64 THE PHYSICAL FEATUKES OF PRIXCE GEORGE^S COUNTY 



McGee, W J. Geographic Development of the District of 

 Columbia. 



National Geog. Mag., vol. ix, 1898, pp. 317-323. 



The geography and geology of the region about Washington are described 

 and the conditions that prevailed during the formation of the Columbia 

 deposits discussed. 



1899. 



Abbe^ Clevelaxd^ Jr. General Report of the Physiography of 

 Maryland. 



Maryland Weather Service, vol. i, Baltimore, 1899, pp. 41-216, pis. 3-19, 

 figs. 1-20. 



Contains a full description of the physiographic features of the State. 



1900. 



Abbe^ Clevela3s'd^ Jr. The Physiographic Features of Maryland. 

 Bull. Amer. Bus. Geog., vol. i, pp. 151-157, 242-248, 342-355, 2 figs., 1900. 

 A concise statement of the important physical features of each of the three 

 physiographic provinces of the State. 



McGee^ W J. Occurrence of the Pensauken ( ?) Porniatiou. 



Abstract Am. Ass. Adv. Sc. Proc, vol. Ivix, p. 187. 



In a deep cutting on Sixteenth street, Washington, there is an exposure 

 that seems to reveal two unconformable gravel formations overlying the 

 Potomac strata. The lower is provisionally correlated with the Pensauken 

 of New Jersey while the upper is said to be undoubted Earlier Columbia. 



1901. 

 Clark^ W. B. and G. C. Marti>'. The Eocene Deposits of Mary- 

 land. 



Md. Geol. Surv., Eocene, Balto., 1901, pp. 21-92, 14 pis. 



Describes the general stratigraphic relations, distribution, characters, 

 origin of the materials, and the stratigraphic and paleontologic character- 

 istics of the Eocene strata. 



Clark^ W. B. With coHabo ators. Systematic Paleontologv. 



Eocene. 



Md. Geol. Surv., Eocene, Balto., 1901, pp. 95-215, pis. 10-64. 



Contains descru^tions and figures of all Eocene fossils known to occur 

 within the State. 



