cross-stratification


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cross-stratification

[′krȯs ‚strad·ə·fə′kā·shən]
(geology)
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7 m thick, are dominated by trough cross-stratification structure, which indicates the transport and sedimentation of sand material in the lingoid subaqueous dunes, under the influence of traction currents.
Thickness of the sandstone beds range from 4 to 200 cm; they are lenticular, showing pinch and swell morphology, hummocky cross-stratification, parallel lamination (Plate 1a), trough cross-bedding, flute casts, load casts (Plate.
The limestone succession displays pinch and swell morphology, parallel-lamination, hummocky cross-stratification, low-angle cross- bedding, and longitudinal ridges at their bases.
Origin of hummocky and swaley cross-stratification - the controlling influence of unidirectional current strength and aggradation rate.
10) of shales and sandstones with different types of cross-stratification and cross-lamination (hydraulic dunes and ripples respectively).
The Formation is made up of purple polygenic and polymodal conglomerates with a poorly-sorted sandy matrix supported fabric displaying a variable crude cross-stratification.
This unit shows different types of cross-stratification magnified by clast alignments locally.
In several cases, some cross-stratifications indicate that the sediment was transported by a variety of bars in a braided context.
Sandstone beds have trough and planar cross-stratification in Nagri Formation, near Bahadar Khel old bridge.
Furthermore, current ripple cross-lamination, trough cross-stratification and planar stratification were formed by deposition associated with migrating current ripples, dunes, and upper stage plane beds, respectively (Bridge, 1993).