Cenozoic
Mesozoic
Paleozoic
Precambrian
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The Precambrian.
The largest division of geological time is called an eon. Eons are subdivided into eras, which are further divided into periods, epochs, and ages.
The four geological time intervals are Precambrian, Paleozoic, Mesozoic, and Cenozoic. These intervals are used by geologists to divide Earth's history into distinct periods based on changes in life forms, climate, and geological events. Each interval spans millions of years and is characterized by significant geological and biological developments.
An eon is a long and indefinite period of time, often used in a geological or cosmological context to describe vast stretches of time. It is a term used to denote a specific era or era subdivision in the geological time scale.
Eon