MARYLAND GEOLOGICAL SURVEY 51 



1892. 



Darton, 1ST. H. On Fossils in the Lafayette Formation in Virginia. 

 Am. Geol., vol. xii, 1892, pp. 181-183. 



Continues Lafayette formation along divides to Chesapeake Bay where It terminates 

 at an elevation of GO to SO feet. Columbia formation develops below this in a terrace. 



Uhler, P. E. Albirupean Studies. 



Trans. Md. Acad. Sci., vol. i, 1890-92, pp. 185-202. 



Brief mention of Pleistocene deposits. 



Whitney, Milton. Eeport of the Physicist. Soil Investigations. 

 4th Ann. Rept. Md. Agri. Exp. Sta., 1891. Annapolis, 1892, pp. 249-296. 

 Many soils described and relations to Lafayette and Columbia deposits indicated. 



Wiliams, Geo. H. (Editor.) Geological Map of Baltimore and Vi- 

 cinity. Published by the Johns Hopkins University on the topographic 

 base of the U. S. Geological Survey. 23^ x 24, contour 20 feet, 18 

 colors. Scale 1/62,500. (J. H. IT.) 



The distribution of the Lafayette gravels and the deposits of the Columbia forma- 

 tions are indicated in the vicinity of Baltimore. 



, and Clark, Wm. B. Eeport on short excursions made by 



the Geological Department of the University during the autumn of 1891. 



Johns Hopkins Univ. Cir. No. 95, vol. xi, 1892, pp. 37-39. 



Describes various areas about Baltimore and Washington. Brief mention of Co- 

 lumbia deposits. 



1893. 



Darton, N. H. Cenozoic History of Eastern Virginia and Maryland. 

 Bull. Geol. Soc. Amer., vol. v, 1893, p. 24. 

 (Abst.) Amer. Jour. Sci., 3d ser., vol. xlvi, 1893, p. 305. 



Remarks by McGee and Salisbury indicate that Darton suggested the division of the 

 Columbia into an upper and lower member. Darton's paper itself is not published. 



Harris, G. D. Eepublication of Conrad's Fossil Shells of the Ter- 

 tiary Formations of North America. 8vo. 121 pp. 20 plates. Wash- 

 ington, D. C, 1893. 



Contains an historical introduction by Harris, giving the dates of publication of the 

 various numbers of Conrad's papers. See Conrad, 1S32-1835. 



Hill, E. T. Clay Materials of the United States. 

 Mineral Resources U. S., 1891, Washington, 1893. 

 Mentions Columbia deposits as furnishing fine brick clays. 



Whitney, Milton. The Soils of Maryland. 



Md. Agri. Exper. Sta., Bull. No. 21, College Bark, 1893, 58 pp., map. 



General discussion of Maryland soil, its types, texture, and absorption properties. 



