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Preferred term

precambrian eon  

Definition

  • The Precambrian eon, or Supereon, refers to the geological time comprising the eons that came before the Phanerozoic eon. This time spans from the formation of Earth around 4.5 billion years ago to the evolution of abundant macroscopic hard-shelled animals, which marked the beginning of the Cambrian era, the first period of the first era of the Phanerozoic eon. [Source: Encyclopedia of Global Warming & Climate Change; Precambrian Eon]

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https://concepts.sagepub.com/social-science/concept/precambrian_eon

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