264 = J. SJ. Stevenson—Faults of Southwest Virginia. 
the blocks held between the faults vary much in’ length, the 
most extended being that between the Copper Creek and Salt- 
ville faults, where the column reaches from the bottom of the 
Knox calcareous rocks to the top of the Umbral, possibly in 
some places to the Coal Measures. 
The blocks between the faults are not always monoclinals, 
as might be inferred from a hasty perusal of some papers pre- 
sented prior to those of the writer; far from it. Where the 
blocks are broad, seven or eight miles, groups of anticlinals 
occur, canoe-shaped and ‘overlapping, thus reproducing the 
features’ so characteristic of Upper and Lower Silurian areas in 
Central Pennsylvania. But these folds are not parallel to the 
faults and any relationship appearing to exist between the 
faults and such folds is evidently fortuitous. 
Three faults entering Virginia from Tennessee, termed by 
the writer, the Poor Valley, the Wallen’s Ridge and the Pat- 
tonsville, and having a vertical extent of 2400, 2800 and 500 
feet respectively, disappear within a few miles, being simply 
fissures on the southeasterly side of a bold anticlinal, that of 
Powell-Stone Mountain, which also disappears within a short 
distance. ‘The important, persistent faults are— 
The Clinch Group, the Copper Creek, the Saltville, the 
Walker Mountain ; beside which are the short faults of Draper 
and Price Mountains in the valley, with the cross-faults, Max 
Meadows and Pulaski, extending from the Draper Mountain 
fault toward that of Walker Mountain. 
The Clinch Group of faults includes the Clinch Uplift and 
- Abb’s Valley fault of Professor Lesley’s 1871 memoir; as the 
writer ran some lines between those of Professor Lesley, he 
has been enabled to elaborate the group somewhat and to dis- 
cover a more complicated structure than was at first supposed. 
The group consists of[— 
a. The Hunter Valley fault or Clinch Uplift; 6. The New 
Garden fault; c. The Stony Ridge fault; d. The Abb’s Valley 
fault. 
The Clinch Uplift enters Scott County, Va., from Tennes- 
see, continues through that county into Russell without inter- 
ruption; but midway in the Jatter county, after bending north- 
ward, it gives off a cross fault and holds its new course into 
Buchanan County where it is soon lost. The New Garden 
fault begins in Russell County not far from the line of Scott 
and almost accurately in the place where the former fault ought 
to have beeh found had its course been unchanged; it is joined 
by the cross fault from the Clinch Uplift and it continues 
through Russell and’Tazewell Counties of Virginia into Mercer 
County of West Virginia, where it follows the northerly foot 
of Hast River Mountain to certainly twenty-five miles beyond 
