Abstract
Quite often ESR dating of tooth enamel provides underestimated ages. The factors, which may account for the age suppression are studied. For dating of the samples of Early Pleistocene, thermal fading of the g=2.0018 signal during the burial time may also lead toage underestimation. Isothermal annealing of the g=2.0018 line was studied in this work and a mixed first- and second-order kinetics was observed. Its implication to the practical dating purpose is discussed. It is suggested that if no uranium leakage is detected, ESR EU ages of Early Pleistocene enamel samples should be considered only as the lower limits of the true ages. Combined ESR and magnetic dating of the Longgupo profile, Wushan, China, assigns the Olduvai subchron to the fossil hominid-bearing layers of 7–8 of this profile.
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