yO BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, [bull. 271 
N. 
Nansen (Fridtjof). 
1. The bathjmetrical features of the north Polar seas, with a discus 
sion of the continental shelves and previous oscillations of th< 
shore line. 
The Norwegian North Polar Expedition, 1893-1896; Scientific Results, vol. 4 
XIII, 231 pp., 29 pis., 1904. 
Includes in the discussion an account of the continental shelves of Greenlam 
and the North American coast. 
Neumayer (L.). 
1. Die Koprolithen des Perms von Texas. 
Palaeontographiea, vol. 51, pp. 121-128, 1 pi., 1904. 
Describes the occurrence and character of coproliths from the Permian c 
Texas. 
New York State Museum. 
1. Economic geology of New York. 
N. Y. State Mus., Handbook 17, 40 pp., 1904. 
Gives brief accounts of the occurrence and utilization of mineral products c 
the state of New York. 
Nicol (William). 
1. Spinel twins of pyrite. 
Am. Jour. Sci., 4th ser., vol. 17, p. 93, 1904. 
Nordenskjold (Otto). 
1. Notes on some specimens of rocks collected by C. Kruuse on th 
east coast of Greenland, between lat. 65° 35' and 67° 22' N. 
Meddelelser oin Gronland, vol. 28, pp. 1-16, 1 pi., 1904. 
o. 
Obalski (J.). 
1. On a mineral containing radium in the Province of Quebec. 
Can. Mg. Rev., vol. 23, pp. 114-116, 1904; Eng. & Mg. Jour., vol. 77, p. 44 
1904; Can. Mg. Inst., Jour., vol. 7, pp. 245-256, 8 figs., 1905. 
Describes the occurrence and characters of a mineral, eleveite, containir 
radium. 
Ogilvie (I. H.). 
1. Geological notes on the vicinity of Banff, Alberta. 
Jour. Geol., vol. 12, pp. 408-414, 4 figs, 1904. 
Describes the general geology and the character and origin of physiograph 
features of this region. 
2. The effect of superglacial debris on the advance and retreat of sorr 
Canadian glaciers. 
Jour. Geol., vol. 12, pp. 722-743, 11 lig.s., 1904. 
