What Causes Trough Cross Bedding?
Trough cross bedding is a type of sedimentary structure that forms due to the deposition of sediment in a trough-shaped depression. This depression can be caused by a variety of factors, including the presence of a river channel, a tidal channel, or a scour pit. The sediment that fills the trough is typically coarser than the surrounding sediment, and it is often graded, with the coarsest sediment at the base of the trough and the finest sediment at the top.
Trough cross bedding is a common feature of sedimentary rocks, and it can be used to interpret the depositional environment in which the rock was formed. For example, the presence of trough cross bedding in a sandstone indicates that the sandstone was deposited in a river channel or a tidal channel. The direction of the trough cross bedding can also be used to determine the direction of the current that deposited the sediment.
Factors that Affect Trough Cross Bedding
The size and shape of trough cross bedding is controlled by a variety of factors, including the velocity of the current, the depth of the water, and the size of the sediment particles. High-velocity currents will produce large, deep troughs, while low-velocity currents will produce small, shallow troughs. Deep water will produce troughs that are wider and more symmetrical than troughs that are formed in shallow water. Coarse sediment particles will produce troughs that are steeper and more angular than troughs that are formed from fine sediment particles.
Significance of Trough Cross Bedding
Trough cross bedding is a significant sedimentary structure because it can provide information about the depositional environment in which the rock was formed. It can also be used to interpret the direction of the current that deposited the sediment. Trough cross bedding is a common feature of sedimentary rocks, and it can be found in a variety of depositional environments, including rivers, tidal channels, and scour pits.
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