MARYLAND GEOLOGICAL SURVEY 63 



Ward. L. F. Age of the Island Series. 

 Science, n. s., vol. iv, pp. 757-760. 



The author brings forward additional evidence to prove that the Potomac 

 deposits belong to the Lower Cretaceous. 



1897. 

 Clark^ W. B. Outline of the Present Knowledge of the Physical 

 Features of Maryland, Embracing an Account of the Physiography, 

 Geology, and Mineral Resources. 



Md. Geol. Survey, vol. i, 1897, pp. 141-228, pis. 6-13. 



Contains a description of all the geologic formations of the State recognized 

 at that time. 



Clark, W. B., with P. M. Bagg^ and G,' B. Shattuck. Upper 

 Cretaceous Formations of N"ew Jersey, Delaware and Maryland. 



Bull. Geol. Soc. of America, vol. viii, 1897, pp. 315-358, pis. 40-50. 



Contains a full description of each of the Marine Cretaceous formations of 

 the Northern Atlantic Coastal Plain. 



Clark^ W. B., and Bibbixs, Arthur. The Stratigraphy of the 

 Potomac Group in Maryland. 



Jour. Geol., vol. v, 1897, pp. 479-506. 



Contains a general description of the Potomac deposits of the State which 

 are divided for the first time into four formations, viz: Patuxent, Arundel, 

 Patapsco and Raritan. 



1898. 



Bagg, p. M., Jr. The Tertiary and Pleistocene Foraminifera of 

 the Middle Atlantic Slope. 



Amer. Pal. Bull., vol. ii. No. 10, Ithaca, 1898, 54 pp., 3 pis. 



The following forms are described from the Eocene deposits at Upper 

 Marlboro: Textiilaria sagittula, Nodosaria consobrina var. emaciata and 

 Nodosaria communis and Taginulma legumen from Sunnyside. 



Bagg^ Purus Mather. The Occurrence of Cretaceous Fossils in 

 the Eocene of Maryland. 



Amer. Geol., vol. 22, 1898, pp. 370-375. 



Specimens of Terebratula Ixarlain "were found in the Eocene marl of Prince 

 George's county in a bank by the roadside on western branch of the Patuxent 

 River about three miles west of Leeland. . . . The greensand at this cut- 

 ting in the road is very fossiliferous and carries the common lower Eocene 

 fauna, Ostrea compressirostra say, Cucullaea giganter Conrad, Cytherea orata 

 Rogers, and several others." 



