72 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



In southern Butler a well on Thorn creek, about midway east and west 

 in the county, shows 220 feet of sandstone at the bottom,* while a record 

 in the extreme southeast part, near the Allegheny river, shows 



Feet 



Homewood 65 



Mercer '. 103 



Upper Connoquenessing. . . , 75 



Quakertown shale 40 



Sandstone 200 



A coal bed, the Tionesta, is here at 8 feet below the Homewood, and 

 much black sand is present in the lower portion of the Mercer. The 

 great mass of sandstone below the Quakertown represents the Lower 

 Connoquenessing and the Sharon shales and sandstone, with, as in 

 Butler, perhaps some beds of greater age. 



At New Brighton, in Beaver county, the section is 



Feet 



Homewood 53 



Tionesta coal bed 1 



Mercer group , 112 



Upper Connoquenessing 41 



Quakertown shales 40 



Lower Connoquenessing 50 



The Mercer and Quakertown coals are not reported. A record in 

 southeastern Beaver shows an extraordinary thickening of the Home- 

 wood sandstone similar to that already mentioned as observed near 

 Homewood in this county. The thickness is 120 feet, the increase being 

 at the expense of beds belonging to the Allegheny formation, as the Fer- 

 riferous limestone is but 17 feet above the Homewood. The lower sand- 

 stones at this locality have thickened greatly, but at the expense of the 

 shales, as the total thickness is nearly the same. 



Allegheny county is south from Butler, with southern Beaver at the 

 west and Westmoreland at the east. In the northwestern part of the 

 county, near the Beaver border, two records from wells barely a mile 

 apart give 



Feet, Feet 



Homewood sandstone 17 12 



Mercer group 31 32 



Upper Connoquenessing 34 61 



Quakertown shales 63 50 



Sandstone 246 240 



* J. F. Carl] : Ann. Rep. 2d Geol. Sm v. Penn. for 1886, pp. (i-18, 649, 050. 



