124 STRATIGRAPHY THE MONONGAHELA SERIES. 



THE CEDARVILLE SANDSTONE. 



In Lewis and Gilmer the Monongahela Series often con- 

 tains a considerable sandstone stratum just above the Red- 

 stone Coal. It is noticeable in many localities but in south- 

 western Gilmer it attains massive proportions. At Cedarville, 

 Center District, it forms a prominent cliff at the eastern end 

 of the town, being 41 feet by hand level above the Pittsburgh 

 Coal, which crops in the public road, and 74 feet above drain- 

 age. Here the sandstone is massive, greenish gray, medium 

 coarse and hard, with flakes of mica and occasional spots of 

 iron peroxide, being 32 feet thick, as shown by the section for 

 Cedarville published in Chapter IV. As this sandstone has 

 not previously been noted or named, it will hereafter be called 

 the Cedarville Sandstone in this Report. 



THE REDSTONE COAL. 



The Redstone Coal of H. D. Rogers, named from its out- 

 crop along Redstone Creek in Fayette County, Pa., occurs 

 generally throughout Lewis County, being usually free from 

 slate partings and varying in thickness from 3 to 6 feet, and 

 coming 35 to 50 feet above the Pittsburgh Coal w^hich it rivals 

 closely in commerical value. In Gilmer it is seldom present 

 and is apparently of little value there. The outcrop of the 

 Redstone Coal is shown on Map II in those regions where 

 it has minable thickness. Its thickness, character, chemical 

 composition, and extent, together with many measured sec- 

 tions, will be discussed in Chapter XI. 



THE WESTON SANDSTONE. 



In Hackers Creek, Freemans Creek, Courthouse and Skin 

 Creek Districts of northeastern Lewis, where the Redstone 

 Coal, Redstone Limestone, and Pittsburgh Coal all appear in 

 conjunction, having been traced directly up the Monongahela 

 and West Fork Rivers by the geologists of Pennsylvania and 

 West Virginia, leaving no doubt as to their correlation, a sand- 

 stone is usually found lying between the Redstone Coal and the 

 Redstone Limestone. So far as known no sandstone member 



