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Line 45:
Line 45: − − Many methods of cross-verification exist. − Examples; − − 1. Eruption of Mt. TOBA dated to 70000 BC via radiometric dating matches ash layer in ice dated by the depth at which ash was found which also corelates to a genetic bottle neck found in human DNA which dates to around 70000BC via genetic drift. − − 2. Independent radiometric dating methods may be used to cross-check each other; K-Ar can be used to verify the result from U-Th to ensure Parent-Daughter assumptions were correct.
→Calibration: Remove two points; see talk shortly.
== Calibration ==
== Calibration ==
In order to calibrate radiometric dating methods, the methods need to be checked for accuracy against items with independently-known dates.
In order to calibrate radiometric dating methods, the methods need to be checked for accuracy against items with independently-known dates.
Carbon dating, with it's much lower maximum theoretical range, is often used for dating items only hundreds and thousands of years old, so can be calibrated in its lower ranges by comparing results with artifacts who's ages are known from historical records.
Carbon dating, with it's much lower maximum theoretical range, is often used for dating items only hundreds and thousands of years old, so can be calibrated in its lower ranges by comparing results with artifacts who's ages are known from historical records.