The Proterozoic is a Precambrian eon of geologic time extending from about 2.5 billion to 541 million years ago, bounded by the Archean–Proterozoic and Proterozoic–Phanerozoic transitions. It is formally subdivided into the Paleoproterozoic, Mesoproterozoic, and Neoproterozoic eras. The Proterozoic record is characterized by stabilization and growth of continental cratons, widespread deposition of platformal sedimentary sequences, major orogenic cycles, large-scale mantle and crustal differentiation, and multiple global glaciation events. Biologically and geochemically, it encompasses progressive atmospheric oxygenation, diversification of prokaryotic life, emergence and early radiation of eukaryotes, and appearance of the earliest macroscopic multicellular organisms.
Earth's oceans repeatedly lost oxygen and produced metal deposits during the planet's deepest ice ages. An international team of researchers analyzed manganese and other chemical signatures preserved in more than 27,000 ancient ...
Earth Sciences
5 hours ago
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Earth has a natural thermostat that has kept the planet habitable for more than 100 million years. Scientists have struggled to fully explain how it works, but new research identifies a missing link between phosphate availability ...
Earth Sciences
Jul 13, 2026
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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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About a billion years ago, Earth started to come into its own. It was past the awkwardness of its younger years full of growing pains and turmoil: comet strikes and slimy water, including the Great Oxidation Event that flipped ...
From the highest mountains to the deepest ocean, the driest desert to the lushest jungle, Earth displays a dazzling array of life-forms. And eukaryotes account for many of these life-forms, including nearly all of the multicellular ...
Cell & Microbiology
May 20, 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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Newly discovered fossils have given scientists their first real glimpse of when Earth made a crucial transition from plants and unrecognizably simple animals to the complex creatures that took over the world and would eventually ...
Evolution
Apr 4, 2026
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Some of the most ancient fossils collected to date were traced back to the Ediacaran period. This is the time interval ranging from around 635 to 541 million years ago, shortly before the time when scientists predict that ...
The Great Unconformity is a major gap in Earth's geologic record. The missing layer between Precambrian and Cambrian rocks represents a gap of around a billion years of history. Among much debate surrounding the cause of ...
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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