Virgation of Folds

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Virgation of Folds

 

in geology, the fan-shaped branching of a bunch of fissionable folds of rock accompanied by the gradual accumulation of fold joints. Virgations are usually observed in places at the end of folded structures. For example, the Northern Tien-Shan at its western edge has a fan of folds forming the Chu-Iliiskii, Karatau, and Chatkal’skii ranges, and the Gissar-Alai ends on the west with the fanlike branching folds of the Nuratau Range and the ranges of the Tadzhik depression and the Darvaza.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.