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It is used for human and animal bone and other organic material.Specific changes in its amino acid structure (racemization or epimerization) which occur at a slow, relatively uniform rate, are measured after the organism's death.These break down over time in a process scientists call radioactive decay.Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.The earliest-known hominids in East Africa are often found in very specific stratigraphic contexts that have implications for their relative dating.Geologists often need to know the age of material that they find.These use radioactive minerals in rocks as geological clocks.The atoms of some chemical elements have different forms, called isotopes.

This is different to relative dating, which only puts geological events in time Most absolute dates for rocks are obtained with radiometric methods.

If archaeologists know how pottery styles, glazes, and techniques have changed over time they can date sites based on the ratio of different kinds of pottery.

This also works with stone tools which are found abundantly at different sites and across long periods of time.

The basis for the technique is the fact that almost all amino acids change from optically active to optically passive compounds (racemize) over a period of time.

Aspartic acid is the compound most often used because it has a of 15,000-20,000 years and allows dates from 5,000-100,000 years to be calculated.

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