| american mastodon extirpation in the arctic and subarctic predates human colonization and terminal pleistocene climate change. | existing radiocarbon ((14)c) dates on american mastodon (mammut americanum) fossils from eastern beringia (alaska and yukon) have been interpreted as evidence they inhabited the arctic and subarctic during pleistocene full-glacial times (∼ 18,000 (14)c years b.p.). however, this chronology is inconsistent with inferred habitat preferences of mastodons and correlative paleoecological evidence. to establish a last appearance date (lad) for m. americanum regionally, we obtained 53 new (14)c dates o ... | 2014 | 25453065 |