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Related to syncline: plunging fold
a downward fold of stratified rock in which the strata slope towards a vertical axis
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a fold of stratified rock that is convex downward. Younger rocks occur in a syncline’s core rather than on its limbs. Synclines alternate with anticlines— folds of rock strata that are convex upward.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
A fold having stratigraphically younger rock material in its core; it is concave upward.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.