8 GEOLOGICAL SURVEY OF PENN'A. 



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

 See ±1 2 for oil boring at Cherry Tree, Cambria county. 

 See G 5 for oil boring in Wayne county. 



See Annual Report, 1885, for report of progress in the oil and gas region 

 with special facts relating to the geology and physics of natural gas. 

 See Grand Atlas, Div. Ill, Pt. I, under Bituminous Coal Fields. 

 See Annual Report, 1886. Part II. 



NORTH-EASTERN AND MIDDLE PENNSYLVANIA. 



{Palaeozoic formations from the Coal Measures 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. 



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. 



D 3. Vol. I. Report on Lehigh and Nobthampton counties. Introduc- 

 tion by J. P. Lesley ; Slate belt, by R. H. Sanders ; 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. 80, pp. 283, 1883. {Note.— For 

 atlas see below.) 



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. {Note.— For atlas see below. 



(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 con- 

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

 iron mines. 



(D 5.) Atlas of colored geological county maps of Cumberland, Frank- 

 lin, and Adams, {three sheets;) and first instalment of contour line map ol 

 the South mountains. Sheets A 1, A 2, B 1, B 2, {four sheets;) by A. E. 

 Lehman. 



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

 tingdon counties, by J. H. Dewees, and on the Aughwick valley and East 

 Broad Top region in Huntingdon county, by C. A. Ashburner. With col- 

 ored geological maps of East Broad Top R. R. and Orbisonia vicinity, (2 

 sheets;) Three Springs map and section, (2 sheets;) Sideling Hill Creek map 

 and section, (2 sheets,) and Isometric projection at Three Springs, (1 sheet ;) 

 six folded cross sections and 22 page plates of local maps and columnar sec- 

 tions. 80, pp. 305, 1878. 



F2. Report on Perry county, {Fart 7, geology,) by E. W. Claypole. 

 With two colored geological maps of the county ; 17 geological outline town- 

 ship maps as page plates, and 30 page plate cross and columnar sections. 8°, 

 pp. 437, 1884. 



G. Report on Bradford and Tioga counties, by A Sherwood ; report on 

 their coal fields, (including forks of Pine creek in Potter county, ) by F. Piatt ; 

 report on the coking of bituminous coal, by J. Fulton. {/See L above. ) With 



