absolute time and geological time scale

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Geology

Last updated 2:09 PM on 9/13/23
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13 Terms

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present **era** 
Cenozoic
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present eon
Phanerozoic
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present period
Quaternary
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4 eons
Hadean

Archean

Proterozoic

Phanerozoic
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Phanerozoic eras
Paleozoic

Mesozoic

Cenozoic
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Cenozoic periods
Paleogene

Neogene

Quaternary
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divisions or geologic time
 eons, eras, periods, epochs
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James Hutton
first to introduce the idea of geological (or deep) time
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Atoms of AA decay to atoms of BB with a half-life of 100,000 years. If there are 20,000 atoms of AA to begin with (and 0 atoms of BB), how long will it take for there to be 2,500 atoms of AA?
300,000 years
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carbon-14
radioactive isotopes useful for dating young samples (<20,000 years) of organic materials (wood)
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Hadean
oldest eon
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radiometric dating
is the best way to estimate of Earth's actual age
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isotopes
atoms with the same atomic number but  different mass numbers