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EON ERA ... Notes and Events ... The Archean Eon of Precambrian Time: 3.8 - 2.5 billion years ago...
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www.palaeos.com/Archean/Archean.htm
www.palaeos.com/Archean/Archean.htm
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The Archean Eon is the second geologic eon in the Earth's history, beginning at the end of ... The Archean begins shortly after a drawn-out series of events called the Late Heavy Bombardment, during which pieces of solar debris which had not yet formed into planets were getting drawn into the gravity well that is the Earth.
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www.wisegeek.com/what-is-the-archean-eon.htm
www.wisegeek.com/what-is-the-archean-eon.htm
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Encyclopedia article of Archean eon at Reference.com compiled from comprehensive and current sources.
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www.reference.com/browse/Archean+eon
www.reference.com/browse/Archean+eon
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Archean eon and Early Proterozoic era (3.8. Ga – 2.5 Ga) ... astrophysical events such as supernovae explosions or GRB's were potentially bigger ...
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The Archean eon comprises four subdivisions called eras. From the earliest to the most recent, they are: the Eoarchean, the Paleoarchean, ... Others argue that the sub continental lithospheric mantle is too buoyant to subduct and that the lack of Archean rocks is a function of erosion by subsequent tectonic events.
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www.newworldencyclopedia.org/entry/Archean
www.newworldencyclopedia.org/entry/Archean
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Proterozoic - Wikipedia, the free encyclopedia
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The Proterozoic (pronounced /ˌproʊt ə rəˈzoʊ ɪ k/ ) is a geological eon representing a period before the first abundant complex life on Earth. The name Proterozoic comes from the Greek "ea...
en.wikipedia.org/wiki/Proterozoic
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Evidence for extreme events. • Global Temperature appears to be about the ... through Archean (and Proterozoic) Eon(s) indicate lack of herbivores for over ...
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www.salemstate.edu/~bhubeny/GLS201/Archean.pdf
www.salemstate.edu/~bhubeny/GLS201/Archean.pdf
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During the time known as the Archean (~4 billion to 2.5 billion years ago) stromatolite fossils are very rare. Canada has three of the world's known examples at Red Lake, Ontario, Steep Rock Lake, Ontario, and near Yellowknife, Northwest Territories.
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geol.queensu.ca/museum/exhibits/archean/archean.html
geol.queensu.ca/museum/exhibits/archean/archean.html
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Major Tectonic Events ... "Stromatolites become increasingly abundant in younger Archean successions, a pattern as likely to reflect craton growth as evolutionary change. By the end of the eon, extensive carbonate platforms supported widespread mat-building communities that almost certainly included cyanobacteria."
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www.peripatus.gen.nz/paleontology/Archaean.html
www.peripatus.gen.nz/paleontology/Archaean.html
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