WEST VIRGINIA — CENTRAL AND WESTERN COUNTIES 197 



in all, 192 feet to the limestone. Doctor White would place all of this 

 in the Lower Carboniferous. It certainly is equivalent in great part to 

 the red rock and associated beds of the more northerly sections, as has 

 been observed already at several localities. The blue slate of this section 

 most probably belongs to the Pottsville. Whether or not the red slate 

 is Shenango will be referred to in another place. At Oxford, in Dodd- 

 ridge county, 15 miles southwest from Long Run, the section is in con- 

 trast with those already given, for, underlying 277 feet of shale, one has 



Feet 



1 . Sandstone 55 



2. Coal bed 3 



3. Black slate '. 43 



4. Sandstone 53 



5. Black slate 10 



6. Coal bed 3 



7. Black slate 11 



8. Sandstone 40 



9. Dark slate and sandstone 19 



giving a total of 272 feet to the limestone. A coal bed is shown at 15 

 feet above number 1. At Long Run the interval from the Pittsburg to 

 the Lower Carboniferous limestone is about 1,200 feet. Here it is 1,168 

 feet, or 32 feet less, though in the interval the Allegheny is 45 feet thicker. 

 It is evident that the lower part of the section north from Long Run has 

 disappeared in this direction, and that the whole of this Oxford section 

 is Pottsville, the Shenango shales being certainly absent. The coal beds 

 are in the places for Mercer and Quakertown, and number 9 represents 

 the Sharon shale. At Harrisville, 15 miles west, in Ritchie county, one 

 finds, beginning at 1,236 feet below the Washington coal bed, or about 

 825 feet below the Pittsburg, a series 442 feet thick and separated by 

 8 feet from the limestone below ; and at Cairo, 3 miles west, the series is 

 431 to 460 feet thick, with a heavy sandstone at the bottom. These 

 sections look much like a thickening of the Oxford section, and so to be 

 Pottsville throughout. A section in the western edge of Ritchie county 

 shows 



Feet 



1. Sandstone 57 



2. Shale 99 



3. Sandstone 137 



a notable decrease, but the loss has been mostly in the shales dividing 

 number 3. Here those three beds are but 19 feet thick. In a well near 

 Cairo the shales are 164 feet. 



XXVI— Bull. Geol. Soc. Am., Vol. 15, 1903 



