84 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Grabau, Aniadeus W. — Continued. 
996. Studies of Gastropoda. III. On orthogenetic variation in Gastropoda. — 
Am. Naturalist, vol. 41, pp. 607-646, 3 pis., October, 1907. 
The study is based in part upon fossil material. 
997. Subaerial erosion cliffs and talus in the lower Devonic of Michigan. — 
Abstract: Science, new ser., vol. 25, pp. 295-296, February 22, 1907. 
998. Types of cross-bedding and their stratigraphic significance. — Abstract: 
Science, new ser., vol. 25, p. 296, February 22, 1907. 
999. Geology and scenery of the Upper Genesee falls. — Science, new ser.. 
vol. 25, pp. 538-539, April 5, 1907. 
1000. Age and stratigraphic relations of the Ohattanoo.ua black shale. — 
Abstract: Science, new ser., vol. 25, p. 771, May 17, 1907. 
1001. The Medina sandstone problem. — Abstract: Science, new ser., vol. 25. 
pp. 771-772. May 17, 11107. 
1002. The Sylvania sandstone — a study in paleogeography. — Abstract: Sci- 
ence, new ser., vol. 26, p. 832, December 13, 1907. 
1003. Seventh international zoological congress — section of paleozoology. — 
Science, new ser.. vol. 26, pp. 881-883, December 20, 1907. 
Gives an account of the proceedings of the meeting held in Boston, August 1D-24, 
1907, and the titles of the papers presented. 
1004. Evolution of some Devonic spirifers. — Abstract : New York Acad. Sci., 
Annals, vol. 17, pt. 3, pp. 574-575, 1907. 
Grabau, Amadeus W., and Shinier, Hervey Woodburn. 
1005. North American index fossils. — School of Mines Quart., vol. 27, no. 2. 
pp. 138-243, 175 figs., January, 1906; vol. 38, no. 1, pp. 20-100. 46 figs., Novem- 
ber, 1906. 
Gives hrief descriptions of "index" fossils: species, genera, and higher groups, with 
keys to the genera. Includes references to the literature. 
1006. North American index fossils. II. — School of Mines Quart, vol. 28, 
no. 2, pp. 150-221, 89 figs., no. 3, pp. 251-352, 165 figs., 1907. 
(lives brief descriptions and synoptic tables of the brachiopods. 
Graham, Blakely. 
1007. The Cooney district. New Mexico. — Eng. and Min. Jour., vol. 82, pp. 
731-732, October 20, 1906. 
Includes notes on the geology and the occurrence of the ores. 
Graham, R. P. D. 
1008. Note on two interesting pseudomorphs in the McGill University min- 
eral collection. — Am. Jour. Sci.. 4th ser.. vol. 22, pp. 47-54, 3 figs., July. 1906. 
Describes pseudomorphs after laumontite from Quebec and corundum from Ontario. 
Graichen, W. 
1009. Das Kupfer-Gold-Lager von Globe, Arizona. — Zeitschr. f. prak. Geol., 
Jg. 13, Heft 1, pp. 39-40, 1 fig.. January. 1905. 
Describes the occurrence of gold-copper ore near Globe. Arizona. 
Granberry, J. H. 
1010. Magnetite deposits and mining at Mineville" N. Y. — Eng. and Min. 
Jour., vol. 81, pp. 890-893, 986-989, 1035-1038, 1082-1084, 1130-1132, 1178-1179, 
26 figs., 1906. Reprinted (with revisions by the author) under the title: The 
Port Henry iron mines. 
Describes the geology and discusses the origin and occurrence of the ores and the mining 
operations. 
