10 
OIL AND GAS; OHIO, WEST VIRGINIA, PENNSYLVANIA. 
Such a study should he of assistance in extending the limits of old 
and well-known fields and in locating new areas of productive 
territory. 
This paper is not based solely on the work of the Geological Survey, 
but is the outcome of a combination of the results of that work with 
information procured from the oil operators and drillers in the terri¬ 
tory. This information has been willingly furnished by the oil men. 
They have gladly allowed members of the Survey to inspect and copy 
their well records, and in many cases have put themselves to great 
inconvenience in searching through old files and procuring records 
that have lone: been out of use. To one and all of these men the 
thanks of the writers are given for their hearty cooperation. 
The field work of the Steubenville and Burgettstown quadrangles 
was done by W. T. Griswold; that of the Claysville by M. J. Munn, 
under Mr. Griswold’s general supervision. The theoretical discus¬ 
sion and the description of the Steubenville and Burgettstown quad¬ 
rangles are bv Mr. Griswold; the description of the Claysville quad¬ 
rangle is bv Mr. Munn. 
In undertaking a study of the conditions governing the accumula¬ 
tion of oil and gas, it was hoped to interest two classes of readers— 
those who are conducting similar investigations of the general condi¬ 
tions governing the accumulation of oil, and those who have a finan¬ 
cial interest in the territory under consideration. The detail required 
to make the results available to the engineer or operator who wishes 
to extend the work or to use it in locating wells makes slow and 
tedious reading. In order to avoid this, the area will first be described, 
the general conditions ’will be stated, and then each quadrangle will 
be. taken up in detail and the most important geologic and engineer¬ 
ing data available be given. 
It should be distinctly borne in mind that the primary object of 
the field work was not to examine and report on territory for prospec¬ 
tive operators, though this phase of the subject is incidentally treated 
in this report, but it is intended to present here the facts as the}^ were 
found, especially in developed areas, so that the great oil and gas 
fields as a whole may be intelligently studied with the hope that the 
fundamental truths which each field reveals may be applied in an 
everyday business way in the unceasing hunt for new producing 
areas. For this reason it is not thought best to present in great 
detail the mass of information collected in regard to developed terri¬ 
tory, such as the elevations, names, numbers, records, etc., of the hun¬ 
dreds of wells examined, nor to fill space in a reprint of the history 
of the development of these fields as given in other reports, but to 
show in as clear and concise a manner as possible the vital results 
extracted from these data so that they may be comprehended at a 
glance by the operator. 
