22 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, Ibull.162. 
73 Berkey (Charles P.). Geology of the St. Croix Dalles. II [ Wisconsin], 
Am. Geol., vol. xxi, pp. 139-155, pis. xii-xiii, 1898. 
Describes the igneous rocks and minerals and presents a geologic map 
of the region. 
74 Geology of the St. Croix Dalles. Ill, Paleontology. 
Am. Geol., vol. xxi, pp. 270-294, pis. xvii-xxi, 1898. 
Gives lists of fossils collected from the different beds and describes 
a number of new species. Includes a geologic map. 
75 Bernard (Felix). The principles of paleontology (extracted from 
Bernard's Elements de Paleontologie, Paris, 1895). 
N. Y., 14th Ann. Rept. State Geologist, pp. 131-215, 1897; N. Y. State 
Mus., 48th Ann. Rept., vol. ii, pp. 131-215, 1897. 
76 Beyer (Samuel Walker). Geology of Marshall County [Iowa]. 
Iowa Geol. Surv., vol. vii, pp. 199-262, pis. v-vi, figs. 25-37, with 
geologic map, 1897. 
Describes the physiographic and drainage features, the occurrence 
and character of the Carboniferous subdivisions, and the occurrence of 
building stones and clay. 
77 Bibbins (Arthur). A fossil cypress swamp in Maryland. 
The Plant World, vol. i, pp. 164-166, 1 pi., 1898. 
Describes occurrence on Chesapeake Bay in Cretaceous strata. 
78 Birkinbine (John). Iron ores. 
U. S. Geol. Surv., 19th Ann. Rept., pt. vi, pp. 23-63, pis. i-xi, 1898. 
Includes statistics of production, analyses of iron ores, notes on the 
Marquette iron range, by James E. Jopling, and notes on the iron ores 
of Alabama, by Henry McCalley. 
79 Manganese ores. 
U. S. Geol. Surv., 19th Ann. Kept., pt. vi, pp. 91-125, 1898. 
Includes statistics of production and notes on the manganese ores of 
Virginia, by Charles Catlett. 
80 Bishop (Irving P.). The structural and economic geology of Erie 
County [New York]. 
N. Y., 15th Ann. Rept. State Geologist, vol. i, pp. 17-18, 305-392, pis. 
i-xvi, figs. 1-6, 1897; N. Y. State Mus., 49th Ann. Rept., vol. ii, pp. 
305-392, pis. i-xvi, figs. 1-6, 1898. 
Describes the physiography, the character, and occurrence of the 
Silurian and Devonian subdivisions, the glacial phenomena, and the 
occurrence of building stones and natural gas, with data of the well 
borings. 
81 Blake (William P.). Oscillations of level of the Pacific coast of 
the United States. 
Am. Geol., vol. xxi, pp. 164-165, 1898. 
Describes occurrence of Ocoya Creek formation and its bearing on 
the evidence of a recent uplift of the region. 
82 Anthracite coal in Arizona. 
Am. Geol., vol. xxi, pp. 345-346, 1898. 
Describes occurrence of coal in beds of Carboniferous age and gives 
a ck«Mi«al analysis. 
