84 Bulletin 7 140 



Rockingham county, oil, p. 279. Crane's Nest Coal & Iron Co., 

 Wise, Dickinson, Scott and Russell counties, p. 582. Pocahontas, 

 coal, p. 660. Craig county, manganese, coal, and iron, p. 726. Pat- 

 rick county, silver, and Roanoke county, zinc, p. 752. 

 Ibid., vol. li, 1 89 1. 



Wise county, coal, and Blue Ridge tin mines, pp. 244, 480. Giles 

 county, p. 270. Frederick county, zinc, p. 362. Pocahontas, coal, 

 p. 387. Albemarle, Buckingham, Fluvanna, and Nelson counties, 

 manganese and iron, p. 479. Tazewell county, coal, and Louisa 

 county, pyrites, pp. 639-640. Augusta county mines, p. 704. Dick- 

 inson and Wise counties, coal lands, p. 728. 

 Ibid., vol. lii, 1891. 



Tazewell county, barites, p. 174. Charlotte county, gold, p. 226. 

 Roanoke county, granite and marble, p. 344, zinc, p. 463. Page 

 county, iron, pp. 514, 711. Augusta and Pulaski counties, mines, 

 p. 576. Fluvanna county, iron and slate, p. 600. Augusta, Fairfax, 

 and Richmond counties, p. 650. 

 Ibid., vol. liii, 1892. 



Alleghany county, tin ore, p. 410. Chesterfield, Goochland, Pu- 

 laski, and Roanoke counties, p. 483. 

 Ibid., vol. Ivi, 1893. 



Louisa county, pyrites, p. 354. 

 Ibid., vol. Ivii, 1894. 



Manganese ore in Virginia, p. 602. 



Vodges, Anthony W., Notes on the Distribution of Iron 

 Ores in the United States, Compiled from Various Geo- 

 logical Reports. 



Fort Monroe, Va,, 1886. 24 pp. 

 For Virginia, see pp. 19-24. 



w 



Walcott, C. D., Correlation Papers — Cambrian. 



Bull. U. S. Geol. Surv., No. 81, 1891. v & 447 pp. 

 For Virginia, see especially pp. 133-138, 290-299, 311, 383. 



Notes on the Cambrian Rocks of Virginia and the South- 

 ern Appalachians. 



Amer. Jour. Sci., 3d ser. , vol. xliv, pp. 52-57, 1892. 



Notes on the Cambrian Rocks of Pennsylvania and Mary- 

 land, from the Susquehanna to the Potomac. 



Amer. Jour. Sci., 3d ser., vol. xliv, pp. 469-482, 1892. 



The Natural Bridge of Virginia. 



Nat. Geog. Mag., vol. v, pp. 59-62, plate and figure, 

 1893- 



