WEST VIRGINIA GEOLOGICAL SURVEY. 159 



hard, gray and massive, sometimes carrying quartz pebbles. 

 The Jewell Section, published in Chapter IV, shows them 

 both. The Mahoning Coal and Thornton Fire Clay, which fre- 

 quently appear between them in the northern part of the State. 

 were not observed in Lewis. The crop line of the Upper Free- 

 port Coal, shown on Map II, indicates the region in which 

 they may be found, as it underlies them by only a few feel. 

 The Mahoning Sandstone is noted in many well records in 

 both counties, being called the "Big Dunkard" by the drillers. 



THE UFFINGTON SHALE. 



The Uffington Shale of White 25 , occurring between the 

 Lower Mahoning Sandstone and the Upper Freeport Coal, 

 usually being dark gray and sometimes carrying marine fos- 

 sils, is not conspicuous in Lewis where it crops. The Jewell 

 Section, published in Chapter IV, shows a ferriferous shale, 

 3 feet thick, occurring just under the Lower Mahoning Sand- 

 stone, that seems to represent it. 



5 I. C. White, Vol. II, W. Va. G. S., p. 323; 1903. 



