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![Page 1: GEOLOGIC TIME SCALE - WordPress.com€¦ · Organizing Geologic Time Geologic Time Scale - series of time intervals that record Earth’s history from its origin 4.6 billion years](https://reader030.vdocument.in/reader030/viewer/2022040108/5edccb7aad6a402d66679e7c/html5/thumbnails/1.jpg)
GEOLOGIC TIME SCALE
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Organizing Geologic TimeGeologic Time Scale - series of time intervals that record Earth’s history from its origin 4.6 billion years ago (bya) to present
Intervals are divided using significant events and fossils
Enables scientists to find relationships among geological events, environmental conditions, and fossilized life forms
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EonEon - largest interval of geologic time - half a billion years or more
4 Eons - Hadean, Archean, Proterozoic, and Phanerozoic
First 3 eons make up ~90% of geologic time - known together as the Precambrian
Eons are made up of eras
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EraEra - tens to hundreds of millions of years in duration
Defined by different life forms found in rocks
Named based on relative ages of life forms
Paleo - old, meso - middle, ceno - recent
3 Eras - Paleozoic, Mesozoic, Cenozoic
Eras are divided into periods
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PeriodPeriod - tens of millions of years in duration
Named for geographic region where rocks/fossils were first observed and described
Periods are divided into epochs
Paleozoic and Mesozoic Periods
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EpochEpoch - hundreds of thousands to millions of years in duration
All periods of time are divide into epochs - not all shown on scale
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Currently We Are In...
Eon - Phanerozoic
Era - Cenozoic
Period - Quaternary
Epoch - Holocene
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Geologic Time Scale