A Brief History of Geologic Time
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A Brief History of Geologic Time
PBS Member Stations rely on viewers like you. To support your local station, go to http://to.pbs.org/DonateEons ↓ More info below ↓ By looking at the layers beneath our feet, geologists have been able to identify and describe crucial episodes in life’s history. These key events frame the chapters in the story of life on earth and the ...
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THE GEOLOGIC TIME SCALE The geologic time scale is a system used by scientists to describe and organize Earth’s 4.6 billion year history. It divides time into structured units and subunits, helping researchers trace major geological, biological, and climatic events through deep time. At the broadest level are the eons, the largest divisions of time. There are four formally defined eons: Hadean from Earth’s formation 4.6 billion years ago to about 4.0 billion years ago. Archean from 4.0 billion t
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