1884.] l6J [Stevenson. 



the dip is again south- eastward and so continues apparently to the crest of 

 Clinch mountain. 



Lower Carboniferous limestones, of which the section was given in a 

 previous memoir, are well shown along the run and the railroad grade be- 

 yond the river crossings, but the lower or Vespertine portion is wholly 

 concealed. A detailed section of the Devonian beds, as shown along the 

 railroad, is as follows, the top being at the northerly side of the little valley 

 opening from the east. 



Chemung. 



1. Shales, alternating beds of gray and reddish-blue ; 



sandy ; the gray beds hold thin flaggy sand- 

 stone ; the bluish beds are more clayey and 

 some of them are almost fissile 20' 



2. Sandstone, flaggy, gray, hard 13' 



3. Sandstone, brownish blue, finegrained, hardand 



grit like ; fracture irregular ; in laj^ers one foot 

 or more thick ; some layers contain flattened 

 nodules of clay 15' 



4. Sandstone, irregularly flaggy; clayey; some parts 



micaceous ; fucoids one inch in diameter and 

 more than two feet long 16' 



5. Conglomerate, pebbles from size of pea to an inch 



and a half, mostly white quartz, some of dark 

 quartzite and occasionally some of blue lime- 

 stone and chert 0' 4" 



6. Sandstone, color and structure like No. 3 3' 



7. Sandstone, flaggy 4' 8" 



8. Sandstone, in color and structure like No. 3 ; near 



the top is a ferruginous layer, 3 to 4 inches 

 thick, with Spirifera disjuncta, RTiynclionella, 

 C'honetes and Edmondia. Specimens can be ob- 

 tained only with difficulty as they are indistinct 

 on fresh surface, while the weathered surface is 

 very soft ; fine specimens of a large Ooniophora 

 occur in the other parts of the rock 4' 



9. Conglomerate, ferruginous, coarse, many pebbles 



larger than chestnuts, and mostly white quartz. 0' 10" 



10. Sandstone, flaggy ; contains in middle a fossili- 



ferous layer crowded with Chonetes 5' 



11. Conglomerate, pebbles smaller than in the others. 0' 6" 



12. Sandstone, laminated to flaggy, light gray to 



bluish and [reddish-gray ; thin layers of lami- 

 nated shale separate the sandstones ; no fossils 

 aside from bits of carbonized wood, indistinct 

 Calamite-Vike stems, some trails and indeter- 

 minate fucoids 95' 



