Divisions of Geologic Time

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Time- a limited period or interval, as between two successive events. Seconds Minutes Hours Days Years.
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Presentation transcript:

Divisions of Geologic Time

Geologic time (p. 591 / Back of the Text) The time of the physical formation and development of Earth Ranges from 4.6 billion years ago until the present day

Eons > Eras > Periods > Epochs Largest division of geologic time Precambrian Eon Subdivided into the Hadean, Archean, Proterozoic The fossil record suggests life started to develop in the Archean Phanerozoic The current eon Lots of fossil evidence

Eons > Eras > Periods > Epochs 10 000 000 - 100 000 000 years in duration Divisions of time are based on the appearance of different forms of life represented in the fossil record Ceno - recent Meso - middle Paleo - old Zoic - life

Eons > Eras > Periods > Epochs 10 000 000 year duration Sometimes named after the region in which characterisitic fossils from the time period were discovered Example: Edicaran Period named after Ediacara Hills in Austrailian

Eons > Eras > Periods > Epochs 100 000 - 10 000 years in duration Why are there Epochs represented in the Cenozoic Era, but any others?

Mass Extinction Events: Turn to page. 594

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