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Also, D/L concentration thresholds appear to occur as sudden decreases in the rate of racemization.
These effects restrict amino acid chronologies to materials with known environmental histories and/or relative intercomparisons with other dating methods.
This means that the amino acid can have two different configurations, "D" or "L" which are mirror images of each other.
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used to estimate the age of a specimen in paleobiology, molecular paleontology, archaeology, forensic science, taphonomy, sedimentary geology and other fields.
With a few important exceptions, living organisms keep all their amino acids in the "L" configuration.
When an organism dies, control over the configuration of the amino acids ceases, and the ratio of D to L moves from a value near 0 towards an equilibrium value near 1, a process called racemization.