STATE GEOLOGIST. 167 
In the summer of 1902 the property of the Exchange Oil Company 
was divided into 4 parts, and three of these were leased respectively to 
the Boston Oil Company, William Reeder and John Gray. In August 
the drill was once more put to work and it was expected that 30 wells 
would be drilled before the close of the year. The first wells were all 
~ small producers. They were located on the hill sides facing Cow Run 
and went to the First sand. These wells are located in territory that was 
once drilled. Not improbably the Second sand also will be tested, and it 
may be that the floor of the valley itself will be drilled over. Before this 
work began there were 26 wells making conjointly 9 barrels per day on 
the property. 
From what has been said it is apparent that the field at present is of 
little importance. It will doubtless be a small producer for many years, 
but interest will center in its past record. 
Geology of the Field—The surface formations lie in the Cone- 
maugh, Monongahela and Dunkard series. Topographically the territory 
is very rugged. Fortunately three coal seams, The Hobson, Meigs Creek 
and Pomeroy, with their associated rocks, are all above drainage, and con- 
sequently it is easy to determine the structure of the region. This has long 
been known. It was discussed by Andrews in Volume II, pages 493-99, 
of the Ohio Survey, published in 1874, and by F. W. Minshall in Volume 
VI, Chapter VI, published in 1888. Since, however, neither of these vol- 
umes may be accessible to the reader, the essential points are reviewed here. 
The Cow Run oil field lies on one of the greatest arches found in 
Ohio. In the central part of the field the Meigs Creek coal lies 245 feet 
above the bed of Cow Run, and the Pomeroy seam, 153 feet. Following 
these west along Cow Run, the Pomeroy coal falls below drainage in 
less than one-half mile, and the Meigs Creek in about one and one-half 
miles, just below the point at which Cow Run unites with the Little 
Muskingum. Going east from the centre of the oil pool, the strata, as 
shown by the coal beds, drop more than 200 feet in 2 miles. The same 
relations are found in going north and south from the centre of the uplift. 
Hence the strata make a dome from the centre of which the rocks dip in 
all directions. 
The formations in the hills along Cow Run have been measured by 
Andrews and are here reproduced. 
Feet Inches 
SVC HT Owe Sa CUeaten trad hobs Goh discos ster lera te Ses 25 00 
COGIEBELOOS ONES COM Mer creo ee ok it 4 
(OUGINT Sg SBS) GN Glo Stee cea ea 0 4 
(CHOBE Sieg dich hi Gar eae eee FES CE EE 0 8 
Clave. asus). ODODE S OR ra ee 1 0 
Blackebiguminoususlate eects ccs cose 0 10 
Caller ney peels ares Wier nese ue ek 0 i 
1Geol. Sur. of Ohio, Vol. II, p. 496. 
