Ancient humans in eastern North America hunted mammoths until the mammoth disappeared from the area around 13, 000 years ago. Recently, a fossil bone with an engraving that depicts a mammoth was found in an ancient settlement in eastern North America. This shows that the settlement was occupied at a time when mammoths lived in this area. The argument requires the assumption that ['the fossil on which the engraving was made was not a mammoth bone', 'when mammoths disappeared from eastern North America, there were no mammoths left anywhere in North America', 'there is no scientific way of dating when the engraving of the mammoth was made', 'the engraving was made during the time when the settlement was occupied']