Racemization dating definition
The intra-crystalline fraction within ostrich eggshell, but also in the Mediterranean rim, i.e. At a widely publicized news conference in August of 1972, Dr.Jeffrey Bada of Scripps Institute of Oceanography announced the "discovery" of a new dating method based on the rate of racemization of amino acids in fossil material.The D/L value yields an estimate of the time elapsed since the death of the organism: older fossils will have higher D/L values (closer to 1) (see Fig. However, for the use of amino acid racemisation (AAR) as a reliable dating tool, analysis of proteins from a closed system within fossils is vital. Dating Pleistocene archaeological sites by protein diagenesis in ostrich eggshell. This is achieved by chemical isolation of a fraction of proteins (intracrystalline) which behave as a closed system during diagenesis.
famous cave sites such as those in Southern Spain, Italy and Libya, and the early modern human sites at Pinnacle Point, South Africa (details on the Pinnacle Point project).