Relative dating geology practice Unblocked cams

Posted by / 15-Nov-2017 22:13

Since sedimentary rocks are composed of sediment that must be cemented and packed down, sedimentary rock layers are originally horizontal or close to it.If the rock layers are no longer horizontal, this is because of changes in the environment that occurred after the formation of the sedimentary rock.Inclusions occur where a sedimentary rock forms around a foreign object.The foreign object is thus older than the sedimentary rock because it was there before the sediment that formed the rock.The law of superposition states that for any selected rock layer, the layer above is typically younger than it is and the layer below is generally older than it is.

Relative dating is an important topic in AP Environmental Science.Faunal succession is also used to compare fossils of organisms in different areas on the Earth.Since many plants and animals have large habitats, this can be very useful in helping to date sediment layers of interest.This can be a challenging concept to understand, but if you imagine a basin where sediment is deposited, this principle states that the sediment will be equally deposited in this area until there is no more sediment or until the sediment reaches the edge of the basin or another barrier.Using a mental picture to understand this concept can be very helpful.

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The law of faunal succession deals with the fossils of plants and animals and states that groups of fossilized animals and plants follow or succeed each other in a predictable manner.

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