94 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 135. 
571 Upham (Warren). Wave-like progress of an epeirogenic uplift. 
Jour, of Geol., vol. ii, pp. 383-395. 
Discusses the evidences of an epeirogenic movement in the northern 
two-thirds of North America in late Tertiary and Quaternary times. 
572 Marine shell fragments in drumlins near Boston [Mass.]. 
Am. Jour. Sci., 3d ser., vol. xlvii, pp. 238-239 (communicated). 
Mentions fossils found in drumlins near Boston and considers them 
pre-Glacial. 
573 Diversity of the glacial drift along its boundary. 
Am. Jour. Sci., 3d ser., vol. xlvii, pp. 358-365. 
Abstract: Am. Geol., vol. xiii, p. 223 (f p.). 
Describes the early and later drift of the Mississippi Valley, and 
discusses the oscillations of the boundary of the ice sheet during its 
general recession. 
574 British drift theories. 
Am. Geol., vol. xiii, pp. 275-279. 
Reviews the theories advanced by certain English writers to explain 
the formation of drift deposits. 
575 Causes and conditions of glaciation. 
Am. Geol., vol. xiv, pp. 12-20. 
Reviews the recent literature on the origin and duration of the 
Glacial period, and remarks on the evidences of great erosion of the 
Lafayette formation in the United States in early Quaternary time. 
576 The Niagara gorge as a measure of the post-Glacial period. 
Am. Geol., vol. xiv, pp. 62-64 (correspondence). 
Reviews the evidences indicating the extent of the glacial Lakes 
Warren and Algonquin and their bearing on the probable volume of 
the Niagara River. 
577 The Madison type of drumlins. 
Am. Geol., vol. xiv, pp. 69-83, with map, pi. iii, figs. 4-7. 
Abstract: Am. Geol., vol. xiii, pp. 222-223 (9 1.). 
Describes drumlins with nucleal stratified sand in Massachusetts, 
and gives a more detailed description of similar drumlins in the vicin- 
ity of Madson, Wis. 
578 Tertiary and early Quaternary baseleveling in Minnesota, 
Manitoba, and northwestward. 
Am. Geol., vol. xiv, pp. 235-246. 
Abstracts: Jour, of Geol., vol. ii, p. 754 (£ p.); Am. Geol., vol. xiv, 
p. 199 (i p.) 
Describes the Tertiary and Quaternary baseleveling and the result- 
ant topographic forms in this region. Discusses the evidence of the 
direction of the drainage during this period and the relationship of 
the later baseleveling to the Ice age. 
579 Evidence of superglacial eskers in Illinois and northward. 
Am. Geol., vol. xiv, pp. 403-405 (correspondence). 
Discusses certain glacial phenomena in Illinois and Minnesota. 
