WEST VIRGINIA GEOLOGICAL SURVEY. 39 



the Shinnston Syncline. The surface geology along the fold 

 in Lewis is principally that of the Conemaugh Series, as the 

 Monongahela touches only the high ridges. 



Chestnut Ridge Anticline. The Chestnut Ridge Anti- 

 cline, first designated by J. J. Stevenson from a ridge of the 

 same name in Fayette County, Pennsylvania, is the most im- 

 portant structural uplift in Lewis and Gilmer. It crosses the 

 Lewis-Harrison Line 1.5 miles west of the common corner of 

 Lewis, Harrison and Upshur, extends in a general southwest- 

 ward direction through Jacksons Mill and Camden, passes 

 about one mile southeast of Alum Bridge and Linn, extends 

 through Baldwin, crosses the Little Kanawha River at Glen- 

 ville, passes about one mile eastward from Lettergap and Nor- 

 mantown, crosses Steer Creek at the mouth of Crooked Fork 

 and reaches the Calhoun Line at a point one mile east of the 

 common corner of Lee, Washington and Center Districts. 

 Along most of its length, the fold is symmetrical about its axis, 

 the dip being usually about the same on the northwest and 

 southeast sides. 



The surface geology along the axis is principally that of 

 the Monongahela and Conemaugh Series. The Pittsburgh 

 Coal is above drainage at all the principal stream crossings. 

 At the Lewis-Harrison Line the coal has an elevation of 1400 

 feet, but descends to a saddle at Hackers Creek where it is 

 only 1350, rises again to a dome with an elevation of 1400 

 feet at Jacksons Mill, where it intersects with the Wolf Sum- 

 mit Anticline, dips continuously at the average rate of 30 feet 

 to the mile throughout the next fifteen miles to the Gilmer 

 Line, where the elevation is 950 feet, rises to a low dome 

 with an elevation of 1000 feet on Stewart Creek near Bald- 

 win, dips again to a saddle between the Little Kanawha and 

 Cedar Creek, where its elevation is only 925 feet, rises again 

 to a dome near Lettergap, with an elevation of 975 feet, 

 and descends gradually to the Calhoun Line, where it is 900 

 feet above sea level. There is a total southwestward dip of 

 500 feet along the axis between the Harrison-Lewis and the 

 Gilmer-Calhoun Lines, the distance being 46 miles, making an 

 average dip of about 11 feet per mile. 



