278 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Virginia. 
General. 
Composition of waters of Rockbridge 
County and their relations to 
the geological formations : White, 
2537. 
Geography : Surface, 2327. 
Pine Mountain region : Stone, 2313. 
Economic. 
Anthracite coal : Griffith, 1041 ; Tif- 
fany, 2373. 
Barite deposits : Watson, 2491. 
Barytes industry : Judd, 1331. 
Cement and cement materials : Bassler, 
158. 
Cement resources of the Cumberland 
Gap district : Eckel, 766. 
Clays: Ries, 2060, 2064. 
Copper deposits : Watson, 2487 ; Weed 
and Watson, 2504. 
Luray : Phalen, 1919. 
Virgilina: Judd, 1328. 
Dante, coal : Stone, 2312. 
Floyd County, nickel : Watson, 2490. 
Iron: Holden, 1201. 
New River-Cripple Creek district : 
Holden, 1200. 
Oriskany and Clinton : Eckel, 765. 
Lead and zinc deposits : Watson, 
2484. 
Mineral resources : Watson, 2493. 
Russell Fork coal field: Stone, 2311. 
Rutile: Catlett, 445: Watson, 2493. 
St. Mary's quadrangle : Shattuck, 2185. 
Slate : Dale and Eckel, 625. 
Virgilina copper belt : Judd, 1328. 
Zinc deposits : Payne, 1886 ; Watson, 
2484. 
Physiographic. 
Physiography : Surface, 2326. 
Btratigraphic. 
Coastal plain : Clark and Miller, 489. 
Cambrian and Ordovician : Bassler, 
158. 
Cretaceous: Clark, 483. 
St. Mary's quadrangle : Shattuck, 
2 I 85. 
Paleontology. 
Pleistocene plants : Berry, 217. 
Prorosmarus alleni from the Miocene : 
Berry and Gregory, 227. 
Petrology. 
Albite from Amelia, analysis of : Er- 
ben and Ceipek, 811. 
Dike of diabase in Potsdam sandstone : 
Watson, 2489. 
Granites: Watson, 2485. 
Unakite : Watson, 2486. 
Volcanic ash. 
Colorado, Durango : Woolsey, 2633. 
Nebraska, Republican River Valley : 
Co'ndra, 570. 
Origin : Hixon, 1175. 
Vglcanoes. 
General: Barus, 155 ; Jaggai*, 1282 ; 
Mercalli, 1710; Pickering, 1928. 
Volcanoes— Continued. 
General — Continued. 
Cause of : Barus, 154 ; Louderback, 
1619; See, 2158. 
Fumaroles, production of sulphate 
of soda in : Lacroix, 1454. 
Mud flows : Lacroix, 1446. 
Radioactivity, relation to volcanism : 
Button, 752. 
Seismic phenomena, connection with 
volcanism : Heilprin, 1124, 1125. 
Systems of western hemisphere : 
Hill, 1149. 
Volcanic domes, formation of : La- 
croix, 1451. 
Volcanic heat, nature and origin of : 
See, 2160; Thomson, 2372. 
Volcanic necks, examples of : Or- 
donez, 1824. 
Volcanism and thermal waters : 
Gautier, 934. 
Alaska : Crosby, 602. 
Bogoslof group : Haven, 1097. 
Costa Rica : Jones, 1322. 
Dominica, boiling lake of : Hovey, 
1222. 
Hawaii: Hitchcock, 1166, 1167; Pick- 
ering, 1927. 
Mexico: Aguilera, 19, 20; Cadell, 378; 
Cleland, 505; Hobson, 1196; 
Koenigsberger, 1422. 
Citlaltepetl and Popocatepetl : 
Keyes, 1391. 
Colima : Diaz, 719 ; Dodge, 726 ; 
Waitz, 2466. 
Colima, Toluca, and Popocatepetl: 
Hovey, 1239. 
Jorullo : Ordonez, 1831. 
Nevado de Toluca and Jorullo : Hob- 
son, 1195. 
Valle de Santiago, explosion craters : 
Ordonez, 1832. 
Xinantecatl : Fibres, 881. 
Mont Pele : Anderson, 48 ; Gentil, 
938 ; Lacroix, 1455 ; Lappa rent, 
1521 ; Wegener, 2508-2510. 
eruptions : Berte, 228 ; Curtis, 613 ; 
Deckert, 699; Geinitz, 936; 
Heilprin, 1121; Issel, 1278; 
Jaccaci, 1279 ; Lacroix, 1447 ; 
Milne, 1760; Verri, 2444. 
former eruptions : Jaggar, 1280 ; 
Mercalli, 1709. 
present condition: Heilprin, 1122; 
Hovey, 1220. 
shattered obelisk: Heilprin, 1123. 
Nicaragua : Chamberlin, 451 ; Jones, 
1322. 
Saint Lucia, Soufriere of : Hovey, 
1221. 
Saint Vincent, eruptions : Anderson, 
48 ; Deckert, 699 ; Geinitz, 936 ; 
Lacroix, 1448. 
San Andres, postparoxysmal phe- 
nomena : Waitz, 2464. 
Tonopah : Lakes, 1469. 
