68 



Pittshuro-Ji Coal Strcxta. 



poor quality. It would be interesting to know whether stratum 

 No. 3. is the same bed which appears at Beaver, Steubenville and 

 Wheeling. It is more than probable it is so, as the general dip is 

 towards the S. and S. W., and the coal very similar, yet I conjec- 

 ture it is a lower stratum, perhaps No. 4." 



The specific gravity of the coal from bed No. 3. at Morgantown 

 and Brownsville, is 1.30. It contains nearly sixty per cent, of 

 charcoal, twenty grains of the coarse powder decomposing 100 

 grains of nitre, showing it to be a superior coal for coaking. 



Section of Coal HiW at Pittsburgh, (Pa.) at the mouth of the 

 Monongahela River. 



Order descending.— Slight dip to the S. or S. E. 



No. 11. 



Ohio River. S 



1. Reddish brown argillaceous earth, intermixed VN^ith fragments 

 of limestone ; affording a strong soil for cultivation. — 20 feet. 



