MARYLAND GEOLOGICAL SURVEY 37 



1834. 



Coi^RAD, T. A. Observations on tlie Tertiary and more recent for- 

 mations of a portion of the Sonthern States. 



Jour. Acad. Nat. Sci., Phila., vol. vii, 1834, pp. 116-129. 



The author uses the term "Eocene" in describing the deposits at Fort 

 Washington. He states that the Eocene strata extend to the southwest from 

 Maryland, but considers the deposits of Maryland as younger than those of 

 Claiborne, Ala., and probably to be correlated with the miocene of Europe. 



DucATEL, J. T., and Alexander^ J. IT. Report on the Projected 

 Survey of the State of Maryland, pursuant to a resolution of the Gen- 

 eral Assembly. 8vo, 39 pp. Annapolis, 1834. Map. Several editions. 



Amer. Jour. Sci., vol. xxvii, 1835, pp. 1-39. 



Shell marl deposits are reported to occur at Indian Point, on the western 

 branch of the Patuxent River, at "Upper Marlborough," and at Fort Wash- 

 ington. The deposits at the latter place are said to have no practical value. 

 Copperas ore (iron pyrites) is said to occur at Oxen Creek and bog iron ore 

 in the neighborhood of Queen Anne (Hardesty) ; while carbonate of iron ore 

 is described from "Snowden's mine bank, situated on the east side of the 

 Washington Turnpike, near the twenty-first mile stone and about half a mile 

 from the road. "The ore was formerly extracted from this bank in large 

 quantities, as is evident from the excavation." 



Harlan", Richard. Critical ^STotices of Various Organic Remains 

 Hitherto Discovered in Xorth America. (Read May 21, 1834.) 



Trans. Geol. Soc. Pa., vol. I, pt. L 1834, pp. 46-112. 



The author states that specimens of Egiius callabus were "found in exca- 

 vating for the Chesapeake and Ohio Canal near Georgetown, D. C, not far 

 from the Potomac River." (p. 61.) 



MoRTOx, S. G. Synopsis of the Organic Remains of the Creta- 

 ceous Group of the United States. To which is added an appendix 

 containino' a tabular view of the tertiarv fossils hitherto discovered 

 in Xorth America. Svo, 88 pp. Phila., 1834. 



(Abst.) Amer. Jour. Sci., vol. xxvii, 1835, pp. 377-381. 



He states that the "Ferruginous Sand" is present at Fort Washington, 

 where it contains exogyra. 



