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  • Proterozoic - Wikipedia
    The Proterozoic is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic and Neoproterozoic [8] It covers the time from the appearance of free oxygen in Earth's atmosphere to just before the proliferation of complex life on the Earth during the Cambrian Explosion
  • Proterozoic Eon | Oxygen Crisis, Animals, Facts | Britannica
    During the Proterozoic, the atmosphere and oceans changed significantly Its rocks contain the fossil remains of bacteria and blue-green algae as well as the first oxygen-dependent animals
  • Proterozoic Eon—2. 5 Billion to 541 MYA - U. S. National Park Service
    The Proterozoic Eon is the most recent division of the Precambrian It is also the longest geologic eon, beginning 2 5 billion years ago and ending 541 million years ago
  • The Proterozoic Eon
    The Precambrian is divided into three eons From youngest to oldest, they are: the Proterozoic, the Archean, and the Hadean (this latter being an informal name)
  • 8. 5: Proterozoic Eon - Geosciences LibreTexts
    The Proterozoic Eon, meaning “earlier life,” is the eon of time after the Archean eon and ranges from 2 5 billion years old to 541 million years old During this time, most of the central parts of the continents had formed and the plate tectonic process had started
  • What is Proterozoic? - Earth. com
    It is meaning earlier life, is a geologic eon that follows the Archean It represents the time just before the proliferation of complex life on Earth This time period extended from 2 5 billion years ago (Ga) to 542 million years ago (Ma or Mya)
  • Proterozoic - New World Encyclopedia
    The Proterozoic eon is an interval of geologic time of nearly 2 billion years extending from about 2500 million years ago (mya) to about 542 mya
  • GEOL 102 The Proterozoic Eon - UMD
    Eukaryotes remain unicellular for most of the Proterozoic Life remains entirely aquatic, but food chains get more complex with diversifying levels of heterotroph consumers and detritivores and phototroph producers
  • Proterozoic Eon (2. 5 billion – 541 million years ago) – Oxygen builds . . .
    The Proterozoic Eon, spanning from approximately 2 5 billion to 541 million years ago, represents a significant chapter in Earth’s geological and biological history This eon is the second of the four major divisions of geological time, following the Archean Eon and preceding the Phanerozoic Eon
  • Proterozoic Eon: Eukaryotes to Multicellular Life (2500 to 541 million . . .
    The Proterozoic Era was a time period in Earth’s geologic history that spanned from about 542 to 2500 million years ago It was a long era with numerous changes to the Earth’s system like multicellular life





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