CHAPTER ITT. 
I 
GENERAL GEOLOGY OF THE STEUBENVILLE 
QUADRANGLE. 
n 
DESCRIPTION OF SURFACE. 
LOCATION. 
The entire area investigated is shown by the inclosed quadrangl 
in the map, PI. IT. This map represents the Appalachian oil fieh 
and shows the areas that have produced oil and gas. 
r I he Steubenville quadrangle is located mainly in the eastern pa 
of Ohio, but extends to the east across Ohio River, including a pa) 
of the West \ irginia c " panhandle ” and a small strip about 1 mil 
in width belonging to the State of Pennsylvania. The city of Step 
benvilie is located near the middle of the quadrangle, and from thi 
place it takes its name. 
TOPOGRAPHIC FEATURES. 
The governing feature in the drainage of the Steubenville quad¬ 
rangle is Ohio River. This stream crosses the quadrangle from 
north to south almost in tlie middle. At fairly regular distance^ 
main tributaries flow into the river almost at right angles to its 
course. The smaller runs, which furnish the water for the main 
creeks, flow from the north and south, generally parallel with the 
course of the river. 
The upland surface between the streams is in general from 400 to 
500 feet above the main drainage lines. In most places the tops of 
the hills have been worn off to a smooth oval surface, but near the 
main drainage lines the ridges are narrower, the hill slopes are 
steeper, and the streams flow in deep canyons. Each small run has 
eroded a deep channel in the soft sedimentary rocks, and in all parts, 
of the quadrangle the upland is greatly dissected. 
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