Brian Frederick Windley
Contributor
Professor of Geology, University of Leicester, England. Author of The Evolving Continents.
Primary Contributions (10)
Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, 541 million years ago. The Precambrian encompasses the Archean and Proterozoic eons, which are formal geologic intervals that lasted from 4β¦
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