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System
idealized composite unit of the geologic record representing the totality of rock strata laid down during a certain period of the geologic time scale
Neogene
Carboniferous
Tertiary
Columbian
Quaternary
Hesperian
Cretaceous
Jurassic
Triassic
Paleogene
Ordovician
Silurian
Devonian
Permian
Cambrian
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