File:Geology (1907) (14773354261).jpg

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
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Fig. 497.—Terminal moraine topography near Oconomowoc, Wis. (Fenneman.) does not lie in its importance as a topographic feature, but in the detailsof its own topography. Its surface is often characterized by hillocksand hollows, or by interrupted ridges and troughs, following one anotherin rapid succession, and without apparent order in their arrangement(Figs. 497 and 498). The hollows and troughs are often without out-lets, and are frequently marked by marshes, ponds, and lakes where-ever the material constituting their bottoms is sufficiently imperviousto retain the water falling and draining into them. The shape andabundance of round and roundish hills, and of short and more or lessserpentine ridges, often closely huddled together, have locally givenrise to such descriptive names as the knobs, short hills, etc. 364 GEOLOGY.
Text Appearing After Image:
a> - Ql o =)a> U C M 3 tn W W) o ^o £ •-3 c3 g » si.2«~s op ^^ *- C c3 3 > *t* be ^° ^tS o . * *%Ph ^-o, 2 ^ d c a; £ n tf o t-i D* *- 2o ^ ^ g 0 « o +■= -^> r n-l 03 C 05 _V - ■—1 S© ~-4 00 a> *r« g THE PLEISTOCENE OR GLACIAL PERIOD. 365 But it is the association of the knobs or short hills with the kettles, and not either feature alone, which is especially character-istic of terminal moraine topography. The knobs vary in size, from low mounds but a few feet across,to considerable hills half a mile or more in diameter, and a hundredfeet or more in height. If they attain such heights while their basesare small, their slopes are steep. Not rarely they are about as steepas the loose material of which they are composed will He. The kettles are the counterparts of the elevations. They maybe a few feet, or many rods, or even furlongs in diameter.

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