184 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Turner, H. W. 
2398. The Terliugua quicksilver deposits. — Econ. Geology, vol. 1, no. 3, pp 
265-281, 3 figs., December-January, 1905-1906. 
Describes the general geology, the geologic occurrence of the ore deposits, the char 
acter and extent of the lodes, the origin of the ores, and the associated minerals. 
2399. The ore deposits of Copperopolis, California. — Econ. Geology, vol. 2 
no. 8, pp. 797-799, 1907. 
2400. The sodium nitrate deposits of the Colorado. — Min. and Sci. Press, vol 
94, pp. 634-635, 4 figs., May 18, 1907. 
2401. Faulting in the Red Cloud mine [Idaho]. — Min. and Sci. Press, vol. 95 : 
pp. 747-748, 3 figs., December 14, 1907. 
Includes notes on the occurrence of the lead-silver ores. 
Turner, Scott. 
2402. A simple classification of igneous rocks. — Min. and Sci. Press, vol. 94, 
pp. 404-405, March 30, 1907. 
Tyler, Sydney. 
2403. Sau Francisco's great disaster. — Philadelphia, P. W. Ziegler Co., 1906. 
424 pp., illus. 
Includes a chapter by R. S. Tarr on earthquakes and their causes. See no. 2355. 
Tyrrell, J. Burr. 
2404. A Canadian Department of Mines or Geological Survey. — Canadian 
Min. Inst., Jour., vol. 9, pp. 107-111, 1906. 
2405. Vein formation at Cobalt, Ontario. — Canadian Min. Jour., vol. 28, 
no. 12 (new ser., vol. 1, no. 10), pp. 301-303, 3 figs., August 1, 1907. 
2406. Concentration of gold in the Klondike. — Econ. Geology, vol. 2, no. 4, 
pp. 343-349, 2 figs., June, 1907; Canadian Min. Jour., vol. 28, no. 15 (new ser., 
vol. 1, no. 13), pp. 403-405, 4 figs., September 15, 1907. 
» 
Udden, Johan August. 
2407. The origin of the small sand mounds in the Gulf coast country. — 
Science, new ser., vol. 23, pp. 849-851, June 1, 1906. 
Describes occurrence and character of these mounds and suggests hypotheses for their 
explanation. 
2408. Report on a geological survey of the lands belonging to the New York 
and Texas Land Company (Ltd.), in the upper Rio Grande embayment in 
Texas. — Augustana Library Publications, Rock Island, 111., no. 6, pp. 51-107, 
7 pis., 1 map, 1907. 
2409. A sketch of the geology of the Chisos country, Brewster County, 
Texas.— Univ. of Texas, Bull. no. 93 (Sci. ser. no. 11), 101 pp., April 15, 1907. 
Describes the physiography of the region, the occurrence, character, relations, and 
economic value of Ordovician, Carboniferous, Cretaceous, and Tertiary strata, and of 
igneous rocks, the geologic structure and history, and the mineral resources, particularly 
quicksilver and coal. 
Udden, Jon A. 
2410. The Delafield drill core [Illinois].— Illinois State Geol. Survey, Bull, 
no. 4, pp. 203-211, 1907. 
Gives notes upon the strata (coal measures) passed through in the drilling. 
Ulrich, Edward Oscar. 
2411. Systematic paleontology of the Pleistocene deposits of Maryland: 
Molluscoidea.— Maryland Geol. Survey, Pliocene and Pleistocene, pp. 210-212, 
2 figs., 1906. 
