The Precambrian.
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The largest geological time division is an eon. Eons are divided into eras, which are further divided into periods, epochs, and ages. The current eon is the Phanerozoic eon, which began about 541 million years ago and is still ongoing.
The largest division of geological time is called an eon. Eons are subdivided into eras, which are further divided into periods, epochs, and ages.
Eon
Cenozoic Mesozoic Paleozoic Precambrian
The third largest division of geologic time is an era. The eras are further divided into periods, epochs, and ages.
The largest divisions of time on the geological time scale are eons, which are the longest units of time and are further divided into eras. The current eon, the Phanerozoic Eon, is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. Each era is further subdivided into periods, epochs, and ages.