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Geologiske tidsskala:

Den geologiske tidsskala (GTS) er et system baseret på kronologisk datering, der relaterer stratigrafi til tid. Det er ikke en tidsskala ligesom vores kalender, som vi bruger i dag. Istedet deler den jordens historie op i forskellige perioder, som er forskellige i længde og som er baseret på væsentlige begivenheder i Jordens histore, som har skabt en slags grænse i bjergarterne. Tidsskalaen er delt op i Æoner (en: Eon), Æra ( en: Era), Perioder og Epoker (en: Epochs).

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