BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 123 
Leith, Charles Kenneth — Continued. 
1552. Iron ores of the western United States and British Columbia. — U. S. 
Geol. Survey, Bull. no. 285, pp. 104-200, 1906. 
Gives a summarized account of the iron-ore deposits of Wyoming, Washington, British 
Columbia, Colorado, California, and Utah. 
1553. Review of ''Cobalt nickel arsenides and silver." by Willet (J. Miller 
(13th Report of the Ontario Bureau of Mines, 1004, part 1, and 14th report, 
L905, part 2).— Econ. Geology, vol. 1. no. 3. pp. 295-298, December-January. 
1005-1 000. 
1554. Iron ore reserves— Econ. Geol., vol. 1. no. 4. pp. 360-368, 1906; Smith- 
sonian Inst.. Ann. Rept. for 1006, pp. 207-214, 1007. 
Discusses estimates as to the extent of the world's supply of iron ore. and uives a 
general account of the iron ore deposits of the United Stntcs. 
1555. The university training of engineers in economic geology. — Econ. 
Geology, vol. 1. no. 5, pp. 470-1S1. 1006. 
1556. Review of "The geology of the Granby area," by E. R. Buckley ami , 
II. A. Buehler (Missouri Bureau of Geology and Mines, 2d ser.. vol. 4i. — Econ. 
Geology, vol. 1, no. 8, pp. 811-816, 1006. 
1557. The geology of the Cuyuna iron range, Minnesota. — Econ. Geology, 
vol. 2. no. 2. pp. 145-152. 1007. 
Descrihes the geologic formations and structure of the region and the occurrence and 
Keolojdc relations of the iron ores. 
1558. The metamorphic cycle. — Jour. Geology, vol. 15, no. 4, pp. 303-313 
2 figs.. 1007. 
The pre-Cambrian volcanic and intrusive rocks of the Fox River Valley, 
Wisconsin. — See Hobbs and Uoith. no. 110.°,. 
Lenher, Victor. 
Marignacite, a new variety of pyrochlore from Wausau, Wisconsin. — See 
Weidman and Lenher, no. 2513. 
Leonard, Arthur Gray. 
1559. Geology of Clayton County [Iowa]. — Iowa Geol. Survey, vol. 16, pp. 
213-307. 5 pis.. 10 fiirs.. 2 geol. maps, 1006. 
Descrihes the physiography, the stratigraphy, including Camhrian, Ordovician, and 
Silurian strata and glacial deposits, and the economic resources. 
1560. The North Dakota-Montana lignite area. — U. S. Geol. Survey. Bull. 
no. 285, pp. 316-330, 1006. 
Descrihes the stratigraphy of the lignite region and the character and composition 
of the coals. 
1561. What should appear in the report of a state geologist? — Econ. Geology, 
vol. 1, no. 6, pp. 570-571, 1006. 
Geology, vol. 1, no. 6, pp. 570-571, 1906. 
1562. Administrative report. — North Dakota State Geol. Survey, 4tli Bienn. 
Rept., pp. 1-7. 1006. 
1563 Stratigraphy of North Dakota clays. — North Dakota State Geol. Sur- 
vey, itb Bienn. Rept., pp. 63-94, 4 pis., 1006. 
Descrihes the distrihution and character of Cretaceous and Tertiary formations, and 
the occurrence and composition of their shales and clays. 
1564. The coal fields of parts of Dawson, Rosebud, and Custer counties. 
Mont.— U. S. Geol. Survey, Bull. no. 316, pp. 104 211. 1 pi., 1007. 
LePrieur, Peyraud, and Rufz. 
Eruption du volcan de la Montagne Pelee, 1851. Translated by 4'. A. Jaggar, 
jr. — See no. 1280. 
