Cenozoic Era
The most recent of the four major eras of geological time, dating from about
65 million years ago to the present. It began as the last dinosaurs
became extinct, at the end of the Mesozoic
era, and is the era in which the mammals
flourished. Most of the placental mammals and all of the primates
evolved during the Cenozoic Era. Traditionally, the Cenozoic was divided
into two very unequal periods: the Tertiary (which made up the bulk of the
Cenozoic), and the Quaternary, which is the last one and a half million
years or so.
Related category
• GEOLOGY
AND PLANETARY SCIENCE
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