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IV.—Notes on the Surface Geology of a Part of the Mississippi Valley1

Published online by Cambridge University Press:  01 May 2009

W. J. McGee Esq., etc., etc.
W. J. McGee Esq., etc., etc.
Affiliation:
Farley, Iowa.
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Extract

Kames, åsar, and minor topographical features.—Kames and åsar are usually found associated. Indeed, the one class of elevations shades into the other so gradually that it is sometimes impossible to draw the line between them. Though the kames may occur singly, they are often in ranges of several, perhaps extending for miles. Each is usually elliptical in outline, and its longer axis corresponds in direction with the range. The åsar are frequently intercepted by channels of erosion, by which they are divided into ranges of oblong hills, the direction of which is very nearly the same as that of the kames proper. In Dubuque county, Iowa, where these features have been most thoroughly studied, this direction is about S. 75° E. Within 40 miles south-west from there the direction changes to abut S. 45° E., and in the next 50 miles the direction becomes a trifle west of south; and this is the general direction over the greater part of the region examined.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 9 , September 1879 , pp. 412 - 420
Copyright
Copyright © Cambridge University Press 1879

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References

page 413 note 1 “Great Ice Age,” chapters xvi. and xvii.

page 414 note 1 In the paper read before the American Association is a table of eighty-three sections in North-eastern Iowa.

page 414 note 2 Communicated, with the following, and with samples from different depths, by Dr. J. D. Moody.

page 417 note 1 Some references are given in the paper already mentioned, which tear upon this point.

page 418 note 1 “Ann. Eep. Nat. Hist. Surv. of Minn.,” 1878. See also Ann. Journ. Sci., Feb. 1879, p. 168.

page 418 note 2 Vide “Cataclysmic Theories of Geological Climate,” Croll in GEOL. MAG. for Sept. 1878.

page 418 note 3 “Heat as a Mode of Motion,” Amer. ed., par. 684.

page 419 note 1 “Relative Intensity of the Sun's Light and Heat,” Smithsonian Contributions to Knowledge, 1855, p. 35.

page 420 note 1 “Climate and Time,” Am. ed., pp. 377 and 388. For difference in amount o heat received by the two hemispheres, see ibid., table iv. p. 320.

page 420 note 2 The well-known fact that the productiveness of soils and the richness and variety of the flora they support, is directly proportional (other things being equal to the amount of humus in the soil), is strongly emphasized by the analyses given ii the annual report of the Wisconsin Geological Survey for 1878, which has just beei received.

page 420 note 3 “Report on the Transactions of the Geneva Society of Physics and Natura History,” by Dr. J. Müller, translated for “Smithsonian Report,” 1877, p. 221.

page 420 note 4 Resume for 1877 in Smith. Eep. 1877, p. 58.