According to folklore the fleet that was dispatched to Japan for the second Mongol invasion of 1281 encountered a fierce typhoon at Takashima. Radiocarbon (
14C) ages of wooden anchors and planks excavated from the submerged site at Takashima were determined using accelerator mass spectrometry (AMS). The
14C ages are 745±20 BP for bamboo and 770±20 BP for wood from the intact wooden anchor, and 840±20/865±20 BP for the planks, respectively. The calibrated bamboo age of 1268-1284 cal AD and the slightly older age of 1257-1279 cal AD for wood suggest that the wooden anchor was manufactured just before the invasion. The age range of planks (1191-1236 and 1163-1215 cal AD) is consistent with an idea that they are likely to be derived from contemporaneous ships. The high-precision AMS
14C dating confirms that the wooden anchors and planks are remains of wrecked Mongolian warships that were involved in the second Mongol invasion.
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