Bulletin No. 318 
Series 1 ® c ™°“ ic G “ lo P' «» 
l B, Descriptive Geology, 121 
DEPARTMENT OF THE INTERIOR 
UNITED 
STATES GEOLOGICAL SURVEY 
CHARLES I). WALCOTT, Director 
GEOLOGY OF 
OIL AND GAS FIELDS 
IN 
OHIO, WEST VIRGINIA, AND 
PENNSYLVANIA 
BY 
W. T. GRISWOLD and M. J. MUNN 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1907 
