PETROLEUM AND GAS. 



See reports I, I 2, 1 3, I 4, and J under Bituminous Coal Fields. 

 See L, for the Pittsburgh gas well, and the use of gas in the iron manufacture. 

 See Q, Q2, Q3, Q4, for references to oil rocks in Beaver, Lawrence, Mercer, 

 Crawford, Erie, and S. Butler counties. 

 See K for the Dunkard creek oil wells of Greene county. 

 See R, R2, for descriptions of oil rocks in McKean, Elk, and Forest counties. 

 See V, V 2, for notes on the oil rocks of N. Butler, and Clarion counties. 

 See H 2 for oil boring at Cherry Tree, Cambria county. 

 See G 5 for oil boring in Wayne county. 



NORTH-EASTERN AND MIDDLE PENNSYLVANIA. 



(Palaeozoic formations from the Coal down.) 



D. First report on Lehigh county iron mines, by F. Prime. With a con- 

 tour line map of the ore region, and 8 page plates. 8°, pp. 73, 1875. Price in 

 paper $0 50, postage $0 04. 



D 2. Second report on Lehigh county iron mines, by F. Prime. With a 

 colored geological contour line map of the iron region, (in 4 sheets,) a colored 

 geological contour line map of the Ironton mines, 4 double page lithograph 

 pictures of Limestone quarries, and one page plate of Monocraterion. 8°, 

 pp. 99, 1878. Price $1 60, postage $0 12. 



D 3. Vol. 1. Report on Lehigh and Northampton counties. Introduc- 

 tion, by J. P. Lesley ; Slate belt, by R. A. Saunders ; Limestone belt and iron 

 mines, by F. Prime ; South mountain rocks, by F. Prime and C. E. Hall. 

 With 3 lithograph pictures of quarries, 4 pictures of triangulation stations, 14 

 page plates of sections, and an atlas of maps. 8°, pp. 283, 1883. Price $0 65, 

 postage $0 13. (Note, for atlas see beloiv.) 



D 3. Vol. II, part I. Report on Berks county, (South Mountain belt,)by 

 E. V. D'Invilliers. With 10 page plates of sections and Indian relics, and 3 

 pictures of rock exposures. 8°, pp. 441, 1883. Price $0 55, postage $0 18. 

 (Note, for atlas see below, as be/ore.) 



(D 3.) Atlas: One colored geological map of Lehigh and Northampton 

 counties, (one sheet); one colored geological contour line map of Southern 

 Northampton county, (six sheets); a contour line map of the mountains from 

 the Delaware to the Schuylkill, (eighteen sheets); a colored geological contour 

 line index map to the 22 sheets, (one sheet); and 4 sheets of maps of Iron 

 mines. Price of Atlas $2 80, postage $0 17. 



D 5. A i i, as of colored geological county maps of Cumberland, Frank- 

 lin, and Adams, (three sheets): and first instalment of contour line map of 

 the South mountains, Sheets A 1, A 2, Bl, B2, (four sheets,) by A. E. Lehman. 

 Price of Atlas $1 25, postage $0 08. 



F. Report on the Juniata river district in Mifflin, Snyder and Hun- 

 i in'. don counties, by J. H. Dewees ; and on the Aughwick valley and East 

 Broad Top region in HUWTINGBOH county, by C. A. Ashburner. With 

 colored geological maps of East Broad Top R. 11. and Orbisonia vicinity 

 (2sheeta); Three Springs map and section (2 sheets); Sideling Hill creek 

 map and section ('J sheets); and Isometric projection at Three Springs (1 

 sheet); six folded cross sections and 1>'J page plates of local maps, and col- 

 umnar section* 8°, pp. 305, 1878. Price f2 55, postage $0 20. 



