MONONGAHELA FORMATION 61 



An imperfect section south from the Ohio, about one mile from Pitts- 

 burg, notes a coal blossom at 70 feet above the Pittsburg coal bed and 

 underlying one foot of ferruginous limestone. Sandstone and shale fill 

 the well exposed interval to the Pittsburg, and there is no other lime- 

 stone in 140 feet above the thin coal blossom. At about 8 miles south 

 from Pittsburg and very near the line of Washington county, a sec- 

 tion is : 



Feet Inches 



1. Limestone [Uniontown] 2 6 



2. Shale, sandstone, concealed 49 



3. Benwood limestone 40 



4. Clay 1 • 



5. Black shale [Upper Sewickley coal bed] . . 1 6 



6. Shale, sandstone [ Sewickley] . , 30 



7. Black shale [Lower Sewickley coal bed] . . 1 



8. Limestone, shale [Fishpot] 21 



9. Shale 50 



10. Pittsburg coal bed 11 8 



At a mile north from this locality only sandstone and shale appear 

 in 93 feet above the Pittsburg coal, so that the Benwood and Fishpot 

 limestones enter the section abruptly. The thin limestone seen near 

 Pittsburg at 70 feet above the Pittsburg evidently represents the Ben- 

 wood, and its underlying coal is at the Upper Sewickley horizon. The 

 highest limestone in this southern section, 193 feet above the Pittsburg, 

 is probably the Uniontown and is very near the place of the Waynesburg 

 coal bed. Ten miles northwest the Pittsburg coal bed is only 6 feet 3 

 inches in all and the Benwood limestone at 100 feet higher is 25 feet 

 thick. The Fishpot at 60 and the Eedstone at 30 feet above the Pitts- 

 burg are clearly present. 



Crossing over into the northwest corner of Washington county, one 

 finds a little area in which the Pittsburg coal bed is quite thin, 4 feet 

 to 5 feet 2 inches, with nodular limestones representing the Eedstone 

 and Fishpot at 20 and 40 feet above it. The limestones are irregular 

 north from the Pennsylvania railroad as well as in the northwest corner 

 of the county. Limestones were seen on that railroad just west from 

 the Allegheny line at 35 to 48, 60 to 73, and 130 to 143 feet above the 

 Pittsburg, but they are irregular. At a mile south from the railroad the 

 limestones appear abruptly, the thick Benwood is at 65 feet above the 

 Pittsburg and 20 feet above the Lower Sewickley coal bed, while the 

 Fishpot is 15 feet thick and 20 feet above the Pittsburg coal. 



The section varies much in northern Washington and it must be fol- 

 lowed in detail from the West Virginia line eastward across JefEerson, 



VI — Bull. Geol. Soc. Am., Vol. 18, 1906 



