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The current geologic era which began 65.5 million years ago; also known as the Age of Mammals.
A subdivision of geologic time that is longer than an age but shorter than a period.
A unit of geologic time that includes two or more periods.
The process of change by which new species develops from preexisting species over time.
An ordered arrangement of rock layers that is based on the relative ages of the rocks and in which oldest rocks are at the bottom.
An episode during which large numbers of species become extinct.
The geologic time that lasted from 251 million 65.5 million years ago; AKA the Age of Reptiles.
The geologic time that followed Precambrian Time and that lasted from 542 million 251 million years ago.
- A unit of geologic time that is longer the Epoch but shorte than an Era.
The interval of time in the geologic time scale from Earth's formation to the beginning of Paleozoic Era, from 4.6 billion to 542 million years ago. The beginning of Earth's geologic time scale.
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