88 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 162. 
750 Tarr (R. S.). The physical geography of New York State. 
Am. Geog. Soc, Bull., vol. xxviii, pp. 102-129, 3 maps, 1896; vol. xxix, 
pp. 16-40, 19 figs, 1897 ; Review by W. M. Davis, Science, new ser., vol. 
vii, pp. 124-125 (£ p ), 1898. 
Describes the general physiographic and drainage features and geo- 
logic development of the State. 
757 The physical geography of New York State. 
Am. Geog. Soc, Bull., vol. xxx, pp. 28-56, 20 figs., pp. 183-225, 30 figs., 
pp. 375-407, 19 figs., 1898. 
Describes the plains and plateaus and the influence of the Glacial 
period upou the topography and drainage systems of the State. 
758 Tatham (William). Gold mining in Georgia. 
Franklin Inst., Jour., vol. cxlvi, pp. 19-26, 1898. 
Describes the occurrence of gold in central Georgia. 
759 Taylor (Frank Bursley). The Champlain submergence and uplift 
and their relations to the Great Lakes and Niagara Falls. 
Brit. Assoc. Adv. Soi., Kept. 1897, pp. 652-653, 1898. 
Discusses the evidences of the abandoned beaches. 
760 — : — Origin of the gorge of the whirlpool rapids at Niagara. 
Geol. Soc. Am., Bull., vol, ix, pp. 59-84, figs. 1-2; Review by W. M. 
Davis, Science, new ser., vol. vii, p. 627 (ip.)> 1898. 
Describes the character of the gorges and discusses the various inter- 
pretations of the phenomena and of their correlation. 
761 Some features of the recent geology around Detroit [Michigan]. 
Abstract, Am. Assoc. Adv. ScL, Proc, vol. xlvi, pp. 201-202, 1898. 
Discusses drainage features of the region. 
762 Notes on the moraines of the Georgian Bay lobe of the ice- 
sheet. 
Abstract, Science, new ser., vol. vii, p. 51 (§- p.), 1898. 
763 Teall (J. J. H). Differentiation in igneous magmas as a result of 
progressive crystallization. 
Brit. Assoc. Adv. ScL, Kept. 1897, pp. 661-662, 1898. 
Describes certain basalts and their bearing on the theory of differen- 
tiation of igneous magmas. 
764 Thompson (A. H.). Robert Hay. 
Kan. Acad. Sci., Trans., vol. xv, pp. 131-134, 1898. 
Gives a sketch of his life and character and a list of his publications. 
765 Tight (William G.). The development of the Ohio River. 
Abstracts, Science, new ser., vol. viii, pp. 465-466 (^ p.); Am. Geol., 
vol. xxii, p. 252 (£ p.), 1898. 
766 Tilton (J. L.) and Bain (H. F.). Geology of Madison County 
[Iowa]. 
Iowa Geol. Surv., vol. vii, pp. 491-539, pis. x-xi, figs. 72-79, with geo- 
logic map, 1897. ~ 
Describes the physiographic features, the occurrence and character 
of the Carboniferous and Pleistocene formations, and the occurrence of 
building stone, road material, and eoal. 
