weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898. 89 
767 Todd (James E.). A revision of the moraines of Minnesota. 
Am. Jour. Sci., 4th ser., vol. vi, pp. 469-477, with map, 1898. 
Reviews the work of Warren Upnam on the glacial features of Min- 
nesota. 
7G8 Degradation of the loess. 
Iowa Acad. Sci., Proc, vol. v, pp. 46-51, 1898. 
Discusses different theories of the origin of the loess, and describes 
the character and process of its degradation. 
709 Section along Rapid Creek from Eapid City westward [South 
Dakota]. 
S. D. Geol. Surv., Bull. No. 2, pp. 27-40, pis. ii-v, 1898. 
Describes the Algonkian, Cambrian, Carboniferous, Juratrias, and 
Cretaceous rocks of the section in the eastern part of the Black Hills. 
Includes brief notes on the economic products. 
770 A reconnaissance into northwestern South Dakota. 
S. D. Geol. Surv., Bull. No. 2, pp. 43-68, pis. i, v-x, 1898. 
Describes the physiographic features and the occurrence and charac- 
ter of the Cretaceous and Tertiary rocks of the region. Includes brief 
notes on the economic products. 
771 The geology along the Burlington and Missouri Railway 
f South Dakota]. 
S. D. Geol. Surv., Bull. No. 2, pp. 69-82, 1898. 
Includes general notes on the geology of the eastern portion of the 
Black Hills. 
772 Additional notes on the limits of the main artesian basin 
[South Dakota]. 
S. D. Geol. Surv., Bull. No. 2, pp. 88-115, pi. xi, 1898. 
Includes sections of well borings in various parts of the artesian 
basin. 
773 The exploration of the White Eiver bad lands in 1896 [South 
Dakota]. 
S. D. Geol. Surv., Bull. No. 2, pp, 117-135, pis. xii-xv, 1898. 
Describes the Cretaceous, Tertiary, and Pleistocene strata of the 
region and gives notes on the character of the economic products. 
774 The clay and stone resources of South Dakota. 
Eng. and Mg. Jour., vol. lxvi, p. 371 (£ p. ), 1898. 
Describes briefly the occurrence of clay and building stones. 
775 Is the loess of either lacustrine or semilacustrine origin? 
Science, new ser., vol. v, pp. 993-994, 1897. 
See Bibliography and Index for 1897, No. 611. 
776 Turner (Henry W.). Bidwell Bar folio, California. 
U. S. Geol. Surv., Geol. Atlas of the U. S., Folio No. 43; Review, Jour, 
of Geol., vol. vi, pp. 542-544, 1898. 
Describes the physiographic features and the character and occur- 
rence of the Paleozoic, Tertiary, and Pleistocene rocks and of the gold 
gravels and quartz veins. Includes a description of the gold belt of 
California and geologic and topographic maps. 
