1881.] ^tJO [Stevenson. 



stone near Lewisburg, West Virginia. The red shales underlying the lime- 

 stone unquestionably belong not with the limestone, but with the under- 

 lying shales and sandstones. In Brush mountain and its vicinity in 

 Montgomery county, Prof. Fontaine found : 



The upper member 1090' 



The middle member 670' 



The lower member 930' 



In all 2690' instead of 1160, as on the Greenbrier river. Coal beds occur in 

 both sections. But when the line of the Bristol Railroad is reached in 

 Brushy mountain very near the border line between Scott and Washington 

 counties, this great mass has diminished to barely 100', its coals have dis- 

 appeared and there remains of it nothing but some shales and shaly sand- 

 stones, most of them more or less calcareous. In eastern Tennessee the 

 distinction between the Protean and the Upper member is obscure, owing 

 probably to increase of limestone in the lower member. 



The Devonian. 



This is represented by the Chemung and Hamilton. The Coniferous 

 and Catskill are absent. 



The full section of the Devonian was seen only in Brushy mountain and 

 the Poor valley between that and Clinch mountain. The first ridge of 

 Brushy movintain is composed of Devonian rocks, and very fair exposures 

 of the series can be found along lines running from the foot of Clinch 

 mountain through the numerous gaps in that ridge. The succession is 



Chemung 300' 



Hamilton 830' 



But in the Poor valley of Stone mountain and along the face of Powell 

 mountain, the Chemung and much of the Hamilton are wanting, so that 

 the rocks of the Silicious group rest directly on the lower Hamilton shales. 



The Chemung, as shown along Brushy mountain, between Moccasin gap 

 of Clinch and the raili'oad bridge over Nortli Fork of Holston, consists of 

 irregularly bedded sandstones and shales, containing more or less of nodular 

 clay iron-stone and some dark shale. Fossils are not very numerous, but 

 two thin layers associated with conglomerate bands show characteristic 

 Chemung species, Spirifera disjuncta and Productella hoydii, along with 

 Chonetes and other forms which could not be obtained in good enough con- 

 dition for identification. Spirophyton occurs plentifully in the lower beds. 

 These rocks are well exposed along the railroad excavations between 

 Mendota and the Holston bridge. 



The Hamilton is triple, dark shales on top, yellow sandy shales in the 

 middle, and black, more or less carbonaceous shales below ; thus showing 

 the general divisions observed in New York and Pennsylvania. All three 

 of the divisions were seen in the Poor valley and Brushy mountain ; but in 

 the vicinity of Stone mountain and of the North Fork of Clinch river, only 

 the lower black shales were found. The thickness of these near Stone 

 mountain i§ probably not more than 125 or 150 feet, while at one locality it 



