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Noun geological period has 1 sense
  1. period, geological period - a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
    --1 is a kind of geological time, geologic time
    --1 is a part of era, geological era
    --1 has parts: epoch
    --1 has particulars:
     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
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