The Archean in older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth's history, preceded by the Hadean Eon and ...

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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 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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by DC Catling · 2020 · Cited by 518 — The atmosphere of the Archean eon—one-third of Earth's history—is important for understanding the evolution of our planet and Earth-like ...

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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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The Archean Eon (4.031-2.5 Ga) is the oldest terrestrial rocks, with little free oxygen, and is divided into sub-eras. Its record is poor due ...

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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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It was early in the Archean that life first appeared on Earth. Our oldest fossils date to roughly 3.5 billion years ago, and consist of bacteria microfossils.

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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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by DC Catling · 2020 · Cited by 518 — The atmosphere of the Archean eon—one-third of Earth's history—is important for understanding the evolution of our planet and Earth-like ...

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