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Noun: Tertiary period
  1. The geological period from approximately 65 million to 2.6 million years ago, marked by the development of mammals
    "Many modern mammal groups evolved during the Tertiary period";
    - Tertiary

Derived forms: Tertiary periods

Type of: geological period, period

Part of: Age of Mammals, Cainozoic, Cenozoic, Cenozoic era

Encyclopedia: Tertiary period