Terminal Moraine


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Related to Terminal Moraine: Lateral moraine

terminal moraine

[′tər·mən·əl mə′rān]
(geology)
An end moraine that extends as an arcuate or crescentic ridge across a glacial valley; marks the farthest advance of a glacier. Also known as marginal moraine.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Terminal Moraine

 

(also frontal moraine), fragmental material deposited in the form of one or several arched ridges at the lower end of a valley glacier when the glacier was in a stationary position for a long period of time. It includes material from lateral moraines and ground, medial, and internal moraines. Depressions dividing individual ridges of the terminal moraine are frequently occupied by lakes. The outer ridge generally rises several dozen meters over the valley floor.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Wisconsin Glacier was ploughing logs into the terminal moraine in Miami lobe as far back as about 19,500 yr ago (W-304 Westchester and W-724 or W-738 Hamilton) whereas the ice of Scioto lobe emplaced logs in end moraine 18,100 yr ago (Y-448 Cuba, W-91 Chillicothe, W-331 Anderson).
Elias Mountains, based on tree-ring dating of white spruce, Picea glauca (Moench) Voss, that were killed during construction of the outermost terminal moraine.
Amid the fallout and the sleazy terminal moraine of judging, I remember being able to tell some of the truth on The McLaughlin Group.
Comparison of the photos indicates that there has been no appreciable advance or retreat during the 28-year span, as the terminal moraine appears to have remained practically unchanged.
They learn about the tundra, about terminal moraines, and eskars (underground rivers that form terminal moraine-like structures), about flora and fauna, about the Athabascan people who hunt and gather there, about poachers and the history of the area.
Magnificently showcasing the effects of continental glaciation (in some places the flow of glacial ice was as much as two miles deep) created a variety of geologic features including kames, kettles, drumlins, ice-walled-lake plans, eskers, tunnel channels, basalt bluffs, dells, and rock-strewn terminal moraines. Of special note is the ancient landscape of the Driftless Area which is devoid of glacial evidence.
Basically the position of the ice dam is recognized from two observations: the presence of one or more major terminal moraines deposited when there was a hiatus during the period of ice recession, and the disappearance (or weakening) of beaches as the ice barrier is approached (so that beaches are found only on the sides of the basin where the ice barrier was absent).