42 THE PLIOCENE AND PLEISTOCENE DEPOSITS OF MARYLAND 



1822. 



Cleaveland, Parker. An elementary treatise on Mineralogy and 

 Geology. 6 plates. 2d edition in 2 vols. Boston. 1822. 



The outline of the " Alluvial Deposits " of Maclure is reproduced, together with his 

 map. He refers briefly to the character of the material. The Pleistocene materials 

 seem to have attracted his attention mere than most of the other Coastal Plain forma- 

 tions. 



1824. 



Finch, John. Geological Essay on the Tertiary Formations in Am- 

 erica. (Eead Acad. Nat. Sci. Phila., July 15, 1823.) 



Amer. Jour. Sci., vol. vii, 1824, pp. 31-43. 



Objects to Maclure's use of Alluvium and shows that the formations so called are 

 mostly Tertiary. 



States that " diluvial " deposits cover the region. Tim " diluvial " is in part at 

 least what is to-day known as Columbia. 



1828. 



Tanuxem, L., and Morton, S. G. Geological Observations on Sec- 

 ondary, Tertiary, and Alluvial formations of the Atlantic coast of the 

 United States arranged from the notes of Lardner Vannxem. (Eead 

 Jan. 1828.) 



Jour. Acad. Nat. Sci., Phila., vol. vi, 1829, pp. 59-71. 



The Coastal Plain deposits are divided into Secondary, Tertiary, Ancient Alluvial 

 and Modern Alluvial. The last two are apparently included in what is regarded to-day 

 as Lafayette, Pleistocene, and Recent. 



1830. 



Conrad, T. A. On the Geology and Organic Eemains of a part of 



the Peninsula of Maryland. 



Jour. Acad. Nat. Sci!, Phila., vol. vi, pt. 2, 1830, pp. 205-230, with two plates. 



Calls attention to the " diluvial " deposit of sand and gravel which covers the 

 surface of southern Maryland. Describes the Cornfield Harbor fossil locality (Wailes 

 bluff I and gives list of fossils found there. 



1832. 



Conrad, T. A. Fossil Shells of the Tertiary Formations of North 

 America illustrated by figures drawn on Stone from Nature. Phila. 

 46 pp. [vol. i, pt. 1-2 (1832), 3-4 (1833)]. 



(Repub.) by G. D. Harris, Washington, 1893. 



(Part 3 was republished with plates, March 1, 1S35.) 



Kcfers to the Pleistocene deposits as "diluvial" deposits and describes them. 



