The history of the Earth, which began with the formation of the planet approximately 4.5 billion years ago, is divided into named units of unequal ranks like «Mesozoic», «Triassic», «Jurassic», «Cretaceous» and so on (see below).

This chronology of relative time sequences has always remained the same.

In addition, there is an absolute time measure mainly based on radiometric methods. These specifications of absolute ages are consistently changing with ongoing scientific research.

The current Geologic Time Scale / Chronostratigraphic Chart with up-to-date numerical ages published by the International Commission on Stratigraphy can be looked up > here

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BRINKMANN, W. & DE BAETS, K. (2012) (eds): Paleontological Museum of the University of Zürich. Exhibition guide, 108 pp.

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Chart of Earth history with important organismic events (BRINKMANN & DE BAETS 2012)