142 J. J. STEVENSON — CARBONIFEROUS OF APPALACHIAN BASIN 



rolled up between the ' horsebacks ' and attaining a thickness of from 60 

 to 110 feet."* Mr Haves reports that at Harriman the dip is about 45 

 degrees northwest, and that the coal is crushed into rhomboidal blocks 

 with polished surfaces. 



At Harriman one is on the border of Safford's northeastern district, 

 where the greatest thickness of Coal Measures is found. He made prac- 

 tically no systematic study here, his volume containing only an incom- 

 plete section in northern Anderson county. Much of the region was 

 examined by Mr Keith, who has published only a brief synopsis of his 

 work. Professor Bradley made a preliminary section in Anderson 

 county. It is unfortunate that so little of detail is available for this 

 area, in which, as proved by Mr Campbell's work in southwest Virginia 

 and by the work of Professor Crandall in Kentucky, so great changes 

 take place in the Pottsville. Enough, however, is available to enable 

 one to follow out the main horizons and to recognize the more impor- 

 tant conditions. 



Mr Keith's work, beginning in eastern Fentress county, where it is in 

 contact with that of Mr Campbell, extends across to the eastern escarp- 

 ment, where it is continuous with that of Mr Ha}^es at the south. His 

 division of the section within his area is 



Feet 



1. Anderson sandstone remaining 550 



2. Scott shales 500 to 600 



Largely shale, but containing some sandstone, several coal beds, 

 of which one near the bottom is especially important and some- 

 times 6 feet thick. 



3. Wartburg sandstone : " 500 to 600 



A bold sandstone at top and bottom with other sandstone beds, 

 some of them 60 feet thick. Fully one-half of the mass is sand- 

 stone. It contains certainly five coal beds. 



4. Briceville shales 200 to 650 



Bluish gray to black, argillaceous to sandy shale, with thin sand- 

 stones and several coal beds. 



5. Lee conglomerate 400 to 1 , 200 



It is sufficiently clear that in Fentress and in western Morgan the 

 Rockcastle is taken as the top of the Lee, which is represented on the 

 general chart of the Briceville folio as embracing the Lookout and the 

 lower part of the Walden. The Lookout closes with the Bonair, which 

 is well marked in eastern Fentress, having been reached in borings near 

 Rugby. The Briceville shales overlie the Rockcastle and decrease west- 

 wardly, being only 200 feet thick in Fentress, where they underlie the 

 Corbin sandstone, the top of the Lower Pottsville. Mr Campbell finds 



* J. B. Killebrew and J. M. Safford : Resources of Tennessee, p. 197. 



