Kn )X()MICAL GEOLOGY. 47 



No. Ft. In. 



Total depth 769 



The drift at Hillsboro was found to be 123% feet in thickness. 

 and contains some very clean beds of gravel near the bottom, 

 which outcrop at the base of the hill near the railroad depot. 



The stratum, numbered 35, is probably coal No. 6, which 

 holds about its average position here below the Shoal Creek 

 limestone. Coal Xo. 8 belongs above the fire clay No. 16 of the 

 section, but no bituminous matter seems to have been brought 

 up from that horizon by the drill. 



From an examination of the core taken from the bottom of 

 this boring, it was evident that it had penetrated the Chester 

 division of the Lower Carboniferous, the purple shale and argil- 

 laceous limestone of that formation, being readily recognized. 

 A portion and possibly the whole of the sandstone No. 51 of 

 the record, and the underlying limestone. No. 52, belong to 

 that horizon. 



