ANT100Y1 Lecture Notes - Lecture 9: Volcanic Glass, Dendrochronology, Simpletech
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Ex. dates on gravestones, monuments, written documents. Ancient greeks from date of 1st olympics = 775 bce. Egypt, china in terms of successive dynasties. Ex. dynasties need to list all kings. Must be linked to a known date, or else it is relative. When fractured edge begins to absorb water. Hydration penetrates into the stone at a known rate can be measure. Each region has different rate of hydration. In temperate areas trees are dormant during winter. Leads to well-defined growth rings which vary by year. Reuse of old wood provides inaccurate dates date is of cutting of tree, not use. Need a regional chronology complex & time consuming. Looks at large-scale reversals of north-south polarity. Used only occasionally, to confirm other dating methods. A radiometric dating method, based on radioactive decay of isotopes. Isotopes different forms of an element with different atomic weights . Ie different numbers of protons & neutrons in the nucleus.
