62 THE PIIYSICAl. lOiATURES OF PRINCE GEOKGe's COUN'TY 



Ceakk, W. 1j. The Potomac River Section of the ^Middle Atlantic 

 Coast Eocene. 



Amer. Jour. Sc, 4th ser., vol. i, 1896, pp. 365-374. 



Sections along the Potomac River are given and the characteristics of the 

 Maryland and Virginia Eocene deposits described. The writer states that 

 "the Middle Atlantic Slope Eocene represents in a broad way all or the major 

 part of the Lignitic, Buhrstone and Claiborne of Smith . . . and perhaps 

 even more." 



Dartox^ X. H. Artesian Well Prospects in the Atlantic Coastal 

 Plain Region. 



Bull. 138, U. S. G. S., 232 pp., 19 pis. 



Contains a brief description of the Coastal Plain formations of the State 

 with a discussion of their water-bearing powers. Records are given of a 

 150-foot well at Agricultural College, of a 384-foot well at Bowie, and a 1481/4- 

 foot well near Laurel, and a 222-foot well at Marlboro. 



FoxTATXE, W. M. Potomac Formation in Virginia. 



Bull. U. S. G. S., 145, 149 pp., 2 pis. 



Brief descriptions of the Potomac deposits of Maryland given. Two series 

 of strata are said to occur in Maryland. From a study of the flora the 

 Potomac is said to be of Middle or Lower Neocomian age. 



Marcou, Jules. The Jnra in the United States. 

 Science, n. s., vol. iv, 1896, pp. 945-947. 

 Agrees with Marsh that the Potomac deposits belong to the Upper Jurassic. 



Marsh, O. C. The Jnrassic Formation on the Atlantic Coast. 

 Science, n. s., vol. iv, pp. 805-816. 

 The author maintains the Jurassic age of the Potomac deposits. 



Marsh, O. C. The Dinosans of North America. 

 16th An. Rep. U. S. G. S., part i, pp. 195-413, 84 pis., 66 figs. 

 Dinosaurian remains from the Potomac deposits of Prince George's county 

 are described and figured. 



Ward^ Lester F. Some Analogies in the Lower Cretaceons of 

 Europe and America. 



16th An. Rep. U. S. G. S., part i, pp. 463-542, pis. 97-107. 



From a comparison of the floras the writer correlates the Potomac strata 

 with the Wealden of England. 



