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Rare Natural Pearl Recovered from Australian Shell Midden

Wednesday, June 3, 2015

Australia oyster pearlNEW SOUTH WALES, AUSTRALIA—A 2,000-year-old natural marine pearl was discovered at the Brremangurey Rockshelter during excavations conducted by researchers from the University of Wollongong (UOW), the University of New England, and the Wunambal-Gaambera Aboriginal Corporation. Located on the north Kimberley coast of Western Australia, the Brremangurey Rockshelter was in use for 12,000 years. The nearly round pearl was found in a shell midden among large numbers of pearl oyster shells. “Pearls have not been recovered before from ancient sites in Australia. Since the find is unique, analysis could not damage or take samples from any portion of the pearl, so researchers from UOW developed a range of non-destructive analyses to gather more information,” Kat Szabó of UOW said in a press release. The pearl was dated through radiocarbon analysis of the surrounding shell midden material, and micro-computed tomography showed that the pearl was indeed naturally formed, and not a modern cultured pearl that worked its way into the deposit. “The analysis confirmed that it was a natural pearl that had grown inside a small pearl oyster for over a decade before the animal was harvested for eating,” explained Brent Koppel of UOW. To read about historical archaeology in Australia, go to "Final Resting Place of an Outlaw."

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