West of the Alleghany Mountains. 



237 



At a short distance east from each of these localities, the 

 heavy limestone shown in Section V is seen forty to seventy 

 feet thick. Westward the sandstone prevails to the ontcrop. 



A comparison of these sections shows that the heavy lime- 

 stone of Section V has been removed to be replaced by 

 sandstone. That the entire removal, shown in Section II, 

 was not the work of a single current is evident from Section 

 I. The first or earlier current exerted its force before the 

 close of the liraestone-making epoch and the formation of 

 Coal IX. The five and one-half feet of limestone shown in 

 Section I yields a hydraulic current which is equal to any 

 manufactured in our country. The upper layer of the lime- 

 stone of Section V possesses hydraulic properties, where 

 exposed, along the Central Ohio railroad, at New Egypt, 

 Flushing, at Wheeling Creek, and at other localities in 

 Belmont County, as well as at many places in Harrison 

 County, so that we cannot doubt that it and the limestone 

 at Barnesville are synchronous. The force of this earlier 

 current must have been irregular, for at Deersville it has 

 removed both limestone and shale, but has left the coal 

 untouched ; at Moorfield it has spared the lower layer of 

 limestone ; while at Sewellsville and Barnesville it has re- 

 moved everything above the lower division of the coal and 

 has trenched that deeply from these points westward to the 

 outcrop. The second current did not exist until after the 

 formation of Coal IX, and seems to have acted more energet- 

 ically at the north than at the south. At Barnesville it 



