WEBVTT

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Hi guys,

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the objective of this video is to look at

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the bedding structures that form
when sediment is deposited.

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These bedding structures all form 
in different environments.

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These environments which create the bedding 
structures will be discussed.

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Firstly,
we will talk about the horizontal beds,

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or strata,
that the sediment is laid down in.

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Sedimentary rock is stratafied,
which means that it has layers.

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These layers have formed because sediment 
is laid down in horizontal layers called strata.

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Between each layer of strata,
we have bedding planes.

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And these bedding planes form because 
the region has experienced

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a change in depositional 
environment or material.

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We can see here in this photo that we have 
had one type of sediment laid down.

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And then,
a change in depositional environment

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has caused a different type of sediment
to be laid down on top,

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in between which is a bedding plane.

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We know that the strata towards
the bottom of a series is older

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than the strata at the top.

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And this happens because the sediment 
is laid in this way.

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Bedforms are formations that occur due to 
the movement of wind and water.

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Bedforms are created when water or wind,
flows over loose sediment.

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And the shape and the texture of the bedform,
depends on the velocity of the flowing wind or water,

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and the size of the sediment.

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One type of bedform is ripples.

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Ripples occur to due the flow of water.

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Asymetrical ripples occur when water's 
just flowing in one direction.

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As we can see here.

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Symetrical ripples will occur 
when the waves oscillate back and forth.

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As we can see here.

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These bedforms can be preserved in
the sedimentary rock,

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because new sediment can be deposited on top.

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And the formation will remain the same
and will be lithified in this shape.

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Another type of bedform are dunes.

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Dunes form with the same formation process 
as the asymetrical ripples when they form

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due to water.

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However,
dunes form due to the action of wind.

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Cross Bedding is another type of 
bedform.

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Cross bedding forms in the process of 
making ripples or dunes.

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Whether