The Cenozoic is the geological era from 66.00 million years ago to the present. It comprises the Palaeogene, Neogene and Quaternary. Its subdivisions organize geological and climate records; their boundaries are defined stratigraphically, with numerical ages calibrated separately.[ref]
International Chronostratigraphic Chart by International Commission on Stratigraphy (2026-06). Cenozoic and Mesozoic columns; numerical ages in Ma
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