Geology and Mineralogy. 249 



4. The Moraines of Southeastern South Dakota and their 

 Attendant Deposits; by James E. Todd. U. S. Geol. Survey, 

 Bulletin 158, pp. 1-168. — This report is a description of the 

 Pleistocene deposits of the Dakota - Nebraska region. The 

 deposits are described as a first or outer moraine which extends 

 down to the Missouri River, a second moraine bordering a region 

 farther north, and various forms of drift outside the moraines. 

 The drift region beyond the outer moraine is largely loess and 

 Prof. Todd describes at some length the distribution character of 

 these interesting deposits. The Missouri River is believed by 

 the author to have been largely excavated since the ice age and, 

 furthermore, that the river is still deepening its trough. 



H. E. G. 



5. Preliminary Rep>ort on the Copper-bearing Rocks of Douglas 

 County, Wis. ; by U. S. Grant. Wisconsin Geol. and Nat. 

 Hist. Surv. Econ. Series, No. 3, Bulletin VI. Pp. 55, maps and 

 plates. Madison, 1900. — This work has for its purpose a study of 

 the copper-bearing rocks of the Keweenawan series in the region 

 southeast of Duluth and Superior, the so-called Douglas Copper 

 Range, to ascertain the character and value of the copper deposits. 

 The rocks and the occurrence of the ores are quite similar to 

 what is found in the well-known region of Keweenaw Point. The 

 promise of valuable deposits is not, however, very great, the cop- 

 per being scattered so much as to make in general very lean ores. 

 While the value of the work is chiefly local, it will also prove of 

 interest to all who are interested in the origin and occurrence of 

 ore deposits. l. v. p. 



6. Bxdletins of the Geological Survey of Finland, No. 9. 

 Esquisse hypsometrique de la Finlande ; by J. J. Sedeeholm. 

 Pp. 17, 8vo. Helsingfors, 1899. — This is a short description of a 

 relief map of Finland on a scale of 1 : 2,000,000, in which the main 

 features of the topographic relief are brought out and described. 



No. 10. Les depots Quaternaires en Finlande, by J. J. Sedee- 

 holm (pp.28, 1899). This little work contains a brief but very 

 good description of the glacial deposits of Finland and is accom- 

 panied by an excellent map on the same scale as the preceding 

 one. The differences of relative level of land and sea at different 

 times, the movement of the ice and the remarkable and celebrated 

 osar, colossal glacial embankments crossing the country in long 

 lines and well shown on the map, are described and discussed. 



No. 11. Neue Mitteilungen uber das Jjolitmassiv in Kuusamo, 

 by V. Hackmann (pp. 45, 8vo, 1900). Jjolite is a name given 

 by Ramsay and Berghell to the rock forming a mountain mass 

 composed of pyroxene and nephelite and of granular structure. 

 Recently Hackman has studied this occurrence in the field and 

 gives a full description, showing it to be a complex of alkaline 

 rocks ranging from ijolite through essexite into pyroxene-syenite. 

 The ijolite is the main type. Several new analyses are given and 

 the whole is an interesting conti'ibution to the petrography of the 

 alkaline rocks. l. v. p. 



