Precambrian: Hadean and Archean Eon

Earth was very hostile to life before 4,300 to 4,200 Ma, and the conclusion is that before the Archean Eon, life as we know it would have been challenged by ...

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

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Evidence of primitive life exists early in the Archean, at about 3.7 Ga, so that life on Earth evolved shortly after the oldest known rocks or was introduced ( ...

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The Archean Eon (4 to 2.5 billion years ago). During the Archean Eon, methane droplets in the air shrouded the young Earth in a global haze.

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Life most likely started during the late Hadean or early Archean Eons. The earliest evidence of life is chemical signatures, microscopic ...

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The Eoarchean is the first era of the Archean Eon of the geologic record. It spans 431 million years, from the end of the Hadean Eon 4031 Mya to the start ...

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Archean life would have very short food chains, but contained a great diversity of chemical pathways. Life would have been limited to the water.

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