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Unformatted text preview: 21-march-2011Absolute dating- dating an object to get the most accurate ageGives you a numberingDendrochronologyDating of past events using tree ring growthDates up to 9000 years old Used to recalibrate c14 datesCool dry years equal thin tree ringCarbon 14 datingUsed to date organic remainsC14 half-life: 5730 yearsUp to 50-60 thousand yearsCheapMany things are datableLimitations: 1.Things you date have to have once been alive2.Cannot date fossilsMethod1.Carbon produced in atmosphere2.Oxidized and forms carbon dioxide3.Incorporates into plant tissues4.Absorbed by oceans5.Animals eat plants and it is absorbed into bone and tissues21-march-20116.When animals die carbon begins to decay b/c they arent breathing and taking in new carbon from plants and water. Decay rate from half-life is how we date.Potassium Argon (K/ar) dating1.Half-life: 1.3 billion years2.Finds date that piece of rock was reset by heating3.Hominid fossils in Africa4.Useful in volcanic regions like Africa...
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- Spring '08