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CATALOGUE AND INDEX OP 



[BULL. 127. 



Pennsylvania — Continued. 



1836. Geology of lakes and Mississippi 



Valley, Gibson, J. B. 



First report on survey of Penn- 

 sylvania, Eogers, H. D. 



Map of anthiacite coal fields, 

 Fisher. 



1837. Country between Baltimore and 

 [ Ohio, Aikin. 



"838. Position of coal formation in 

 Pennsylvania, Taylor, E. C. 

 Second report on survey of Penn- 

 sylvania, Rogers, H. D. 



1839. Corniferons lime rock as the line 



of reference in New York and 

 Pennsylvania, Eaton. 



Third report on survey of Penn- 

 sylvania, Eogers, H. D. 



Notes on American geology, Con- 

 rad. 



Eemarks on Bogers on the transi- 

 tion rocks, Silliman and Silli- 

 man. 



1840. Fourth report on survey of Penn- 



sylvania, Eogers, H. D. 

 Coal fields of Carbon Creek, 



Johnson, W. E. 

 On the Silurian system, Conrad. 



1841. Alleged unconformity in Carbon- 



iferous in Savage Mountain, 

 Trego. 



Bear Valley coal field, Johnson, 

 W.E. 



Southern coal fields of Pennsyl- 

 vania, Lea, M. C. 



Origin of overturns, Eogers, 

 H.D. 



Drift in Pennsylvania, Eogers, 

 H.D. 



Model of western Schuylkill coal 

 I fields, Taylor, E. C. 



Magneslan limestones, Eogers, 

 E.E. 



Fifth report on survey of Penn- 

 sylvania, Eogers, H. D. 



1842. Silurian and Devonian of the 



United States, Conrad. 



Sixth report of survey of Penn- 

 sylvania, Eogers, H. D. 



Geology of third district of New 

 York, Emmons, E. 



Nature of dip of Triassio of east- 

 ern United States, SiUimari, 

 EogerSj.H. D. 



Pennsylvania — Continued. 



1842. Structure of the Appalachians 



and laws of mountain chains, 

 Eogers and Eogers. 



Grooved surfaces of base of sec- 

 ondary, Eogers, H. D. 



Glaoiation of Pennsylvania, etc., 

 and origin of conglomerates, 

 Eogers, H. D. 



1843. Anthracite of Pine Grove, Lea. 

 Structure and contemporaneous 



origin of coals, Johnson, W. E. 



Structure of Appalachians, ex- 

 emplifying laws of mountain 

 chains, Eogers and Eogers. 



Distribution of fossils in the older 

 rocks, Hall, J. 



Geology of western district of 

 New York, Hall, J. 



Polishing of rocks and on parallel 

 valleys, Eogers, H. D. 



Origin of Appalachian coal, Kog- 

 ers, H. D. 



1844. American geology and condition 



of research in United States, 

 Silliman, Eogers, H. D. 

 Fossils near Sunbury, Johnson, 

 J.W. 



1845. Travels in North America, Lyell. 



1847. Parallelism of Paleozoics of North 



America with those of Europe, 

 Verneuil, Hall, J. 

 Distribution of remains in older 

 formations of the United States, 

 Hall, J. 



1848. Letters on geology, Christy. 

 Statistics of coal, Taylor, E. C. 



1849. Geology of Pennsylvania, Eogers, 



H.D. 

 Fussspuren im alten rothen Sand- 

 stein, Lea. 



1850. Origin of drift and terraces of 



aqueous action, Eogers, H. D. 



Structure of Appalachians com- 

 pared with the Alps, etc., Sog- 

 ers, H. D. 



Altered shales from New Hope, 

 Eogers, H. D. 



Absence of fossils in drift, Eog- 

 ers, H. D. 



Footprints in Carboniferous of 

 eastern Pennsylvania, Eogers, 

 H.D. 



Coal formation, especially in 

 Pcunsylvania, Eogers, H. D. 



