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 WordNet Dictionary |
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| | Definition: | | [n] a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods" |
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| | Synonyms: | | period |
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| | See Also: | | Age of Fishes, Age of Man, Cambrian, Cambrian period, Carboniferous, Carboniferous period, Cretaceous, Cretaceous period, Devonian, Devonian period, epoch, era, geologic time, geological era, geological time, glacial epoch, glacial period, ice age, Jurassic, Jurassic period, Lower Carboniferous, Lower Carboniferous period, Missippian period, Mississippian, Ordovician, Ordovician period, Pennsylvanian, Pennsylvanian period, Permian, Permian period, Quaternary, Quaternary period, Silurian, Silurian period, Tertiary, Tertiary period, Triassic, Triassic period, Upper Carboniferous, Upper Carboniferous period |
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