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FALSE-BEDDING [1 record]

Record 1 2011-10-12

English

Subject field(s)
  • Geology
DEF

Lamination, in sedimentary rocks, confined to single beds and inclined to the general stratification.

OBS

[This phenomenon is] caused by swift local currents, deltas, or swirling wind gusts, and especially characteristic of sandstones, both aqueous and eolian.

OBS

Many authors have used "cross-bedding" and "cross-lamination" as synonymous with "cross-stratification," but it is proposed to restrict the terms cross-bedding and cross-lamination to a quantitative meaning depending on the thickness of the individual layers, or cross-strata. [Cross-stratification is considered to have two subdivisions: cross-bedding, in which the cross-strata are thicker than 1 cm, and cross-lamination, in which they are thinner than 1 cm.]

Key term(s)
  • cross bedding
  • false-bedding

French

Domaine(s)
  • Géologie
CONT

Mais les courants présentent des sinuosités avec le temps, sur une même verticale, les directions successives changent un peu. De sorte que sur une coupe oblique ou transversale à la direction dominante, on voit, dans les couches successives, les lits inclinés tantôt vers la droite, tantôt vers la gauche : c'est la «stratification entrecroisée».

CONT

Des structures sédimentaires avec laminations et stratifications entrecroisées, indiquent que le minerai s'est déposé selon un processus mécanique.

CONT

[...] les sédiments minéralisés présentent des stratifications entrecroisées [...]

CONT

Les stratifications obliques ou entrecroisées fournissent des indications sur : les relations géométriques entre les minéralisations et les structures sédimentaires de dynamisme [...]; les directions de paléocourants [...] le type de milieu [...]

Spanish

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