Jan. 19, 1883.] Oo7 [Lesley. 



Note on the progress of the Second Geological Survey of PennsyUania. By 

 J. P. Lesley. 



(Bead before the American Philosophical Society, Jan. 19, 1SS3.) 



The progress of the Geological Survey of this State, which interests so 

 many of my fellow-members, both in America and in foreign countries, 

 deserves some record on the minutes of this Society, the mother society 

 of our country, and in former times the natural rendezvous of American 

 physical and mechanical science. 



I venture then to offer to the Society the following short account of the 

 ground already covered by the survey, as exhibited by its publications 

 since 1875, county by county, in alphabetical order ; with occasionfll notes 

 respecting those counties in which further field work must be done before 

 reports upon them can be made ready for the press. 



It is needless to say, that the already collected data withheld as yet from 

 publication for this purpose must be added to express the sum total ot 

 actual work done in the State. 



Adains County. Surveyed in 1874 and 1875 by P. Frazer. See Re- 

 port C on Adams and York (1876), and Report CC on Adams, York, 

 Cumberland and Franklin (1877). JVote. — Instrumental lines were run 

 in both counties. The special topographical survey of the the South 

 mountains in Franklin and Adams, commenced in 1876, was continued 

 through 1877, 1878, 1879, 1880, northwards to'Pinegrove furnace. In 

 1881 and 1882 this survey was carried forward in Cumberland and York 

 counties towards Mount Holly Springs ; and in 1883 it will be nearly or 

 quite completed, to the end of the mountain range at Dillsburg. Four 

 sheets have been printed, but will not be published until the remaining 

 sheets of the South Mountain map are also printed. The whole will then 

 be published in atlas form with a report, and in rolls for the use of sur- 

 veyors. 



Allegheny. Surveyed in 1875 and 1876 by J. J. Stevenson and I. C. 

 White. See Report K on Greene, "Washington and South-west Allegheny 

 counties (1876) ; Report KK on Fayette, "Westmoreland and eastern 

 Allegheny (1877) ; Report Q on Beaver and N. W. Allegheny (1877). 



Armstrong. Surveyed in 1879 by W. G. Piatt. Report H 5 (1880). 



Beaver. Surveyed in 1876 by I. C. White. See Report Q (1877). 



Bedford. Surveyed in 1881 by J. J. Stevenson. Report T 2 (1882). 



Berks. Surveyed in 1880 by R. H. Sanders. A geological map of 

 the limits of the formations and the dip and strike of all exposed rocks in 

 the valley is prepared, but not yet published. The sheets of the great 

 topographical survey of the limestone belt and mountains of Lehigh and 



