Amino acid racemisation dating
This amino acid ratio has the advantages of being relatively easy to measure and being chronologically useful through the Quaternary.Reverse phase HPLC techniques can measure up to 9 amino acids useful in geochronology over different time scales on a single chromatogram (aspartic acid, glutamic acid, serine, alanine, arginine, tyrosine, valine, phenylalanine, leucine).The 'filling in' of large probability ranges, such as with radiocarbon reservoir effects, has sometimes been possible.
Also, D/L concentration thresholds appear to occur as sudden decreases in the rate of racemization.
stratigraphy, oceanography, paleogeography, paleobiology, and paleoclimatology have been particularly affected.
Their applications include dating correlation, relative dating, sedimentation rate analysis, sediment transport studies, Paleobiology and archaeology have also been strongly affected.
These are important for amino acid dating because racemization occurs much faster in warm, wet conditions compared to cold, dry conditions.
Temperate to cold region studies are much more common than tropical studies, and the steady cold of the ocean floor or the dry interior of bones and shells have contributed most to the accumulation of racemization dating data.