1884.] liy [Stevenson. 



Scott County. 



Moccasin gap in Clinch mountain 1233 



Summit at Troublesome creek 1565 



Clinch river at Spear's ferry 1185 



Flat Lick summit 1540 



Slemp's gap, end of Powell mountain 1330 



Wise County. 



Wild Cat summit 1905 



Mineral city 1550 



Big Stone gap 1555 



Divide between Powell and Guest's rivers 2160 



Guest river, near Lost creek 2090 



Dickenson County. 

 Divide between Guest's and Pound rivers, at head of 



Indian creek 2605 



Mouth of Indian creek of Pound river 1513 



Big Sandy river at Kentucky line 854 



L THE GENERAL STRUCTURE. 



As is already familiar to those who have read Prof. Lesleys memoir 

 of April, 1871, or that of January, 1881, by the writer, the especial interest 

 attaching to Southwest Virginia lies in the great faults or cracked anti- 

 clinals which have so great extent both longitudinally and vertically. So 

 far as known to the writer, the existence of these faults was first indicated 

 by Prof. W. B. Rogers in his earliest report on the geology of Virginia,* 

 three principal Aiults being shown on the long cross-section. The exist- 

 ence of the Saltville and New Garden faults is asserted in a paper on 

 Thermal Springs by the same author and in a long memoir on the struc- 

 ture of the Appalachian Chain by Profs. W. B. and H. D. Rogers.f Some 

 of these faults are very simple in structure, but others are sufficiently com- 

 plex. Groups of anticliuals occur, canoe-shaped and overlapping, thus 

 reproducing the features so characteristic of Silurian and Cambro-Silurian 

 areas of Central Pennsylvania. 



The structure may be considered most conveniently by going from the 

 Great Valley northward to the Coal Measures area, taking the more prom- 

 inent features in order as follows : 



The Fault of Walker mountain. 



The Saltville fault. 



The Clinch Mountain group of folds. 



• W. B. Rogers. Report of the Geological Reconnaissance of the State of Vir- 

 ginia. 1836. 



t These papers arecontained in the volume of Transactions of the Association 

 of American Geologists and Naturalists. 1840-i2. 



