BIBLIOGRAPHY OF NOKTH AMERICAN GEOLOGY, 1906 190*7. 75 
Fisher, E. F. 
875. Terraces of the West River, Brattleboro, Vermont- Boston Soc. Nat. 
Hist.. Proa, vol. :;: , ». no. 2, pp. 9 12, 11 pis., 11 figs., 1906. 
Discusses the production of terraces in river valleys by the meandering of the stream 
controlled by rock ledges, basing the study upon the terraces ol the Wesl River in the 
vicinity of Brattleboro, Vt. 
Fisher, O. 
876. A suggested cause of changes of level in the earth's crust. — Am. Jour. 
Sci., 4th ser., vol. 21. pp. 216-220, March. 1906. 
Finds the cause in convection currents in a liquid substratum beneath the cooled crust. 
Flammarion, Camille. 
877. Earthquakes.— Sci. Am. Suppl., vol. 02, pp. 25861-25862, December 
s, loot;. 
Fleck, Herman, and Halclane, Wm. (}. 
878. A study of the uranium and vanadium belts of southern Colorado. — 
Colorado. State Bur. Mines. Kept, tor 1905-6, pp. 47-115, 1<> pis.. 1 fig., 1!)()T. 
Fletcher, Hugh. 
879. Geological work in the northwestern parts of Nova Scotia. — Canada. 
Geol. Survey, Smiiin. Kept, for 1905, pp. lis 122. 1906. 
880. Surveys in western Nova Scotia. — Canada, Geol. Survey, Summ. Etept. 
for 1906, pp. 140-140, 1906. 
(Jives notes on the geology of the area and the occurrence of coal. 
Flores, T. 
881. Le Xinantecatl on volcan Nevado de Toluca. — X e Congr, geol. intern., 
Guide des Excursions, Mexico, no. IX. It; pp., 4 pis., 1900. 
882. Etude miniere du district de Zacatecas [Mexico]. — X e Congr. geol. 
intern., Guide des Excursions, Mexico, no. XVII, 25 pp., 2 pis., 1906. 
Describes the occurrence and character of the ore deposits. 
Etude de la Sierra de Guanajuato. — See Villarello, Flores. and Robles, no. 
2460. 
Foerste, August F. 
883. Silurian clays, with notes on clays of the Waverly and Irvine forma- 
tions [of Kentucky]. — Kentucky Geol. Survey, Bull. no. 5, pp. 143-178, L905. 
Gives chemical analyses, describes the geological position, and discusses possible use-; 
of the various clays. 
884. The Silurian, Devonian, and Irvine formations of east-central Ken- 
tucky, with an account of their clays and limestones.— Kentucky Geol. Survey, 
Bull. no. T, :W.) pp.. 33 pis. (inch 7 maps). 1906. 
Discusses the occurrence and classification of Silurian and Devonian rocks and the 
properties and economic value of their limestones and clays. Also describes and figures 
characteristic fossils of the Silurian formations of east central Kentucky, chiefly from the 
Waco limestone horizon. 
Fohs, F. Julius. 
885. Clays in Crittenden and Livingston counties [Kentucky].- Kentucky 
(led. Survey. Bull. no. <;. pp. 124 112. 1905. 
Describes the occurrence, kinds, origin, and geologic relations. 
886. Classification of' v faults and fractures into series and sets and Its practi 
cal application. — Eng. and Min. Jour., vol. 81, pp. 553 554, March 21. L906. 
Includes notes on faulting in western Kentucky. 
