DUNKARD FORMATION 113 



Feet Inches 



1. Massive sandstone - 10 



2. Concealed 25 



3. Jollytown limestone Thin 



4. Concealed 15 



5. Jollytown coal bed 2 2 



6. Concealed 20 



7. Upper Washington limestone 4 



8. Concealed 80 



9. Middle Washington limestone 2 



10. Concealed HO 



11. Limestone and shale 2 6 



12. Washington coal bed 3 6 



13. Concealed , 10 



14. Shales 63 



15. Waynesburg A coal bed 2 



16. Waynesburg sandstone 45 



17. Waynesburg coal bed. 



The thicknesses are probably extreme, as separate sections have been 

 combined to obtain the details. The correlations above the Washington 

 coal bed are to be taken only as tentative; those which seem more prob- 

 able have been given on a preceding page. The Washington coal bed 

 retains the features characterizing it at western exposiTres, as appears 

 from the diagrams given in the reports.'' 



* 



EAST FROM THE MONONGAHELA RIVER, IN PENNSYLVANIA 



No Dunkard beds have escaped erosion in the First and Second bitumi- 

 nous basins of Pennsylvania; but west from Chestnut Eidge to the 

 Monongahela they are found in somewhat widely separated patches, at 

 times embracing several square miles. The rocks belong to the lower por- 

 tion of the column and are soft, so that exposures as a rule are very poor 

 and the information is scanty. 



In the Blairsville-Connellsville trough one finds traces of the Waynes- 

 burg sandstone at almost the northern extremity, near the Conemaugh 

 river. Farther south, in Unity of Westmoreland county, that sandstone 

 is 40 feet thick, and in Mount Pleasant the section reaches to what seems 

 to be the Colvin limestone. South from the Youghiogheny river, in 

 Fayette county, the Washington coal bed, 4 feet thick, is shown at one 

 locality where the hills are high enough to catch the Upper Washington 

 limestone. The Waynesburg sandstone is distinct to at least 14 miles 

 south from the river, beyond which its place is not reached. 



* C. C. O'Harra : Allegany county, p. 129. 

 G. C. Martin : Garrett county, pp. 144, 145 ; vol. v, p. 258. 

 W. B. Clark et al. : Vol. v, pp. 312, 313, 314, 406, 407. 



