62 
447 Lindgren (Waldemar). Nevada City special folio, California. 
U. S. Geol. Surv., Geol. Atlas of U. S. ; folio No. 29, 1896; Abstract: 
Mining and Scientific Press, vol. lxxiii, pp. 480 and 502, 1896. 
Describes tbe physiographic and general geologic features of the 
quadrangle, the character and distribution of the Paleozoic, Neocene 
and Pleistocene strata, and of the igneous rocks, and the occurrence of 
auriferous gravels and gold quartz veins. Includes topographic, geo- 
logical, aud structure section maps. 
448 Pyramid Peak folio, California. 
U. S. Geol. Surv., Geol. Atlas of U. S., folio No. 31, 189(3. 
Includes a description of the geology of the gold belt of California. 
Describes the topography, the character aud distribution of the Carbon- 
iferous and Juratrias, Neocene, and Pleistocene formations and of the 
igneous rocks and the occurrence of auriferous gravels. Includes 
topographic, geologic, and structure section maps. 
448a The gold quartz veins of Nevada City and Grass Valley 
districts, California. 
U. S. Geol. Surv., 17th Ann. Kept., Pt. II, 262 pp., 24 pis., 37 tigs., 1896. 
Describes the character and distribution of the igneous and sedimen- 
tary rocks and of the ore bodies. Discusses the origin of the ores and 
of the vein systems, and includes detailed descriptions of mines. 
449 Age of tbe auriferous gravels of the Sierra Nevada. With a 
report on the flora of Independence Hill [California]. 
Jour, of Geol., vol. iv, pp. 881-906, 1896. 
Eeviews the paleobotanical evidence of the age of the beds aud dis- 
cusses the post-Jurassic history of the Sierra Nevada and the correla- 
tion of these beds with those of the Coast ranges. 
450 The gold quartz veins of California. 
Am. Geol., vol. xvii, pp. 338-339 (correspondence), 1896. 
Refers to an article by H. W. Fairbanks on "The mineral deposits of 
eastern California," and to certain criticisms on the author's former 
paper on the gold quartz veins of California. 
451 Lobley (J. Logan). The foldings of the rocks. 
Sci. Amer. Suppl., vol. xlii, pp. 17225-17226, 1896. 
Describes the foldings of rocks in North America aud in other parts of 
the world. 
452 Loring (Prank C). Mineral resources of British Columbia. 
Eng. and Mg. Jour., vol. lxii, p. 148 (i p.), 1896. 
Gives a brief note on the occurrence and extent of the Trail Creek ore 
bodies. 
453 Lucas (A. P.). The Avery Island salt mine aud the Joseph Jeffer- 
son salt deposit, Louisiana. 
Eng. and Mg. Jour., vol. lxii, pp. 163-464, 1896. 
Describes the occurrence of salt and the system of mining. 
454 Luquer (Lea McL). The mineral of the pegmatite veins at Bed 
ford, N. Y. 
Am. Geol., vol. xviii, pp. 259-260, 1896. 
Contains brief notes on the minerals occurring in these veins. 
