Hi guys,
the objective of this video is to look at
the bedding structures that form when sediment is deposited.
These bedding structures all form in different environments.
These environments which create the bedding structures will be discussed.
Firstly, we will talk about the horizontal beds,
or strata, that the sediment is laid down in.
Sedimentary rock is stratafied, which means that it has layers.
These layers have formed because sediment is laid down in horizontal layers called strata.
Between each layer of strata, we have bedding planes.
And these bedding planes form because the region has experienced
a change in depositional environment or material.
We can see here in this photo that we have had one type of sediment laid down.
And then, a change in depositional environment
has caused a different type of sediment to be laid down on top,
in between which is a bedding plane.
We know that the strata towards the bottom of a series is older
than the strata at the top.
And this happens because the sediment is laid in this way.
Bedforms are formations that occur due to the movement of wind and water.
Bedforms are created when water or wind, flows over loose sediment.
And the shape and the texture of the bedform, depends on the velocity of the flowing wind or water,
and the size of the sediment.
One type of bedform is ripples.
Ripples occur to due the flow of water.
Asymetrical ripples occur when water's just flowing in one direction.
As we can see here.
Symetrical ripples will occur when the waves oscillate back and forth.
As we can see here.
These bedforms can be preserved in the sedimentary rock,
because new sediment can be deposited on top.
And the formation will remain the same and will be lithified in this shape.
Another type of bedform are dunes.
Dunes form with the same formation process as the asymetrical ripples when they form
due to water.
However, dunes form due to the action of wind.
Cross Bedding is another type of bedform.
Cross bedding forms in the process of making ripples or dunes.
Whether