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Construction of a time scale that links the planets is, therefore, of only limited relevance to the Earth's time scale, except in the whole-solar-system context.
Dominantly fluid planets, such as the gas giants, do not preserve their history in a comparable manner.
Apart from the Late Heavy Bombardment, events on other planets probably had little direct influence on the Earth, and events on Earth had correspondingly little effect on those planets.
This clock representation shows some of the major units of geological time and definitive events of Earth history.
Different spans of time on the GTS are usually marked by changes in the composition of strata which correspond to those, and indicate major geological or paleontological events, such as mass extinctions.
For example, the boundary between the Cretaceous period and the Paleogene period is defined by the Cretaceous–Paleogene extinction event, which marked the demise of the non-avian dinosaurs and many other groups of life.
Evidence from radiometric dating indicates that Earth is about 4.54 billion years old.
The geology or deep time of Earth’s past has been organized into various units according to events which took place in each period.
Other subdivisions reflect the evolution of life; the Archean and Proterozoic are both eons, the Palaeozoic, Mesozoic and Cenozoic are eras of the Phanerozoic eon.The three million year Quaternary period, the time of recognizable humans, is too small to be visible at this scale.