76 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 146. 
488 Upham (Warren). Epochs and stages of the Glacial period. 
Am. Jour. Sci., 3d ser., vol. xlix, pp. 305-306. 
States briefly the reasons for considering that Pleistocene glaciation 
was continuous, with fluctuations of the ice margin much greater in the 
interior than eastward. Presents a table showing the minor time sub- 
divisions of the Glacial and Champlain epochs. 
489 Drumlm accumulation. 
Am. Geol. 7 Vol. xv, pp. 194-195 (correspondence). 
Describes the general features of drumlins as shown by recent de- 
scriptions of the glacial phenomena of Greenland. 
490 Climatic conditions shown by North American inter-Glacial 
deposits. 
Am. Geol., vol. xv, pp. 273-295. 
Describes the fluctuations of the borders of the ice sheet, and the 
character of the inter-Glacial deposits in Minnesota, Iowa, Illinois, Indi- 
ana, Ohio, New England, and portions of Canada. Mentions many of 
the fossils found in these inter-Glacial beds. Presents a map showing 
the maximum area of the ice sheet and the stages of its recession, and a 
table showing the epochs and stages of the Glacial period. 
491 Stages of recession of the North American ice sheet, shown 
by glacial lakes. 
Am. Geol., vol. xv, pp. 396-399 (correspondence). 
Gives the sequence of events of the recession of the ice sheet repre- 
sented by seven stages of waning glaciation, and discusses the evidence 
attributiug the Pleistocene shore lines to lakes dammed on the north by 
the receding ice sheet. 
492 Correlations of stages of the Ice age in North America and 
Europe. 
Am. Geol., vol. xvi, pp. 100-113, pis. v-vi. 
Presents a map of the glaciated region of North America and one of 
the glaciated area of Europe. Describes the different stages into which 
the author divides the Glacial and Champlain epochs. Discusses the 
evidences of the character, formation, and accumulation of marginal 
moraines, and compares the Alaskan ice sheet Avith that of Greenland. 
493 Warm, temperate vegetation near glaciers. 
Am. Geol., vol. xvi, i>p. 326-327 (correspondence). 
States the author's opinions as to the existence of a warm, temperate 
vegetation near the glacial ice sheet. 
494 Yiew of the Ice age as two epochs, the Glacial and Champlain. 
Science, new ser., vol. ii, pp. 529-533. 
Discusses the nomenclature of the epochs and stages of the Glacial 
epoch, and describes their character and extent in North America. 
495 Tertiary and early Quaternary baseleveling in Minnesota, 
Manitoba, and northwestward. 
Abstract : Geol. Soc. Am., Bull., vol. vi, pp. 17-20. 
See Bibliography and Index for 1894, No. 578. 
