60 J.J. STEVENSON — LOWER CARBONIFEROUS, APPALACHIAN BASIN 



The upper division of the limestone is apparently persistent, though 

 irregular as far westward as Wetzel county, while the distribution of 

 the shales is very irregular ; the silicious limestone is clearly persistent 

 through the four northern counties to the Ohio river, and in such 

 thickness that it ought to be present in eastern Monroe and northeast 

 Washington of Ohio ; but the western limit is not far away in Ohio, 

 for a record in Pleasants county, near Eureka, on the Ohio river, appears 

 to show that the Mauch Chunk is absent, as it gives 375 feet of con- 

 tinuous sandstone for Pottsville and Pocono,with no limestone for more 

 than 300 feet above or below, and this is confirmed by the record of 

 another well farther down the river. ^ 



The next tier of counties consists of Harrison, Doddridge, Ritchie, 

 and Woods, the last extending along the Ohio river farther west than 

 Pleasants. 



Sardis district is in the northwestern corner of Harrison. There, at 

 say 10 miles southwest from Mannington, in Marion county, a well was 

 drilled for Doctor White, and the record was kept with such scrupulous 

 accuracy as to give a standard not only for this tier of counties, but also 

 lor that next at the south, where a record is available much farther east. 

 The writer, in view of the conditions along the outcrops, ventures to 

 draw the boundary between Mauch Chunk and Pocono at a somewhat 

 lower horizon than has been done by Doctor White ; but this is rather 

 a matter of detail, as affording a more convenient mode for the com- 

 parisons to be made in later portions of this paper. The section below 

 the Pottsville, as rearranged, is 



Feet 



1. Slate and shells 8 



2. Limestone and slate 10 



3. Limestone, hard 30 



4. Red rock 15 



5. Black slate 37 



6. Limestone, hard, blue 6 



7. Limestone and shells 12 



8. Red rock . . 5 



9. Black shale ("Cave"?) 11 



12. Limestone 49 



13. Sandstone, gray 7 



14. Limestone, gray 32 



15. Black shale 4 



16. Limestone, gray 14 



})elow which comes sandstone, 45 feet, to bottom of the well. This last 

 may be taken as the Logan, so that the interval is 240 feet. Reference 



*l. C. White : Op. eit,, p. 353. 



