Archean Eon

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Archean Eon

or Archaean Eon or Archeozoic Eon

Older of the two divisions of Precambrian time. The Archean begins with the formation of the Earth's crust 4 billion years ago and extends to 2.5 billion years ago, up to the start of the Proterozoic Eon, the second division of the Precambrian Period. The earliest and most-primitive forms of life (bacteria and cyanobacteria) originated more than 3.5 billion years ago in the middle of the Archean Eon (the Archean's alternative name, Archeozoic, means “ancient life”).

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No references found			Byline: ANI Washington, August 19 (ANI): A team of scientists has determined that Carbonyl Sulphide gas warmed the world and saved it from freezing over during the Archean eon more than 3 billion years ago. Carbonyl Sulphide gas saved the world from freezing over 3 billion ... by Asian News International Most of the largest formations date from the late Archean eon, which ended around 2. The iron record of earth's oxygen: scientist are decoding the ... by Perkins, Sid / Science News His and Barley's analysis shows that rocks of the Archean eon, which are more than 2. Oxygen rocks: volcanoes spurred early atmospheric change by Barry, C. / Science News			Archaeology, Underwater Archaeoptera Archaeopteridales Archaeopteris Archaeopterygiformes Archaeopteryx Archaeornithes Archaic archaism Archallaxis archangel Archangelica Archangiaceae Archangium Archanthropinae archarium Archbald Pothole State Park archbishop archbishopric ArchBSD Archdeacon archdiocese archduchess Archduke Archean Archean Eon arched barrel roof arched beam arched butment arched buttress arched construction arched corbel table arched dormer arched tomb Archeda Archegoniatae archegoniophore archegonium archeion Archelaus archencephalon archenteron archeoastronomy archeocyte archeological chemistry archeological chronology archeology archeomagnetic dating archeometric Archeozoic Archeozoic era			archduke archduke archduke archduke Archduke Ferdinand II Archduke Ferdinand II Archduke Ferdinand II Archduke Franz Ferdinand of Austria Archduke Franz Ferdinand of Austria Archduke Franz Ferdinand of Austria archdukedom archdukedom archdukedom archdukes archdukes archdukes Arche Arche Arche ACORN User Club arche(o)- arche- arche- Archea Archea Archeabacteria Archeabacteria Archean Archean Archean Archean aeon Archean Eon Archean System Archean System Archebiosis arched arched arched arched arched arched arched barrel roof arched beam arched butment arched butment arched butment arched buttress arched buttress arched buttress arched construction arched corbel table arched dormer Arched Nose Arched Nose arched tomb Archeda archegonia archegonia archegonia archegonial archegonial archegonial

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