MARYLAND GEOLOGICAL SURVEY 41 



Maclure, Wm. Observations on the Geology of the United States, 

 explanatory of a Geological Map. (Read Jan. 20, 1809.) 



Trans. Amer. Phil. Soc, o. s. vol. vi, 1809, pp. 411-428. 



Jour, de Phys., lxix, 1809, pp. 204-213. 



All Coastal Plain sediments are classed as " Alluvium." No separate mention is made 

 of the deposits now known as Pleistocene. 



1811. 



Maclure, Wm. Suite des observations sur la geologie des Etats- 



Unis. Journ. de phys., de chim. et d'hist. nat., vol. lxxii. Paris, 1811. 

 With map. pp. 137-105. 



Same as above. 



1817. 



Maclure, Wm. Observations on the Geology of the United States 

 of America, with some remarks on the effect produced on the nature 

 and fertility of soils by the decomposition of the different classes of 

 rocks. With two plates. 12mo. Phila., 1817. 



A classic work giving many references to the limits and character of the geological 

 formations in Maryland. The text and map (120 m. to the inch) represent the Cre- 

 taceous extending southwest to the Susquehanna only. All land to the southeast of 

 " Primitive " is " Alluvium " in Maryland. Pages 105-107 deal especially with Maryland. 



1818. 



Maclure, Wm. Observations on the Geology of the United States 

 of America, with some remarks on the probable effect that may be 

 produced by the decomposition of the different classes of Eocks on 

 the nature and fertility of Soils. Two plates. 



Republished in Trans. Amer. Phil. Soc, vol. i, n. s., 1818, pp. 1-91. 



Leon. Zeit., i, 1826, pp. 124-138. 



Much the same as above. 



Mitciiill, Samuel L. Cuvier's Essay on the Theory of the Earth. 

 To which are now added Observations on the Geology of North Am- 

 erica. 8vo. 431 pp. Plates. New York, 1818. 



The book contains two figures of an elephant's tooth from Maryland. 

 Contains references to Eastern Shore of Maryland. 



1820. 



Hayden, H. H. Geological Essays; or an Inquiry into some of the 

 Geological Phenomena to be found in various parts of America and 

 elsewhere. 8vo. pp. 412. Baltimore, 1820. 



Cites Maryland localities, especially about Baltimore, in support of his theory. 

 Cites the finding of numerous mastodon teeth in Maryland. 



