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.
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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An international team led by researchers from the National Museum of Natural Sciences (MNCN-CSIC) has identified a key mechanism that has shaped Earth's continents over billions of years. This mechanism is the deep re-lamination ...
Earth Sciences
May 5, 2026
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The history of Earth is written on the great tablets of tectonic plates. The motions of plates shaped land masses, formed oceans, and created the varied climates and habitats that set the stage for evolution and the diversity ...
Earth Sciences
Mar 19, 2026
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Scientists have long sought to explain a key mismatch in Earth's early history: oxygen-producing photosynthesis evolved hundreds of millions of years before atmospheric oxygen began to rise during the Great Oxidation Event. ...
Earth Sciences
Mar 19, 2026
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The rocks beneath our feet are leaving a hidden signature in the shells of marine snails along Australia's ancient coastline, according to new research led by Adelaide University scientists. A study published in Proceedings ...
Ecology
Mar 18, 2026
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Western Australian hydrothermal and magmatic deposits that formed several hundred kilometers apart more than two and half billion years ago share more commonalities than previously thought.
Earth Sciences
Feb 19, 2026
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Oxygen is a vital and constant presence on Earth today. But that hasn't always been the case. It wasn't until around 2.3 billion years ago that oxygen became a permanent fixture in the atmosphere, during a pivotal period ...
Evolution
Feb 6, 2026
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117
More than 3.5 billion years ago, the Earth was not the hospitable world we know today. The atmosphere lacked oxygen, the seas were acidic and rich in iron, and volcanic activity roared across a barren landscape. Yet, in this ...
Evolution
Jan 23, 2026
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