Precambrian period

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Noun1.Precambrian period - the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
Precambrian, Precambrian aeon, Precambrian eon
Proterozoic, Proterozoic aeon, Proterozoic eon - from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
Archaeozoic, Archaeozoic aeon, Archean, Archean aeon, Archean eon, Archeozoic, Archeozoic eon - the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
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References in periodicals archive
Professor Rachel Wood, Professor of Carbonate GeoScience at the University of Edinburgh said that they have found that animals were building reefs even before the evolution of complex animal life, suggesting that there must have been selective pressures in the Precambrian Period that are yet to be understood.
How one of Earth's oldest reefs was formed 550m yrs ago
We have found that animals were building reefs even before the evolution of complex animal life, suggesting that there must have been selective pressures in the Precambrian Period that we have yet to understand," Professor Rachel Wood, Professor of Carbonate GeoScience at the University of Edinburgh, who led the study, said.
Animals Built Reefs 550 Million Years Ago
How It All Began: The Precambrian Period (4,500,000,000-543,000,000 years ago).
Our ever Evolving Planet
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