentata (Large-toothed Aspen) Michx. 



Celtis occidentalis (Hackberry, or Sugarberry.) This is a large 

 tree in Morrow and Delaware counties, of two feet in diam- 

 eter L. 



GEOLOGICAL STRUCTURE. 



The geological series of the county embraces that much disputed hori- 

 zon that lies near the junction of the Devonian with the Carboniferous. 

 The names given to these members in the northern portion of the State 

 by the Chief Geologist of the present Survey are as follows, in descending 

 order. The names are not known to be applicable in the central and 

 southern portions of the State, but are supposed to be : 



Cuyahoga shale and sandstone, approximate thickness... 150 feet. 



Berea grit " " 



Bedford shale (red and blue)... " " 



Cleveland shale (black) " " 



Erie shale and sandstone (gray) " " 



Huron shale (black) " " 



Of these Dr. Newberry includes the last two in the Devonian, and the 

 remainder in the Lower Carboniferous. In the southern part of the 

 State the series seems to be different, and names that have a general par- 

 allelism with the foregoing have been applied by Prof. E. B. Andrews, as 

 follows : 



Logan sandstone ^331 f ee ^_ 



Alternations of fine sandstone and conglomerate 85 " 



Coarse Waverly sandstone and conglomerate 400 " 



Waverly black slate lg u 



Waverly shale and sandstone 130 « 



Huron shale or black slate 320 « 



In the southern part of the State Prof. Andrews extends the Waverly 

 group, and so the Lower Carboniferous, down to the Huron shale, em- 

 bracing the interval, which is probably the equivalent of the Erie shale 

 in the northern part of the State, consistent with the limits set by the 

 early geological surveys in the West, which referred the Waverly, how- 

 ever, entirely to the Devonian. It has been shown, however, by Prof. A. 



