Dating oxalate minerals 20-45 ka

Alan Watchman, Susan O'Connor, Rhys Jones

    Research output: Contribution to journalArticle

    Abstract

    We report a test of the dating of oxalate minerals near the radiocarbon limit. Oxalate salts are used for estimating the ages of prehistoric rock paintings and carvings, but uncertainties have existed about the origin of the carbon they contain. Sediments at the Carpenter's Gap 1 rockshelter, Western Australia, have been conventionally radiocarbon dated at about 34000 years old, providing independent evaluation for the ages of buried oxalate crusts associated with them. Accelerator mass spectrometry radiocarbon (AMS14C) assays of carbon in rapidly oxidized oxalate ions from these crusts produce age estimates marginally older than the covering sediments.
    Original languageEnglish
    Pages (from-to)369-374
    JournalJournal of Archaeological Science
    Volume32
    Issue number3
    DOIs
    Publication statusPublished - 2005

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