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Thus, we know that the dike is younger than the mudstone, sandstone, and shale.Similarly, the rhyolite dike cuts only the mudstone and the sandstone, but does not cut across the shale.By carefully digging, we have found that each trash pit shows a sequence of layers.Although the types of trash in each pit is quite variable, each layer has a distinctive kind of trash that distinguishes it from other layers in the pits.Thus, in a sequence of layers that have not been overturned by a later deformational event, the oldest layer will be on the bottom and the youngest layer on top.This is the same principle used to determine relative age in the trash pits discussed previously.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.

How do we know this and how do we know the ages of other events in Earth history?

Principle of Uniformitarianism The principle of Uniformitarianism was postulated by James Hutton (1726-1797) who examined rocks in Scotland and noted that features like mudcracks, ripple marks, graded bedding, etc.

where the same features that could be seen forming in modern environments.

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.

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