Abstract
Mud-nesting wasps are found in all of the main biogeographical regions of the world1,2,3, and construct nests that become petrified after abandonment. Nests built by mud-dauber and potter wasps in rock shelters in northern Australia1,4 often overlie, and occasionally underlie, prehistoric rock paintings. Mud nests contain pollen, spores and phytoliths from which information about local palaeovegetation can be gleaned. Here we report a new application of optical dating5,6,7, using optically stimulated luminescence (OSL), and accelerator mass spectrometry (AMS) 14C dating of pollen8 to determine the ages of mud-wasp nests associated with rock paintings in the Kimberley region of Western Australia9,10. Optical dating of quartz sand (including the analysis of individual grains) embedded in the mud of fossilized nests shows that some anthropomorphic paintings are more than 17,000 years old. Reconstructions of past local environments are also possible from the range of pollen and phytolith types identified. This approach should have widespread application to studies of rock-art dating and late Quaternary environmental change on continents where mud-wasps once lived and other sources of palaeoecological information are absent.
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Acknowledgements
We thank the traditional Aboriginal custodians (M. Pandilow, T. H. Unghango and family members, L. Utemara and D. Utemara, L. Karedada, J. Karedada and S. Mangolamara), Kalumburu Community Council and A. Koeyers for permission to undertake this study. Samples were collected under permits 166 and NE001023 from the Western Australian Aboriginal Affairs Department and Department of Conservation and Land Management, respectively. We thank D. Questiaux for preparing and E. Haskell for analysing the thermoluminescence dosimetry capsules; M. Shelley for preparing and L. Kinsley for measuring the laser-ablation ICP-MS samples; K. Weiss and G. Atkin for pollen extraction; G. Jacobsen for 14C sample preparation; M. J. Olley for X-ray fluorescence analyses; and A. Bell and M. Aitken for comments. R.R. acknowledges the support of a Queen Elizabeth II fellowship from the Australian Research Council and a J. G. Russell Award from the Australian Academy of Science, which funded some of the research costs. The Bradshaw Foundation, Australian National University and Australian Research Council funded the fieldwork, and the Australian Institute of Nuclear Science and Engineering funded the AMS 14C determinations.
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Roberts, R., Walsh, G., Murray, A. et al. Luminescence dating of rock art and past environments using mud-wasp nests in northern Australia. Nature 387, 696–699 (1997). https://doi.org/10.1038/42690
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DOI: https://doi.org/10.1038/42690
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