b2 PHYSIOGRAPHY AXD GEOLOGY" OF THE COASTAL PLAIN PROVINCE. 



HoTCHKiss, Jed. Virginia: A geological and political summary, em- 

 bracing a description of the State, its geology, soils, minerals, climate, etc., 

 319 pp., 4 maps. 



Richmond, 1876. Not seen. 



1877 



Eogers, Wm. B. On the Gravel and Cobble-Stone Deposits of Virginia 

 and the Middle States. 



Proc. Boston Soc. Nat. Hist., vol. xviii, pp. 101-106, 1877. 



Reprint of Reports on the Geology of the Virginias, pp. 700-713, New York, 

 1884. Abstr. Amer. Jour. Sci., 3d ser., vol. ii, pp. 60-61, 1876. 



The lithologlcal characteristics of the superficial deposits (Pleistocene) are described, 

 and also their stratigraphlc relation to the underlying strata. The author supposes that 

 there is some close connection between the gravels and the glacial drifts of the northern 

 states ; either the materials represent transported and water-deposited glacial drift or 

 merely the coarse river sediments brought down by tlie flooded rivers during the glacial 

 period. The resemblance of the superficial deposits and those beds referred to the Upper 

 Secondary (Potomac) is noted. The latter are considered to be Jurassic in age. 



Stodder, Charles. A Contribution to ]Microgeology. Read Dec. 8, 

 1875. 



Proc. Boston Soc. Nat. Hist., vol. xviii, pp. 206-209, 1877. 



Abstr. Amer. Jour. Sci., 3d ser., vol. ii, pp. 493, 494, 1876. 



The writer gives a list of 50 species of diatoms and 6 species of rhizopods found in 

 the diatomaceous earth at Richmond. He reports that the upper strata lack many forms 

 found in the lower layers. 



1879 



Fontaine, William M. Notes on the ]\l6sozoic Strata of Virginia. 



Amer. Jour. Sci., 3d ser., vol. xvii, pp. 25-39, 151-157, 229-239, 1879. Abstr. 

 Neues Jahrbuch. pp. 137-138. 1881. 



The Potomac deposits and their fossils are described briefly and the suggestion is 

 made that perhaps the deposits were found during a Mesozolc ice age. The author quotes 

 Lyell as noting the resemblance between these deposits and the northern Glacial Drift. 



Heinrich, Oswald J. The Mesozoic Formation in ^'irginia. 

 Trans. Amer. Inst. Min. Eng., vol. vi, pp. 227-274, pi. 1879. 

 The Virginias, vol. i, pp. 120-126, 142-145, 155, 176-177, 190-192, pi. 

 The limits of the Mesozoic formations including the Potomac deposits are given and 

 their characteristics discussed briefly. 



Macfarlane, James. An American Geological Eailway Guide. 

 219 pp.. New York, 1879; 2d edit., revised and enlarged, 426 pp. Mew 

 York, 1890. 



Contains many brief statements concerning the Coastal Plain region of Virginia. 



