Answer :
According to geological time scales, events in Earth's history have been "calendarized". In descending order of time duration, all time have been divided into predetermined abstract time units which is known as eons, eras, periods, epochs, and ages.
What does geological timescale mean?
The timeline created from the Earth's geological record is known as the geological timescale (GTS). It is a method of chronological dating using chrono stratigraphy and geochronology that associates strata with time; the scientific branch of geology aimed at determining the age of rocks. A geological timescale is a set of stratigraphic-based measurements of time. The time scale consists of eons, eras, epochs, and ages, with eons indicating the longest duration and ages the shortest. In descending order of duration, divides all time into named abstract units of time called eons, eras, periods, epochs, and ages.
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