1887.] ^^ [Stevenson. 



me the following list of elevations of points on Clincli and Holston rivers, 

 on the line of the proposed Clinch River railroad. 



Mouth of Thompson's creek 1518 



Mouth of Weaver's creek 1503 



Mouth of Dump creek 1480.5 



Mouth of Bickley's Mill creek 1447 



Mouth of Lick creek 1443 



Mouth of Russell creek 1413 



Mouth of Bull creek 1399 



Mouth of Guest river 1373 



Mouth of Little Stony creek 1333 



Osborne's ford, about 1384 



Railroad crossing at Dingus's 1855 



Mouth of Big Stony creek 1348 



Mouth of Cove creek 1330 



Mouth of Stock creek 1303 



Mouth of Copper creek 1196 



Summit in "Big Cut," between Clinch and Holston 1579 



Big Moccasin creek, below Estilville 1341 



N. Fork Holston, at Holston Springs 1185 



Same at mouth of Opossum creek 1176 



Same at Virginia and Tennessee line 1175 



Nash's ford, on Clinch, above five miles above mouth of 

 Thompson's creek, about 1543 



Some of the elevations given in this list by Mr. Barrett, differ from ele- 

 vations of the same localities, as published in a former memoir. The dis- 

 crepancy is due to the acceptance of a wrong determination of the local- 

 ity where the work began. 



I. THE FAULTS AND FOLDS 



The Clinch River group of faults, including the New Garden, Stone 

 Mountain and Abb's Valley, lie north from the area under consideration. 

 They gradually diminish eastward in Mercer county, of West Virginia, 

 and it is doubtful whether they pass in any case much beyond the line 

 into Summers county, of the same State. Nothing further north than 

 the edge of the House and Barn synclinal of the last paper was reached 

 during this reconnaissance. 



The geological structure of the southern part of this area is not un- 

 known. Two sections were made by members of the Geological Corps, 

 under W. B. Rogers, one passing through the eastern part of Wythe and 

 Bland counties, the other through Roanoke and Craig counties, at a few 

 miles beyond the eastern limit of the writer's study. Prof. Rogers, 

 in his report of 1838, gave a summary account of the Vespertine coal 

 areas. Prof. Lesley* published notes on the geology of Wythe, Pulaski 



•Proc. Amer. Phil. Soc, Vol. is, p. 30 et seq. 



PROC. AMER. PHILOS. SOC. XXIV. 135. I. PRINTED APRIL 30, 1887. 



