BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-190*7. 51 
Coleman, Arthur P. — Continued. 
540. Pre-Cambrian nomenclature. — Jour. Geology, vol. 14, uo. 1. pp. 60-64, 
1906. 
Discusses, with regard to the report of the special committee of American mid Canadian 
tfeolo^ists on the nomenclature of the formations of the Lake Superior region, the rela 
tionships of various pre-Cambrian formations in the upper lakes region of Canada and 
their nomenclature. 
541. The Helen iron mine. Michipicoten. — Econ. <;<m>|<>l:\. vol. 1. no. <">. pp. 
521-529, 4 figs., 1906. 
Describes the local geology, the rocks of the iron formation, the character of the ore 
body, and the origin of the ore. 
542. Iron ranges of eastern Michipicoten.— Ontario, Bur. Mines. Rept., L906, 
vol. 15, pt. 1, pp. 17:;-1!)!», i:5 tigs., 1 map, 1906. 
Describes the general features of the area, the occurrence and character of the iron 
deposits, and the Pleistocene geology. 
543. Magmatic segregation of sulphide ores. — Abstract : Lritish Assoc. Adv. 
Sci., Kept. 75th meeting, p. 400, 1906. 
544. A lower Huronian ice age. — Am. Jour. Sci., 4th ser., vol. 2:5, pp. 187- 
192, March, 1907. Abstracl : Science, new ser., vol. 25, p. 7(i<>. May 17, 1907. 
After referring briefly to evidence for ice ages prior to the glacial period, describes 
the Huronian "slate conglomerate" of Ontario, and striated bowlders taken therefrom, 
and discusses the evidence for a lower Huronian ice age. 
545. The need of field work in the study of ore genesis. — Eng. and Min. 
Jour., vol. 83, pp. 295-296, February <>, 1907. 
546. The Sudbury laccolithic sheet. — Jour. Geology, vol. L5, no. 8, pp. 7.~»'.> 
782, 2 rigs., 1907. 
547. Interglacial periods in Canada. — Gongr. geol. intern., < '. R. 10 e sess., 
Mexico, 1906, pp. 1237-1258, 1907. 
548. Iron ranges east of Lake Nipigon. — Ontario. Bur. Mines, 16th Ann. 
Kept., vol. 10, pt. 1, -pp. 105-135, 15 tigs., 1907. 
Describes the geology and the occurrence and character of the iron ores. 
549. Die Sudbury-Nickelerze— Zeitschr. f. prak. Geol., Jg. 15, p. 221, 1907. 
Discusses the origin of the Sudbury. Ontario, nickel ores. 
Report of a special committee on the correlation of the pre-Canibrian rocks of 
the Adirondack Mountains, the "original Laurentian area" of Canada, and 
eastern Ontario. — See Adams and others, no. 13. 
Collen, M. 
550. Copper deposits in the Belt formation in Montana. — Econ. Geol., vol. 2. 
no. (5, pp. 572-575, 1907. 
Colles, George Wet more. 
551. Mica and the mica industry.— Franklin Inst., Jour., vol. 161, no. 1. pp. 
43 58, 5 figs., January, 1906; no. 2. pp. 81 100, <'. figs., February, 1906. Im- 
printed in book form : The Franklin Institute, Philadelphia, L906. 130 pp., 
36 tigs. 
Collier, Arthur J. 
552. Geology and coal resources of the Cape Lisburne region. Alaska. -U. S. 
Geol. Survey, Bull. no. 278, 54 pp.. It pis.. 8 figs., 1906. 
Descrii.es the geography, the stratigraphy, embracing Devonian, Carboniferous, and 
Mesozoic formations and Quaternary deposits, and in detail the coal resources of Jurassic 
and Carboniferous age. 
553. Ore deposits in the St. Joe River basin, [daho. I. S. Geol. Survey, 
Bull. no. 2S5, pp. 12!)- 139, 1 pi., 1 fig., 1906. 
Describe; the geography, drainage, and geoiogj >r the area, and the occurrence and 
character of the mineral resources. 
