Paleozoic definition

  • adjective:
    • Of, owned by, or designating the age of geologic time which includes the Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, and Permian periods and is described as the look of marine invertebrates, ancient fishes, land flowers, and ancient reptiles. See dining table at geologic time.
    • Of a geologic era inside the Phanerozoic eon that comprises the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian times from about 542 to 250 million years back, through the age trilobites compared to that of reptiles.
    • Of or regarding, or designating, the older division of geological time during which life is known to have existed, such as the Silurian, Devonian, and Carboniferous centuries, also to living or stones of those centuries. See Chart of geology.
    • of or relating to or denoting the Paleozoic period
  • noun:
    • The Paleozoic Era.
    • The Paleozoic time or strata.
    • from 544 million to about 230 million years ago
  • proper-noun:
    • The Paleozoic era.
  • others:
    • In geology, owned by or constituting a geological development characterized by the presence of ancient kinds of life: put on the earliest division for the geological series, starting with the cheapest stratified fossiliferous group, and expanding up towards root of the Triassic, or even to the top of the Permian.

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