Definitions for "CROSS-BEDDING"
Related Terms:
Graded bedding, Bed, Bedding plane, Bedding, Loess, Turbidite, Gravel, Aeolian deposits, Desert pavement, Sand, Tillite, Unconsolidated, Sedimentary, Detrital, Deposit, Varve, Arenaceous, Disconformity, Placer, Silt, Lithify, Sedimentary rocks, Boulder clay, Bedrock, Sedimentary rock, Placer deposit, Foliation, Clay, Conglomerate , Regolith, Colluvium, Sandy loam, Overburden, Shingle, Till, Cobble, Molasse, Angular unconformity, Vein, Geosyncline, Caliche, Lithification, Sand dune, Loam, Colluvial, Shale, Ventifact, Surficial, Soil texture
Inclined beds in a sedimentary rock that were formed at the time of deposition by currents of wind or water in the direction in which the bed slopes downward.
In sedimentary rocks, inclined layers of sedimentation resulting from the progressive deposition of granular materials over a sloping surface. The layers are within a single bed between true bedding planes. Cross-bedding lends textural and color pattern to building stone.
cross-lamination
Stratification inclined to the original horizontal surface upon which the sediment accumulated. It is produced by deposition on the slope of a dune or sand wave.
Stratification found in sedimentary rocks that is inclined with respect to the main bedding planes. It is diagnostic of shifting sediment (e.g. dunes) but can be very complex in three dimensions. Used to deduce palaeoflow of currents (wind or water) that carried the sediment and for establishing the stratigraphic way up of deformed sedimentary successions.
The arrangement of laminations of strata transverse or oblique to the main planes of stratification.
A characteristic of sedimentary rocks where different layers are laid down at angles to one another, that is, not all are laid horizontally, especially in sandstone derived from sand dunes.
Cross-bedding occurs in water and wind-laid sand deposits, such as dunes and ripple marks, as the sand and heavy minerals are transported and deposited. Cross-beds consist of light-colored sand layers and dark-colored heavy mineral layers deposited on the lee slope of the structure. Tabular cross-beds are straight. Trough cross-beds are curved due to scour and fill.
An arrangement of relatively thin layers of rock inclined at an angle to the more nearly horizontal BEDDING PLANES of the larger rock unit. Also referred to as cross-stratification.
Sedimentary structure created by layers of silt, sand, and/or gravel (greater than 1 cm thick) that are deposited in progressively building layers inclined at an angle to the main bedding. Checkerboard Mesa is a good example of preserved cross beds from ancient sand dunes.
(n) The arrangement of sedimentary beds tilted at different angles to each other, indicating that the beds were deposited by flowing wind or water.
A sequence of beds inclined at an angle to the main bedding planes in granular sediments.
In geology, cross-bedding refers to inclined sedimentary structures in a horizontal unit of rock; such tilted structures indicate the type of depositional environment, not post-depositional deformation.