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Stratigraphy
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The classical principles of reading rock layers: Principle of Original Horizontality, Principle of Faunal Succession and Principle of Cross-Cutting Relationships, the three foundational relative-dating principles of the discipline. Belongs here: a concept establishing how to read the relative age or original arrangement of rock layers. Does not belong here: a concept about absolute, numeric dating methods, held under Geochronology.
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