141 Geological Bibliography of Virginia 85 



The Fauna of the Lower Cambrian or Olenellus Zone. 



loth Ann'l Rep't U. S. Geol. Surv., pp. 509-763, pls. 

 49-97, figs. 44-69, 1888-89. 

 For Virginia, see pp. 536-537- 



Notes on the Cambrian Rocks of Pennsylvania from the 



Susquehanna to the Delaware. 



Amer. Jour. Sci., 3d ser., vol. xlvii, pp. 37-41, 1894. 



Paleozoic Intraformational Conglomerates. 



Bull. Geol. Soc. Amer., vol. v, pp. 191-198, pis. 5-7, 



1893-94. 



For Virginia, see p. 195. 



{Abst.) Amer. Nat., vol. xxviii, p. 1023, 1896. 



Wallace, Chas. M., On Flint Implements from the Strati- 

 fied Drift of the Vicinity of Richmond, Virginia. 

 Amer. Jour. Sci., 3d ser., vol. xi, pp. 1 95-1 99, 1876- 

 Geol. Record, 1876, London, 1878, p. 143. 



Ward, I/CSter F., The Geographical Distribution of Fossil 

 Plants. 



8th Ann'l Rep't U. S. Geol. Surv., pt. ii, pp. 663-960, 

 map, 1886-87. 



For Virginia, see pp. 667, 734-735, 873-876. 



Evidence of the Fossil Plants as to the Age of the Po- 

 tomac Formation. 



Amer. Jour. Sci., 3d ser., vol. xxxvi, pp. 119- 131, 1888. 

 {Abst.) Nature, vol. xxxviii, p. 462, 1888. 

 Read before the National Academy of Sciences, Washington, 

 April 20, 1888. 



The Potomac Formation. 



15th Ann'l Rep't U. S. Geol. Surv., pp. 307-397, pls. 

 2-4, figs. 1-5, 1893-94. 



Warner, Chas. D., The Natural Bridge of Virginia. 

 The Virginias, vol. v, pp. 84-85, 1884. 



Webster, Prof. N. B., On the Physical and Geological 

 Charadteristics of the Great Dismal Swamp, and the 

 Eastern Counties of Virginia. 



Amer. Nat., vol. ix, pp. 260-262, 1875. 



Geol. Record, 1875, lyondon, 1877, p. 132. 



Weeks, Jos. D , The Manufacfture of Coke. 

 Min. Res. U. S., 1883-84, pp. 144-213. 

 For Virginia, see pp. 204-205. 



