MAP OF THE REGION 



619 



Figure 1. — Map of Appalachian Region 



Showing relation of developed oil field to the 60 per cent line of fixed carbon in coals. 

 With a few minor local exceptions, neither oil nor gas has been found east of the west- 

 ern face of the outermost strong fold of the Appalachians. Between this face and the 

 «U per cent carbon line there is considerabh; gas in the north (smaller amounts in the 

 south) and an occasional small oil pool. The main developed oil field lies west of the 

 t)0 per cent carbon line. That it does not extend farther west and south is because of 

 the less favorable stratigraphic and structural conditions. There are, however, numer- 

 ous small oil pools in this belt in Ohio, Kentucky, and Tennessee. 



XLVII — Bull. Geol. Soc. Am., Vol. 28, 1916 



