The earliest known life, mostly represented by shallow-water microbial mats called stromatolites, started in the Archean and remained simple prokaryotes ( ...

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The Archean Eon began about 4 billion years ago with the formation of Earth's crust and extended to the start of the Proterozoic Eon 2.5 billion ...

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Relatives of insects, crabs, and spiders, there were over 20,000 trilobite species that lived between the Cambrian and the end of the Paleozoic Era when they ...

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4,600 Beginning of the Earth based on data from meteorites. Archean Eon (From oldest rocks on earth to 2,500 million years ago). 3,800 Oldest ...

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The Archean eon, which preceded the Proterozoic eon, spanned about 1.5 billion years and is subdivided into four eras.

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They were found in Australia and date from 3.4 billion years ago. The Archaean Eon is marked mostly by the absence of fossil life, however.

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The Archean Eon is defined as the geological time period that spans from approximately 4000 million years ago (Ma) to 2500 Ma, characterized by the ...

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Early Earth populated by microscopic life. The Archean Eon occurs after the Hadean Eon, and before the Proterozoic Era.

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