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CROSS-BEDDING [17 records]

Record 1 2013-04-29

English

Subject field(s)
  • Climatology
  • Paleontology
DEF

An ancient wind, existing in the geologic past, the direction of which can be inferred from patterns of ancient ash falls, orientation of cross-bedding, and growth rates of colonial corals.

French

Domaine(s)
  • Climatologie
  • Paléontologie

Spanish

Save record 1

Record 2 2012-03-02

English

Subject field(s)
  • Geology
DEF

Cross-bedding in which the foreset beds are "overturned or buckled in the downcurrent direction usually prior to deposition of the overlying bed"...

French

Domaine(s)
  • Géologie
DEF

Stratification entrecroisée dans laquelle les couches frontales sont repliées vers l'aval, généralement avant le dépôt de la couche sus-jacente.

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 2011-08-19

English

Subject field(s)
  • Tectonics
DEF

A cross-bedding that dips in opposite directions in alternating beds forming a chevron pattern.

CONT

Quartz arenites with bimodal (herringbone) crossbedding.

OBS

chevron cross-bedding; herringbone cross-bedding : terms used at Natural Resources Canada-Earth Sciences Sector.

French

Domaine(s)
  • Tectonique
DEF

Stratification dont le pendage varie d'une couche à l'autre pour former des chevrons.

CONT

Quartzarénites à strates obliques bimodales (en chevrons).

OBS

stratification entrecroisée en chevrons; stratification oblique en chevrons; stratification entrecroisée en arêtes de poisson; stratification oblique en arêtes de hareng : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 4

Record 5 2011-08-19

English

Subject field(s)
  • Geology
DEF

A crossbedding in which the lower bounding surface has a planar surface of erosion.

CONT

Planar cross-bedding.-Laminations and bedding [are] strongly inclined(10°-35°) to the principal surface of sedimentation following correction for structural dip.

OBS

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

Key term(s)
  • planar cross stratification

French

Domaine(s)
  • Géologie
DEF

Stratification oblique caractérisée par des couches frontales planes.

OBS

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

Spanish

Save record 5

Record 6 2011-08-01

English

Subject field(s)
  • Geology
DEF

Cross-bedding deposited on a concave surface or cross-bedding with concave, tangential, foreset beds.

French

Domaine(s)
  • Géologie

Spanish

Save record 6

Record 7 2011-08-01

English

Subject field(s)
  • Tectonics
DEF

A crossbedding in which the cross-bedded units are bounded by a flat base and flat top forming a tabular body.

OBS

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

French

Domaine(s)
  • Tectonique
CONT

Stratification entrecroisée tabulaire. [...] La forme la plus répandue de stratification entrecroisée est la forme tabulaire; le banc présentant des lits obliques est limité dessus et dessous par un litage horizontal.

OBS

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

Spanish

Save record 7

Record 8 2011-08-01

English

Subject field(s)
  • Geology
  • Petrography
DEF

Cross-bedding in which beds meet the underlying surface at high, sharp angles.

French

Domaine(s)
  • Géologie
  • Pétrographie

Spanish

Save record 8

Record 9 2011-08-01

English

Subject field(s)
  • Geology
DEF

A variety of trough cross-bedding which consists of elongate, semi-ellipsoidal, plunging troughs that are filled by series of laminae conforming to the shapes of the troughs.

French

Domaine(s)
  • Géologie
DEF

Ensemble de laminas qui remplissent, en en suivant les contours, des auges d'érosion allongées et de section semi-elliptique.

Spanish

Save record 9

Record 10 2010-12-03

English

Subject field(s)
  • Geology
DEF

Cross-bedding in which the lower surfaces are curved erosional contacts which result from scour and subsequent deposition.

OBS

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

Key term(s)
  • crescent-type cross-bedding
  • crescent-type crossbedding
  • crescent-type cross bedding

French

Domaine(s)
  • Géologie
OBS

stratification oblique en auge; stratification croisée en auge : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

PHR

Grès à litage oblique en auge.

Spanish

Save record 10

Record 11 2009-05-07

English

Subject field(s)
  • Geomorphology and Geomorphogeny
  • Hydrology and Hydrography
DEF

One of a series of inclined symmetrically arranged layers of a cross-bedding unit formed by deposition of sediments that rolled down a steep frontal slope of a delta or dune.

OBS

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

French

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

Au front [du delta] lui-même, les couches sont inclinées : lits frontaux («foreset-beds») qui avancent peu à peu et recouvrent au fur et à mesure les couches de fond.

CONT

Dans un delta, la déposition des matériaux s'organise selon une stratification particulière: des lits sommitaux, des lits frontaux et des lits de fond.

OBS

couche frontale; couche de front : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 11

Record 12 2009-03-19

English

Subject field(s)
  • Geomorphology and Geomorphogeny
  • Hydrology and Hydrography
OBS

foreset bed : One of a series of inclined symmetrically arranged layers of a cross-bedding unit formed by deposition of sediments that rolled down a steep frontal slope of a delta or dune.

OBS

concave foreset: term used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • concave fore-set bed
  • concave fore-set

French

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

Couche oblique concave déposée à l'aval du courant.

OBS

couche frontale concave : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 12

Record 13 2008-08-25

English

Subject field(s)
  • Petrography
DEF

A marine sedimentary facies characterized by a thick sequence of poorly fossiliferous, thinly bedded, graded deposits composed chiefly of marls and sandy and calcareous shales and muds, rhythmically interbedded with conglomerates, coarse sandstones, and graywackes.

CONT

... there are two major facies of sediments associated with geosynclines or mobile belts. These are the "flysch" and the "molasse" facies.... The flysch facies is marked by its great thickness and its predominantly argillaceous nature. It is almost wholly clastic, although at some stages bedded cherts or radiolarites were deposited.... The bedding is well marked, uniform, and rhythmic... The principal material is shale or silty shale regularly interbedded with graded beds of dark sandstone(usually graywackes) varying from a few centimeters to a meter or two in thickness.... Graded bedding is the rule; large-scale cross-bedding is absent, although ripple bedding may be present.... Noteworthy is the absence of carbonates, except as concretions in siltstone beds.

CONT

The flysch-like facies consists of greywacke-mudstone with locally abundant conglomerate and iron-formation ...

OBS

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

Key term(s)
  • flyschlike facies

French

Domaine(s)
  • Pétrographie
DEF

[...] formation de faciès particulier qui peut avoir pris naissance à différentes époques géologiques [et qui] elle est constituée par une alternance [...] de bancs de grès, de sables, de conglomérats, de schistes argileux ou marneux et, plus rarement, de calcaires.

CONT

Des cordillères surgissent, alimentant les bras de mer en matériel de plus en plus grossier. C'est ainsi que le faciès «flysch» s'installe d'abord dans les parties internes, puis vers l'extérieur, ainsi que le montrent les séries orogéniques des diverses unités préalpines et helvétiques dans les Alpes françaises, suisses, bavaroises et autrichiennes.

CONT

Le flysch constitue donc une formation marine essentiellement détritique qui semble s'être déposée, sous l'effet de courants de turbidité, à une profondeur moyenne [...] susceptible de variations dans le temps et dans l'espace.

CONT

Pendant longtemps, le flysch a représenté un dépôt rythmique, très épais [...], très étendu et formé d'une alternance de grès et de schistes ou marnes [...] il y a une prédominance constante de carbonate, dont le taux varie de 30 à 90 p. cent [...] du moins pour les bassins récents [...]

OBS

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

Spanish

Campo(s) temático(s)
  • Petrografía
Save record 13

Record 14 2008-06-16

English

Subject field(s)
  • Tectonics
CONT

The Guará Formation(Upper Jurassic) displays a well-defined facies shift along its outcrop belt. On its northern portion it is characterised by coarse-grained to conglomeratic sandstones with trough and planar cross-bedding, as well as low-angle lamination, which are interpreted to represent braided river deposits.

OBS

low-angle lamination: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Tectonique
CONT

Grainstone oolithique à laminations planes ou à angle faible.

OBS

lamination à angle faible : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 14

Record 15 1999-03-19

English

Subject field(s)
  • Geology
DEF

Small scale cross-bedding related to ripple-mark migration; asymmetrical with more pronounced lee-side accumulation than in unilateral rolling strata...

French

Domaine(s)
  • Géologie
DEF

Stratification croisée de petite taille, liée à la migration de rides [...]

Spanish

Save record 15

Record 16 1999-02-09

English

Subject field(s)
  • Geology
DEF

Cross-bedding whose outline, in vertical section, is lenslike.

Key term(s)
  • lenslike cross-bedding
  • lenticular crossbedding
  • lenslike crossbedding

French

Domaine(s)
  • Géologie
DEF

Ensemble à stratification croisée dont le contour, en coupe verticale, a l'aspect d'une lentille.

Spanish

Save record 16

Record 17 1998-10-14

English

Subject field(s)
  • Geomorphology and Geomorphogeny
DEF

Any sedimentary structure that indicates the direction of the current that produced it; e. g. cross-bedding, current marks, and ripple marks.

French

Domaine(s)
  • Géomorphologie et géomorphogénie
DEF

[...] structure parallèle ou presque à la direction générale des couches.

OBS

Terme utilisé en particulier pour les failles ou les filons.

Spanish

Save record 17

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