54 The Lower Cretaceous Deposits of Maryland 



-. The Jurassic formation on the Atlantic coast. 



Am. Journ. Sci., 4th ser., vol. ii, 1896, pp. 433-447. 



Ward, Lester F. Some analogies in the Lower Cretaceous of Europe 

 and America. 



Sixteenth Ann. Rept. U. S. Geol. Surv., pt. 2, 1896, pp. 463-542, pis. xcvii-cvii. 



1897 

 Clark, William Bullock, and Bibbins, Arthur. The stratigraphy 

 of the Potomac group in Maryland. 

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



Ward, Lester ¥. Descriptions of the species of Cycadeoidea or fossil 

 cycadean trunks, thus far discovered in the iron-ore belt, Potomac forma- 

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Proc. Biol. Soc. Wash., vol. xi, 1897, pp. 1-17. 



. Professor Fontaine and Doctor ISTewberryvon the age of the 



Potomac formation. 



Science, N. S., vol. v, 1897, pp. 411-423. 



1898 

 Knowlton, Frank Hall. A Catalogue of the Cretaceous and Ter- 

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U. S. Geological Survey, Bulletin 152, 8°, 247 pp., 1898. 



1900 

 McGee, W J. [The Sixteenth Street Section at Washington, D, C] 

 Science, N. S., vol. xii, 1900, pp. 990-991. 



1902 

 Berry, Edward W. Notes on Sassafras. 

 Bot. Gaz., vol. xxxiv, 1902, pp. 426-450. 



Bonsteel, J. A. Soil Survey of Prince George's county, Md. 

 Field Oper. Bureau Soils, 1901, U. S. Dept. Agri., Third Rept. Bureau Soils, 

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Dorset, C. W., and Bonsteel, J. A. The Soils of Cecil county. 

 Md. Geol. Surv., Cecil County, 1902, pp. 227-248, pis. xx-xxii, with map. 



Clark, W. B., and Bibbins, A. Geology of the Potomac group in the 

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Bull. Geol. Soc. Am., vol. xiii, 1902, pp. 187-214, pis. xxii-xxviii. 



