| Radiometric Dating of Ignimbrite from Inner Mongolia Provides no Indication of a Post-Middle Jurassic Age for the Daohugou Beds |
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| 作者姓名： | GAO Ke-Qin REN Dong |
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| 作者单位： | [1]School of Earth and Space Sciences, Peking University, Beijing 100871 [2]College of Life Science, Capital Normal University, Beijing 100037 |
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| 摘 要： | 1 Introduction and Background Along with stunning paleontological discoveries from the world-renowned fossil beds in western Liaoning Province of China, recent findings from the lacustrine deposits exposed at the Daohugou village (Fig. 1) near Ningcheng, Inner Mongolia, include superbly preserved pterosaur, salamander, insect, and plant fossils (Ji and Yuan, 2002; Wang et al., 2002; Gao and Shubin, 2003; Zheng et al., 2003; Rasnitsyn and Zhang, 2004). The Daohugou fossil beds consist of…
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| 关 键 词： | 内蒙古 侏罗纪 熔灰岩 化石 地层学 |
| 收稿时间： | 9/8/2005 12:00:00 AM |
| 修稿时间： | 2005-11-25 |
Radiometric Dating of Ignimbrite from Inner Mongolia Provides no Indication of a Post-Middle Jurassic Age for the Daohugou Beds |
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| Authors: | GAO;Ke-Qin;REN;Dong |
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| Abstract: | Lacustrine deposits exposed at Daohugou, Inner Mongolia, China, have yielded superbly preserved vertebrate fossils. The fossil beds were first misinterpreted as of Early Cretaceous age, based on alleged occurrences of key fossils of the Jehol Biota. Compelling evidence revealed by more rigorous research involving regional biostratigraphy, radiometric dating, and paleontology supports the Middle Jurassic age of the fossil beds. Despite the awesome evidence for the Middle Jurassic age of the Daohugou beds, the age dispute has been resurrected recently by invoking an overturned stratigraphic sequence. A careful review of the data, however, found no evidence that this sequence has been overturned. In addition, many of the assumptions, on which the conjecture of the fossil beds being post- Middle Jurassic is imprudently based, are self-contradictory or otherwise misleading. Thus, the post- Middle Jurassic age of the Daohugou beds as an unfounded conclusion can readily be dismissed. |
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| Keywords: | Daohugou beds Inner Mongolia Middle Jurassic age dispute radiometric dating |
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