Maryland Geological Survey 57 



Featherstonhaugh, G. W. Eeport of a geological reconnoissance 

 made in 1835, from the seat of goverament, by the way of Green Bay and 

 the Wisconsin Territory, to the Coteau du Prairie, an elevated ridge divid- 

 ing the Missouri from the St. Peter's Piiver. 168 pp. and 4 plates. Wash- 

 ington, 1836. 



1840 



DucATEL, J. T. Annual report of the Geologist of Maryland, 1840. 

 8vo, 47 pp., map and sections. [Annapolis, 1840.] 



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

 Sess., 1840, n. d., Svo, 43 pp., and 3 plates. 



1842 



Conrad, T. A. Observations on the Silurian and Devonian systems of 

 the United States. 



Jour. Acad. Nat. Sci. Phila., vol. viii, 1842, pp. 228-280. 



Eogers, W. B. and H. U. On the Physical Structure of the Appa- 

 lachian Chain as exemplifying the laws which have regulated the eleva- 

 tion of great mountain chains. 



Repts. Amer. Assoc. Geol. and Nat., 1842, pp. 474-531. 



1854 

 Higgins, James. The Fourth Annual Eeport of James Higgins, M. D., 

 State Agricultural Chemist to the House of Delegates of the State of 

 Maryland. Baltimore, 1854, 92 pp. 



1857 



Hall, Jambs. Descriptions of Paleozoic fossils, chiefly from those 

 constituting the third volume of the Palaeontology of New York; with 

 others from the fourth volume, etc. 



lOth Ann. Rept. Regents Univ. of New York on the Condition of the State Cab 

 of Nat. Hist., Albany, 1857, Appendix C, pp. 39-180. 



1858 



Hall, James. Contributions to the Palaeontology of New York ; being 

 some of the results of investigations made during the years 1855, 1856, 

 1857, and 1858. 



12(h Ann. Rept. Regents Univ. of New Y^ork on the Condition of the State 

 Cab. of Nat. Hist., Albany, 1858, pp. 7-62. 



