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Bookmark or Share- Geologic Time Scale: Eons, Eras, and Periods - ThoughtCoThe geologic time scale is a system used by scientists to describe Earth's history in terms of major geological or paleontological events (such as the formation of a new rock layer or the appearance or demise of certain lifeforms). Geologic time spans are divided into units and subunits, the largest of which are eons.
- Geologic time | Periods, Time Scale, & Facts | BritannicaThe geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration— eons, eras, periods, epochs, and ages.
- PBS Eons - YouTubeJoin hosts Kallie Moore, Michelle Barboza-Ramirez and Blake de Pastino as they take you on a journey through the history of life on Earth. From the dawn of life in the Archaean Eon through the ...
- Eon Definition & Meaning - Merriam-WebsterSpelling Bee Quiz Can you outdo past winners of the National Spelli... Take the quiz. The meaning of EON is an immeasurably or indefinitely long period of time : age. How to use eon in a sentence.
- Geologic time scale - WikipediaThere are four formally defined eons: the Hadean, Archean, Proterozoic and Phanerozoic. An era is the second largest geochronologic time unit and is equivalent to a chronostratigraphic erathem.
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