The beginning and end points of eras, epochs, and periods on the geologic time scale are set by Numerical ages.
A representation of time based on Earth's rock record is called the geologic time scale, or GTS. It is a method of chronological dating that makes use of geochronology and chronostratigraphic, which relate strata to time (scientific branch of geology that aims to determine the age of rocks).
It is largely used to explain the timing and linkages of events in the history of the Earth by Earth scientists, such as geologists, paleontologists, geophysicists, and geochemists. The study of rock layers, observation of their correlations, and identification of elements like lithologies, paleomagnetic characteristics, and fossils have all contributed to the development of the geologic time scale.
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