56 OIL AND GAS; OHIO, WEST VIRGINIA, PENNSYLVANIA. 
Irwin well west of Gale. The David Craft well No. 2 (No. 953) 
shows the same distance as No. 951, and the J. S. Hunter well (No. 
954), 1 mile farther north, shows the distance to be 2,776 feet, or a 
convergence of only 4 feet. In the Bell gas well (No. 828), 1J miles 
northeast of well No. 954 and about 1 mile west of Van Buren, the 
distance from the Upper Washington limestone, which outcrops on 
both sides of this well, to the Gordon sand is but 2,701 feet, showing a 
convergence of 75 feet between this point and well No. 954. At the 
mouth of the S. J. Plymire well (No. 830) the exact elevation of the 
Upper Washington limestone is not known, but it is calculated with 
sufficient accuracy to give the distance between it and the Gordon 
sand within a few feet, the interval as determined being 2,732 feet. 
This shows an increase of only 31 feet, and is fairly conclusive evi¬ 
dence that the belt of rapid change in distance between these beds 
passes to the south of this well. This evidence is strengthened by the 
fact that the interval changes 93 feet between wells Nos. 830 and 947, 
mentioned above, as against 20 feet for the considerably longer dis¬ 
tance between wells Nos. 947 and 948. Hence the proportional dis¬ 
tance for isochor lines between wells Nos. 830 and 947 has been 
ignored, and relatively the same rapid change in distance between 
the beds is shown to the south of well No. 830 as was found to exist 
between wells Nos. 828 and 954 and also from well No. 956 to well 
No. 948. Good measurements to the Gordon sand in the Blackley * 
Bindley well (No. 952) and the Booth heirs’ well (No. 1100) would 
have definitely settled this point and admitted of the determination 
of the convergence throughout this area with much greater exactness. 
Though repeated efforts were made to procure the records of these 
wells, unfortunately neither of them could be obtained. 
To the north and west from this belt of rapid convergence the 
interval between the beds decreases at a very regular rate, so far as 
can be determined. Over a broad strip along the west edge of the 
quadrangle no attempt has been made to show the convergence, 
because no data are at hand on which to base it. A sufficient number 
of wells have been drilled in this territory, but a most careful and per¬ 
sistent inquiry resulted in procuring only two of their records, and it 
is extremely doubtful if the others were preserved. At the J. R. 
McCleary well (No. 1121), of which a record was obtained, the ele¬ 
vation of the Upper Washington limestone could not be had. In the 
William Patterson well (No. 1120) the interval shown from the rec¬ 
ord to be 2,650 feet seems a little small, if judged from that given at 
wells Nos. 1125 and 1113. For want of more information in regard 
o 
to the conditions farther west this measurement was not used. It 
will be seen from the isochor lines that northwest and north of the 
John N. Rush well (No. 1161) the distance between the beds increases. 
The straight lines radiating in those directions from this well are 
