Superposition is a relative age dating principle which states

Thus, we can deduce that the mudstone and shale are older than the rhyolite dike.But, since the rhyolite dike does not cut across the shale, we know the shale is younger than the rhyolite dike.A more modern way of stating the same principle is that the laws of nature (as outlined by the laws of chemistry and physics) have operated in the same way since the beginning of time, and thus if we understand the physical and chemical principles by which nature operates, we can assume that nature operated the same way in the past.Principle of Superposition Because of Earth's gravity, deposition of sediment will occur depositing older layers first followed by successively younger layers.He concluded that process that are currently operating on the Earth must be the same processes that operated in the past.This principle is often stated as "the present is the key to the past".

How do we know this and how do we know the ages of other events in Earth history?Once these age relations were worked out, another principle fell into place - the principle of fossil succession.We discuss the 7 principles of stratigraphy first and then see how these apply to fossils.In either case, the inclusions had to be present before they could be included in the younger rock, therefore, the inclusions represent fragments of an older rock.This principle is often useful for distinguishing between a lava flow and a sill.

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