MARYLAND GEOLOGICAL SURVEY 41 



Conrad, T. A. Observations on a portion of the Atlantic Tertiary 

 Region, "with a description of new species of organic remains. 



Second Bull. Proc. Nat. Inst. Prom. Sci., 1842, pp. 171-192. 



The deposits of the Eocene at Piscataway, Upper Marlboro, and Fort 

 Washington are described and their characteristic fossils mentioned. They 

 are correlated with the Bognor rocks of Great Britain and the Claiborne beds 

 of Alabama. 



The Miocene and Eocene are said to not be connected by a single fossil 

 common to both periods while three fornia found in the Upper Secondary are 

 found in the Eocene. 



1843. 



DucATEL, Julius T. Physical History of Maryland. 



Abstract Proc. Amer. Phil. Soc, vol. iii, 1843, pp. 157-158. 



"The Eastern Shore is shown to consist of something more than arid sand- 

 hills and pestilential marshes; and the Western Shore not to depend exclu- 

 sively upon the rich valleys of Frederick and Hagerstown for its supplies." 



1841. 

 B(ailey), J. "W. Account of some Xew Infusorial Forms discov- 

 ered in the Fossil Infusoria from Petersburg, Va., and Piscataway, 

 Md. 

 Amer. Jour. Sci., vol. xlvi, 1844, pp. 137-141, pi. iii. 

 Ten species are described and over 30 figures given. 



Ehrenberg, C. G. Ueber zwei neue Lager von Gebirgsmassen 

 aus Infusorien als Meeres-Absatz in Xord Amcrika und cine Ver- 

 gleichung derselben mit dem organischen Kreide-Gebilden in Europa 

 und Afrika. 



Bericht. k. p. akad. Wiss. Berlin, 1844, pp. 57-97. 



Reviewed Amer. Jour. Sci., vol. xlviii, 1845, pp. 201-204. 



Sixty-eight species of infusoria are enumerated from Piscataway including 

 a great many new forms. Comparisons are made with the diatoms occurring 

 at Richmond and Petersburg, Virginia, and in Europe and Africa. 



Eogers,, H. D. Address delivered at the Meeting of the Associa- 

 tion of American Geologists and Naturalists. 



Amer. Jour. Sci., vol. xlvii, 1844, pp. 137-160, 247-278. 



The article consists of a resume of the geological work done up to that 

 time in the entire United States. Reference is made to Conrad's work on the 

 Eocene fossils found at Upper Marlborough and Bailey's investigations on 

 the infusoria near Piscataway. 



