BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 69 
Ells, R. W— Continued. 
785. Notes on the mineral fuel supply of Canada. — Canada. Roy. Soc, Proe. 
and Trans., 2d ser., vol. 12, sect. 4, pp. 267-290, 1906. Abstract : Science, new 
ser., vol. 23, p. 973, June 29, 1906. 
Describes the occurrence, character, and extent of coal and other mineral fuel re- 
sources of Canada. 
786. Notes on the geology of the islands of Trinidad and Barbados, British 
West Indies. — Canada, Roy. Soc, Proc. and Trans., 3d ser., vol. 1, sect. 4, pp. 
115-130, 1907. 
787. Notes on the geology and mineral resources of Trinidad and Barbados, 
B. W. Islands.— Ottawa Naturalist, vol. 23, no. 5, pp. 73-79, August, 1907. 
788. Report on the geology and natural resources of the area included in 
the northwest quarter sheet, number 122 of the Ontario and Quebec series, com- 
prising portions of the counties of Pontiac, Carleton, and Renfrew. — Geol. Sur- 
vey of Canada, Ottawa, 1!)07. 71 pp., 1 map. 
Elton, H. L. 
Mines of the Taviche district, Oaxaca, Mexico. — See Place and Elton, no. 1936. 
Emerson, Benjamin K. 
789. Quartz after prochlorite at Cranston and Worcester and coal plants at 
Worcester. — Science, new ser., vol. 2(5, p. DOT. December 27, 1907. 
Emerson, Benjamin K., and Perry, Joseph II. 
790. The green schists and associated granites and porphyries of Rhode 
Island.— IT. S. Geol. Survey, Bull. no. 311, 74 pp., 2 pis., 6 tigs., 11)07. 
Describes the occurrence, character, and relations of the pre-Camhrian and Carbonif- 
erous stratified rocks and associated igneous rocks. 
Emmens, Newton W. 
791. The Jones iron fields of New Mexico. — Min. Mag., vol. 13, no. 2, pp. 109- 
11(5, figs., February, 1906. 
Includes a brief account of the geology and occurrence of this iron-ore deposit. 
Emmons, Samuel Franklin. 
792. Biographical notice of George H. Eldridge. — Am. Inst. Min. Eng., Bi-Mo. 
Bull., no. 8, pi). 247-257, March, 1906; Trans., vol. 3.7, pp. 339-340, L907. 
Adds a list of his published papers. 
793. What is a fissure vein? — Econ. Geology, vol. 1, no. 4, pp. 385 387, 1906. 
794. A map and cross-sections of the Downtown district of Leadville I Colo- 
rado ].— Abstract : Science, new ser., vol. 23, pp. 816-817, May 25, 1906. 
795. Useful definitions.— Min. and Sci. Press, vol. 93, pp. 355-356, Septem- 
ber 22, 1906. Proper use of mining terms. — Min. World, vol. 25, no. 24, p. 715, 
December 15, 1906. 
(Jives definitions of various terms employed in economic geology. 
796. Los Pilares mine, Nacozari, Mexico. — Econ. Geology, vol. 1, no. 7, pp. 
629-643, 4 figs., 1906. Abstract: Eng. and Min. Jour., vol. 82, pp. 1066-1067, 2 
tigs.. December 8, 1906. 
Describes the local geology, the character and distribution of the copper ores, mid the 
geologic history of the deposits. 
797. Contributions to economic geology, 1905: Investigation of metalliferous 
ores.— U. S. Geol. Survey, Bull. no. 285, pp. 1 1 19, L906. 
Outlines the work of the U. S. Geological Survey in progress and in course of publica 
tion pertaining to metalliferous ores. 
798. Uinta Mountains.— Geol. Soc America, Bull., vol. 1*. pp. 287 302, 1 pi.. 
2 figs., 1907. 
Reviews previous geologic work in the region, describes the general structure and 
stratigraphic succession of the (Jintas, and discusses die origin of the Green Rl 
