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The Cenozoic Era meaning "new life" is the current and most recent of the three geological eras of the Phanerozoic Eon.
Definition: an era of geological history lasting from 70 million years ago to the present time in which there has been a rapid evolution of mammals and birds and of flowering plants.
The Cenozoic is also known as the Age of Mammals because the terrestrial animals that dominated both hemispheres were mammals – the Eutherians and the Metatherians. The extinction of many groups allowed mammals and birds to greatly diversify so that large mammals and birds dominated the Earth. The continents also moved into their current positions during this era.