52 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907, 
Collier, Arthur J. — Continued. 
554. Gold-bearing river sands of northeastern Washington. — U. S. Geol. 
Survey, Bull. no. 315, pp. 56-70, 1907. 
Describes the general geology and geologic history of the region, the occurrence of 
gold-bearing placers, and their relation to the terraces. 
555. The Arkansas coal field.— U. S. Geol. Survey, Bull. no. 316, pp. 137-160, 
1 pi., 1007. 
556. The Arkansas coal field. With reports on the paleontology by David 
White and G. H. Girty.— U. S. Geol. Survey, Bull. no. 326, 1907. 158 pp., 6 pis., 
29 figs. 
Describes the stratigraphy and structure, and the occurrence and character of the coals 
of western Arkansas. 
The production in the United States in 1906 of chromite or chrbmic iron ore; 
and of talc and soapstone. — See no. 2419. 
Collins, Edgar A. 
557. The Combination Mine. Early developments and geologic structure. — 
Min. and Sci. Press, vol. 95, pp. 397-399, 435-438, 5 figs., 1907. 
Describes the local geology and occurrence and character of ores in the Goldfleld mining 
district. Esmeralda County, Nevada. 
558. A prospecting shaft in the Goldfield district, Goldfleld, Nevada. — Inst. 
Min. and Metall., Trans., vol. 15. pp. 540-542, 1906. 
Describes the geology and occurrence of the ore bodies. 
Collins, Henry E. 
559. Notes on the wollastonite rock mass, and its associated minerals, of 
the Santa Fe mine, State of Chiapas, Mexico. — Min. Mag., vol. 13, pp. 356-362, 
December, 1903. 
Collins, W. II. 
560. [.Report on] the Lake Superior region between the Pic and Nipigon 
rivers.— Canada, Geol. Survey, Smiim. Rept. for 1905, pp. 80-82, 1906. . 
Gives notes upon the physical features and general, geology of the area examined. 
561. On surveys along the National Transcontinental Railway location 
between Lake Nipigon and Lac Seul. — Canada Geol. Survey, Summ. Kept, for 
1906, pp. 103-109, 1906. 
Includes a brief account of the region and its mineral deposits. 
Colorado, State Bureau of Mines. 
562. Report of the State Bureau of Mines for the years 1905-6. 127 pp., 
illus., 1907. 
Contains notes on the occurrence of mineral resources. Includes a paper by Fleck and 
Haldane on uranium and vanadium deposits. See no. 878. 
Comstock, Theodore B. 
563. Geological notes. — Southern California Acad. Sci., Bull., vol. 1, pp. 
74-77, 1902. 
Discusses the subject of subsidence and elevation in California and the later geological 
history of the southern portion of the State. 
564. The U. S. Geological Survey. — Science, new ser., vol. 25, pp. 309-311, 
February 22, 1907. 
Condon, Thomas. 
565.' A new fossil pinniped (Desmatophoca oregonensis) from the Miocene 
of the Oregon coast. — Oregon Univ. Bull., Suppl. to vol. 3, no. 3, 14 pp., 2 pis., 
3 figs., May, 1906. 
