downfoldn.

Brit.

/ˈdaʊnfəʊld/, U.S.

/ˈdaʊnˌfoʊld/

Origin: Formed within English, by derivation. Etymons: down- prefix, fold n.³

Etymology: < down- prefix + fold n.³ Compare earlier downfolded adj.

Geology.

A basin or trough-shaped fold (fold n.³ 1h) whose upper component strata are younger than those below; a syncline. Also: the process of deforming strata to produce such a fold. Cf. upfold n.

ΚΠ

1866 Proc. Boston Soc. Nat. Hist. 10 280 When the upfold of the continental elevations, and the downfold of the sea beds had begun.

1875 Proc. Boston Soc. Nat. Hist. 17 489 If I am right in regarding these depressions as great faulted down-folds, they had a magnitude of dislocation quite commeasurable with the greatest of Appalachian folds.

1920 Glasgow Herald 15 Oct. 7 The oil did not come from the arches or anticlines, but from the down folds (synclines).

1954 J. F. Kirkaldy Gen. Princ. Geol. ii. 25 Stratified rocks..are often seen to be folded into upfolds (anticlines) and downfolds (synclines).

2012 D. Ford in W. B. White & D. C. Culver Encyl. Caves (ed. 2) 89/2 South of the cave and parallel to it there is a sharp downfold in the Cathedral rocks.

This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022).

单词	downfold
释义	downfoldn. Brit. /ˈdaʊnfəʊld/, U.S. /ˈdaʊnˌfoʊld/ Origin: Formed within English, by derivation. Etymons: down- prefix, fold n.³ Etymology: < down- prefix + fold n.³ Compare earlier downfolded adj. Geology. A basin or trough-shaped fold (fold n.³ 1h) whose upper component strata are younger than those below; a syncline. Also: the process of deforming strata to produce such a fold. Cf. upfold n. ΚΠ 1866 Proc. Boston Soc. Nat. Hist. 10 280 When the upfold of the continental elevations, and the downfold of the sea beds had begun. 1875 Proc. Boston Soc. Nat. Hist. 17 489 If I am right in regarding these depressions as great faulted down-folds, they had a magnitude of dislocation quite commeasurable with the greatest of Appalachian folds. 1920 Glasgow Herald 15 Oct. 7 The oil did not come from the arches or anticlines, but from the down folds (synclines). 1954 J. F. Kirkaldy Gen. Princ. Geol. ii. 25 Stratified rocks..are often seen to be folded into upfolds (anticlines) and downfolds (synclines). 2012 D. Ford in W. B. White & D. C. Culver Encyl. Caves (ed. 2) 89/2 South of the cave and parallel to it there is a sharp downfold in the Cathedral rocks. This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022). < n.1866
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