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The Proterozoic Era

https://ucmp.berkeley.edu/precambrian/proterozoic.html

“The period of Earth's history that began 2.5 billion years ago and ended 543 million years ago is known as the Proterozoic. Many of the most exciting events in the history of the Earth and of life occurred during the Proterozoic -- stable continents first appeared and began to accrete, a long...” (from the page’s text)

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