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SlideshowReport

The Geologic Time Scale

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Description
Divides geologic history into units
Originally created using relative dates
Subdivisions
Eon
Greatest expanse of time
Four eons
Phanerozoic (“visible life”) – the most recent eon
Proterozoic

Subdivisions
Eon
Four eons
Archean
Hadean – the oldest eon
Era
Subdivision of an eon

Subdivisions
Era
Eras of the Phanerozoic eon
Cenozoic (“recent life”)
Mesozoic (“middle life”)
Paleozoic (“ancient life”)
Eras are subdivided into periods
Periods are subdivided into epochs
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