NOTE: The object of this drawing is to ihow graphically the amount of 
variation in the distance between the surface bed* and the oil aanda. 
Theamaller numbers, ranging from 114 to 906. indicate wells represented 
on PI. IX to which reference has been made in the text. The larger 
numbers show the measured distance in feet at these wells between 
the base of the Pittsburg coal and the top of the Hundred-foot sand. 
The straight lines radiating from those wells are lines on which the varia¬ 
tions between wells are indicated. The sinuous lines are supposed to 
pass through points of eaual distance between these beds. 
To find the approximate distanco to the Hundred-foot sand from any 
outcrop of the Pittsburg coal, first locate the outcrop on PI. IX, then 
place this sheet over P'.. IX and note the distance at the located point, 
as indicated by the sinuous lines on this sheet 
r cNVKJtGE'Nr.K SHEET OF H UIUVKTTSTOWN ( IAJ >KAXGEE,PESOS’SYLVANTA. 
showing distancelrom base olPrtislmrg eoaltr i jpoi' Hundredrfoot. sand 
• CHI walls 
1830 Distam!!' iraui taae (tf co«l fu top ■ 
627 Well mi ui tiers 
SO - 16' 
Geology by WT.Griswold. 
under the direction of 
MR.Campbell 
j&s 
Wm 
foot staid 
