DAETON.] 



NORTH AMERICAN GEOLOGY. 



731 



Pennsylvania — Continued. 



1871. Gas wells of Ohio and Pennsyl- 



vania, Newberry. 



Boring records from the anthra- 

 cite basin, Sheafer. 



Plication of anthracite basins 

 Rothwell. 



Section across the AUeghauies to 

 illustrate plication, Lesley, J. P. 



Pennsylvania's foundation stones, 

 Leeds. 



1872. History of Cambrian and Silu- 



rian, Hunt, T. S. 



Corundum mine, Leidy. 



Notes on West Virginia, Steven- 

 son. 



1873. Map of United States, Hitchcock, 



C. H. ; Hitchcoclk; and Blake. 



Structure and erosion of Brush 

 Mountain, Lesley, J. P. 



Corundum, its alterations and as- 

 sociates, Genth. 



St. Clairsville and Bedford Rail- 

 road and Dunnings Creek fossil 

 ore, Lesley, J. P. 



Violation of lawof debituminiza- 

 tion of coals, Lesley, J. P. 



Record of oil wells, Armstrong 

 County, Lesley, J. P. 



Mines of Lehigh Zinc Company, 

 Uriuker. 



Iron ores of South Mountain, 

 Lesley, J. P. 



Iron ore of Bucks County, Lesley, 

 J. P. ; Trego. 



Structure and erosion of Brush 

 Mountain, Lesley, J. P. 



Hematite of South Mountain, 

 Harden, J. AV. 



Hematite in Morrison Cove, Les- 

 ley, J. P. 



1874. Upper coal measures west of the 



AUeghanies, Stevenson. 



Gardner oil wells. East Sham- 

 burg, Hall, J. 



Alleghany coal fields, Whittlesey. 



Circles of deposition, Newberry. 



Thin sections of Paleozoic and 

 Mesozoio rooks, Frazer. 



Map of coal fields of the United 

 States, Hitchcock, C. H. 



Steinkohlen der Vereinigten 

 Staaten, Macfarlane. 



1875. Structures of Tork Valley lime- 



stones, Frazer. 



Pennsylvania — Continued. 

 1875. Thin sections of traps, Frazer. 



Section from Alleghany Mountain 

 to Brush Valley, Fagen and 

 Young. 



Geologic chart of the United 

 States, Bradley, F. H. 



Coal and oil measures in Law- 

 rence County, Lesley and Les- 

 quereux. 



Character of slates at outcrop, 

 Frazer. 



Triassic of York County, Frazer. 



Comparative geology of north- 

 eastern Ohio, northwestern 

 Pennsylvania, and western New 

 York, Lesley, J. P. 



Coal beds in sub-Carboniferous, 

 Lesley, J. P. 



Hematite of eastern United States, 

 Hunt, T. S. 



Comparison of Alleghany coal 

 fields, Andrews. 



Minerals of southwestern Penn- 

 sylvania, Perkins. 



Report on iron ranges of Lehigh 

 County, Prime. 



Hematite deposits of the Great 

 Valley, Prime. 



Report on Venango oil district, 

 Carll. 



Report in Clearfield and Jeiferson 

 coal district, Piatt, F. 



Geology around Warren, Randall. 



Hydro-geology, Frazer. 



Report of laboratory of survey 

 of Pennsylvania, MoCreath. 



Section of oil wells, Butler, Arm- 

 Strong, and Clarion counties, 

 Lucas. 



Geography and geology of petro- 

 leum, Wrigley. 



The ores of iron ; their distribu- 

 tion, Newton. 

 1876. Coal and oil of United States, 

 Boyd, E. F. 



Age and origin of quartz veins, 

 Frazer. 



Weathering of trap, Frazer. 



Durability of natural gas supply, 

 Piatt, F. 



Boyds Hill gas weU, Lesley, J. P. 



Fish remains in Mesozoic shales, 

 Leidy. 



Coal measures of the Yonghio- 

 gheny, etc., Piatt, F. 



