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Geologic Time Scale

Geologic Time Scale

When paleontologists want to know the age of a fossil, they use the geological time scale (GTS) to help date the fossil. GTS is made up of Eras, Periods, and Epochs. This time scale moves from the earliest (oldest) life forms on earth all the way up to today!

2022年9月18日

Geological Time Scale

Geological Time Scale Explained | Eons, Eras, Periods & Epochs | With Trick

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Geologic Time Scale

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Major Mass Extinctions

Earth’s five mass extinctions

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Earth’s history includes five major mass extinctions, with up to 95% of species lost in events driven by impacts, volcanic eruptions, or potentially solar outbursts. The terminal Pleistocene extinction, though not part of the “Great Five,” saw the disappearance of North America’s megafauna, focusing on top predators and large mammals. | The Randall Carlson

Earth’s history includes five major mass extinctions, with up to 95% of species lost in events driven by impacts, volcanic eruptions, or potentially solar outbursts. The terminal Pleistocene extinction, though not part of the “Great Five,” saw the disappearance of North America’s megafauna, focusing on top predators and large mammals. | The Randall Carlson

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Geologic Time Scale

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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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