42 THE PHYSICAL FEATURES OF PRIXCE CxEOEGe's COU^N'TY 



Rogers^ Wm. B. [Tertiai'v Infusorial Formation of Maryland.! 



Amer. Jour. Sci., 2nd ser., vol. xlvi, 1844, pp. 141-142. 



A short description of the geographical extent of the infusorial stratum is 

 given. He places the deposits near the base of the "Meiocene." Names of 

 infusoria identified by Professor Bailey are given. 



1845. 

 Bailey^ J. W. Notice of some Wew Localities of Infusoria, Yo^- 

 Al and Recent. 

 Amer. Jour. Sci., vol. xlviii, 184.5, pp. .321-343, pi. iv. 



Gives lists of forms found in Eocene marl of Fort Washington and in 

 Miocene deposits near Piscataway. Casts of Polythalamia are reported from 

 Fort Washington. 



1846. 

 Conrad, T. A. Observations on the Eocene Formation of tins 

 United States, with descriptions of species of shells, etc., occurring 

 in it. 



Amer. Jour. Sci., 2nd ser., vol. i, 1846, pp. 209-221, 395-405, pis. i, ii, iii, iv. 

 Following fcssils are described from Piscataway: Pholas petrosa, Phola- 

 domya Marylandica, Panopaea intermedia, Crassatella alaeformis, and 

 Crassatella palinula from Upper Marlborough. 



1847. 



Conrad, T. A. Observations on the Eocene Formation and descrip- 

 tion of one hundred and five new fossils of that period from the 

 vicinity of Vicksburg, Mississippi. With appendix. 



Proc. Acad. Nat. Sci. Phila., vol. iii, 1847, pp. 280-299. 



The writer regards the Eocene deposits of Prince George's County as 

 Lower Eocene and the Claiborne, Charleston, and Vicksburg beds as Upper 

 Eocene. 



1848. 



Conrad, T. A. Observations on the Eocene Formation and descrip- 

 tions of one hundred and five new fossils of that period from the 

 vicinity of Vicksburg, Mississippi, with an appendix. [Description 

 of 'New Eocene Fossils in the cabinet of Lardner Vanuxem.] 



Jour. Acad. Nat. Sci. Phila., 2nd ser., vol. i, 1849, pp. 111-134, pis. 11-14. 



The Fort Washington, Piscataway, and Upper Marlborough Eocene deposits 

 referred to the Lower Eocene are correlated with the Alabama deposits at 

 Claiborne and St. Stephens because of the presence of Ostrea seUaeformis. 

 Mention is made of several Eocene species from this county. 



