The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time. It is used by geologistspaleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth’s history

Know more:
https://www.geosociety.org/GSA/Education_Careers/Geologic_Time_Scale/GSA/timescale/home.aspx

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