MARYLAND GEOLOGICAL SURVEY 47 



Smock, J. C. The Useful Minerals of the United States. 

 Mineral resources U. S., 1882, Washington, 1883, pp. 664, 690-693. 

 Notes presence of fossil wood beneath Quaternary gravels in an excavation on 

 Connecticut Avenue, Washington, D. C. 



Uhler, P. E. Geology of the Surface Features of the Baltimore 



Area. 



Johns Hopkins Univ. Cir. No. 21, vol. ii, 1883, pp. 52-53. 



(Abst.) Science, vol. i, 1883, pp. 75-76, 277. 



Mentions presence of certain, probably Pleistocene, gravels. 



1884. 



Chester, Frederick D. The Quaternary Gravels of Northern Dela- 

 ware and Eastern Maryland, with map. 



Amer. Jour. Sci., 3d ser., vol. xxvii, 1884, pp. 189-199. 



Separates Quaternary deposits into " Red gravels " at base and " Philadelphia clay " 

 above. 



Eogers, William Barton. A reprint of Annual Beports and other 

 papers, on the Geology of the Virginias, sm. 8vo. Appleton, 1884. 



Suggests the presence of ancient coast line near the position of " fall line." 



1885. 



Chester, Frederick D. The Gravels of the Southern Delaware 

 Peninsula. 



Amer. Jour. Sci., 3d ser., vol. xxix, 1885, pp. 36-44. 



Post Glacial boulders of Snow Hill, Md., pp. 41-43. This deals especially with the 

 Quaternary and modern deposits, though discussing the surface deposits of the whole 

 area. 



1886. 



McGee, W J Geological Formations underlying Washington and 



Vicinity. 



Rept. Health Officer of the District of Columbia for the year ending June 

 30, 1885, by Dr. S. Townsend, pp. 19-21, 23-35. 



(Abst.) by author in Amer. Jour. Sci., 3d ser., vol. xxxi, 1886, pp. 473-4. 



Describes the composition and distribution of the Columbia and underlying Potomac 

 formations and something of the Crystalline rocks. 



Geography and Topography of the head of Chesapeake Bay. 



(Bead to Amer. Assoc. Adv. Sci. 1886.) 



(Abst.) Amer. Jour. Sci., 3d ser., vol. xxxii, 1886, p. 323. 

 Describes the drainage and topographic features. 



