60 THE PHYSICAL FEATURES OF CECIL COUNTY 



1895. 



Clark, Wm. B. Cretaceous Deposits of the Northern Half of the 

 Atlantic Coastal Plain. 



Bull. Geol. Soc. Amer., vol. vi, 1895, pp. 479-482. 



Keyes, C. E. Acidic Eruptives of Northeastern Maryland. 

 Amer. Geol., vol. xv, 1895, pp. 39-46. 



Koberts, D. E. Note on the Cretaceous Eormations of the Eastern 

 Shore of Maryland. 



Johns Hopkins Univ. Cir. No. 121, vol. xv, 1895, p. 16. 



Ward, Lester F. The Potomac Eormation. 



15th Ann. Eept. U. S. Geol. Surv., 1893-94, Washington, 1895, pp. 307-397, 

 plates. 



1896. 



Darton, N. H. Artesian Well Prospects in the Atlantic Coastal 

 Plain Eegion. 



Bull. U. S. Geol. Surv. No. 138, 1896, 228 pp., 19 plates. 



House Misc. Doc., 54th Cong., 2nd sess., vol. xxxv, No. 28. 



Knowltojst, F. H. American Amber-producing Tree. 

 Science, n. s., vol. iii, 1896, pp. 582-584. 



1897. 

 Bauer, L. A. First Eeport upon the Magnetic Work in Maryland, 

 including the History and Objects of Magnetic Surveys. 

 Md. Geol. Surv., vol. i, 1897, pp. 403-529, plates xiv-xvii. 



Clark, Wm. Bullock. Historical sketch, embracing an Account of 

 the Progress of Investigation concerning the Physical Features and 

 Natural Eesources of Maryland. 



Md. Geol. Surv., vol. i, 1897, pp. 48-138, plates ii-v. 



Outline of Present Knowledge of the Physical Features of 



Maryland. 



Ibid., vol. i, 1897, pp. 139-228, plates vi-xiii. 



, with the collaboration of E. M. Bagg and George B. Shat- 



tuck. Upper Cretaceous Formations of New Jersey, Delaware, and 

 Maryland. 



Bull. Geol. Soc. Amer., vol. viii, 1897, pp. 315-358, plates xl-1. 



and Arthur Bibbins. The Stratigraphy of the Potomac 



Group in Maryland. 



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



