Comparison of 14C and luminescence chronologies at Puritjarra rock shelter, central Australia

M. A. Smith, J. R. Prescott, M. J. Head

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

At Puritjarra rock shelter a long comparative sequence permits detailed comparisons of luminescence and radiocarbon chronologies over 35,000 years. Both techniques produce self-consistent chronologies for the Puritjarra deposit, but observed discrepancies between luminescence date on unburnt sediments and 14C assays on charcoal are greater than reported elsewhere. TL ages dates are generally older than 14C ages but dates converge at depths below 70 cm, dating first significant human occupation of the rock shelter ~35,000 years ago. The discrepancies are not removed by calibrating 14C dates or adjusting TL ages for lower water content of sediments. The 14C chronology is broadly supported by sedimentary or palaeobotanical evidence, stone artefact typology and other archaeological data. Radiocarbon dates on intact hearts agree with those on detrital charcoal. TL ages were arrived at using both 'total bleach' and 'selective bleach' methods and the latter agree with optical ages for the same samples. Incomplete bleaching of sediments during deposition can be ruled out. Incorporation of old material into the luminescence sample via in-situ disintegration of local sandstone remains a possibility and will be an important issue to resolve as luminescence techniques are increasingly deployed to date archaeological deposits in rock shelters.

Original languageEnglish
Pages (from-to)299-320
Number of pages22
JournalQuaternary Science Reviews
Volume16
Issue number3-5
DOIs
Publication statusPublished - 1997
Externally publishedYes

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