HyperDic: geological_period

English > 1 sense of the expression geological period:
NOUNtimegeological period, perioda unit of geological time during which a system of rocks formed
English > geological period: 1 sense > noun 1, time
MeaningA unit of geological time during which a system of rocks formed.
Example"ganoid fishes swarmed during the earlier geological periods"
InstancesCambrian, Cambrian periodFrom 544 million to about 500 million years ago
Carboniferous, Carboniferous periodFrom 345 million to 280 million years ago
Cretaceous, Cretaceous periodFrom 135 million to 63 million years ago
Devonian, Devonian period, Age of FishesFrom 405 million to 345 million years ago
Jurassic, Jurassic periodFrom 190 million to 135 million years ago
Mississippian, Missippian period, Lower Carboniferous, Lower Carboniferous periodFrom 345 million to 310 million years ago
Ordovician, Ordovician periodFrom 500 million to 425 million years ago
Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous periodFrom 310 million to 280 million years ago
Permian, Permian periodFrom 280 million to 230 million years ago
Quaternary, Quaternary period, Age of Manlast 2 million years
Silurian, Silurian periodFrom 425 million to 405 million years ago
Tertiary, Tertiary periodFrom 63 million to 2 million years ago
Triassic, Triassic periodFrom 230 million to 190 million years ago
Part ofera, geological eraA major division of geological time
PartsepochA unit of geological time that is a subdivision of a period and is itself divided into ages
Narrowerice age, glacial period, glacial epochAny period of time during which glaciers covered a large part of the earth's surface
Broadergeological time, geologic timeThe time of the physical formation and development of the earth (especially prior to human history)
Spanishperiodo, período

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