WEST VIRGINIA BASIN 61 



to the Marion County records shows a notable change in the upper part 

 of the section, for the shales and sandstones have disappeared, while the 

 upper limestones of the Mannino;ton well have increased greatly. The 

 general structure of the silicious limestone, numbers 12 to 16, is that 

 observed at both Fairview and Mannington. The thickness varies, being 

 97 at Fairview, 146 at Mannington, and 106 at Sardis, but the extreme 

 thickness at Mannington is due mostly to the local increase of the sand- 

 stone, number 13, which there is 37 feet. A record in the southern part 

 of the county shows the sandstone still present, with 96 feet of limestone 

 below it. 



Near Center Point, in Doddridge county, about 10 or 12 miles west 

 from the White well, the section is similar, though differing somewhat 

 in detail. It is given in full : 



Feet 



1. Slate 9 



2. Limestone 40 



3. Red rock 36 



4. Limestone 13 



5. Eed rock 11 



6. Slate 9 



7. Limestone 31 



8. Slate ("Pencil")..-. 15 



I 9. Limestone 58 



1 0. Sandstone 13 



11. Shale 2 



resting on 72 feet of sandstone to bottom of well. Here, as at Sardis, 

 the upper shales are probably wanting, for the Pottsville rests on num- 

 ber 1. The limestone of the upper division has increased, as has also 

 the upper part of the silicious limestone. The " Keener " persists, but 

 the lower part of the limestone seems to have disappeared. Another 

 well near by shows no shale, but a great increase in the upper limestones, 

 which are, descending, 56, 39, 30, while the silicious has become 69 feet. 

 Ten miles south from this locality the Mauch Chunk interval is given as 

 310 feet, with slate shells and limestone 230 feet; slate, 10 feet; lime- 

 stone, 77 feet. This appears to show that the upper shales are present. 

 A notable change in conditions appears in south central Doddridge, 

 where at 8 miles east from the Ritchie county line the whole interval is 

 but 105 feet, not including the '' Keener," and. the silicious is but 25 feet. 

 The rocks above the latter are unrecorded. 



Passing over into Ritchie county, one finds the records abundant and 

 interesting. In southeastern Ritchie, about 8 miles from the last-men- 

 tioned locality in Doddridge, a record gives limestone, 18 feet; " Dark 

 lime, shale, and hard shell," 82 feet — practically the same interval as the 



