18 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Babcock, E. J., and Clapp, C. H. 
92. Economic geology of North. Dakota clays. — North Dakota State Geol. 
Survey, 4th Bienn. Kept., pp. 95-1S9, 8 pis., 1906. 
Bagg, Rufus M., jr. 
93. The minerals of Maguarichic [Mexico]. — Eng. and Min. Jour., vol. 80, 
pp. 2-3, 4 figs., July 6, 1905. 
Gives notes on the geology of the region, and the occurrence and character of selenite, 
fluorite, and calcite crystals. 
94. Fault breccia veins in the Sierra Madre [Mexico]. — Min. and Sci. Press, 
vol. 92, p. 125, 4 figs., February 24, 1906. 
Discusses the origin of these mineral-bearing lodes. 
Bailey, Gilbert E. 
95. The saline deposits of California. — California State Min. Bur., Bull. no. 
24, 216 pp., pis., figs., maps, 1902. 
96. The desert : its resources, water supply, and development. — Min. World, 
vol. 23, no. 17, pp. 471^73, map, October 28, 1905. 
Describes the physical features of the desert region of southern California, Nevada, and 
Arizona. 
97. The borax deposits of California. — Min. World, vol. 24, no. 1, pp. 4-5, 
7 figs., January 6, 1906. 
Bailey, L. W. 
98. The gypsum deposits of New Brunswick. — Canada, Roy. Soc, Proc. and 
Trans., 2d ser., vol. 12, sec. 4, pp. 3-14, 7 pis., 1906. Abstract : Science, new 
ser., vol. 23, pp. 971-972, June 29, 1906. 
Describes the geologic occurrence and relations of the gypsum beds of New Brunswick, 
particularly those in the vicinity of Hillsborough, and discusses the origin of the gypsum 
deposits. 
Bain, H. Foster. 
99. Zinc and lead deposits of the upper Mississippi Valley. — U. S. Geol. 
Survey, Bull. no. 294, 155 pp., 16 pis., 45 figs., 1906 ; Wisconsin Geol. and Nat. 
Hist. Survey, Bull. no. 19, 155 pp., 45 figs., 18 pis. (in atlas), 1008. 
Gives a historical sketch of the development of the field, describes the topography, 
stratigraphy, and geologic structure, the character, occurrence, and relations of the ore 
deposits, and the mining developments, and discusses the origin of the ores. 
100. [The coals of Illinois.]. — Illinois State Geol. Survey, Bull. no. 3, pp. 
9-19, 1 pi., 1906. 
Gives various data regarding the coal fields of Illinois. Includes a geologic map 
showing the distribution of the coal measures. 
101. A .Nevada zinc deposit.— U. S. Geol. Survey, Bull, no 285, pp. 166-169, 
1906. 
Describes the geologic structure of Spring Mountains, and the character and occur- 
rence of the ore bodies, and discusses the origin of the ores. 
102. The southeastern Illinois oil field.— Min. and Sci. Press, vol. 92, p. 326, 
May 19, 1906. 
Describes the occurrence and character of oil in this area. 
103. A persistent error. — Science, new ser., vol. 23, p. 919, June 15, 1906. 
Calls attention to the misuse of the terms " Des Moines " and " Missourian " applied 
to coal measures of the western interior States. 
104. Sedi-genetic and igneo-genetic ores. — Econ. Geology, vol. 1, no. 4, pp, 
331-339, 1906. 
Presents a classification of the metal production of the United States according to the 
mode of concentration of the ores, with a discussion of the data used, 
