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Definition of geologic time scale

The Geologic Time Scale (GTS) is an arbitrary chronological arrangement or sequence of geologic events, used as a measure of the relative or absolute duration or age of any part of geologic time, and usually presented in the form of a chart showing the names of the various rock-stratigraphic, time-stratigraphic, or geologic-time units.

The table of geologic time spans presented here agrees primarily with the nomenclature, dantes and standard color codes as set forth by the International Commission on Stratigraphy. This, however, only goes back as far as the age of the Earth (4.54 billion years). A proposal has been made to formally define the periods of the evolution of the Solar System before the Earth was formed going back to approximately 5 billion years. This is added into our chart as the chaotian period.

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