GENERAL GEOLOGY OF STEUBENVILLE QUADRANGLE. 33 
tours on the Berea sand between these two wells will not coincide 
with those published on the map of the Cadiz quadrangle. 
DISCUSSION CG CONDITIONS AS SHOWN BY MAP OF BEREA SAND. 
POSSIBILITY OF THE EXISTENCE OF OTHER PRODUCTIVE SANDS. 
In the Steubenville quadrangle oil and gas are derived principally 
iiom the Berea sand. (See PI. VI.) The Salt sand has produced 
some gas (see p. 35) and the Big Injun a little oil, but practically 
the area may be considered as “ a one-sand district.” The lower 
sands of the V enango oil group probably are not present in any por¬ 
tion of this quadrangle, except along the southeastern quarter. Well 
iNo. 149, on Ci ox ton Run, was drilled 250 feet below the Berea and 
reports no sand. The record of well No. 147, previously given, 
extends 415 feet below the Berea and reports no sand. Well No. 405 
v as put down near Fernwood with the avowed purpose of drilling 
for the lower sands. It reached the Berea at 1,288 feet and was 
continued down to a depth of 3,000 feet and reports that only 
“ markers ” of the lower sands were found. On the east side of the 
quadrangle well No. 488, south of Colliers Station, was drilled 735 
feet below the Berea. Its record shows no Hundred-foot, Thirty- 
foot, nor Gordon, but does include the Fourth and Fifth sands. 
Well No. 478, on Cross Creek, produces gas from what is probably 
the Hundred-foot sand. The record obtained did not give the posi¬ 
tion of the Berea sand, but from the interval of the producing sand 
below the Pittsburg coal it is evidently below the Berea. This pro¬ 
ducing sand may extend some distance farther west, as no tests for 
the lower sands have been made between this point and Fernwood. 
UPPER LIMIT OF SATURATION. 
The major portion of the Steubenville quadrangle is within the 
same structural basin as the southeastern part of the Cadiz quad¬ 
rangle. Owing to this fact, the line of complete saturation in the 
two quadrangles should be about the same. In the Cadiz quadrangle 
this line is at an elevation of about — 280 feet, or, as the contours 
are numbered on the map of the Steubenville quadrangle (PI, VI) — 
from a datum plane 1,000 feet below sea level—at an elevation of 
720 feet. The wells of the Island Creek pool produced salt water 
and are the highest wells that may be spoken of as salt-water wells. 
In them the elevation of the sand is from 730 to 770 feet, indicating* 
that in the Steubenville basin the line of complete saturation is some¬ 
where near the 750-foot contour. 
3496—Bull. 318—07-3 
