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During Which Aeon Did Mammals Develop?

Marcus Vance • • 6 min read
During Which Aeon Did Mammals Develop?

The period between the extinction of the dinosaurs and the present day is called the Age of Mammals or Cenozoic. Mammals appeared on the earth long before the extinction of the dinosaurs; in fact, dinosaurs and mammals originated within 10 million years of each other, in the late Triassic

late Triassic
The Late Triassic is the third and final epoch of the Triassic Period in the geologic time scale. The Triassic–Jurassic extinction event began during this epoch and is one of the five major mass extinction events of the Earth. ... The Late Triassic spans the time between 237 Ma and 201.3 Ma (million years ago).
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about 200 million years ago.

During which period did mammals first appear?

Mammals were derived in the Triassic Period (about 252 million to 201 million years ago) from members of the reptilian order Therapsida.

What era did mammals evolve?

In the early Cenozoic era, after the dinosaurs became extinct, the number and diversity of mammals exploded. In just 10 million years -- a brief flash of time by geologic standards -- about 130 genera (groups of related species) had evolved, encompassing some 4,000 species.

Marcus Vance
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Marcus Vance

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.