BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 175 
Springer, Frank. 
2267. Discovery of the disk of Onychocrinus, and further remarks on the 
Crinoidea Flexibilia. — Jour. Geology, vol. 14, no. 6, pp. 467-523, 4 pis., 1906. 
Describes the ventral structure of Onychocrinus and discusses the relation of various 
members of the Flexibilia and the evolution of certain structural features. Gives a 
synoptic arrangement of the genera. 
Springer, Frank, and Slocom, Arthur Ware. 
2268. Hypsocrinus, a new genus of crinoids from the Devonian. — Field 
Columbian Mus., Geol. Ser., vol. 2, no. 9, pp. 267-271, 1 pi., 1906. 
Spurr, Josiah Edward. 
Genetic relations of the western Nevada ores. — Am. Inst. Min. Eng., Trans., 
vol. 36, pp. 372-402, 1906 (Bi-Mo. Bull. no. 5, pp. 939-969, 1905).— See Spurr, 31, 
page 319 of Bulletin no. 301, U. S. Geol. Survey. 
2269. What is a fissure vein? — Econ. Geology, vol. 1, no. 3, pp. 282-285, 
Decern 1 >er-Ja nua ry, 1 1 105-1 ! >06. 
2270. The southern Klondike district, Esmeralda County, Nev. A study 
in metalliferous quartz veins of magmatic origin. — Econ. Geology, vol. 1, no. 4, 
pp. 369-382, 1 fig., 1906. 
Describes the general geology, the character of the igneous rocks, and the occurrence 
and origin of the gold and silver ores. 
2271. Ore deposits of the Silver Peak quadrangle, Nevada. — U. S. Geol. Sur- 
vey, Prof. Paper no. 55, 174 pp., 24 pis., 40 figs., 1906. 
Describes the character, occurrence, and relations of Cambro-Ordovician, Tertiary, and 
Quaternary sediments, of pre-Tertiary igneous rocks, of Tertiary and Quaternary lavas, 
and of the gold and silver ores and other economic minerals, and the mining operations, 
and discusses the genetic relations of ore deposits and the theory of metalliferous veins 
of magmatic quartz. 
2272. How should faults be named and classified? — Econ. Geology, vol. 2, 
no. 2, pp. 182-184, no. 6, pp. 601-602, 1907. 
2273. A theory of ore deposition. — Econ. Geology, vol. 2, no. 8, pp. 781-795, 
1907. 
2274. The Goldfields district, Nevada. — Abstract: Franklin Inst, Jour., vol. 
164, no. 2, pp. 155-160, August, 1907. 
Describes the geology and the characler, occurrence, and origin of the ores. 
Spurr, Josiah Edward, and Garrey, George H. 
2275. The Idaho Springs mining district, Colorado. — U. S. Geol. Survey, Bull, 
no. 2S5, pp. 35-40, 1906. 
Describes the general geology, the placer deposits, the character and occurrence of 
the ores, and the types of veins. 
Stafford, (). F. 
2276. The mineral resources and mineral industry of Oregon for 1903. — 
Oregon Univ., Bull., new ser., vol. 1, no. 4, 112, viii pp., 5 pis., 1904. 
Stanley, F. C. 
On the chemical composition of amphibole. — See Penfield and Stanley, no. 
1893. 
Stauffer, (Mint on R. 
2277. The Hamilton in Ohio.— Jour. Geology, vol. 15, no. 6, pp.' 590-596, 1907. 
Describes the occurrence, character, and relations of various Devonian formations 
of iiir state of Ohio, more particularly those considered to be of Hamilton age. 
2278. The Devonian limestones of central Ohio and southern Indiana. — Ohio 
Naturalist, vol. 7, no. 8, pp. 184-186, June. 1 i>< >T. 
Discusses the correlation of Devonian formations on the opposite sides of tin 1 Cincin- 
nati anticline. 
