The Cretaceous is the youngest Mesozoic period, approximately to million years ago in the dated chart used here.[ref]
International Chronostratigraphic Chart by International Commission on Stratigraphy (2026-06). Cretaceous row
A numerical boundary estimate is a calibration of the geological time scale, not an assertion that every local geological process changed simultaneously. Stratigraphy establishes correlations; radiometric dating supplies numerical age constraints. Articles by others on the same topic
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