82 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [buix.149. 
639 Smyth (Henry Lloyd). Magnetic observations in geological map- 
ping. 
Am. Inst. Mg. Engrs., Trans., vol. xxvi, pp. 640-709, 27 figs., 1896. 
Describes tlie magnetic rock of the Lower Hnronian series in the 
Upper Peninsula of Michigan, and the instruments and methods of work. 
(Jives the results of tracing magnetic rocks by the disturbances pro- 
duced in the instruments. 
640 and Finlay (J. Ralph). The geological structure of the west- 
ern part of the Yermilion range, Minnesota. 
Am. Inst. Mg. Engrs., Trans., vol. xxv, pp. 595-645, figs. 1-11, 1896. 
Eeviews the literature on this region, describes the character, relations, 
and distribution of the sedimentary and igneous rocks, and discusses 
the geologic structuro, the origin of the conglomerate breccias, and the 
general features of the ore deposits. 
041 Spencer (Arthur 0.). A preliminary note on the geology of Mas- 
sanutten Mountain in Virginia. 
Johns Hopkins Univ. Circ, vol. xv, pp. 13-14, 1895. 
Describes the deformation of the region and the character of the Silu- 
rian strata. 
642 Spencer (J. W.). Geographical evolution of Cuba. 
Geol. Soc. Am., Bull., vol. vii, pp. 67-94, figs. 1-13, 1896. 
Describes the topography, hydrography, igneous and metamorphic 
rocks, and the history of the Cretaceous, Tertiary, and Pleistocene forma- 
tions. Gives an account of the occurrence of terraces, sea caves, and 
modern coralline limestones or reefs, and a table showing the geologic 
succession in Cuba. 
643 Geological canals between the Atlantic and Pacific oceans. 
Abstract: Am. Assoc. Adv. Sci., Proc, vol. xliv, p. 139 (^ p.), 1896. 
Brief statement regarding the occurrence of such phenomena on the 
Isthmus of Tehaimtepec, Mexico. 
644 Eecent elevation of New England. 
Abstract: Am. Assoc. Adv. Sci., Proc, vol. xliv, pp. 139-140 (£ p.), 1896. 
Discusses the origin of the terraces of the valleys of New England. 
645 Niagara as a timepiece. 
Pop. Sci. Mo., vol. xlix, pp. 1-19, figs. 1-17, 1896. 
Describes the geologic history and erosion of Niagara River. 
646 How the Great Lakes were built. 
Pop. Sci. Mo., vol. xlix, pp. 157-172, figs. 1-15, 1896. 
Describes the geologic history of the Great Lakes region. 
647 Stanton (Timothy W.). The faunal relations of the Eocene and 
Upper Cretaceous on the Pacific Coast. 
U. S. Geol. Surv., 17th Ann. Rept., Pt. I, pp. 1011-1048, pis. lxiii-lxvii, 
1896. 
Gives an account of the local features and stratigraphy of ike forma- 
tions and describes some Lower Tejon species. 
