Word

geological period, n.

a unit of geological time during which a system of rocks formed
<noun.time>

geological period period

sample sentences

"ganoid fishes swarmed during the earlier geological periods"

semantic pointers

hypernym

geological time, geologic time

instance hyponym

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

part holonym

era, geological era

part meronym

hyponym

ice age, glacial period, glacial epoch