Mammoth and musk ox ESR-dated to the Early Midlandian at Aghnadarragh, County Antrim, Northern Ireland, and the age of the Fermanagh Stadial
Mammoth and musk ox ESR-dated to the Early Midlandian at Aghnadarragh, County Antrim, Northern Ireland, and the age of the Fermanagh Stadial
复制标题
猛犸象和麝牛 ESR——可追溯到北爱尔兰安特里姆郡阿格纳达拉赫的早期米德兰时代，以及弗马纳体育场的时代
DOI：
10.1002/gj.2668
复制
发表时间：
2015
影响因子：
1.8
通讯作者：
Lister A
中科院分区：
文献类型：
--
作者：
Lister A
Aghnadarrah遗址展示了爱尔兰已知最完整的米德兰阶（最后一个寒冷期）层序。在冰川冰碛之上和阿格纳达拉赫间冰丘的有机沉积层之下，一个分选不良的砾石和杂岩单元产出了大量的长毛猛犸化石和更罕见的麝牛化石，这是爱尔兰对该物种的首次记录。猛犸的臼齿相对较小，其独特的形态可能与当地的环境条件有关。通过电子自旋共振对三个猛犸臼齿的测年表明，动物群的年龄范围在109 - 74 ka之间，对应于MIS 5的后期，鉴于适应寒冷的植物群和动物群，可能是MIS 5d或5 b，或者可能是MIS 4的早期。这反过来又表明，弗马纳体育场的底层冰川沉积物是在最后一次间冰期之前的寒冷阶段形成的，而不是通常认为的米德兰早期。版权所有© 2015约翰威利父子有限公司.
The Aghnadarragh site presents the most complete known Midlandian (last cold stage) sequence in Ireland. Above a glacial till and below organic deposits of the Aghnadarragh Interstadial, a unit of poorly sorted gravel and diamicton yielded numerous fossils of woolly mammoth and rarer musk ox, the first record of that species in Ireland. The mammoth molars are of relatively small size and distinctive morphology that probably relate to local environmental conditions. Dating of three mammoth molars by Electron‐Spin‐Resonance indicates an age for the faunal horizon in the range 109 to 74 ka, corresponding to the later part of MIS 5, presumably MIS 5d or 5b in view of the cold‐adapted flora and fauna, or possibly early MIS 4. This in turn suggests that the underlying glacigenic deposits, assigned to the Fermanagh Stadial, formed during a cold stage preceding the last interglacial, rather than being early Midlandian in age as generally assumed. Copyright © 2015 John Wiley & Sons, Ltd.