Prof. Johnson^s Report on the Bradford Coal Field. 137 



Art. XVIII. — Notice of a Report of a Geological, Mineralogical 

 and Topographical examination of the Coal Field of Carbon 

 creek, with an analysis of the Minerals, accompanied hy Maps, 

 Profiles and Sections ; by Walter R. Johnson, Civ. and Min. 

 Eng. and Prof, of Chem. and Nat. Phil, in Penn. Coll., Phila. 



We subjoin a notice of the valuable report of Prof. Walter R. 

 Johnson, v/hose title is given above. It announces a very impor- 

 tant deposit of coal, one among the many with which Pennsylva- 

 nia abounds and which mast long contribute to sustain domestic 

 arts and industry. 



In Bradford county, adjoining to the New York state line, 

 is the northeastern extremity of the range of bituminous coal 

 formations, which extend quite across the state from this point 

 to Somerset county on the borders of Maryland. It also termi- 

 nates the line of coal basins which, with perhaps some interrup- 

 tions, reach nearly the whole length of the state, on its north- 

 ern border. This coal deposit being now about to enjoy the ad- 

 vantage of a near connexion with the Pennsylvania public works 

 in progress along the north branch of the Susqnehannah river; 

 its situation is of great public interest to that portion of the state 

 of New York which adjpins Pennsylvania, near the head waters 

 of the Susqnehannah river, and indeed to the whole central por- 

 tion of New York, including the salt district, from which fuel 

 furnished by the forest is already so remote, as to become a con- 

 siderable drawback upon the profits of the manufacturer. The 

 consumption of four hundred thousand cords of wood per annum 

 in the manufacture of salt, must indeed require a vast extent of 

 country to be preserved in its wooded state, in order that the growth 

 should keep pace with the consumption. 



The geological character of the district traversed by Prof. John- 

 son, is similar to that of most other coal fields of Pennsylvania, 

 being a secondary formation, embracing a coal trough two or 

 three miles in breadth and of six or seven in length, its sonth- 

 western termination not being yet very accurately ascertained. 

 The attention of Prof. J. was limited to a district embracing 

 chiefly its northeastern portion. 



" Its northern or northwestern border is along a high and toler- 

 ably uniform and continuous ridge of mountain, lying south of the 



Vol. XXXIX, No. 1.— April-June, 1840. 18 



