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CROSS-STRATIFICATION [6 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2020-10-05

English

Subject field(s)
  • Geomorphology and Geomorphogeny
  • Oceanography
  • Hydrology and Hydrography
CONT

Bedforms are structures that are moulded on beds where deposition is taking place. Current-produced bedforms are diverse, and are useful indicators of depositional processes. Most bedforms migrate over the sediment surface. As a result, sediments deposited by bedforms typically show cross-stratification.

CONT

There are three basic classes of "classic," unidirectional bedforms: ripples, dunes and antidunes ... However, moving sediment can generate a variety of different forms depending on the characteristics of the material and its substrate, which ultimately effect transport and bed morphology.

Key term(s)
  • bed-form

French

Domaine(s)
  • Géomorphologie et géomorphogénie
  • Océanographie
  • Hydrologie et hydrographie

Spanish

Save record 1

Record 2 2016-02-25

English

Subject field(s)
  • Petrography
  • Geology
DEF

Apparent layering in some igneous rocks caused by structural features, esp. horizontal jointing, that have the appearance of stratification.

OBS

false stratification : An old term for cross-stratification... used by Lyell... The term is rarely used today.

French

Domaine(s)
  • Pétrographie
  • Géologie
CONT

Certains ensembles ignés présentent une «pseudo-stratification». S'il s'agit d'ensembles volcaniques on peut souvent y distinguer des coulées successives, de compositions différentes, dans lesquelles on peut établir une véritable stratigraphie; souvent alors la minéralisation se localise à un certain niveau.

Spanish

Save record 2

Record 3 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

Save record 3

Record 4 2010-06-10

English

Subject field(s)
  • Geomorphology and Geomorphogeny
  • Erosion and Weathering (Geol.)
CONT

In the sandstones, flat lamination and low-angle cross-stratification predominate and there are abundant wave-rippled surfaces, these are interpreted as shoreface and inner-shelf deposits.

OBS

wave-rippled: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Géomorphologie et géomorphogénie
  • Érosion et corrosion (Géologie)
CONT

Les débris glaciels de l'estran, enfouis dans le matériel argilo-limoneux à rides de plage en surface, lors de l'installation du gel automnal à la marée basse, sont ainsi retroussés.

OBS

à rides de plage : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 4

Record 5 2009-06-22

English

Subject field(s)
  • Geomorphology and Geomorphogeny
DEF

Cross stratification dominated by concave-up strata deposited in swales...

CONT

Depending mainly on the relative importance of bed-form shifting vs. rate of aggradation, sets may be very restricted in lateral extent and show mainly concave-up laminae(most workers would probably call this swaly cross stratification), or they may be continuous over a greater lateral distance and show more convex-up laminae.

CONT

... the presence of occasional swaly cross-stratification suggests deposition above storm wave base, and pebbles again indicate the offshore transport of coarser foreshore sediment during storms.

OBS

[This is] similar to hummocky cross stratification, which is dominated by concave-up strata.

OBS

swaly bedding: term used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • swaly crossbedding

French

Domaine(s)
  • Géomorphologie et géomorphogénie
CONT

La partie supérieure [du lithofaciès de Sindou] est franchement grossière et comporte de nombreuses stratifications obliques en gouttières à feuillets soulignés par des galets millimétriques à centimétriques de quartz et disposés en «graded-beding».

CONT

D'une épaisseur maximale à l'affleurement d'environ 150 m, le membre Wa est représenté par des conglomérats, des brèches, des grès moyens à grossiers à litages obliques plans ou en auges avec des blocs de quartzites, à rares galets d'argilites et de gneiss et granitoïdes provenant du démantèlement d'anciens reliefs panafricains avoisinants [...]

OBS

stratification oblique en gouttière : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Key term(s)
  • litage oblique en gouttières
  • stratification oblique en auges
  • litage oblique en cuillère
  • stratification oblique en cuillères

Spanish

Save record 5

Record 6 1999-02-09

English

Subject field(s)
  • Geology
OBS

The bedding plane expression of micro cross-stratification.

Key term(s)
  • rib and furrow
  • rib-and-furrow structure

French

Domaine(s)
  • Géologie
OBS

Microstratification croisée vue dans le plan de stratification.

Spanish

Save record 6

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