Maryland Geological Survey 49 



1859 



Johnston, Christopher. 



Am. Journ. Dental Science, N. S., vol. ix, Phila., 1859, p. 341 



1860 



Tyson, P. T. First Eeport of Philip T. Tyson, State Agricultural 

 chemist, to the House of Delegates of Maryland, Jan., 1860. 8vo. 145 

 pp. Annapolis, 1860. Maps. 



Md. Sen. Doc. [E]. Md. House Doc. [C]. 



1865 

 Leidy, Joseph. 



Smith. Cont. to Knowledge, No. 192, vol. xiv, article vi, 1865, p. 102, pi. 

 xiii, figs. 20-23; pi. xx, fig. 10. 



1868 

 Cope, E. D. On the discovery of the fresh-water origin of certain 

 deposits of sand and clay in west New Jersey. 



Proc. Acad. Nat. Sci., Phila., vol. xx, 1868, pp. 157-158. 



Maury, M. P. Physical survey of Virginia. 

 Richmond, i, 1868, 8°, 90 pp.; ii, 1878, 8°, 142 pp. 



1875 

 EoGERS, W. B. On the Gravel and Cobblestone Deposits of Virginia 

 and the Middle States. 



Proc. Boston Soc. Nat. Hist., vol. xviii, 1875, pp. 101-106. 



1876 



HoTCHKiss, Jed. Virginia: a geographical and political summary, 

 embracing a description of the State, its geology, soils, minerals, climate, 

 etc. 



Richmond, 1876, 8vo, pp. iv, 319, and 4 maps. 



1878 

 Heinrich, 0. J. The Mesozoic formation in Virginia. 

 Trans. Am. Inst Min. Engs., vol. vi, 1878, pp. 227-274. 



1879 

 Fontaine, Wm. M. Notes on the Mesozoic of Virginia. 

 Am. Journ. Sci., 3d. ser., vol. xvii, 1879, pp. 25-39, 151-157, 229-239. 



