DABTOS.] 



NORTH AMERICAN GEOLOGY. 



133 



Cambrian — Continned. 

 New York, Pennsylvamia, New Jer- 

 sey — Coutinaed. 



1878. Geology of Lake Champlain 



region, Hall, J. 

 Notes on analyses of dolomites 

 of Cumberland County, Pa., 

 Lesley. 



1879. Maofarlane's Gteological Rail- 



road Guide, New Jersey, 



Smock. 

 Macfarlane's Geological Rail- 

 road Guide, New York, Mac- 



farlane. 

 Macfarlane's Geological RaU- 



road Guide, Pennsylvania, 



Lesley, J. P. 

 Second report of laboratory of 



survey of Pennsylvania, Mc- 



Creath. 

 Report of geologist of New 



Jersey for 1879, Cook, G. H. 

 Clays and clay slates, Pennsyl- 

 vania, Frazer. 

 Geology of South Mountain, 



Pa., Frazer. 

 Lake Superior copper rocks 



in Pennsylvania, Blandy, 



Hunt, T. S. 



1880. Fossils in quartz rocks of lower 



Susquehanna, Frazer. 



Greologic action of humns acids, 

 Jnlien. 



■Western limit of Taconic sys- 

 tem. Ford. 



Relations of crystallines of east- 

 em Pennsylvania, Hall, C. E. 



On Atopa triiiniatus of Em- 

 mons, etc.. Ford. 



Zinc mines, Lancaster County, 

 Pa., Spilsbury. 



€i«ology of Lancaster County, 

 Pa., Frazer. 



Structure of Chicques rock, 

 Penusylvania, Frazer. 



Eec«nt investigations near 

 Poughkeepsie, N. Y., Dwight. 



1881. Unification of Silurian nomen- 



clature. Miller, S. A. 



Potsdam on South Valley Hill, 

 Pa., Lewis, H. C. 



Potsdam in Montgomery 



County, Pa., Rand. 

 Colonies dans les roches taconi- 

 ques des bords du lac Cham- 

 plain, Marcon, J. 



Cambrian — Continned. ' 

 Nkw York. Pexxsylvania, New Jbr- 

 SET — Continued. 



1881. Geology of Philadelphia 



County, etc.. Pa., Hall, C. E. ; 

 Lesley, J. P. 

 Analyses of minerals and rocks 

 of Bucks, PhUadelpbia, and 

 Montgomery counties, Pa., 

 Genth. 



1882. The Potsdam sandstone, Minne- 



sota, Winchell, N. H. 

 Report of survey of New Jersey 



for 1882, Cook, G. H. 

 Pure dolomite from Mount Alto 



district, McCreath. 

 Age of the Taconic system> 



Daua, J. J). 

 G^ologie du sudest de la Penn- 



sylvanie, Frazer. 



1883. Geology and copper of Adams 



County, Pa., Bailey, J. T.; 

 Frazer. 



History of Taconic question and 

 relation of Taconiau series. 

 Hunt, T. S. 



Progress of geology, 1882, Hunt, 

 T. S. 



Geologic history of the Ameri- 

 can continent, Hall, J. 



Geology of Berks County, Pa., 

 Invilliers, d'. 



Geology of Philadelphia 

 County, Pa., by HaU, l^ra- 

 zer. 



Fluidal cavities in quartz 

 grains, Merrill, G. P. 



Report C 4 of geological survey 

 of Pennsylvania, Frazer. 



Geology of the Chester A'alley 

 of Pennsylvania, Hall, C. E. 



Rand on Chester County, Fra- 

 zer. 



Geology of Philadelphia, Fra- 

 zer, Lewis, H. C. 



Limestone region and Pots- 

 dam sandstone, Lehigh and 

 Northampton Counties, Pa., 

 Prime. 



South Mountain gneiss, Penn- 

 sylvania, HaU, C. E. 



Geology of Lehigh and North- 

 ampton counties. Pa., Lesley, 

 J. P. 



Notes on Radnor, Pa., and vi- 

 cinity. Rand. 



