GENERAL GEOLOGY OF CLAYSVILLE QUADRANGLE. 
65 
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(lie best structural position (No. 94(>) was abandoned a short distance 
below the Pittsburg coal. If productive this well should have found 
oil in the Fourth or Fifth sands, with water in the Gordon sand. The 
record of well No. 830 mentions no salt water, though doubtless the 
Gordon at least is saturated, but reports gas in the Fifth sand. It is 
possible that this well touches the Fifth sand above the salt-water 
line; if so, it would seem that a well near the edge of the quadrangle 
east of this point might find oil in the lower sands. In view of the 
analogy between this basin and the Finney trough, it seems remark¬ 
able that no productive territory has been found along its bottom or 
sides within the quadrangle. This may be accounted for by the 
facts that the Gordon sand is completely saturated in this region and 
that the Fourth and Fifth sands have no water in them, except pos¬ 
sibly in the shallow basin at the south, or that the salt-water line in 
the last-named beds encircles the steep sides of the basin, with only a 
narrow belt of oil on the slope directly above. It may be that the 
wells of the Point Lookout pool get their oil from this belt and that 
accumulations at about this level may be found southwest of this 
field. These pools, if present, will be difficult to locate, however, ow¬ 
ing to their narrowness, the steep dip of the rocks, and small inac¬ 
curacies in the map of the structure. 
Practically nothing is known regarding the geologic structure and 
the conditions of the oil sands in that portion of the quadrangle for 
which no contours are drawn. On the convergence sheet are shown all 
the wells that have been drilled to date in the quadrangle or near 
enough to the west edge to make a knowledge of the conditions found 
in them of value in a study of the sands in the quadrangle. Except 
those of wells Nos. 1120 and 1121, not a single record seems to have, 
been preserved. In other words, of the $40,000 or $50,000 expended 
in examining this region nothing remains except a dozen dry holes 
and a little hearsay knowledge handed down from mouth to mouth. 
Enough facts might have been secured by careful observation of the 
local conditions of the rocks passed through, the amount of salt water 
encountered, and by good measurements of distances between beds, to 
enable the geologist to outline clearly those remaining localities that 
are worth testing. It is quite possible that within this unmapped 
area there is valuable oil territory, but its discovery and exploitation 
will probably cost several more wells than would be necessary if the 
work were guided by a good structural map of the sands and a 
knowledge of their condition and degree of saturation at the points 
where they have been touched. 
No record of well No. 1125 was found. The distance to the Pitts¬ 
burg coal and Gordon sand, as remembered by persons residing in 
the vicinity at the time, was used in the mapping. Well No, 1175 
3496—Bull. 318—07-5 
