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Coral Files Used by Early Polynesian Settlers

Caption: This shows pristine (upper) and used (lower) surfaces of an Acropora coral file used to sculpt and smooth wood and shell surfaces.

Credit: Citation: Burley D, Weisler MI, Zhao J-x (2012) High Precision U/Th Dating of First Polynesian Settlement. PLoS ONE 7(11): e48769. doi:10.1371/ journal.pone.0048769

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Related news release: Coral files reveal time of first Polynesian settlements