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Amino acid dating

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Chiral molecules are not superimposable on their mirror image.

All but the simplest protein amino acid can exist in either a ‘left-’ or ‘right-’ handed configuration.

amino acid dating-72amino acid dating-22

Uncertainty as to the extent to which modern organisms represent in detail the characteristics of their ancient counterparts introduces additional lack of precision in a fossil age based on amino acid ratios.

Temperature and humidity histories of microenvironments are being produced at ever increasing rates as technologies advance and technologists accumulate data.

These are important to amino acid dating because racemization occurs much faster in warm, wet conditions compared to cold, dry conditions.

In spite of these complications, fossils of similar characteristics, and which have experienced similar conditions of preservation, can be placed in a relative age sequence on the basis of D/L ratios.

Due to the strong dependency of racemization rates on temperature, water concentration, and alkalinity, uncertainties regarding conditions of preservation can leave amino-acid-based age relationships among even similar fossils open to question.