I2O STRATIGRAPHY THE MONONGAHELA SERIES. 



THE UNIONTOWN LIMESTONE. 



The Uniontown Limestone, a subdivision made by J. J. 

 Stevenson from the Great Limestone of the First Geological 

 Survey of Pennsylvania, is almost wholly lacking in Lewis 

 and Gilmer, its horizon being usually occupied by red shale 

 or lenticular sandstones. On Rush Run, Courthouse District, 

 Lewis, nuggets of shaly lime were observed 2 miles south- 

 east of Edmiston, at an elevation of 1100' B., and on another 

 branch of the same run, 1.5 miles east of Edmiston, 1 foot of 

 brecciated limestone was noted at 1115' B., both of which seem 

 to represent the Uniontown. 



On a branch of Fink Creek, Freemans Creek District, 

 Lewis, one mile east of Hurst, the following relationship was 

 observed at the N. C. Lattea Coal Opening, No. 23 on Map II, 

 previously described : 



Feet. 



Coal, Uniontown 2% 



Shale, variegated 14 



Limestone, silicious, Uniontown 1 



Shale, sandy, and concealed, to run 30 



THE ARNOLDSBURG SANDSTONE. 



The Arnoldsburg Sandstone of Hennen 4 is present gen- 

 erally throughout Lewis and Gilmer where the Monongahela 

 Series outcrops, but lacks the massive character noted at its 

 type locality. It is usually green and flaggy, varying in thick- 

 ness from 5 to 30 feet, and often being separated into two 

 ledges by a shale bed. It has been noted in numerous sections 

 published in Chapter IV. No quarries were observed on this 



ledge. 



THE UPPER SEWICKLEY SANDSTONE. 



The Sewickley Sandstone of White 5 , later termed the Up- 

 per Sewickley by Hennen 6 , is one of the most persistent and 

 easily recognized sandstone horizons of the two counties. It 

 is usually a great massive cliff rock, gray in color, and having 

 large quartz pebbles slightly rounded by attrition, often reach- 



4 Ray V. Hennen, Wirt-Roane-Calhoun Rept., W. Va. G. S , p. 202; 

 1911 



I. C. White, Bull. 65, U. S. G. S., p. 60; 1891. 



"Ray V. Hennen, Doddridge-Harrison Rept., W. Va. G. S., p. 199; 

 1912. 



