16 Notes on the Coal Measures of 



of supply for some distance along the Darlington road. It 

 is rarely used where other coals are accessible. 



The Freeport Limestone is here a pure white limestone, 

 and very persistent. It would burn into lime of excellent 

 quality, but is not employed for that purpose, or indeed for 

 any other. The original settlers discovered the impure 

 Ferriferous limestone and burned that. Their descendants 

 have continued to use that rock in preference to the Free- 

 port ; for what reason, it is difficult to say. 



The lower portion of No. 16 is fossiliferous, and yielded 

 large numbers of individuals belonging to the following 

 species : Product us semi-reticulatus, P. JVebrascensis, P. cos- 

 tatus (?), P. Prattenianus, Spirifer plano-convexus, Athy- 

 ris subtilita, and spines of Zeacrinus mucrospinus. 



The thin coal, No. 15, is a persistent member of the 

 group, but is not mentioned in Rogers' report. It is of fair 

 quality. 



The shale No. 14 is quite rich in vegetable remains, prin- 

 cipally of the genera Pecopteris, Sphenophyllum, Neurop- 

 teris, Hymenophyllites, Catamites, and Sigillaria. 



The Lower Freeport Goal nowhere attains workable thick- 

 ness along the line of section, excepting at one locality on 

 Trough Run, where it suddenly expands to four feet, and be- 

 comes an impure canuel of little value. 



The Kittanning Coal is the important bed in this portion of 

 the county, and is mined somewhat extensively, not only to 

 supply the home demand, but also for shipping. It is quite 

 pure, is an excellent gas coal, and cokes readily. It is rarely 

 more than thirty-two inches thick, and never more than three 

 feet, in this region, yet owiug to its quality it is profitably 

 mined for shipment on a large scale. At Clinton, ten miles 

 above New Brighton, the Crawford mine yields two hundred 

 tons daily, and there are others almost as productive. In 

 the vicinity of New Brighton and Beaver Falls, the seam 

 shows the same thickness and is of equally good quality, 

 but is mined neither extensively nor intelligently. No more 



