WELL LOGS USED FOR STEUBENVILLE CONVERGENCE SHEET. 113 
Conclusions. —These eight wells are in a line from Elclersville to 
Cross Creek, about lit miles east of the boundary line of the Steuben¬ 
ville quadrangle. They are separated by distances of one-half to 1 
mile. Their logs show that the distance from the Pittsburg coal to 
the Hundred-foot sand increases regularly toward the south. In 
well No. 206 this distance is 1,776 feet; in well No. 811, one-half mile 
to the south, 1,786 feet; in well No. 819, 1 mile farther south, 1,783 
feet; in well No. 816, one-half mile still farther south, 1,798 feet; in 
wells Nos. 820 and 817, which are one-half mile farther south and 
one-half mile east and west from each other, 1,802 feet and 1,816 feet, 
respectively; in well No. 822, 1 mile farther south, 1,83d feet, and in 
well No. 823, 1 mile still farther south, 1,846 feet. These steel-tape 
results are satisfactory. The increasing distance to the south is to be 
expected. 
The data regarding the sands above the Hundred-foot are of little 
value. The top of the Big Injun is 1,015 feet below the Pittsburg 
coal in well No. 206; 976 feet in well No. 811; 987 feet in well No. 819; 
995 feet in well No. 822, and 1,047 feet in well No. 823. The Bitter 
Rock sand is 1,339 feet below the Pittsburg coal in well No. 817; 1,480 
feet in well No. 822, and 1,497 feet in well No. 823. Well No. 820 
shows a hard sand 1,597 feet below the Pittsburg coal; well No. 822 
gives the Hundred-foot shells 1,630 feet below the coal; well No. 823 
gives the Stray sand 1,657 feet below the coal. These results prove 
that for close work no reliance can be placed on anything in a well 
record but steel-tape measurements. To make any deductions from 
other portions of the record is dangerous. 
The Bitter Rock sand in Pennsylvania is said to have the pecul¬ 
iarities of the Berea and is believed by many to be its equivalent. The 
distance of the Berea sand below the Pittsburg coal has been followed 
step by step across the Steubenville quadrangle. This distance in¬ 
creases to the southeast, reaching about 1,640 feet at the southeast 
corner of the quadrangle. The Pennsylvania well logs show the 
Bitter Rock sand to be about 1,485 feet below the Pittsburg coal and 
the Hundred-foot shells or Stray sand to be 1,630 to 1,640 feet below 
the coal. From the interval, therefore, the Hundred-foot shells are 
more probably the equivalent of the Berea sand than the Bitter Rock. 
3496—Bull. 318-07- 
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