Ribs of Dugong, discovered at Shea's Creek, showing Cuts made by Aborigines with Stone Tomahawks 1896

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(Detail of Plate XI, 'On the occurrence of a submerged forest, with remains of the Dugong, at Shea's Creek near Sydney' by R Etheridge, Junr, Professor TW Edgeworth David, BA, FGS, and HW Grimshaw, M Inst CE, Journal and proceedings of the Royal Society of New South Wales, Vol 30, 1896, p 158)