THE SUNBURY SHALE OF OHIO 305 
grit as probably identical with the Pithole grit of Venango 
county, Pennsylvania." Dr.I.C. White included the Pithole grit 
) 
in his ‘‘ Oil Lake group,” which he described as ‘composed of 
the Corry and Cussewago sandstone and the included Cussewago 
limestone and shale,”’? and stated that the Corry sandstone, which 
he correlated with the ‘Third Mountain Sand of Venango,” 3 
‘passes into Ohio and continues west as Dr. Newberry’s Berea 
grit outcrop.’’4 
Dr. Orton thought that the Sunbury shales became very thin 
in Trumbull county, so that the flagging stone near Warren, 
which he regarded as the equivalent of the Buena Vista stone of 
southern Ohio and the Sharpsville sandstone of Pennsylvania,5 
came ‘down close upon the Berea grit.”” Finally, regarding the 
correlation, he stated: ‘‘I am disposed to believe that the Pit- 
hole grit of Pennsylvania, as reported in many borings of the 
region, consists of this joint product of the two systems” [the 
Buena Vista and Berea sandstones |.° Later it was stated that 
Dr. White’s ‘“‘Sharpsville sandstone is our Buena Vista stone, 
and his Corry sandstone appears to be none other than the Berea 
icity 4 
Orangeville.— Vhis village in the Pymatuning valley on the 
state line is located partly in Trumbull county, Ohio, and partly 
in Mercer county, Pa. On the southern bank of the Pymatuning 
Creek, just below the bridge and dam in Orangeville on the 
Pennsylvania side, is a bank composed mainly of bluish-gray 
shales, which gave the following section : 
SECTION AT ORANGEVILLE. 
Total 
Thickness thickness 
No. feet. feet. 
5. Dark gray to bluish-gray argillaceous shales which contain 
some small iron-like concretions - - - - - - 10% 22 
* Second Geol. Surv. Pa., 13, 1880, pp. 91-97 and 15, 1890, pp. 94, 97-105. 
2 Jbid., Q4, 1881, p. QI. 3 [bid., p. 92. 4[bid., p. 94. 
5 Rept. Geol. Surv. Ohio, Vol. VI, 1888, p. 38, and Vol. VII, 1893 [1895], p. 31. 
° Proc. Am. Assoc. Adv, Sci., Vol. XXX, 1882, p. 174. 
7 Kept. Geol. Surv. Ohio, Vol. VII, 1895, p. 33. 
