91 Geological Bibliography of Virginia 35 



Proc. Acad. Nat. Sci. Phila., vol. xxxiv, pp. 150-186, 

 1882. 



Contributions to the Tertiary Geology and Paleontology 



of the United States. 



Acad. Nat. Sci. Phila., 1884, 117 pp., map. 

 For Virginia, see pp. 14-17, 41-68, 



The Tertiary Geology of the Eastern and Southern 



United States. 



Jour. Acad. Nat. Sci. Phila., 2d ser. , vol. ix, pp. 115- 

 154, 1884-95. 



For Virginia, see especially pp. 128-131. 



Heinrich, O. J., The Midlothian Colliery, Virginia. 



Trans. Amer. Inst. Min. Engrs. , vol. i, pp. 346-359, 

 1871-73. 



Geol. Record, 1874, London, 1875, p. 118. 



Discussion by Messrs. Rockwell, Howe, Firmstone and President. 



The Midlothian Colliery, Virginia. A Supplementary 



Paper. 



Trans. Amer. Inst. Min. Engrs., vol. i, pp. 360-364, 

 pi. 5, figures, 1871-73. 



The Midlothian, Virginia, Colliery in 1876. 



Trans. Amer. Inst. Min. Engrs., vol. iv, pp. 308-316, 

 1875-76. 



An Account of an Explosion of Fire-Damp at the Mid- 

 lothian Colliery, Chesterfield County, Virginia. 



Trans. Amer. Inst. Min. Engrs., vol. v, pp. 148- 161, 

 1876-77, 



— The Mesozoic Formation in Virginia. 



Trans. Amer. Inst. Min. Engrs., vol. vi, pp. 227-274, 

 map and plate (sedlion), 1878, 



{Abst.) Geol. Record, 1879, London, 1887, p. 141. 



The Virginias, vol. i, pp. 120-126, map and secftions, 

 142-145, 155, 176-177. 190-192. 



Map of the Eastern Part of the State of Virginia. Scale, 



20 miles to i inch. Accompanying "The Mesozoic in 

 Virginia." 



Trans. Amer. Inst. Min. Engrs., vol. vi, pi. 5, Easton, 

 Pennsylvania, 1879. 



The Virginias, vol. i, pp. 124-125, 1880. 



