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You may be referring to an "outlier" which is an area of older rocks surrounded by younger ones due to faulting and erosion removing layers of younger rocks and forcing older ones up into them.

You may also potentially be referring to a xenolith. This is a fragment of older material that has not melted that is trapped within lava or other younger igneous material.

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11y ago
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14y ago

This can happen. They are often called xenoliths, where an older rock which is buried deep within the Earth gets caught in uprising molten magma; the magma covers it, then cools to form a new layer of rock around it.

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11y ago

older rock layers lie underneath younger rock layers

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13y ago

If you're talking about igneous rock, then the older rock in the younger is a xenolith

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12y ago

Superposition

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13y ago

This is called the Law of Superposition.

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12y ago

inclusions

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Q: What are older rocks that lie under younger rocks called?
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the answer is the principle of superposition


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