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Chapter 4

ANTH 1210 Chapter 4: Topic 44

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ANTH 1210
Haskel J.Greenfield

Oc78 PotassiumArgon Dating KAr similar to C14 dating K40 decays to Ar40 at a known rate Half life of 1.3 billion years A40 gas, K40 solid K40 present in earths mantle Over time, decays into Ar40 Rises to surface with volcanic activity lave Result Ar40 floats into atmosphere, only K40 left As lava cools, K40 continues to decay A40 trapped in newly cooled rock Measure amount of rock to date lava ration of Ar to K Resets clock Measuring moment since cooling of rock Useful on volcanic rock Date indirectly layers between Half life 1.3 billion years Useful from 300000 several billion years Chronology Study of Time 3 ways of measuring time 1) biological history of life (era) 2) geological rock strata 3) culturalarchaeologists o (technology) Biological history of life divided into eras, dominated by different group of organisms o animals and plate
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