GENERAL GEOLOGY OF STEUBENVILLE QUADRANGLE. 35 
ISLAND CREEK POOL. 
Wells Nos. 114 to 170, with few exceptions, represent the Island 
Creek pool. The western limit of this pool seems to be pretty well 
Nos. 142, 143, and 144, which are all on 
the theoretical extension of the pool in that direction. Well No. 145 
is a fair “ gasser ” in the Berea sand. Since the 750-foot contour of 
the sand passes one-half mile southeast of the well, the conditions 
seem to be favorable for a water-line accumulation of oil at this 
point. 1 he east end of the Island Creek pool has extended up the 
stiuctuial slope higher than would be expected. From the vicinity 
of wells >vos. 114 and 115 the producing territory should extend due 
cast, south of the village of Pekin, and on to the headwaters of Little 
Island Creek, across Browns Island, and north of Braithwaite sta¬ 
tion. I lie writer does not intend to predict that oil will be found 
to this extent, but to imply that the area is favorable, since the 
location is about the top of the completely saturated area of the 
Beiea sand. I rom this line northward the sand rises rapidly. It 
is to be expected, that the oil would accumulate at the base of the 
anticlinal dome on the south, as it has on both the east and west, A 
small amount of oil has been procured in Avells Nos. 387, 388, and 381). 
If development from these wells had been extended a little north of 
Avest instead of in a north-south line, the probabilities are that the 
results would have been favorable. 
BLUCK POOL. 
The Bluck pool in Island Creek township is the latest discovery 
in the Steubenville quadrangle. To the north and east it is limited 
by gas Avells and* dry holes. The structural conditions are such as 
to indicate the extension of the pool due Avest. 
WINTERSVILLE TERRACE. 
Tavo miles northwest of the village of Wintersville is a structural 
terrace, which presents a favorable location for oil. The top of 
this flat is beloAV the line of complete saturation. The oil should, 
therefore, be on the top level of the terrace. Well No. 517 pro¬ 
duced large quantities of salt water. No positive information was 
obtained with reference to well No. 518, though it was reported dry, 
but theoretically its location seems to be good. The best location 
seems to be betAveen Nos. 518 and 402. 
GAS WELLS NOT FROM THE BEREA SAND. 
Wells Nos. 400 and 401 are represented on the map of the Berea 
sand. They Avere not, hoAveA^er, drilled to that sand. In the Salt 
sand a heavy floAv of gas Avas encountered through which it was 
