What is Chevron (geology)?
[[Image:Millook cliffs enh.jpg|right|thumb|300px| Chevron folds with flat-lying axial planes, [[Millook|Millook Haven]], North [[Cornwall]]]] [[File:Chevron Crevasses 00.JPG|right|thumb|300px|Chevron crevasses on a [[glacier]]]] A '''chevron''' in [[geology]] is a sharply-folded [[rock formation]]. Chevron folds are regular folded beds with straight limbs and sharp hinges. Well developed, these folds produce a set of v-shaped beds.<ref name=Ramsay>{{cite journal|last=Ramsay|first=J|title=Development of chevron folds|url=https://archive.org/details/sim_geological-society-of-america-bulletin_1974-11_85_11/page/1741|journal=Geological Society of America Bulletin|date=1974|volume=85|issue=11|page=1741|doi=10.1130/0016-7606(1974)85<1741:docf>2.0.co;2 }}</ref> They develop in response to [[compression (physical)|compressive]] [[Stress (mechanics)|stress]]. The angles of the [[fold (geology)|folds]] are generally 60 degrees or less. Chevron folding is helped if the bedding alternates between beds of different make-up.<ref name=Ramsay/> Turbidites,<ref>Deposits in the deep ocean from gravity flow of sediments.</ref> with alternating [[sandstone|sandstones]] and [[shale|shales]], are the typical geological setting for chevron folds to occurs.<ref name=Reches>{{cite journal|last=Reches|first=Z E|author2=Johnson|title=A theory of concentric, kink and sinusoidal folding and of monoclinal flexuring of compressible, elastic multilayers: VI. Asymmetric folding and monoclinal kinking|journal=[[Tectonophysics (journal)|Tectonophysics]]|date=1976|volume=35|issue=4|pages=295–334|doi=10.1016/0040-1951(76)90074-3}}</ref> Chevrons can also form in land deposits, especially where there are [[sand dune]]s. == References == {{reflist}} [[Category:Landforms]]