Geologists divide deep history into time periods known as eras. Eras are generally based on the fossil life forms observed. The oldest of the geological eras is the Eoarchean, which began approximately four billion years ago. The majority of the fossil evidence that we have for primate evolution comes from the Cenozoic era—the current geological era, dating from 65 million year ago (MYA) to the present. The Cenozoic era is divided into a series of epochs. Each epoch is associated with specific forms of primates that evolved during that time period.
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The content of this course has been taken from the free Anthropology textbook by Openstax