56 THE PLIOCENE AND PLEISTOCENE DEPOSITS OE MARYLAND 



Eies, H. Eeport on the Clays of Maryland. 

 Md. Geol. Surv. for 1902, pp. 205-505, plates xix-lxix. 

 Discusses Lafayette and Columbia clays, gives tests and suggests uses. 



Shattcck, G. B. Development of Knowledge concerning the Physical 

 Features of Cecil county, with Bibliography. 



Md. Geol. Surv. Cecil County, 1902, pp. 31-62, plates ii-iii. 

 Gives short history and bibliography. 



The Geology of the Coastal Plain Formations. 



Md. Geol. Surv. Cecil County, 1902, with geological map, pp. 149-194, figs. 

 8-11, plates xii-xvi. 



Geology is discussed at some length and the distribution of formations shown on 

 geological map. 



■ — — The Physiography of Cecil county. 



Md. Geol. Surv. Cecil County, 1902, pp. 63-82, figs. 1-4, plates ii-iii. 

 Discusses physiographic conditions. 



The Pleistocene Problem in Maryland. 



(Abst.) Science, vol. xv, No. 388, 1902, pp. 906-907. 

 A summary of the Pleistocene geology of Maryland. 



Smith, W. G., and Martin, J. O. Soil Survey of Harford county, 



Md. 



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

 Soils, 1902, pp. 211-237, with map. 



Discusses Pleistocene soils within the county and shows their distribution on a map. 



1903. 



Maryland Geological Survey in co-operation with U. S. Bureau of 

 Soils. Map of St. Mary's county showing the agricultural soils. Pub- 

 lished on topographic base, prepared for Md. Geol. Surv. by IT. S. Geol. 

 Surv. 



33f x 38^, contour 20 feet, 8 colors and patterns, scale 1/62,500. 



■ ■ in co-operation with IT. S. Geological Survey. Map of St. 



Mary's county showing the geological formations. Published on topo- 

 graphic base, prepared for Md. Geol. Surv. by IT. S. Geol. Surv. 



33f x 38^, contour 20 feet, 7 colors and patterns, scale 1/62,500. 



in co-operation with IT. S. Geological Survey. Map of Calv- 



ert county showing the geological formations. [Eevised edition.] Pub- 

 lished on topographic base, prepared for Md. Geol. Surv. by IT. S. Geol. 

 Surv. 



25£ x 38^-, contour 20 feet, 7 colors and patterns, scale 1/62,500. 

 • Earlier edition appeared in 1902. 



