The chronology given in this comment depends primarily on thermoluminescence and optical ages obtained for several samples. I present, in this comment, evidence that the samples dated are considerably older than the ages presented. The optical ages quoted in the article were obtained from data from my laboratory, but the presentation was incomplete. The authors have chosen not to include the information that severe anomalous fading was observed for the two samples for which measurements were made, and the optical ages should consequently have been presented as lower limits.

In either thermoluminescence dating or optical dating, one measures the luminescence...

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