40 STRUCTURE. 



Orlando Anticline. The Orlando Anticline, not previ- 

 ously named or described, is an arch in southern Lewis be- 

 tween the Grassland and Roanoke Synclines, having its 

 northern terminus along Rush Run, l l / 2 miles southwest of 

 Brownsville, and extending southwest, 11 miles, to the Coal 

 and Coke Railway, which it crosses at the mouth of Road Run, 

 three-fourths mile west of Orlando, beyond which it has not 

 been traced. It crosses the Lewis-Braxton Line one mile norch 

 of Orlando. This anticline is almost straight and nearly sym- 

 metrical about its axis, the dip being slightly more rapid on 

 the western side. 



The surface geology along the arch is principally that of 

 the Monongahela and Conemaugh Series. At its northern 

 terminus the Pittsburgh Coal has an elevation of 925 feet, but 

 rises rapidly southwestward until it has an elevation of 1075 

 feet along the Courthouse-Collins Settlement District Line 

 near Rush Knob, and descends to about 1050 feet at Orlando. 



Synclines. 



Four synclines, the Robinson, Shinnston Grassland, and 

 Roanoke, appear on the structure map. 



Robinson Syncline. The Robinson Syncline of Hennen 4 

 enters Gilmer County from Doddridge one mile east of Spur- 

 geon and can be definitely traced southwestward for a distance 

 of four miles to a point near Coxs Mill, when it merges into 

 the general monoclinal slope west of the Chestnut Ridge Anti- 

 cline for the next ten miles, but again assumes a distinct 

 synclinal form one mile northeast of Revere, and extends 

 southwestward four miles to the Gilmer-Calhoun Line. The 

 two portions of the fold shown in Gilmer are lacking in sym- 

 metry, the rise of the southeast side being much more rapid 

 at both ends than on the northwest side. 



The surface geology along the syncline is principally that 

 of the Dunkard Series. At the Doddridge-Gilmer Line the 

 Pittsburgh Coal horizon has an elevation of slightly over 400 

 feet, but rises rapidly along the axis to about 550 feet at the 



'Ray V. Hennen, Marshall-Wetzel-Tyler Report, W. Va. Geol. Sur- 

 vey, p. 69; 1909. 



