40 THE PLIOCENE AND PLEISTOCENE DEPOSITS OF MARYLAND 



As a result of this work, soil maps with accompanying descriptive text 

 have been issued for Cecil, Calvert, Kent, Prince George's, and St. Mary's 

 counties. As these publications are accessible, they will not be discussed 

 further in this place. Mathews, in 1902, described at some length the 

 mineral resources of Cecil county where he took into consideration the 

 value of certain gravels found among the surficial deposits, and Eies in 

 the same year published analyses of certain of the Columbia clays. One 

 of the most important contributions on the economic geology of the 

 Lafayette and Columbia deposits is that made by Clark and Johnson who, 

 in 1899, published a report on the highways of Maryland in which was 

 shown the value of the surficial deposits in the construction of roads. 

 A large number of maps were published, showing the distribution of this 

 road material. 



BIBLIOGRAPHY. 



Containing references to the Geology and Economic Resources of the 

 Pliocene and Pleistocene deposits of Maryland. 



1624. 



Smith, John. A Generall Historie of Virginia, New England, and 

 the Summer Isles, etc. London, 1624. (Several editions.) 



(Repub.) The True Travels, Adventures, and Observations of Captaine 

 John Smith in Europe, Asia, Afrika, and America, etc. Richmond, 1819, 2 

 vols. — from London edition of 1629. 



Pinkerton's Voyages and Travels, vol. 13, 4to, London, 1812, pp. 1-253 — 

 from London edition of 1624. 



Eng. Scholars Library No. 16. (For bibliography of Smith's works and 

 their re-publication, see pp. cxxx-cxxxii.) 



This work contains many interesting notes on the physiography of Chesapeake Bay 

 and its tributaries, and briefly describes the clays and gravels along their shores. 



1809. 



Godon, Silvain. Observations to serve for the Mineralogical Map of 



the State of Maryland. (Eead Nov. 6, 1809.) 



Trans. Amer. Phil. Soc, o. s. vol. vi, 1809, pp. 319-323. 



Observations on the area about Washington and Baltimore. 



All the Coastal Plain sediments are described briefly as " Alluvium Soil." His descrip- 

 tion has to do principally with the deposits now known as Potomac. 



