The Archaean is a geologic eon of Earth history spanning approximately 4.0 to 2.5 billion years ago, following the Hadean and preceding the Proterozoic. It is characterized by high heat flow, a largely anoxic atmosphere, and the stabilization of the first substantial continental crust, dominated by granite–greenstone terranes and high-grade gneiss complexes. Plate tectonic processes were likely more vigorous due to higher mantle temperatures, influencing crustal growth and metamorphism. The Archaean also encompasses the earliest widely accepted evidence of life, primarily prokaryotic microorganisms, preserved in stromatolites and microfossils, which played a foundational role in shaping subsequent biospheric and geochemical evolution.
Geologists studying some of the planet's oldest volcanic rocks have uncovered new evidence that water was playing a major role in shaping Earth's interior and driving volcanic activity more than 3 billion years ago.
Earth Sciences
Jul 7, 2026
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In the Pilbara of Western Australia, some of Earth's oldest rocks lie beneath the sky, as they have for billions of years. They are dark, weathered volcanic rocks, close to 3.5 billion years old, cut by veins and stewed by ...
Earth Sciences
Jun 24, 2026
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Curtin University researchers have determined the most precise age yet for the oldest known impact crater on Earth, providing new insight into how meteorite strikes shaped the planet during its earliest history.
Earth Sciences
Jun 23, 2026
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Caltech researchers have identified a novel chemical reaction that could explain the formation of the building blocks of DNA and RNA, the molecules that encode all of life's functions. The work is an important step toward ...
Astrobiology
Jun 15, 2026
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The first few billion years of Earth's history saw the rise of life, the atmosphere and the oceans. Still, that time is shrouded in mystery: Not many rocks remain that preserve a record of those early iterations of our modern ...
Earth Sciences
Jun 9, 2026
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Asteroids and planetesimals regularly bombarded Earth between about 4.6 billion and 3.5 billion years ago, during the Hadean and Archean eons. Because few rocks today are more than 4 billion years old, our understanding of ...
Astrobiology
Jun 8, 2026
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37
A new study published in Precambrian Research by Jawad Shabbir, a Ph.D. student at Peking University's School of Earth and Space Sciences under Professor Song Shuguang, addresses a critical yet poorly understood period in ...
Earth Sciences
Jun 8, 2026
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Scientists have uncovered new evidence that Earth's continents are continuously reworked deep beneath the surface, offering fresh insight into how continents have evolved over billions of years.
Earth Sciences
May 20, 2026
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An international team of researchers' analysis of minerals from the Pilbara region of Western Australia has given new insight into how ancient continents on Earth formed as far back as 3.5 billion years ago. Professor Tony ...
Earth Sciences
May 11, 2026
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Earth's earliest continents may have set the chemical stage for life by regulating boron levels in ancient oceans, a new study in Terra Nova suggests.
Astrobiology
May 6, 2026
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