Geology (1907) (14589842730) - Public domain book illustration

Identifier: geology00cham (find matches)
Title: Geology
Year: 1907 (1900s)
Authors: Chamberlin, Thomas C. (Thomas Chrowder), 1843-1928 Salisbury, Rollin D., 1859- joint author
Subjects: Geology
Publisher: New York, H. Holt and co.
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive



Text Appearing Before Image:
Fig. 523.—A section of loess in Iowa, showing its ability to stand with vertical or even overhanging faces. (Calvin.)
Text Appearing After Image:
Fig. 524.—A section of the loess at Kansas City, showing its rude columnar structure. (Mo. Geol. Surv.) THE PLEISTOCENE OR GLACIAL PERIOD 407 the borders of the drift in some directions, in both continents, and inAmerica it occurs in the driftless area (Fig. 470). In Turkestan, Mon-golia, and China,1 where loess has its greatest known development, itis not known to be immediately associated with glacial formations,though its age is probably about the same as that of the chief depositsin Europe and America. In North America, the loess does not occur east of the Mississippibasin, and has no great development east of the Wabash river. Thegreatest development is in Illinois, Iowa, Nebraska, and the Stateslying south of them, even beyond the reach of the most extensive ice-sheet. Within this area, its distribution is peculiar in that (1) it isthick about the border of the area occupied b)^ the Iowan ice-sheet;(2) it thins out on the inter-stream areas as it is traced away fromthis border