112 STRATIGRAPHY THE MONONGAHELA SERIES. 



tions, represents the maximum number and thickness of Mo- 

 nongahela sediments noted in Lewis and Gilmer. The series 

 as observed varies in thickness from 340 to 400 feet, being 

 usually about 350: 



General Section of the Monongahela Series for Lewis and 

 Gilmer. 



Thickness Total 



Feet. Feet. 



Coal, Waynesburg 1 1 



Shale 9 10 



Sandstone, greenish brown, Gilboy 25 35 



Shale 15 50 



Sandstone, green, micaceous, flaggy, gray and 



massive in western Gilmer, Uniontown... 40 90 



Shale, greenish brown, Annabel le 8 98 



Coal, Uniontown 2 100 



Shale 4 104 



Limestone, shaly, Uniontown 1 105 



Shale, red, with limestone nuggets 30 135 



Sandstone, green, flaggy, Arnoldsburg 25 160 



Shale, red, with limestone nuggets 49 209 



Sandstone, massive, gray, pebbly, great cliff 



rock, Upper Sewickley 50 259 



Coal, Sewickley 1 260 



Shale 5 265 



Sandstone, gray, Lower Sewickley 30 295 



Limestone, red, ferriferous and shaly, Sewick- 

 ley 2 297 



Shale '.. 7 304 



Sandstone, gray, massive, Cedarville 40 344 



Coal, Redstone 6 350 



Shale 5 355 



Sandstone, gray, massive, Weston 20 375 



Limestone, Redstone 5 380 



Shale, Weston 10 390 



Coal, Pittsburgh 8 398 



DESCRIPTION OF FORMATIONS. 



THE WAYNESBURG COAL. 



The Waynesburg Coal, first named and described by H. 

 D. Rogers from its outcrop at Waynesburg, Pa., is of little im- 

 portance in Lewis and Gilmer. Usually it is not found at all 

 but sometimes a black slate appears a few feet below the 

 Waynesburg Sandstone that represents it. In Courthouse Dis- 

 trict, Lewis, the blossom of the coal was observed at several 

 points along the headwaters of various branches of Sand Fork 



