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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.The Grand Canyon is particularly good for this because different sedimentary rocks have different colors.For example, the mudstone, sandstone and shale are cut by the basalt dike, so we know that the mudstone, sandstone, and shale had to be present before the intrusion of the basalt dike.In the diagram to the right,the fault cuts the limestone and the sandstone, but does not cut the basalt.Thus we know that the fault is younger than the limestone and shale, but older than the basalt above.Principle of Inclusions If we find a rock fragment enclosed within another rock, we say the fragment is an inclusion.

Note that you can follow the layers all along the walls of the canyon, and you can find the same layers on both sides of the canyon.

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.

From the beginning of this course, we have stated that the Earth is about 4.6 billion years old.

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

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