Relating to or belonging to the Cenozoic Era, the geological time period from about 66 million years ago to the present, characterized by the rise of mammals.
From Greek kainos (new, recent) + zoikos (of animals), literally 'age of new animals.' The term was coined in the 19th century by paleontologists studying rock layers and fossils.
The Cenozoic is often called the 'Age of Mammals' because after dinosaurs died out, mammals exploded into thousands of species—including eventually us humans, who arrived only in the last blink of this era!
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