cross bedding


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Related to cross bedding: Ripple marks

cross bedding

n
(Geological Science) geology layering within one or more beds in a series of rock strata that does not run parallel to the plane of stratification. Also called: false bedding
References in periodicals archive ?
Distinctive structures of these rocks, such as ripple marks, mud cracks, and cross bedding, are discussed.
A broad range of sedimentary structures are recognised, including different forms of bedding, cross bedding, ripple forms, ripple stratification, channels, flute casts, load casts, desiccation cracks, rain imprints, cone-in-cone structures, a variety of concretions and bioturbation (Ghazi, 2009).
This type of cross bedding forms from the migration of straight-crested (transverse) dunes.
Bedding planes, such as cross bedding, inclined bedding, and horizontal bedding, often weaken a sandstone formation.
Another common geologic feature is known as cross bedding.
The common sedimentary structures such as trough cross bedding, plannar lamination, tabular cross bedding and herringbone are observed in grey sandstone units that clearly indicates strong fluvial system whereas hummocky cross stratification, ripple cross lamination and, bioturbation indicate marginal marine facies.
The top of the conglomeratic section, with a thickness of about 125-130 m is characterised by levels showing different types of middle and small scale cross bedding (Fig.
Sandstone beds are mainly composed of quartz grains and display large-scale cross bedding.
Mark and Ali (1961) and Ali (1962) studied the Tanawal Formation near Tarbela as well in the presently studied area and described preponderance of well- bedded quartzites with excellent cross bedding and ripple marks.