36 THE CAMBRIAN AND ORDOVICIAN DEPOSITS OF MARYLAND 



Results of a preliminary survey of the state. The area and formations of the 

 state are divided into three divisions corresponding to the present Coastal Plain, Pied- 

 mont Plateau and Appalachian areas. Many local descriptions and references are 

 given with marked tendency towards economic point of view. 



1835 



TAYLOR, RICHARD C. Review of Geological Phenomena and the deduc- 

 tions derivable therefrom in two hundred and fifty miles of sections in 

 parts of Virginia and Maryland. 



Trans. Geol. Soc. Penn., vol. i, 1835, pp. 314-325 (with colored sections). 



The paper describes various sections, one of which extends from Winchester to 

 Harper's Ferry and thence east to within 30 miles of Baltimore. This section is pi. 

 xvii, fig. 1. 



1841 



DUCATEL, J. T. Annual Report of the Geologist of Maryland, 1840. 

 8vo. 46 pp. (Annapolis, 1840.) Map and sections. 



Another edition, 8vo., 59 pp. and 3 plates, also Md. House of Delegates, Dec. 

 Sess., 1840, n. d., 8vo., 43 pp., 3 plates. 



Considers the physical geography and geology of Allegany and Washington counties, 

 with notes on the copper mining about Frederick. 



1853 



MARCOU, JULES. A Geological Map of the United States and the 

 British Provinces of North America, with an explanatory text (etc.). 

 8vo. Boston, 1853. 



Represents no Cretaceous on Western Shore ; most of the Eastern Shore as Alluvium 

 and the rest of the state covered successively by bands of Metamorphlc, New Red, 

 Metamorphic, Silurian and Devonian. No Carboniferous is represented within the 

 limits of the state (?). 



1855 



MARCOU, J. Resume explicatif d'un carte geologique des Etats-Unis 

 et des provinces anglaises de 1'Amerique. 



Bull. Soc. G4ol. Fr., 2 ser., tome xii, 1855, pp. 813-936; colored geological map. 

 Explanation of map itself, so far as related to Maryland, apparently based on 

 Maclure. 



1856 



HITCHCOCK, E. Outline of the Geology of the Globe and of the United 

 States in particular, with geological maps, etc. 8vo. Boston, 1856. 

 (3ded.) 



In discussing the areal distribution of the different formations he frequently men- 

 tions Maryland, giving reasons for location of the lines on his maps. 



