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您的检索式：作者名="Christopher K.BEARD"
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| 1 | Early Paleogene stratigraphic sequences,mammalian evolution and its response to environmental changes in Erlian Basin,Inner Mongolia,China显示文摘Paleogene strata in the Huheboerhe area,Erlian Basin,Inner Mongolia,China have been subdivided into three lithological units:the Nomogen Formation,the Arshanto Formation,and the Irdin Manha Formation.At least 12 mammal-bearing horizons have been recognized in these formations,of which 4 in the Nomogen Formation,6 in the Arshanto Formation,and 2 in the Irdin Manha Formation.Recent investigation proved that the 'Houldjin Formation' recognized in this area by the Central Asiatic Expeditions(CAE) of the American Museum Natural History in the 1920s is actually the Irdin Manha Formation,while the 'Irdin Manha Formation' of CAE is the Arshanto Formation.A recent paleomagnetic study suggests that the upper part of the Nomogen Formation is early Eocene in age and the Arshanto Formation is mainly early Eocene rather than middle Eocene as previously thought.The Gashatan,Bumbanian,and Arshantan land mammal ages are correlated respectively to the Thanetian,the early Ypresian,and the middle Ypresian through earliest Lutetian of the Geological Time Scale.These land mammal ages are also correlated with the late Tiffanian through Clarkforkian,the early Wasatchian,and the middle-late Wasatchian and most of the Bridgerian of the North American Land Mammal Ages.During the early Paleogene,the mammalian history of the Erlian Basin was dominated by the appearance of new mammalian families and the replacement of a variety of genera and species,corresponding to the gradual climatic changes during this time period.The abrupt emergence of several modern mammalian orders at the beginning of the Eocene is probably related to extreme climatic warming in relation to the Paleocene-Eocene Thermal Maximum. | Christopher K.BEARD Daniel L.GEBO | 2010 | Science China Earth Sciences2010，53，12： | 15 |
| 2 | 内蒙古二连地区古近纪早期地层序列、哺乳动物演化及其环境响应显示文摘内蒙古二连盆地呼和勃尔和地区古近系包括3个组:脑木根组、阿山头组和伊尔丁曼哈组,从中可以划分出12个含哺乳动物化石的层位,其中脑木根组4个,阿山头组6个,伊尔丁曼哈组2个.研究表明,美国中亚考察团在这一地区划分的'呼尔井组'实际上是伊尔丁曼哈组,而'伊尔丁曼哈组'则为阿山头组.根据最新的古地磁资料,对相关组的时代和哺乳动物分期的延续时间进行了重新厘定,指出脑木根组上部包含了早始新世地层,阿山头组绝大部分属于早始新世,而不是过去认为的中始新世.将格沙头期、伯姆巴期和阿山头期分别与国际地质年表的坦尼特期、伊普里斯期早期和伊普里斯期中晚期至鲁帝特期最早期相对比,同时认为它们分别与北美古近纪提法尼期晚期至克拉克福克期、华沙溪期早期和华沙溪期中晚期及勃里吉期大部相当.古近纪早期,哺乳动物群演替以新科出现和属种更替为主,与这一时期大多数情况下气候的逐渐变化相对应;而众多目一级现代哺乳动物类群在始新世之初的突然出现则很可能与发生在古新世-始新世之交的高温事件有关. | 王元青 孟津 Christopher K.BEARD 李茜 倪喜军 Daniel L.GEBO 白滨 金迅 李萍 | 2010 | 中国科学:地球科学2010，40，9： | 6 |
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