344 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1902. [bull. 213. 
house of Mr. McGarey on the road from Yellow Creek to Kilgore. 
This well, although small, will produce a paying quantity of oil. 
CONCLUSIONS FROM THE RESULTS OBTAINED. 
The results of the developments during the last year seem to afford 
strong evidence in support of the theories advocated in Bulletin 
No. 198. 
Over the area tested the map has proved to be of such accuracy 
that it may be relied upon within a limit of the contour interval. 
This should make the map of great value to the oil producer as a 
guide to the location of new wells. 
It is believed that a map of the different oil sands can be made over 
the Appalachian oil field by careful geologic work and the united 
assistance of the oil operators in furnishing full and reliable well 
records that will be of immense value to the oil industry. 
The result of the extension of the Snyder pool in a line exactly 
agreeing with the contour line representing the Berea grit furnishes 
strong evidence in favor of the water-line theory. 
USE OF A MAP OF AN OIL SAND IN UNPROSPECTED TERRI- 
TORIES. 
The use of a contour map of an oil sand to locate new pools in 
unprospected territory will materially aid the prospector, but can not 
be absolutely relied upon, as the other conditions necessary for an 
accumulation can only be learned by actual tests. 
In the north part of the Cadiz quadrangle is an east- west syncline 
with a decided rise on its north sid<\ Here is a favorable structure 
for an accumulation of oil and gas, though the exact point at which 
the oil would be found would be hard to select. 
In making a systematic search for productive territory in this 
neighborhood the first test well should be drilled in the southeast 
corner of sec. 25, T. 11 N., R. .'), with a view of determining the condi- 
tion of the sand, expecting if a favorable sand without oil is found to 
obtain salt water. If no good sand is found, the result is a complete 
failure and no information of value is gained. If, however, a good 
sand containing salt water is found, a move to the northwest equal to 
a distance that will cover two or three contours on the map of the 
sand would be advisable, and so on until oil or dry sand is found. 
If moves not longer than the distance bet ween two contours are taken, 
it is not probable that the oil belt will be jumped, for the indications 
near the oil are such as to be distinguished by any operator. If oil 
is found, it probably lies in a narrow belt along the slope, and the 
extensions of the pool should be sought along the same structure con- 
tours upon which it is procured. 
