DABTON.] 



NOETH AMERICAN GEOLOGY. 



873 



Silurian — Continued. 

 Appalachian— Continued. 



1884. Reprint of reports on geology 



of the Virginias, Rogers, W.B. 

 Analyses of ores and limestones, 



Pennsylvania, Genth. 

 Pennsylvania building stones, 



Lesley, J. P. 

 Maryland building stones, 



Huntington, Munroe and 



Singleton. 

 New Jersey building stones, 



Cook and Smock. 

 Helderberg limestones east of 



the Catskills, Davis, W. M. 

 Notes on Natural Bridge of Vir- 

 ginia, Ashburner. 

 Unconformity of Upper and 



Lower Silurian, Cook, G. H. 



1885. Map of Adams, Franklin, and 



Cumberland counties, Pa., 

 Lesley, J. P. 



Progress of geology, 1883, Hunt, 

 T. S. 



Pennsylvania before and after 

 elevation of the Appalachians 

 Claypole. 



Great fault, Schodack Landing, 

 N. Y., Ford. 



Geologic atlas of counties of 

 Pennsylvania, Lesley, J. P. 



Handbook of Virginia, Harri- 

 son. 



Taconio System, Mareou, J. 



Notes on Tazewell, Russell, 

 Wise, Smith, and "Washing- 

 ton counties, Va., Stevenson. 



Notes on metamorphism, Ste- 

 venson . 



Devonian of Green Pond Moun- 

 tain, N. J., Darton. 



History of Taconic question, 

 and relations of the rooks, 

 Hunt, T. S. 



Highland County, Va., Camp- 

 bell, J. K. 



Rogers's geology of the Virgin- 

 ias, Campbell, J. L. and H. D. 



Trap dike across southeastern 

 Pennsylvania, Lewis, H. C. 



Report of State geologist of 

 New Jersey for 1885, Cook, 

 G. H. 



Bone cave in Pennsylvania, 

 Daiton. 



Silurian — C ontinued. 

 Appalachian — Continued. 



1885. Materials of the Appalachians, 



Claypole. 

 Fossils in Hudson slates, 



Orange County, N.Y., Darton. 

 Crystallines of Alabama, 



Hitchcock, C. H. 

 Division du systfeme ^ozoique. 



Hunt, T. S. 

 Taconic rocks and stratigraphy, 



Dana, J. D. 

 Geology of Huntingdon County, 



Pa., Lesley, J. P. ; White,!. C. 

 Natural Bridge of Virginia, 



Ashburner. 

 Arohean-Paleozoic contact in 



southeastern Pennsylvania, 



Frazer. 

 Fossil ore in Huntingdon 



County, Pa., Billin. 

 Pteraspidian fishes in Upper 



Silurian, Pennsylvania, Clay- 

 pole. 

 Map of the United States, 



McGee. 

 Gypsum deposits in Cayuga 



County, N. Y., Williams, S. G. 

 Amount of chemical erosion in 



limestones of Center County, 



Pa., Ewing. 

 Glaciatiou of Shawangunk 



Mountain, New York, Julien. 

 Geology of Highland County, 



Va., Hotchkiss. 

 Age of rocks near Schenectady, 



N. Y., Ford. 

 Age, character, and origin of 



gypsum of Cayuga County, 



N. Y., Willia,ms, S. G. 

 Fish remains in Silurian of 



Pennsylvania, Claypole. 

 Letter on Nittany Valley ores, 



d'Invilliers. 

 Perry County, Pa., Claypole, 



Dewees, Lesley, J. P. 



1886. Silurian fossils in Emmons's 



Taconic, Dana, J. D. 



Fossiliferous Potsdam at Pough- 

 keepsie, N. Y., Dwight, W. B. 



Scorpion from Silurian of 

 America, Whitfield, R. P. 



Taconic controversy in u, nut- 

 shell, Winchell, N. H. ; Dar- 

 ton.. 



