Amino acid racemization dating is effective for fossil bones of more than fifty thousand dates?

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Several basic studies investigating bone 14C-dating such as a bone preparation technique using ultrafiltration for effective removing foreign materials, AMS-14C analysis by small carbon of 0.1 mg, and chemical analysis for each part from an individual were performed to promote this study.We attempted determining 14C and amino acid racemization dates for some bone samples of more than 50,000 BP, collected from a cave located in Arsanjan, southern Iran, but were not able to get data because of little organic remains in the bones. This result suggests that apply of the amino acid racemization dating is difficult for old, poorly-preserved bones like samples used in this study.