Answer:
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Step-by-step explanation:
Geologists designate the different time periods in Earth's ancient past using a geological time scale, which is divided into eons, eras, periods, epochs, and ages.
The boundaries between these time periods are typically marked by significant geological or biological events, such as mass extinctions, major climate shifts, or the appearance of new species.
The most recent eon, the Phanerozoic, is divided into three eras: the Paleozoic, Mesozoic, and Cenozoic. Each era is further divided into periods, which are subdivided into epochs, and ages.
The time periods are named after locations, features, or characteristics that are representative of that time, such as the Cambrian Period or the Jurassic Period.