GEOLOGICAL LITERATURE OF THE VIRGINIA COASTAL PLAIN. 33 



The geographic distribution and lithologic characters of the Eocene and Miocene 

 deposits occurring on the peninsula lying between the Potomac and Rappahannock rivers 

 are described and the economic value of the greensand and shell marl deposits discussed. 



EoGERS^ W. B, AND H. D. Contributions to the Geology of the Tertiary 

 Formations of Virginia. Eead May 5, 1835. 



Trans. Amer. Phil. Soc, vol. v (n. s.), 1837, pp. 319-341. 



Reprinted in part in Geologj- of the Virginias, pp. 661-668, New York, 1884. 



The character of the country and the geology of Elizabeth City, Warwick, York, and 

 James City counties with parts of New Kent and Charles City counties are discussed 

 at considerable length. The sections at Kings Mill and Yorktown are described in par- 

 ticular. The Miocene age is determined by the presence of only 19 per cent, of recent 

 species found in the deposit at Kings Mill, where 74 species have been described. New 

 species of Miocene fossils from Williamsburg and Prince George County are described. 



The Eocene deposits on the James River together with some new species of Eocene 

 fossils are briefly described. 



The superficial deposits resting unconformably upon the Miocene are mentioned, but 

 in the absence of fossils no conclusion is reached regarding their age. 



1838 



Conrad, T. A. Fossils of the Medial Tertiary of the United States. 

 No. 1, 32 pp., 17 pis., Phila., 1838. Republished with an introduction by W. H. 

 Dall, Phila., 1893. 



The geograpliic.ll limits of the formation, the lithologic cliaracters of the strata, and 

 the conditions of deposition are all described. The deposits are correlated with the Crag 

 of England. Fossils from Yorktown, Smithfleld, Suffolk, City Point, and Williamsburg 

 are described and figured. 



EoGERs, Wm, B. Eeport of the Progress of the Geological Survey of the 

 State of Virginia for the year 1837. 



24 pp., 4°, Richmond, 1838. Reprint of Reports on Geology of the Virginias, 

 pp. 145-188, New York, 1884. 



The report contains partial analyses, giving the carbonate of lime content only, of 

 over 1.50 specimens of :Miocene and Eocene marls from the C^oastal Plain counties. The non- 

 occurrence in Virginia of "secondary greensand (Cretaceous) beds, similar to those of 

 New Jersey" between the Eocene and the "coarse conglomerates, sandstones, and clays 

 which overlie the primary rocks" is expressly stated. 



1839 



Conrad, T. A. New Species of Fossil Shells. 



1 p., Phila., 1839. Republished by W. H. Dall, Phila., 1893. 



New fossils from Urbanna, Yorktown and Smithfield are described. 



EoGERS, W. B. AND H. D. Contributions to the Geology of the Tertiary 

 Formations of Virginia. Second series. (Eead March 1, 1839.) 



Trans. Amer. Phil. Soc, vol. vi (n. s.), pp. 347-377, pis. 25-30, 1839. Reprinted 

 in part in Geology of the Virginias, pp. 669-673, New York, 1884. 



