22 PHYSIOGRAPHY AND GEOLOGY OF THE COASTAL PLAIN PROVINCE. 



1835 



Clemson, Thomas G. Notice of a Geological Examination of the 

 Country between Fredericksburg and AVinchester in Virginia, including 

 the Gold Eegion. 



Trans. Geol. Soc. of Penn., vol. i, pp. 298-313, Phila., 1835. 



The lithologlcal characters of the Potomac deposits in the region of Frederlclssburg 

 are described. 



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

 Eegion. 



Trans. Geol. Soc. of Penn., vol. i, pp. 335-341, pi. 13, Phila., 1835. 



The contact between the Eocene and "older Pliocene"' (Miocene) is noted as exhibited 

 on the James River near City Point and again at Coggin Point. A species of coral from 

 the Miocene of Virginia is described and figured. 



Observations on the Tertiary Strata of the Atlantic Coast. 



Amer. Jour. Sci., vol. xxviii, pp. 104-111, 280-282, 1835. 



The beds at Yorlitown, on the James River near "Smithfall" (Smithfleld ?) and 

 Suffolli, are referred to the Medial Pliocene, which formation is characterized by the 

 presence of 30 per cent, of living species in the fossil fauna. The beds now referred to 

 the Calvert, Choptank, and St. Mary's formations are termed "Older Pliocene" and are 

 characterized by numerous specimens of Perna maxillata and a few living species. The 

 Miocene is said to be "probably wanting." 



Taylor, Eichard C. Notice of Certain Fossil Acotyledonous Plants 

 in the Secondary strata of - Fredericksburg. 



Trans. Geol. Soc. of Penn., vol. i, pp. 320-325, pi. 19, Phila., 1835. 



Six plants from the Potomac deposits are described and figured in this article. 



1836 



EoGERS, William B. Eeport of the Geological Eeconnaissance of the 

 State of Virginia. 



144 pp., 1 map, Phila., 1836. 



Reprint of Reports on the Geology of the Virginias, pp. 21-122, New York, 1884. 



The geographic distribution, the stratigraphic relations, and lithologic characters, 

 the conditions of deposition, and the economic products of the Miocene and Eocene strata 

 are all discussed. The superficial deposits of sands, gravels, indurated ferruginous 

 sandstones, and ochreous clays are described from the Middle Tertiary (Miocene) district 

 but are not separated from the Miocene strata. 



1837 



Eeport of the Progress of the Geological Survey of the State 



of Virginia for the year 1836. 



22 pp. Richmond, 1837. Another edition, 14 pp. 4°, Richmond, 1837. Reprint 

 of Reports on the Geology of the Virginias, pp. 122-145, New York, 1884. 



