80 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, [bull. 271. 
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Leverett (Frank). T 
1. The loess and its distribution. 
Am. Geol., vol. 33, pp. 56-57, 1904. 
2. Review of the Glacial geology of the southern Peninsula of Michigan. 
Mich. Acad. Sci., 6th Rept., pp. 100-110, 1904. 
Discusses the physical features of the southern peninsula, the possible exten- 
sion of the Keewatin ice field over Michigan, evidences in Michigan of suc- 
cessive advances of the Labrador icefield, the location of the ice margin, 
structure of the drift in Michigan, Glacial lakes, origin of the Great Lakes, 
and gives a bibliography. 
3. Glacial geology of the Grand Rapids area [Michigan]. 
Mich. Geol. Surv., vol. 9, pt. 2, pp. 56-59, L904. 
4. Glacial gravels [of the Kittanning quadrangle, Pennsylvania]. 
U. S. Geol. Surv., Geol. Atlas of U. S., folio no. 115, 1904. • 
Levison (W. G.). I 
1. Notes on fluorescent gems. 
Am. Geol., vol. 33, pp. 57-58, 1904. 
Lindgren (Waldemar). 
1. Gypsum deposits in Oregon. 
U. S. Geol. Surv., Bull. no. 223, p. Ill, 1904. 
Describes character, occurrence, economic development, and geologic relatid 
of gypsum deposits in eastern Oregon. 
2. A geological reconnaissance across the Bitterroot Range and Clear- 
water Mountains in Montana and Idaho. 
U. S. Geol. Surv., Professional Paper no. 27. 123 pp., 15 pis., 8 figs., 1904. 
Describes topography and drainage, character, occurrence, and geologic rela- 
tions of igneous and sedimentary rocks of Quaternary, Tertiary, and pre- 
Tertiary age, the geologic structure and history of the area, the character 
and occurrence of gold, silver, copper, and lead ore deposits, and the 
mining developments. 
3. The genesis of the copper deposits of Clifton-Morenci, Arizona. 
Am. Inst. Mg. Engrs., Trans. (Lake Superior meeting, September, 1904). 
(advance separate), 40 pp., 1904. Abstract: Mg. Rep., vol. 50, p. 617, 1904 
Mg. & Sci. Press, vol. 89, p. 438, 1904. 
I ►escribes the general geology, and the character and occurrence of copper or* rj 
deposits, and discusses their origin. 
Lindgren (Waldemar) and Drake (N. F.). 
1. Nampa folio, Idaho-Oregon. 
U. S. Geol. Surv., Geol. Atlas of U. S., folio no. 103, 1904. 
Describes the geography, the geologic history, the occurrence and charade 
of Tertiary strata and igneous rocks and Quaternary deposits, and th< 
economic resources, chiefly placer gold. 
2. Silver City folio, Idaho. 
U. S. Geol. Surv., Geol. Atlas of U. S., folio no. 104, 1904. 
Describes geography, topography, and drainage, the general geologic histon 
and structure, the character and occurrence of igneous rocks and sedimen 
tary deposits of Tertiary and Quaternary age, and the economic resources 
chiefly precious metals. 
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