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Exclusion of these heated samples from AAR age models significantly increases the age resolution.
Analysis of several amino acid chiral pairs allowed age resolution over the full time range studied (~0.3 ka – 151 ka), allowing differentiation of MIS 1, 2, 3/4, 5 and 6.
Nonetheless, hydrolysis and racemization have been shown to follow predictable patterns of diagenesis, and are therefore useful for the application of relative dating in AAR geochronology.
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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.
As a rule of thumb, sites with a mean annual temperature of 30°C have a maximum range of 200 ka Template: Kilo annum; thousand years and resolution of about 10 ka; sites at 10°C have a maximum age range of ~2 m.y.