48 The Lower Cretaceous Deposits op Maryland 



1833 

 Hitchcock, Edward. Eeport on the Geology, Mineralogy, Botany, 

 and Zoology of Massachusetts. 

 Amherst, 1833, pp. 201-202, 



1835 



Clemson", Thomas G-. l^otice of a geological examination of the 

 country between Fredericksburg and Winchester, in Virginia, including 

 the gold region. 



Trans. Geol. Soc. Pa., vol. i, pt. 2, Phila., 1835, pp. 298-313, pi, xvii. 



Taylor, Eichard C. Eeview of geological phenomena, and the de- 

 ductions derivable therefrom, in two hundred and fifty miles of sections 

 in parts of Virginia and Maryland ; also notice of certain fossil acotyledo- 

 nous plants in the Secondary strata of Fredericksburg. 



Trans. Geol. Soc. Pa., vol. i, pt. 2, Phila., 1835, pp. 314-325, pis. xviii-xix. 



1836 



Eogers, William B. Eeport of the Geological Eeconnaissance of the 

 State of Virginia, made under the appointment of the board of public 

 works. 



Phila., 1836, p. 61. 



1840 

 Eogers, William B. Eeport of the Progress of the Geological Survey 

 of the State of Virginia for the year 1839. 

 Richmond, 1840. 



1841 

 Eogers, William B. Eeport of the Progress of the Geological Survey 

 of the State of Virginia for the year 1840. 

 Richmond, 1841. 



1844 

 Eogers, H. D. Address delivered at the Meeting of the Association 

 of American Geologists and Naturalists, 



Amer. Jour. Sci., vol. xlvii, 1844, pp. 137-160, 247-278. 



1855 

 Taylor, Eichard C. Statistics of Coal, 2d Ed. 

 Phila., 1855, p. 299. 



