Topic: Archean Era
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What is the Archean era?
The Archean era is the earliest Precambrian era, archean means "ancient" or "beginning". The Archean era starts with the oldest known rocks, about 4.6 billion years ago. Read More »
Source: http://wiki.answers.com/Q/What_are_Archean_eons
Which gas was absent in the Early Archean Era?
Oxygen was generally absent from the atmosphere during the Early Archean Era. Read More »
Source: http://wiki.answers.com/Q/Which_gas_was_absent_in_the_Early_Arche...
What animals and plants existed during the Archean Era?
Cyanobacteria existed during the Archean Era. Some sites may say stromatolites but in truth, stromatolites are simply structures formed by the cyanobacteria. Read More »
Source: http://wiki.answers.com/Q/What_animals_and_plants_existed_during_...
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Archean Era
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A reducing atmosphere of methane, ammonia, and other gas...
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The Hadean Eon: 4560 to 3800 million years ago; Archean Eon: 3.8 - ... ...MORE...
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Source: http://www.chacha.com/question/how-long-ago-did-the-hadean%2C-arc...
Because there isn't really much to divide them by. Not a lot happens in these eons, and what did happen is almost impossible to accurately date, so there is little point subdividing them too much. Although some are divided a little, it's re...
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Source: http://answers.yahoo.com/question/index?qid=20111206171335AAgyNRu
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