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.
A study led by researchers from the University of Sydney and the University of Adelaide has revealed how the breakup of an ancient supercontinent 1.5 billion years ago transformed Earth's surface environments, paving the ...
Earth Sciences
Oct 28, 2025
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The explosion of animal life in Earth's oceans half a billion years ago during and after the Cambrian Period is commonly attributed to a substantial and sustained rise of free oxygen (O2) in seawater. Some researchers even ...
Earth Sciences
Sep 4, 2025
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Around 800 million years ago, during the Tonian period, the Yangtze Block in South China experienced significant tectonic activity, in which the ancient supercontinent Rodinia broke off from the area that is now South China. ...
The Cambrian Explosion is a landmark moment in the history of life on Earth when many of the major groups of animals first appear in the fossil record.
Paleontology & Fossils
Jul 10, 2025
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402
Scientists at the University of California, Berkeley, and Boise State University have found evidence suggesting that the Marinoan glaciation began approximately 639 million years ago and lasted for approximately 4 million ...
