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If during K-Ar analyses these detrital grains are not recognized and eliminated then they can cause the measured ages to be systematically too old.
Such numerical calibrations are crucial to understanding rates and timing of evolutionary change.
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Relative dating methods allow one to determine if an object is earlier than, later than, or contemporary with some other object.
Stratigraphic dating is based on the principle of depositional superposition of layers of sediments called strata.
This principle presumes that the oldest layer of a stratigraphic sequence will be on the bottom and the most recent, or youngest, will be on the top.