50 The Upper Cretaceous Deposits of Maryland 



Miller, B. L., and others. The Physical Features of Prince George's 

 County. 



Md. Geol. Survey, Rept. on Prince George's Co., 1911, 251 pp., 13 pis., 3 figs. 



1912 



Perry, Edward W. Notes on the genus Widdringtonites. 

 Torrey Bot. Club Bull., vol. xxxix, 1912, pp. 341-348. 



Clark, Wm. Bullock. Atlantic Coastal Plain, Massachusetts to North 

 Carolina, inclusive. 



In U. S. Geol. Survey Prof. Paper No. 71, 1912, pp. 608-614. 



- and Miller, B. L., and others. Physiography and Geology of 

 the Coastal Plain Province of Virginia. 

 Va. Geol. Survey, Bull. No. 4, 1912, 272 pp. 



— and Stephenson, L. W., Miller, B. L.. and others. The 

 Coastal Plain of North Carolina. 



N. C. Geol. Survey, vol. iii, 1912, 552 pp., 42 pis. 



1914 

 Berry, Edward W. Contributions to the Mesozoic flora of the Atlantic 

 Coastal Plain. X. 



Bull. Torrey Bot. Club, vol. xli, 1914, pp. 295-300. 



Stephenson, L. W. The Cretaceous deposits of the Eastern Gulf 

 Region and species of Exogyra from the Eastern Gulf Region and the 

 Carolinas. 



Prof. Paper, U. S. Geol. Survey, No. 81, 1914, 77 pp., 21 pis. 



STRATIGRAPHTC AND PALEONTOLOG1C CHARACTERISTICS 



The Upper Cretaceous deposits of Maryland extend from the Delaware 

 border with gradually decreasing thicknesses to the valley of the Potomac 

 River, where they finally disappear in surface outcrop by the trans- 

 gression of the Tertiary deposits, which in Virginia rest directly on 

 Lower Cretaceous strata. 



The Upper Cretaceous deposits of Maryland are much less extensively 

 developed than to the northward in New Jersey, where they attain their 



