DUNKARD FORMATION 115 



Feet Inches Feet Inches 



11. Coal ^ rs 0^ 



Sandstone, shale I Waynesburg B ' \ '^ -^^ f ^ ^ 



Coal, black shale ] (2 3] 



12. Limestone and clay 3 0^ 



13. Sandstone 47 l 50 9 



14. Colvin limestone and clay 9 j 



15. Waynesburg A coal bed and black shale 4 5 3 5 



16. Clay, sandstone, shale, thin limestone 59 10 61 



to the Waynesburg coal bed. The coal beds are approximately 



Feet Feet 



Waynesburg A 60 61 



Waynesburg B 124 115 



Washington 176 149 



feet above the Waynesburg. The first coal above the Washington is 

 reported from only one other locality in Pennsylvania. The Washington 

 A at Brier Hill shaft has three coal layers in all, 2 feet 1 inch thick, 

 but at the Lambert the three layers of almost equal thickness have 5 feet 

 7 inches. Southward the section does not reach to the Dunkard, but 

 westward,- toward the Monongahela river, the Wa3Tiesburg sandstone 

 becomes very massive. 



WEST FROM MONONaAHELA RIVER, IN PENNSYLVANIA 



The Washington coal bed at its most northerly exposure in Allegheny 

 county is 3 feet thick and 320 feet above the Pittsburg, with the Blacks- 

 ville limestone 25 feet above it and 4 feet thick. At 4 miles west the 

 coal bed is 75 feet above the Waynesburg, while 3 miles south, in Snow- 

 den township, the interval is 90 feet, and the Waynesburg A is seen 

 at 50 feet below the upper bed.* 



The Lower Washington and Colvin limestones appear first in Cecil 

 township of Washington county, 8 miles south from the last locality, 

 and at 8 miles west the Blacksville limestone, 20 feet thick, is 30 feet 

 above the Washington coal bed, which almost directly underlies its lime- 

 stone. Here the Little Washington as well as the Waynesburg A is 

 seen and the Colvin limestone is 15 feet thick. The Waynesburg sand- 

 stone is represented only by sandy shale and the Cassville shale contains 

 4 feet of limestone. The Washington and Waynesburg coal beds are 

 85 feet apart, but at 4 miles northwest, in Smith township, this interval 

 decreases to 65 feet, and the Upper Washington limestone, 6 feet thick, 

 is only 110 feet above the Washington coal bed. This is the most 



* J. J. Stevenson: (K), pp. 303, ,306, 313. 



