What does Proterozoic eon mean?

Definitions for Proterozoic eon
pro·tero·zoic eon

This dictionary definitions page includes all the possible meanings, example usage and translations of the word Proterozoic eon.

Princeton's WordNet

  1. Proterozoic, Proterozoic eon, Proterozoic aeonnoun

    from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms


  1. proterozoic eon

    The Proterozoic ( ) is a geological eon spanning the time interval from 2500 to 538.8 million years ago. It is the most recent part of the Precambrian "supereon". It is also the longest eon of the Earth's geologic time scale, and it is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic, and Neoproterozoic.The Proterozoic covers the time from the appearance of oxygen in Earth's atmosphere to just before the proliferation of complex life (such as trilobites or corals) on the Earth. The name Proterozoic combines two forms of ultimately Greek origin: protero- meaning 'former, earlier', and -zoic, 'of life'.The well-identified events of this eon were the transition to an oxygenated atmosphere during the Paleoproterozoic; the evolution of eukaryotes; several glaciations, which produced the hypothesized Snowball Earth during the Cryogenian Period in the late Neoproterozoic Era; and the Ediacaran Period (635 to 538.8 Ma) which is characterized by the evolution of abundant soft-bodied multicellular organisms and provides us with the first obvious fossil evidence of life on earth.


  1. proterozoic eon

    The Proterozoic Eon is a specific span of geological time that extended from about 2.5 billion to 541 million years ago. It is the most recent part of the "Precambrian" time or the time before the current Phanerozoic Eon. The Proterozoic Eon is characterized by the abundance of primitive, mostly unicellular life forms, the increase in oxygen present in Earth's atmosphere, and significant geological activities such as the formation of several supercontinents.

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  1. Chaldean Numerology

    The numerical value of Proterozoic eon in Chaldean Numerology is: 7

  2. Pythagorean Numerology

    The numerical value of Proterozoic eon in Pythagorean Numerology is: 5


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