Cenozoic Era
The most recent geological era, 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.
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• GEOLOGY AND PLANETARY SCIENCE
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