Hyponyms: Quaternary, Quaternary period, Age of Man, Tertiary, Tertiary period, Cretaceous, Cretaceous period, Jurassic, Jurassic period, Triassic, Triassic period, Permian, Permian period, Carboniferous, Carboniferous period, Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period, Mississippian, Missippian period, Lower Carboniferous, Lower Carboniferous period, Devonian, Devonian period, Age of Fishes, Silurian, Silurian period, Ordovician, Ordovician period, Cambrian, Cambrian period, ice age, glacial period, glacial epoch
Part Meronyms: era, geological era
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