88 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 135. 
532 Spencer (Joseph W.). The duration of Niagara Falls. 
Am. Jour. Sci., 3d ser., vol. xlviii, pp. 455-472 
Abstracts : Am. Geol., vol. xiv, p. 204 (7 1.) ; Am. Nat., vol. xxviii, pp. 
859-862. 
Reviews the different opinions as to the age of the falls, describes 
the topography and geology of the region, and discusses the history of 
the Great Lakes and Niagara River, the age of the falls as shown by 
terrestrial movements, and the relationship of the falls to geologic 
time. Gives a summary of conclusions. 
533 The rock basin of Cayuga Lake |New York]. 
Am. Geol., vol. xiv, pp. 134-135 (correspondence). 
* Reviews the evidence indicating that Lake Cayuga occupies a rock 
basin. 
534 The age of Niagara Falls. 
Am. Geol., vol. xiv, pp. 135-136 (correspondence). 
Gives a brief statement of the results of the writer's studies in the 
region of the Great Lakes. 
535 A review of the history of the Great Lakes. 
Am. Geol., vol. xiv, pp. 289-301, pi. viii. 
Discusses the evidence of a former high continental elevation and 
describes the character of the lake basin, the drainage of the region, 
the formation of the modern lakes, the history of the Niagara River, 
and the changes of the outlets of the lakes. 
53G Terrestrial submergence southeast of the American Conti- 
nent. 
Abstracts: Geol. Soc. Am., Bull., vol.*v, pp. 19-21; Am. Geol., vol. 
xii, p. 168 (f p.); Am. Nat., vol. xxviii, p. 51 (§• p.). 
Discusses the evidences of a submergence in this region. 
537 Niagara Falls as a chronometer of geological time. 
Abstract: Roy. Soc. of London, Proc, vol. 1, pp. 145-148. 
Communicated by Prof. T. G. Bonney. 
538 The Yumuri Valley of Cuba. 
Geol. Mag., dec iv, vol. i, pp. 499-502. 
Describes the formation of the valley in Pleistocene time. 
538a The Paleozoic group : The geology of ten counties of north- 
western Georgia and resources. 
Abstract: Am. Jour. Sci., 3d ser., vol. xlvii, p. 78 (£ p.). 
Review: Jour, of Geol., vol. ii, pp. 335-339, by E. A. Smith. 
Noticed in Bibliography and Index for 1892 and 1893. 
538/> The drainage of the Great Lakes in the Mississippi by way 
of Chicago. 
Abstract: Am. Nat., vol. xxviii, p. 884 (| p.), by the author. 
538c The restoration of the Antillean Continent. 
Abstract: Am. Nat., vol. xxviii, pp. 881-884, by the author. 
