the law of superposition is the three group names
Nicolas Steno came up with the law of superposition. That being that if one strata is laid upon another, the one below is the oldest. This is in terms of sedimentary sequences.
According to the Law of Superposition, any sequence of rocks in layers, undisturbed, youngest on top, oldest at bottom
Sedimentary
relative
The age layers of rocks.
The Law of Superposition states that the oldest layer is at the bottom and the youngest at the top. Therefor, what is new builds upon what is preexisting.
This is the law of original horizontality. It is often used in support of evolution as it shows the age of different types of species.
By applying the law of superposition, relative dates can be determined. This law states that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest is on the bottom.
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youngest on top
The two types of age that the law of superposition gives you are relative and absolute. These findings are always based on observations of the natural history of the rocks.