weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1896. 79 
610 Shaler (X. S.). The share of volcanic dust and pumice in marine 
deposits. 
Abstract: Geol. Soc. Am., Bull., vol. vii, pp. 490-492, 1896. 
Discusses the amount ami distribution of these materials in marine 
deposits. 
611 The economic aspect of soil erosion. 
Nat, Geog. Mag., vol. vii, pp. 328-338, 1896. 
Describes the process of erosion. 
612 Woodworth (J. B.), and Marbut (C. F.). The Glacial brick 
clays of Rhode Island and southeastern Massachusetts. 
U. S. Geol. Surv., 17th Ann. Rept., Pt. I, pp. 957-1004, pis. lxi-lxii, 
figs. 34-43, 1896. 
Describes the origin and character of the clays, their geographical 
distribution, correlation, and the general features of the clays about 
Boston. 
613 Shattuck (George Burbank). Preliminary discussion of the geol- 
ogy of the Bordentown sheet [New Jersey] of the geologic 
atlas of the United States. 
Johns Hopkins Univ. Circ, vol. xv, pp. 14-15, 1895. 
Describes the character and distribution of the Pleistocene, Tertiary, 
and Cretaceous beds of the region. 
614 Shephard (James H.). The artesian waters of South Dakota. 
U. S. Exp. Stat., South Dakota, Bull. 41, 76 pp., 1894. 
Gives sections of the wells and chemical analyses of the waters. 
615 The shallow artesian wells of South Dakota. 
U. S. Exp. Stat,, South Dakota, Bull. No. 49, 24 pp., 1896. 
Describes the occurrence of artesian waters and gives chemical 
analyses. 
616 Sherborn (Charles Davies). An index to the genera and species 
of the Foraminifera. 
Smith. Inst., Miscl. Coll., No. 1031, Part II, non to z, 1896. 
617 Shimek (B.). A theory of the loess. 
Iowa Acad. Sci., Proc, vol. iii, pp. 82-89, 1896. 
Discusses the origin of the loess of the Mississippi Valley. 
618 Simonds (Frederic W.). Floating sand: an unusual mode of 
river transportation. 
Am. Geol., vol. xvii, pp. 29-37, 1896. 
Describes the phenomena of Moating sand on the Llano River in Texas 
and discusses its cause. 
619 Floating sand: an unusual mode of river transportation. 
Sci. Amer. Suppl., vol. xli, pp. 16745-16746, 1896. 
620 Simpson (Charles T.). Description of four new Triassic Unios 
from the Staked Plains of Texas. 
U. S. Nat. Mas., Proc., vol. xviii, pp. 381-385, 1896. 
