MARYLAND GEOLOGICAL SURVEY 43 



1834. 



Ducatel, J. T., and Alexander, J. H. Report on the Projected 

 Survey. of the State of Maryland, pursuant to a resolution of the Gen- 

 eral Assembly. Svo. 39 pp. Annapolis, 1834. Map. 



Md. House of Delegates, Dec. Sess., 1833, 8vo, 39 pp. 



Another edition, Annapolis, 1834, Svo, 58 pp., and map. 



Another edition, Annapolis, 1834, Svo, 43 pp., and folded table. 



Amer. Jour. Sci., vol. xxvii, 1835, pp. 1-38. 



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, Piedmont 

 Plateau, and Appalachian areas. Bog iron ore is reported from Caroline, Dorchester, 

 Somerset, and Worcester counties. Mentions gravel and sand overlying the marls in 

 southern Maryland. 



Harlan, E. Critical Notices of Various organic remains hitherto 

 discovered in North America. (Read May 21, 1834.) 



Trans. Geol. Soc, Pa., vol. i, part 1, 1834, pp. 46-112. 



Med. Phy. Researches, 1835 [with a few additions]. 



The author mentions specimens of Equus cahallus " found in excavating for the 

 Chesapeake and Ohio Canal near Georgetown, D. C, not far from the Potomac River." 



1835. 

 Ducatel, J. T. Geologist's report 1834. pp. 84. 



[Another edition.] Report of the Geologist to the Legisla- 

 ture of Maryland, 1834. n. d. Svo, 50 pp. 2 maps and folded tables. 



Mentions the occurrence of sand, gravel, and clay overlying older deposits. 



, and Alexander, J. H. Report on the New Map of Mary- 

 land, 1834, [Annapolis] n. d. 8vo, 59, i, pp. Two maps and one folded 

 table. 



Md. House of Delegates, Dec. Sess., 1834. 



Mentions " diluvial " deposits of gravel, sand, and clay in Prince George's and Charles 

 counties. 



1836. 



Ducatel, J. T. Report of the Geologist, n. d. 8vo, pp. 35-84. 

 Plate. 



Separate publication (see Ducatel and Alexander.) 



, and Alexander, J. H. Report on the New Map of Mary- 

 land, 1835. Svo, 84, 1 pp. [Annapolis, 1836.] 

 Md. Pub. Doc, Dec. Sess., 1835. 

 Another edition, 96, 1 pp. and maps and plate. 

 Engineer's Report, pp. 1-34. 



