Absolute dating radiometric dating
The fossils which are buried deep inside the earth are more ancient.
The timeline established by the theory of Darwinian evolution ultimately determines the age of fossils found in any given strata.Relative dating is based on super imposition and fossils.In relative dating, fossils are dated according to the depth at which they were buried.The law of superimposition that the oldest fossils are found on the bottom is superseded by the law of decent with modification that the simplest fossils are the oldest and the youngest fossils are the most complex.This is the basis of relative dating Fossils Out of Sequence Palaios June 1990 page 227 "We define stratigraphic disorder as the departure from perfect chronological order of fossils in a stratigraphic sequence, in which an older fossils occurs above a younger one. stratigraphic disorder at some scale is probably a common feature of the fossil record.
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The calculation are based on the percentages of parent, and daughter elements.