Colluvia | Article about colluvia by The Free Dictionary
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Loose, incoherent deposits at the foot of a slope or cliff, brought there principally by gravity.
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 It might be outdated or ideologically biased.
fragmental material accumulating on mountain slopes or at the foot of slopes owing to displacement from higher areas by gravity (talus, creep, and slides) or the movement of thawing, water-saturated products of weathering in areas of permafrost.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive
The lowest deposits (e) consist of poorly sorted sand and silt colluvia (Mz = 2.1-2.6; [[sigma].sub.1] = 1.3-1.45 phi) with an organic matter content of 5-7% and a thickness of up to 0.85 m.
The valleys have similarly well-formed shallow series of slope sediments in the form of sandy colluvia. The floor part of it may originate from the late Vistulian and Holocene, the period when the succession of forests (Ralska-Jasiewiczowa 1999) could not keep up with fast climate changes, and thus the material could have been washed out of the slopes of the already developed valleys (Larsen et al.
The redistribution of carbonates within the landscape is a frequent process in slopes covered by rockfalls or calcareous colluvia
. Subsurface runoff is responsible for the transport of these carbonates in the lower, more stable, parts of the slopes, where they accumulate.
This is in agreement with the alternation of pedogenic substrates: horizon Ck corresponds to loess, IICk corresponds to marl colluvia
and IIICk corresponds to loess.
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