BULL. GEOL. SOC. AM. 



m 



mr 



10 



-111 



VOL. 13, 1901, PL. 

 Conemauqh formation (26-4 

 Allegheny formation 

 25 25 Upper Freeport coal 



22 2:1 Upper Freeport sandstone 



22 Lower Freeport coal 



•a Lower Freeport limestone 



18 20 Lower Freeport satnlsrone 



19 Upper Kittanning coal 



15 Middle Kittanning coal 

 17 17 Lower Kittanning coal 



16 "Split-six" coal 





13 Clarion 



sandstone 



12 



12 Clarion 



coal 



10 



11 Brookv 



Pottseilte fr 



rmation (1- 



COLUMNAR 



(Bore-hole) west of ( 



(Bore 



Scale : 1 inch =loo feet 

 TIONS OF THE ALLEGHENY FORMATION 



