182 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Thompson, Phillips. 
2369. Iron ore in Ontario. — Eng. and Min. Jour., vol. 81, pp. 719-720, April 14 
1906. 
Gives notes upon the occurrence and character of the iron ores. 
2370. The Sudbury nickel region. — Eng. and Min. Jour., vol. 82, pp. 3-4, 
2 figs., July 7, 1906. 
Describes the geology and occurrence of the nickel ores of the Sudbury region, Ontario. 
2371. Coal in Alberta. — Eng. and Min. Jour., vol. 82, p. 924, November 17, 
1906. 
Describes the occurrence of coal beds in Alberta, Canada. 
Thomson, Elihu. 
2372. The nature and origin of volcanic heat. — Science, new ser., vol. 24, 
pp. 161-166, August 10, 1906. 
Tiffany, J. E. 
2373. Virginia anthracite field. A region showing coal formations, the values 
of which have not yet been thoroughly proved by prospecting. — Mines and 
Minerals, vol. 26, no. 8, pp. 349-350, March, 1906. 
Tight, W. G. 
2374. Pleistocene phenomena in the Mississippi basin ; a working hypothesis. — 
Abstract : Geol. Soc. America. Bull., vol. 17, p. 730, 1907. 
2375. Preglacial drainage in the Mississippi Valley ; a working hypothesis. — 
Abstract : Science, new ser., vol. 25, pp. 772-773, May 17, 1907. 
Tilg'hman, Benjamin Chew. v 
2376. Coon Butte, Arizona. — Philadelphia Acad. Nat. Sen, Proc, vol. 57, pt. 3, 
pp. 887-914, 1906. 
Discusses the origin of the " crater " at this locality. 
The geology of Coon Butte, Arizona. — See Barringer and Tilghman, no. 153. 
Todd, James E. 
2377. Some variant conclusions in Iowa geology. — Iowa Acad. Sci., Proc, 
vol. 13, pp. 183-186, 1906. 
Discusses certain geologic features in Iowa upon which the writer has readied different 
conclusions from those previously recorded by others. 
2378. More light on the origin of the Missouri River loess. — Iowa Acad. 
Sci., Proc, vol. 13, pp. 187-194, 1906. 
Describes a deposit in South Dakota formed in Lake Dakota in late glacial time and 
discusses the bearing of the evidence it offers and that of similar deposits upon the origin 
of the loess. 
2379. Recent alluvial changes in southwestern Iowa. — Iowa Acad. Sci., Proc, 
vol. 14, pp. 257-266, 3 figs., 1907. 
2380. Effects of certain characteristics of rocks on their erosion. — Iowa Acad. 
Sci., Proc, vol. 14, pp. 267-270, 1907. 
Tolman, Cyrus F., jr. 
2381. Methods of investigating problems in faulting. — Min. Mag., vol. 13, no. 
2, pp. 99-108, 6 figs., February, 1906. 
2382. How should faults be named and classified? — Econ. Geology, vol. 2, 
no. 5, pp. 506-511, 1907. 
Tomlinson, W. H. 
2383. Determination of minerals by petrographical methods. — Mineral Col- 
lector, vol. 13, no. 6, i»]). SIMM), August, 1906. 
