cross-stratification


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cross-strat·i·fi·ca·tion

 (krôs′străt′ə-fĭ-kā′shən, krŏs′-)
n.
An arrangement of sediment strata deposited at an angle to the prevalent orientation of stratification, usually produced by the migration of sand dunes or ripples.
References in periodicals archive ?
Measurements of cross-stratification, in total 58, were done to determine the direction of palaeotransport and to study bedform morphology.
The oldest Devonian deposits exposed in the vicinity of the Borschovo Village are siliciclastic ones, such as white sandstones with trough cross-stratification and clay clasts.
Finally, in aeolian dunes the large-scale cross-stratification mostly forms a single set and is laterally discontinuous.
Nevertheless, in sandy gravel sediments of subaqueous dunes, the cross-stratification mainly consists of grain flow deposits with little or no grain fall deposition on most of their lee faces (Kleinhans, 2004), suggesting that the sediment was delivered in pulses: rolling grain deposits for the coarsest sediments, however, are also common (Kleinhans, 2004).
It displays abundant, well developed, large scale, cross-stratification and is the remains of a deflated Pleistocene seif dune created in response to the palaeo-Shamal winds (Kirkham, 1998a).
The limestone is thin to thick bedded, finely crystalline micritic, partly arenaceous and possesses various types of primary sedimentary structures, such as hummocky cross-stratification, parallel lamination, cross- bedding and longitudinal ridges.
For example, the rather terse section on storm deposits deals at moderate length with the formation of hummocky cross-stratification, a subject dealt with at length in a separate entry.
Large wave ripples with low-angle cross-stratification were generated by combined flows, but in the more distal mid-ramp setting, where the relatively weak unidirectional current allowed the bedforms to migrate preferentially (Dumas & Arnott 2006).
The uppermost thick sandstone levels display cross-stratification generated by hydraulic dunes, indicating palaeocurrents from the W and WNW.
Description: The cross-bedded channel sandstone facies consists of laterally persistent sheets of sandstone, dominated by large trough cross- stratification with subordinate small-scale, planar and trough cross-stratification (Plate 3).
In some sections it shows the following upward evolution: parallel-horizontal or slightly undulated (large wavelength) lamination, hummocky cross-stratification (HCS) of decimetric to metric apparent wavelenght and wave ripple cross stratification (Fig.