period.n.04Level 6

period

a unit of geological time during which a system of rocks formed

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cambrian.n.01Cambrian

carboniferous.n.01Carboniferous

cretaceous.n.01Cretaceous

devonian.n.01Devonian

ice_age.n.01ice age

jurassic.n.01Jurassic

mississippian.n.01Mississippian

ordovician.n.01Ordovician

pennsylvanian.n.01Pennsylvanian

permian.n.01Permian

quaternary.n.01Quaternary

silurian.n.01Silurian

tertiary.n.01Tertiary

triassic.n.01Triassic

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