Answer :
Law of superposition fundamental concept states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it.Thus correct option (D).
A key stratigraphic principle known as the law of superposition states that the oldest layer in a series of sedimentary rock layers is at the bottom and that the layers get younger as they move up the sequence.
An underground drain, for instance, might form its silt back-fill some time after the ground directly above it. Other instances of non-vertical superposition include changes made to existing structures, such as adding new windows and doors to a wall.
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