Geology has allowed the development of different classifications for geological time that have facilitated the study and organization of past events.
It is a term that refers to the geological time scale that covers the entire history of the Earth.
A geological era is a formal geochronological unit on the geological time scale. The eras are one of the major divisions of geological time, they are subdivisions of the eons and are divided in turn into periods
A geological period is a formal geochronological unit of the geological time scale. For example, the rocks of the Silurian system were formed during the Silurian period, or the fossils we find in rocks of the Jurassic system belong to organisms that lived during the Jurassic period.
A geological epoch is a formal geochronological unit of the geological time scale that represents the time corresponding to the duration of a series. Epochs are subdivisions of geological periods and are further divided into ages.
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