Lesley.] lOO [March 7, 



by Mr'. Henry Harden, C. E., and described the geological 

 features of that part of the basin portrayed by the map. 



Mr. Lesley also described the geological facts of most 

 interest recently studied by Mr. Franklin Piatt and Mr. 

 John H. Harden, C. E., on Dunning's Creek, Bedford 

 County, Pennsylvania, and compared the exhibition of the 

 Fossil Ore beds of No. V (Clinton Group, Upper Silurian) 

 with that of the same deposit at Frankstown, Danville and 

 other points in Pennsylvania. 



Mr. Price introduced the subject of a Geological Survey 

 of Pennsylvania, which led to its discussion by Prof. Trego 

 and other members present. 



Prof. Chase placed on record, with explanatory remarks, 

 four notes: 1, on Planeto-taxis; 2, on the rotation of the 

 Sun and interasteroidal planets; 3, on the special planetary 

 relations to the Sun-spot period; 4, on the relative velocity 

 of light and gravity. 



Pending nominations Xos. 715 to 728, and new nomina- 

 tions Nos. 729 to 732, were read. 



And the meeting was adjourned. 



ST. CLAIRSVILLE AND BEDFORD RAILROAD; AND DUN- 

 NING'S CREEK FOSSIL IRON ORE. 



By Professor J. P. Lesley. 

 (Bead before the Americtin Philosophical Society, March 7, 1873.) 



Mr. Franklin Piatt has recently made for me a topographical and 

 geological survey and sketch-map of some valuable deposits of iron ore in 

 Bedford county, Pennsylvania; and Mr. John W. Harden a special study 

 of the same with a view to the best way and probable expense of mining 

 the ores. I have had the map ithographed, as an illustration of the 

 characteristic features of the outcrop of the Upper Silurian rocks, which 

 borders on the east the Bituminous Coal Field of Western Pennsylvania 



In front of the Allegheny Mountains, which runs for a hundred miles 

 in nearly a straight (N. E. and S. W. ) line from Muncy to opposite Bed- 

 ford, lies a long, narrow, straight, deep valley, about five miles wide, 

 occupied successively by the West Branch Susquehanna, the Bald Eagle 

 Creek, the Little Juniata, the south head of the Juniata river, and finally 

 by Dunning's Creek, which flows southwest and joins the Raystown 

 Juniata at Bedford. 



