chevron fold

chevron fold

[′shev·rən ‚fōld]
(geology)
An accordionlike fold with limbs of equal length.
References in periodicals archive ?
In his seminal study of chevron fold mechanisms in regional deformation, Ramsay (1974) identified a limit to purely flexural-slip (layer-parallel slip) defined by interlimb angle.
Post-[F.sub.2] structures include a sparsely developed set of chevron folds with horizontal axial planes ([F.sub.3]) and a poorly developed axial planar slaty cleavage ([S.sub.3]).
In this structural transect, chevron folds commonly tighten through the critical angle without local refolding or development of a second cleavage according to the Ramsay (1974) model (though two isolated examples of [F.sub.3] folds near Deerwood Drive may be of this nature).