Geologic time scale

The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks). It is used primarily by Earth scientists (including geologists, paleontologists, geophysicists, geochemists, and paleoclimatologists) to describe the timing and relationships of events in geologic history.

Extends: [Geologic time scales](https://wikipedia.org.ai/Geologic time scales), [Geology timelines](https://wikipedia.org.ai/Geology timelines), [Natural history](https://wikipedia.org.ai/Natural history), [Evolution-related timelines](https://wikipedia.org.ai/Evolution-related timelines), Geochronology