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Introduction to the Archaean ... 3.8 to 2.5 billion years ago ... If you were able to travel back to visit the Earth during the Archaean, you would likely not recognize it is the same planet we inhabit today. The atmosphere was very different from what we breathe today;
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www.ucmp.berkeley.edu/precambrian/archaean.html
www.ucmp.berkeley.edu/precambrian/archaean.html
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An overview of the era from the UC Berkeley Museum of Paleontology. ... Introduction to the Proterozoic Era ... The period of Earth's history that began 2.5 billion years ago and ended 543 million years ago is known as the Proterozoic.
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www.ucmp.berkeley.edu/precambrian/proterozoic.html
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A survey of Earth's Archean Period, including its geology, meteorology, and biology. ... It wasn't until the end of the Archean Period that protocontinental masses began to form actual continents. About 70% of the continental masses we know today were formed during the late Archean Period. During the Archean,
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www.associatedcontent.com/article/162625/earths_archean...
www.associatedcontent.com/article/162625/earths_archean_period.html
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The Archean is the name of the age which began with the forming Earth. The duration of the Archean, 2.8 billion years, is more than half the expected age of the Earth. We don't know much about this period, yet some of the most dramatic changes in Earth's history took place.
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www.windows.ucar.edu/tour/link=/earth/past/Archean.html...
www.windows.ucar.edu/tour/link=/earth/past/Archean.html&edu=high
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The Geological Time-Scale for the Archean Era ... This general period, from about 3.0 to 2.5 billion years ago, was the period of maximum continent formation. 70% of continental landmasses date from this period (Thus, most of the continents are extremely ancient).
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www.palaeos.com/Archean/Archean.htm
www.palaeos.com/Archean/Archean.htm
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asteroids may have been the impactors during the Archean period resulting in the formation of spherule beds because of their carbonaceous composition and ...
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www.springerlink.com/index/KV07424R88G73355.pdf
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The Archean is a geologic period; it is a somewhat antiquated term for the time span between 2500 million years before the present and 3800 million years before the present. The Archean period follows the Hadean period and is followed by the Paleoproterozoic period.
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www.websters-online-dictionary.org/ar/archaean.html
www.websters-online-dictionary.org/ar/archaean.html
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A period of geologic time from about 3.8 to 2.5 billion years ago (Ga). During the Archean Eon a large percentage of the Earth's continental crust formed, plate tectonics began, very warm climates and oceans existed, and life appeared on Earth in the form of unicellular organisms.
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www.answers.com/topic/archaean
www.answers.com/topic/archaean
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A Wisdom Archive on Archean period ... Archean period: Encyclopedia II - Sun - Structure ... More material related to Archean Period can be found here:
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www.experiencefestival.com/archean_period
www.experiencefestival.com/archean_period
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