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The Age of Mammals

By the Cretaceous–Paleogene extinction, Pangea was fully separated but still had a little bit to go. This also marks the end of the Mesozoic Era and the beginning of the Cenozoic, Also known as the Age of Mammals, from Greek καινός kainos "new", and ζωή zoe "life". It is divided into Paleogene period, the neogene period and the quaternary period (current).

Source: Carl Sagan, Cosmos (New York: Random House, 1980)

Pangea 60M
A mollweide map of Earth 60 million years ago, overlayed by a black outline of present-day countries in their respective locations
Image by Scotese, Christopher R.; Vérard, Christian; Burgener, Landon; Elling, Reece P.; Kocsis, Ádám T., under CC BY 4.0 license

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Full disclosure, I may occasionally borrow a sentence from Will Durant's Story of Civilization. I absolutely love that collection!