30 Aug 2025 — 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 saw Earth cool, forming oceans and continents. Oxygen filled the atmosphere, and the first continents formed. The first life emerged.

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25 Aug 2025 — The Archean Eon, which lasted from 4.0–2.5 billion years ago, is named after the Greek word for beginning. This eon represents the beginning of the rock record.

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The Late Heavy Bombardment is hypothesized to overlap with the beginning of the Archean. The oldest known glaciation occurred in the middle of the eon. Archean.

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The Archean Eon, from 4000 to 2500 million years ago, saw the formation of early rocks and significant geological processes, with the Earth cooling and crust ...

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16 Jan 2025 — Late Archean Events. Stromatolites become more common, indicating diversity of photosynthesizers increasing; Oxygen production increases ...

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The most significant event was the formation and stabilisation of the first pieces of continental crust, or protocontinents. Earth's interior was hotter, ...

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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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During the Archean Eon, methane droplets in the air shrouded the young Earth in a global haze. There was no oxygen gas on Earth.

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