748 GEOLOGY OF OHIO. 



stone Coal " or " Mud Vein," because of its proximity to a limestone 

 which underlies it, and of its containing a seam of shale or clay. A. 

 hard non-plastic clay is again found here above Coal No. 5, but its value 

 has not been fully tested. A fire-clay 6 feet in thickness, lying 25 feet 

 above Coal No. 3, was at one time worked by McFadden & Carlisle, and 

 was shown to be for some purposes of superior quality. For the manu- 

 facture of drain-pipe it was, however, found to be less desirable than the 

 clay under Coal No. 3, and this was therefore used in preference. 



The following section was taken from Knoxville due south to Island 

 Creek. 



FT. IN. 



1. Hill-top at Knoxville, 600 feet above railroad, at Sloan's Station. 



2. Slope with outcrop of buff limestone 76 



3. Coa! outcrop, reported 1 6 



4. Interval, where exposed, yellow and greenish shales 108 



5. Cod? JVb. 8, Pittsburgh seam 4 



6. Fire-clay 4 8 



7. Buff limestone 2 6 



8. Interval — shales and limestone where observed 142 



9. Hard blue limestone - --- 3 



10. Shale : 10 



11. Crinoidal limestone - 2 



12. Sandstone and shale to creek 153 



The clay works at Sloan's Station are the last now in operation on the- 

 Ohio side in descending the river. The rocks here dip rapidly south- 

 ward, and Coal No. 3 and its clay are said to disappear below the Ohio 

 at the northern extremity of Brown's Island. At King's Creek, on the 

 Virginia side, however, they are seen at about the same level as at 

 Sloan's Station, and the clay is there used for the manufacture of fire- 

 brick. 



Between Sloan's Station and Brown's no coal has been found of work- 

 able thickness and good quality, although the explorations in search of 

 it have been quite extensive. 



Near Jeddo, half a mile from Sloan's, a coal seam has been opened on 

 the farm of Mr. Campbell, which is apparently the same as that worked 

 by Mr. Thos. Wells, and also with that marked Coal No. 5 in the section 

 at Brown's Station. At Mr. Well's mine the section is as follows : 



1. Gray shale. 



2. Coal No. 5(?) containing much sulphur 2J feet. 



3. Shale 6tol0 " 



4. Coal 3to 4inche8. 



5. Black shale... 1 foot. 



6. Massive sandstone to the Ohio, an* forming bed of river...... 45 feet. 



