36 THE PHYSICAL TEATUKES OF PEIXCE GEORGE^S COUNTY 



1830. 



CoxEAD, T. A. On the Geology and Organic Remains of a part of 

 the Peninsula of Maryland. 



Jour. Acad. Nat. Sci., Phila., vol. vi, pt. 2, 1830, pp. 205-230, 2 plates. 



Deposits of Tertiary age about Piscataway and Fort Washington are 

 described and correlated with the London clay, upper marine. Several new 

 forms of fossils are described. On the basis of the fossils the Tertiary 

 deposits of these two localities are declared to be older than the Tertiary of 

 Calvert and St. Mary's counties. 



]\IoETO^^^ Samuel G. Synopsis of the Organic Remains of the Fer- 

 rngin on Sand Formation of the United States; with geological 

 remarks. 



Amer. Jour. Sci., vol. xvii, pp. 274-295; vol. xviii, pp. 243-250, 1830. 



The writer describes fossils from the green-sand marls of New Jersey, 

 from the Deep Cut of the Chesapeake and Delaware Canal, and from Mary- 

 land. The author contends that the green sands are pre-Tertiary in age and 

 should be correlated with the Lower Chalk of England. Eaton had claimed 

 that these beds were of Tertiary age. 



1832. 



CoxEAD^ T. A. Fossil shells of the Tertiary Formations of iSTortli 

 America illustrated by figures drawn on Stone from iSTature. Vol. 

 i, pts. 1 and 2, 28 pp. Phila., 1832. 



Republished by G. D. Harris, Washington, 1893. 



Cardita planicosta is reported from Middle Tertiary near Piscataway. The 

 stratum containing the fossil is supposed to be the equivalent of the London 

 clay and calcaire grossier. A gigantic Cucullaea and Ostrea compressirostia 

 are reported in similar material at Fort Washington. 



1833. 



Fiis'CH^ J. Travels in the United States of America and Canada. 

 8vo, 455 pp. London, 1833. 



The author speaks of the red sandstones at Bladensburg used for founda- 

 tions and of the red soil exposed in ravines in the city of Washington. He 

 describes the greensand marl at Fort Washington together with its contained 

 fossils. — Pecten, Cardium, Area, Ostrea, Ichthyosaurus, Crodiles, and Sharks. 

 He says that the marl is used as manure. 



Lea, Isaac Contributions to Geology. 8vo, 237 pp., 6 plates. 



Phila., 1833. 



The Tertiary deposits of Claiborne, Alabama, are fully described and are 

 correlated with the Fort Washington beds. 



