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| Cenozoic |
the Cenozoic Era, or the rock formations that date from that time. [1/2 definitions] |
| Mesozoic |
of, relating to, or designating the geological era between the Paleozoic and the Cenozoic, from approximately 220 million to 65 million years ago, when dinosaurs appeared and became extinct and ferns were abundant. [1/2 definitions] |
| quaternary |
(cap.) of, relating to, or designating the latest geological period of the Cenozoic Era that includes the present and began approximately 1.8 million years ago, marked by widespread glaciers, the appearance of humans, and the development of human culture. [1/4 definitions] |
| tertiary |
of, relating to, or designating the earlier of two periods of the Cenozoic Era, from approximately 65 million to 1.8 million years ago, when high mountains such as the Alps and Himalayas were formed and mammals became prominent. [1/5 definitions] |
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