What is superposition and why is it so important?
Superposition states that in a sequence of layered, horizontal beds (sometimes called strata), the oldest bed (layer) is on the bottom and the beds get younger as you move towards the top of the set.
The law of superposition was proposed by Nicolaus Steno just over 300 years ago.
Superposition assumes that the beds are undisturbed (were not overturned, for example).
It would also work for a series of lava flows that have been laid down, one atop the other in a similar horizontal sequence.
Superposition is an important and fundamental law because it helps determine the relative ages of rock layers. It helps us determine the geologic history of an area.
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