A complex, friable, deltaic sediment accumulated at the foot of a slope as a result of an occasional torrential washing of fragmental material.
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 It might be outdated or ideologically biased.



loose formations that are the products of rock fragmentation and that are carried by streams of water to the foot of highlands. Proluvium forms alluvial fans and, where they merge, proluvial trains. The texture of the detrital material changes from pebbles and gravel with fanglomerates at the top of the fan to finer, more highly sorted sediments, frequently loesslike loams and sandy loams (proluvial loesses), at the bottom.

Proluvium is most fully developed in the foothills of arid and semiarid regions where aleurite-clay sediments (frequently gypsumed and salinized) from flash floods sometimes form on the periphery of the area of proluvium distribution.

The term “proluvium” was proposed by the Russian geologist A. P. Pavlov for deposits, represented by loam-clay loesslike material, from ephemeral mountain streams.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The zonal soils are Calci-Orthic Aridisols, which are derived from proluvium and alluvium, according to Chinese Soil Taxonomy (Cooperative Research Group on Chinese Soil Taxonomy 2001).