42 THE PHYSICAL FEATURES OF ST. MARY's COUNTY 



1837. 



DucATEL, J. T. Outline of the Physical Geography of iVIaryland, 

 embracing its prominent Geological Features. 



Trans. Md. Acad. Scl. and Lit., vol. i, 1837, pp. 24-54, with map. 



DucATEL, J. T., and Alexander, J. H. Eeport on the New Map 

 of Maryland, 1836. 8vo, 104 pp. and 5 maps. [Annapolis, 1837.] 

 Md. House of Delegates, Dec. Sess., 1836. 

 Another edition, 117 pp. 



1838. 



Conrad, T. A. Fossils of the Medial Tertiary of the United States. 

 No. 1, 1838. [Description on cover 1839 & '40.] 33 pp. Plates 

 I-XVII. 



(Repub.) by Wm. H. Dall, Wasl^ington, 1893. 



Wagner, William. Description of five new Fossils, of the older 

 Pliocene formation of Maryland and North America. (Eead Jan. 1838.) 

 Jour. Acad. Nat. Sci., Phila., vol. viil, 1838, pp. 51-53, with one plate. 



1840. 



Conrad, T. A. Fossils of the Medial Tertiary of the United States. 

 No. 2. 1840. [Description on cover 1840-1842.] pp. 33-56. Plates 

 XVIII-XXIX. 



(Repub.) by W. H. Dall, Washington, 1893. 



1841. 

 Conrad, T. A. Description of Twenty-six new Species of Fossil 

 Shells discovered in the Medial Tertiary Deposits of Calvert Cliff.?, Md. 

 Proc. Acad. Nat. Sci., Phila., vol. i, 1841, pp. 2S-33. 



1842. 

 Conrad, T. A. Observations on a portion of the Atlantic Tertiary 

 Eegion, with a description of new species of organic remains. 

 2d Bull. Proc. Nat. Inst. Prom. Scl., 1842; plates, pp. 171-192. 



Description of twenty-four new species of Fossil Shells chiefly 



from the Tertiary Deposits of Calvert Cliffs, Md. (Eead June 1, 1841.) 



Jour. Acad. Nat. Sci., Phila., vol. viii, 1842, pp. 183-190. 



Descriptions of new Tertiary Fossils. 



2d Bull. Proc. Nat. Inst. Prom. Sci., 1842, pp. 192-194, two plates. 



