34 THE EOCEXE DEPOSITS OF MAEYLAXD 



Notes on American G-eology. Observations on characteristic 



Fossils, and upon a fall of Temperature in different geological epochs. 



Amer. Jour. Sci., vol. xxxv, 1839, pp. 237-251. 



Kefers to the Eocene deposits of Upper Marlboro and Piscataway as illustrations of 

 deposition by gentle currents. 



On the Silurian system, with a table of the strata and char- 

 acteristic fossils. Observations on the Plastic Clay. 



Amer. Jour. Sci., vol. xxxviii, 1840, pp. 91-92. 



The authors discusses the relations of the Plastic Clay to the fossiliferous deposits 

 at Piscataway, "which it is regarded in some instances to overlie. 



Observations on a portion of the Atlantic Tertiary region, 



with a description of new species of organic remains. 



Proc. IS^at. Inst. Prom. Sci., 2nd bull., 1842, pp. 171-194. 



The deposits of Upper Marlboro, Piscataway and Fort Washington are referred to 

 the Eocene or Lower Tertiary, and at the same time correlated with the London Clay, 

 Calcaire grossier, Claiborne beds, etc. The author also describes Ostrea seUaeformis 

 from City Point, Va., and Pholadomya marylandica and PhoJas petrofia fi'om Piscataway. 



— Observations on the Eocene formations of the United States, 



with descriptions of species of shells, etc., occurring in it. 



Amer. Jour. Sci., 2nd series, vol. i, 1846, pp. 209-220, 395-405, pis. i-iv. 



The article contains descriptions of PUolas jjetrosa, Pholadomya marylandica, Pan- 

 opaea elowjata, and Crassatella alaeformis from Piscataway, and Crassatella palmula 

 from Upper Marlboro. 



Observations on the Eocene formation and descriptions 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 author regards the Fort Washington, Piscataway and Upper Marlboro deposits 

 as lower Eocene. 



Observations on the Eocene formation and descriptions of 105 



new fossils of that period from the vicinity of Vicksbnrg, Miss. Appen- 

 dix: Descriptions of new Eocene fossils in the cabinet of Lardner 

 Vanuxem. 



Jour. Acad. Nat. Sci., Phila., 2nd series, vol. i, 1848, pp. 128-134, pi. xiv. 



The author considers the Maryland and Virginia deposits as " Lower or older 

 Eocene " and correlates them with the " fossiliferous sand of Claiborne and St. Steph- 

 ens, Ala.," etc., chiefly from the presence of 0. sellaeformis. He also describes 

 Cytherea suhimpressa, C. lenifi, C. Uciata. C. eversa, and Nticula imprncera from Hanover 

 County, Va. ; Cytherea py<ja from Stafford County, Va., and NuciUa pai-ilis from Upper 

 Marlboro. 



Notes on Shells. 



Proc. Acad, Nat. Sci. Phila., vol. vi, 1853, p. 320. 



Cytherea lenticularis Kogers is referred to the genus Artcmif^ of Poli. 



