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Deeper layers of organically rich sediment from the lake are too old to carbon-date, which indicates that those strata are at least 50,000 years old.
Researcher Mary Lardie flame-seals a tube, preparing to carbon-date a wood sample from the pirate Blackbeard's flagship, Queen Anne's Revenge, at the National Ocean Sciences Accelerator Mass Spectrometry Facility at WHOI.
Professor Gordon Cook of Edinburgh University was able to carbon-date the skull despite the murderer having boiled it after cutting up the victim.
Now experts plan to carbon-date the bones, believed to be either Roman or Iron Age.
Dr Euan MacKie, former senior curator of prehistoric archaeology at the museum, said: "We would have to take a small bone sample and then carbon-date it.