138 J. J. STEVENSON — CARBONIFEROUS OF APPALACHIAN BASIN 



able thickness. The Soddy, workable here and at the Daisy, does not 

 appear in the other sections. The Bonair is evidently only a sandstone, 

 but the Etna (Cliff) is conglomerate. Below the latter the measures are 

 475 feet, a notable thickening in the northeasterly direction, and this 

 thickening is at the bottom of the column. The lowest coal bed at Etna 

 is about 200 feet below the Etna conglomerate or at the place of number 

 22 of the Rathbun section ; but in the latter are three lower beds, the 

 lowest at nearly 400 feet. 



At Graysville, in southern Rhea county, about 12 miles northeast 

 from Rathbun, another section was obtained by Mr Hayes, as follows : 



Feet. Inches. Feet 



1. Sandstones, shales, and concealed. 550 



2. Bony coal 5 



3. Shales and sandstone. 90 



4. Nelson coal bed [Sewanee] 3 



5. Shales 35 



6. Conglomerate and massive sandstone [Bonair]. . . 115 



7. Shale 40 



8. Bony coal 8 



9. Shale and sandstone 40 



10. Sandstone 60 



11. Shale 50 



12. Coal bed to 3 



13. Shale and sandstone 110 



The lower rocks concealed or not measured. 



Number 6 is the top of the Lookout ; it here includes some of the 

 underlying shale, replaced by sandstone, as well as some of the overlying 

 sandstone. The " Nelson " bed is at the horizon of the Sewanee and is 

 190 feet above number 10, which is in the place of the number 10 at 

 Rathbun, while number 10 is at 150 feet above number 14, which holds 

 the place of the Etna coal bed in the Rathbun section. At Dayton, also 

 in Rhea county and about 5 miles northeast from Graysville, Mr Hayes 

 obtained a very important section, which is as follows, the identifications 

 in brackets being, as in other sections, by the writer : 



Feet. Inches 



1. Sandstone [Corbin] 75 



2. Shale 20 



3. Sandstone , 15 



4. Shale 25 



5. Richland coal bed 4 



6. Shale and sandstone 35 



7. Sandstone 65 



8. Shale... 20 



9. Sandstone and shale 75 



