Our transcription: And, finally, any geologic feature that cuts across or truncates a group of rocks has to be younger than the rocks that are cut.
So features such as faults, intrusions of molten rock, and erosional surfaces can also be placed in a relative age sequence using this principle called "cross-cutting relationships."
Although these geologic principles are based on nothing more than common sense, they are absolutely fundamental to the interpretation of Earth history.
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