Abstract
The extent of racemisation for a range of amino acids for the total acid hydrolysate and free fractions, calibrated against radiocarbon dating, indicates that the foraminifer Marginopora vertebralis, found within ‘modern’ tidal flat sediments between Wardang Island and Goose Island, South Australia, is reworked from the underlying Late Pleistocene Glanville Formation. Analyses of amino acids in the total acid hydrolysate and free fractions in conjunction with the determination of absolute concentrations of amino acid residues in fossils, provides an elegant method for assessing the validity of amino acid racemisation dating, and in identifying reworked fossils.
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