12-5 Notes - Anthro 2 Reading: Ashmore + Sharer Chap 8...

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Unformatted text preview: Anthro 2 Reading: Ashmore + Sharer Chap 8 12/5/08 X. ANALYSIS XI. 7. Chronology dendrochronology. F. Obsidian Hydration; Measure Hydration Layer. obsidian source- longer exposed, thicker the layer. thicker= older Best as Relative Dating Method; Attempts to Use as Absolute Dating Method- use obsidian and try to time the time of hydration- try and find out the rate they hydrate and relate it to dates- still very experimental; Some Problems G. C-14 or Radiocarbon Age Determination most popular/common dating method-radiocarbon method- you can date organic material in archaeological context. if you find seeds, bones, textiles, any organic thing- can be dated with this method. based on C-14. Radio carbon dating is a radioactive isotope of carbon. All living organism take in C-14. and when die it becomes N-14. Radiometric Dating Technique; C-14 to N-14- decays at a fairly constant rate of time. began to calculate how long it takes to decay into N-14. called = Half-Life Unit- period of time required of 1/2 of unstable C-how long it takes to decay into N-14....
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