MONONGAHELA FORMATION 



57 



Important mining operations in German and Eedstone townships 

 have led to making many shafts and borings, which exhibit conditions 

 unsuspected from the surface exposures. Four of these from a small 

 area may be compared. 



I, Brier Hill shaft; II, Hibbs farm boring; III, Edenton shaft ; IV, Lambert shaft. 







Feet 



1. 



Waynesburg coal 



5.3 



2. 



Sandstone fireclay 



14 



3. 



Little Waynesburg coal . . . 



3.5 



4. 



Waynesburg limestone 



10.6 



5. 



Interval 



47.5 



6. 



Uniontown coal bed 



4.2 



7 



Interval 



7.8 



8. 



Uniontown limestone .... 



8.8 



Q 



Interval 



7.9 



10. 



Benwood limestone 



121.2 



11 



Interval 



2.3 



12. 



Upper Sewickley coal 



3.4 



13. 



Sandstone, shale 



86.1 



14. 



Lower Sewickley coal 



0.0 



15. 



Interval 



0.0 



16. 



Fishpot limestone 



24.3 



17 



Intei'val 



21.4 



18. 



Redstone coal 



0.0 



19. 



Interval 



0.0 



20. 



Redstone limestone 



16.0 



21. 



Interval 



0.0 



?^ 



Pittsburg coal 







Coal and shale 



7.8 





Shale, fireclay, black shale 



23.7 





Main coal 



7.0 



Feet 



Feet 



Feet 



7 



6 



8 





' 23 



33 





4 



0.2 



69 < 



3 



55 



31 



4 





2 



2 





1^28 



2 



^1 







23 C 



i 0£i \ 



120 



159 



2 



5 







1 



0.8 



Trace 



28 



38 



27 

 2 



, . 



, , 



3 



18 



21 



18 





p9 



1 



21 



51 ' 



1 



3 









112 



15 



22 





23 



45 



f 2.6 

 1 20.6 



7 



7 



7 



The interval from Waynesburg to Pittsburg varies between 360 and 

 380 feet. The Benwood and Uniontown limestones are continuous in 

 the Lambert shaft, where the mass contains only 3 feet of sandstone^ 

 and they are almost continuous in the Brier Hill, where, however, there 

 is a much greater amount of shale and sandstone. The Eedstone and 

 Fishpot limestones retain their importance. The interesting feature is 

 the wide separation of the parts of the Pittsburg coal bed, recalling con- 

 ditions already observed in the Potomac, Salisbury, and Connellsville 

 areas. The intervening 22 feet in the Hibbs boring is filled with car- 

 bonaceous shale, but in the other records a thin sandstone is reported. 

 The interval from the Upper Sewickley to the Pittsburg main coal is 

 from 139 to 112 feet, and the Sewickley sandstone is sometimes only a 



