PENNSYLVANIAN. 



451 



The area in Tennessee mapped by Keith begins not far beyond the region mentioned and 

 joins, on the south, the district studied by Hayes. It includes the Briceville and Wartburg 

 quadrangles," which present a complete cross section of the coal field. The formations, distin- 

 guished on lithologic grounds, are as follows: 



Pennsylvanian formations in BriceviUe and Wartburg quadrangles, Tennessee. 



Briceville. 



Wartburg. 



Anderson sandstone: Shales, sandstones, conglomerates, and coals. [Eroded.]. 



Scott shale: Sandy shales, sandstones, and coals 



Wartburg sandstone: Sandstones, shales, and coals 



■ Briceville shale: Shales, sandstones, and coals 



Lee formation: Sandstones, conglomerates, and thin coals 



Feet. 

 I, 000+ 

 650-500 

 650-500 

 650-250 

 1, 500-500 



Feet. 

 500+ 

 600-500 

 600-500 

 400-250 

 900-375 



It is suspected that the maximum Lee here may extend one sandstone higher than in the 

 regions to the northeast, though the Big Creek Gap outcrop of the Lee, near the eastern margin 

 of the Briceville quadrangle, is given by the writer^''' as about 1,250 feet thick. In general, 

 however, the Lee is doubtless essentially equivalent to the division under the same name farther 

 east, the variations being probably local. The inclusion of middle Pottsville terranes in the 

 "Lee" of the Kichmond and London quadrangles in Kentucky has already been mentioned. 

 The Sewell age of the Briceville shale is agreed on, and the horizon of the Corbin (equivalent to 

 the Nuttall sandstone) is placed by Stevenson ''^■'^ in the bottom of the Wartburg sandstone. 

 The Scott shale, together with the upper part of the Wartburg and the lower part of the Anderson 

 sandstone are correlated, on the paleobotanic evidence, with the Kanawha, and therefore 

 placed ia the upper Pottsville. The lack of prospecting and exposures of the soft beds on the tops 

 of the mountains have rendered the acquisition of fossil plants very difficult, and the Allegheny- 

 Pottsville boundary is still undetermined. However, the Anderson of these quadrangles, the 

 Bryson of the 'Cumberland basin, and the Harlan of the Big Stone Gap field are paleobotanically 

 shown to be in part contemporaneous, each seeming to reach up into the post-Pottsville. It is 

 probable that the highest beds of these formations, occurring only on the top of a few of the 

 highest mountains of these regions and, in Tennessee, limited to these two quadrangles, comprise 

 the last and only Allegheny Pennsylvanian remaining in all this southern region of the coal 

 fields. 



For comparison the section given by Campbell for the southern half of the Standingstone 

 quadrangle, west of the Wartburg, is repeated: 



Lee formation: 



Rockcastle conglomerate lentil; 100-180 feet, sandstone and conglomerate. 

 Shale and sandstone, 125 feet. 



Bonair conglomerate lentil, 100-200 feet, conglomerate, sandstone, with inclosed or underlying 

 coals, resting on the Mississippian. 



The total of these divisions, about 375 feet* at the western outcrop in this quadrangle, 

 agrees with the western outcrop measurements of the eastern Lee, given by Keith as 375 feet 

 in the Wartburg quadrangle to the south. Stevenson's correlation of Campbell's Rockcastle of 

 the western region witTi the top conglomerate of the true Lee as mapped along the eastern 

 margin of the coal field appears to be well established. 



The Sewanee conglomerate of Safford and Killebrew, which along the western margin of 

 the coal field in this region, this being the region of "Sewanse" transgression, locally rests 



« The Cumberland basin terminates on the southwest in a faulted cross anticline, along Fork Mountain, in the 

 Briceville quadrangle. 



6 The total, including the Rockcastle and underlying Pennsylvanian beds in the northern half of the Standingstone 

 quadrangle, is given by Campbell as 200 to 400 feet. 



