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Proterozoic

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Proterozoic

[¦präd·ə·rə¦zō·ik]
(geology)
Geologic time between the Archean and Paleozoic eras, that is, from 2500 million to 550 million years ago. Also known as Algonkian.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The project, part of the International Continental Scientific Drilling Program, drilled a series of shallow, two-inch diameter cores and, by overlapping them, created a record representing stone deposited during the Proterozoic Eon (2,500 million to 542 million years ago).
Earth's oxygen came in long series of 'starts and stops'
Major changes in the isotopic ratios of sulfur indicate that oxygen first became an important atmospheric constituent around 2.45 billion years ago, soon after the Proterozoic Eon began 2.5 billion years ago.
Glimpses of an evolving planet: a stroll through Earth's past gives astronomers vital clues of what to expect when they start finding terrestrial-size exoplanets
"The Proterozoic Eon saw two major events of oxygen build-up in the atmosphere and the oceans," El Albani explained.
Study pushes back dawn of multicellular life on Earth
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