The determination that a granite pluton is not intrusive into overlying sedimentary layers because there are pebbles of granite in the bottom-most layer is an application of the Principle of

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This is an example of the Principle of Inclusions, which states that inclusions found within a rock layer must be older than the layer they are found in. In this case, the pebbles of granite found in the bottom-most sedimentary layer indicate that the granite was already present and eroded before the sedimentary layers were deposited on top, suggesting that the granite pluton did not intrude into the sedimentary layers.

The Determination That a Granite Pluton Is Not Intrusive into Overlying