68 THE PHYSICAL FEATUKES OF PRINCE GEOKGE^S COUNTY 



Berry^ Edward W. Contributions to the Mesozoic Flora of the 

 Atlantic Coastal Plain — I. 



Bulletin Torrey Bot. Club, vol. xxxiii, pp. 163-182, pi. 7-9. 



Describes Fossil Plants from the Magothy formation of New Jersey, Dela- 

 ware and Maryland including one species from Prince George's county. 



Wieland^ G. R. American Fossil Cycads. 



Carnegie Inst., "Washington, Pub. No. 34, 4 to 296 pp., 138 figs, 50 pis., 1906. 



The cycads found in the Potomac beds of Maryland are mentioned while 

 the structure, growth, and relationships of cycads are discussed in great 

 detail. 



1907. 

 Shattuck^ George Burbank^ Miller, Benjamin LeRoy^ and 

 BiBBiNS, Arthur. Patnxent Folio, Maryland — District of Colum- 

 bia. 



U. S. Geol. Surv., Geol. Atlas of U. S., folio No. 152, Washington, 1907, 4to., 

 12 pp., 3 maps. 



Contains a description of each of the formations outcropping in the area 

 which embraces a large portion of Prince George's county and shows their 

 distribution on the accompanying map. 



1908. 

 Clark^ Wm Bullock. Results of a recent investigation of the 

 coastal plain formations in the area between Massachusetts and 

 IS'oi'th Carolina. 



Bull. Geol. Soc. Amer., vol. xx, 1908, pp. 646-654. 



1910. 

 Berry, Edward W. Contributions to the Mesozoic Flora of the 

 Atlantic coastal plain. — IV. Maryland. 



P.ulletin Torrey Bot. Club, vol. xxxvii, 1910, pp. ]9-2!», pi. viii. 



