124 



J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



I II 



Feet. Inches. Feet. Inches 



11. Shale 30 to 40 45 Yellow sandy shale 



12. Coal bed 10 Thin 



j-45 Gray shales 



13. Sandy shale 100 to 130 



2 to 1 Coal bed 

 45 Gray sandy shales 



96 











2 to 5 





22 





1 



Dade or Eureka coal 





bed 



95 



Gray shale 



6 





20 



Black shale 



3 





I 74 



Shale 



2 



Coal bed 



U02 



Fireclay shales and 





sandstone 



14. Lower Etna conglomerate, Cliff 



rock 70 to 100 



15. Shale to 12 



16. Coal bed, Main Etna, or Clif 



vein 3 



17. Fireclay and shale 6 to 23 



18. Coal bed 1 to 6 



19. Sandstone 80 to 120 1 



20. Shale to 5 » 



21. Coal bed 3 to 6 



22. Fireclay, shales, and sandstone. 35 to 47 



23. Coal bed 3 to 6 



24. Fireclay,shales,and sandstones. 80 to 150 



Professor Safford's section is not purely local, but it was intended to 

 be representative of conditions within the space south from the Ten- 

 nessee river. The close agreement of these sections, made at so great an 

 interval of time and under very different conditions, is a welcome testi- 

 mony to the skill and accuracy of Professor Safford, whose survey 

 of Tennessee was made very largely at his own cost and without the 

 many conveniences now regarded as essential by geologists. 



The " Kelly coal " of the section is clearly the " Jackson coal bed," as 

 Professor Safford recognizes, and he is inclined to regard the " Walker ' ; 

 and " Slate " beds as equivalent to the " Sewanee " of the western locali- 

 ties. Professor Colton identifies with the Sewanee his bed at 45 feet 

 above the Cliff sandstone, but this identification, which has been accepted 

 by Mr McCalley in the Alabama reports, is not consistent with the type 

 section, where that coal bed is above the Bonair and at a varying inter- 

 val below the sandstone which is at the top of both Etna sections. The 

 thickness below the Bonair in Professor Colton's section is about 550 

 feet, coinciding with the average of the measurements given by Professor 

 Safford* 



* J. M. Safford : Geol. of Tennessee, p. 38i. 

 H. E. Colton : Cited by H. McCalley, Geol. Survey of Alabama, Coal Measures of Plateau Region, 

 1891, p. 18. 



