129 Geological Bibliography of Virginia 73 



Onyx, by G. P. Merrill, pp. 481-486. 



Virginia, see p. 486. 

 Peat, pp. 489-496. 



Virginia, see p. 490. 

 Pyrites, by W. H. Adams, pp. 547-550. 



Virginia, see p. 549. 

 Slate, pp. 580-582. 



Virginia, see pp. 580, 582. 

 Tin, pp. 607-614. 



Virginia, see p. 607. 

 Tripoli and Infusorial Earth, p. 2. 



Virginia, see p. 2. 

 Tungsten, pp. 615-618. 



Virginia, see p. 616. 



Rowan, G. H., Apatite from Amelia County, Virginia. 

 The Virginias, vol. vi. p. 24, 1885. 



Ries, Heinrich, (See under Roth well, R. P.). 

 Ruffin, Bdmund, Description of a Nut Found in Eocene 

 Marl. 



Amer. Jour. Sci., 2d ser., vol. ix, pp. 127-129, 1850. 



Ruffher, W. H., Something about the Minerals of Southwest 

 Virginia. 



The Virginias, vol. i, p. 97, 1880. 



Rogers' Geology of the Virginias. 



The Virginias, vol. vi, pp. 83-84, 1885. 

 Notices in different Journals. 



Report on the Landed Property of the Buena Vista 



Company. 



8°, 104 pp., map. 



{Abst.) Amer. Geol., vol. v, pp. 53-54, 1890. 



Russell, I. C, On the Former Extent of the Triassic For- 

 mation of the Atlantic States. 



Amer. Nat., vol. xiv, pp. 703-712, 1880. 

 Read before the Acad. Sci. N. Y., March 22, 1880. 

 Reference to the Virginia Trias. 



Natural Gas and Coal in Chesterfield County, Virginia. 



Richmond Dispatch, Feb. 20, 1887. 



Subaerial Decay of Rocks and the Origin of the Red 



Color of Certain Formations. 



Bull. U. S. Geol. Surv., No. 52, 65 pp., 5 pis., 1889. 

 {Abst.) Amer. Geol., vol. v, pp. iio-iii, 1890. 



