Process of absolute dating
( New Scientist Nov 10 1983 page 425 Both absolute dating and relative dating are determined by the evolutionary timeline and are used to support the evolutionary timeline.
( The rocks do not date the fossils the fossils date the rocks American Journal of Science Jan 1976 47-55) Absolute dating is based on radioactivity.
This means that absolute dating is basically the same as relative dating as it is based on the law of superimposition the most recent rocks are higher in the geological column.
Half time is the time needed for half of a given quantity of an isotope to decay in its byproducts.The probability of a parent atom decaying in a fixed period of time is always the same for all atoms of that type regardless of temperature, pressure, or chemical conditions. The time required for one-half of any original number of parent atoms to decay is the half-life, which is related to the decay constant by a simple mathematical formula.All rocks and minerals contain long-lived radioactive elements that were incorporated into Earth when the Solar System formed.The calculation are based on the percentages of parent, and daughter elements.These calculations are based on geological assumptions of uniform process, the lack of erosion of either the parent or daughter elements.