geological period

How to sign: a unit of geological time during which a system of rocks formed
"ganoid fishes swarmed during the earlier geological periods";

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Similiar / Same: period

Categories: geological time, geologic time

Within this category: Cambrian, Carboniferous, Cretaceous, Devonian, ice age, Jurassic, Mississippian, Ordovician, Pennsylvanian, Permian, Quaternary, Silurian, Tertiary, Triassic