Stratigraphy and age of the Daohugou Bed in Ningcheng, Inner Mongolia

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	Stratigraphy and age of the Daohugou Bed in Ningcheng, Inner Mongolia
	Wang, XL ; Zhou, ZH; He, HY ; Jin, F ; Wang, YQ ; Zhang, JY ; Wang, Y ; Xu, X ; Zhang, FC ; Wang, XL (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China.
	2005-10-01
发表期刊	CHINESE SCIENCE BULLETIN
ISSN	1001-6538
卷号	50 期号:20 页码:2369-2376
文章类型	Article
摘要	Recent fieldwork has extended the distribution of the Daohugou Bed deposits from the Daohugou Village to its several neighboring areas. The fossil-bearing Daohugou deposits uncomformably overlie complex bedrocks, and comprise three major parts. The red shales in the lower part were misidentified as belonging to the Tuchengzi Formation. Field excavation has indicated that the shales of upper part of the bed are the major fossil-bearing horizon. Due to strong tectonic activities, sediments were often folded with the sequences inverted in the region. Some newly recognized contacts between the Daohugou Bed and the volcanic rocks showed that the ignimbrite of the Tiaojishan Formation (159-164 Ma) underlies the Daohugou deposits, rather than overlying the latter as previously proposed. Thus, the age of the Daohugou deposits should be younger than the age of the ignimbrite, and thus it was incorrect to correlate the Daohugou Bed with the Middle Jurassic Jiulongshan Formation. Although biostratigraphic studies based on conchostracans and insects support a Middle Jurassic-early Late Jurassic age for the Daohugou deposits, vertebrate fossils such as Liaoxittiton, Jeholopterus and feathered maniraptorans show much resemblance to those of the Yixian Formation. In other words, despite the absence of Lycoptera, a typical fish of the Jehol Biota, the Daohugou vertebrate assemblage is closer to that of the Early Cretaceous Jehol Biota than to any other biota. We propose that the Daohugou fossil assemblage probably represents the earliest evolutionary stage of the Jehol Biota based on both vertebrate biostratigraphy and the sedimentological and volcanic features which suggest the Daohugou deposit belongs to the same cycle of volcanism and sedimentation as the Yixian Formation of the Jehol Group.; Recent fieldwork has extended the distribution of the Daohugou Bed deposits from the Daohugou Village to its several neighboring areas. The fossil-bearing Daohugou deposits uncomformably overlie complex bedrocks, and comprise three major parts. The red shales in the lower part were misidentified as belonging to the Tuchengzi Formation. Field excavation has indicated that the shales of upper part of the bed are the major fossil-bearing horizon. Due to strong tectonic activities, sediments were often folded with the sequences inverted in the region. Some newly recognized contacts between the Daohugou Bed and the volcanic rocks showed that the ignimbrite of the Tiaojishan Formation (159-164 Ma) underlies the Daohugou deposits, rather than overlying the latter as previously proposed. Thus, the age of the Daohugou deposits should be younger than the age of the ignimbrite, and thus it was incorrect to correlate the Daohugou Bed with the Middle Jurassic Jiulongshan Formation. Although biostratigraphic studies based on conchostracans and insects support a Middle Jurassic-early Late Jurassic age for the Daohugou deposits, vertebrate fossils such as Liaoxittiton, Jeholopterus and feathered maniraptorans show much resemblance to those of the Yixian Formation. In other words, despite the absence of Lycoptera, a typical fish of the Jehol Biota, the Daohugou vertebrate assemblage is closer to that of the Early Cretaceous Jehol Biota than to any other biota. We propose that the Daohugou fossil assemblage probably represents the earliest evolutionary stage of the Jehol Biota based on both vertebrate biostratigraphy and the sedimentological and volcanic features which suggest the Daohugou deposit belongs to the same cycle of volcanism and sedimentation as the Yixian Formation of the Jehol Group.
关键词	Inner Mongolia Daohugou Bed Yixian Formation Stratigraphic Sequence Early Cretaceous Jehol Biota
WOS标题词	Science & Technology
URL	查看原文
关键词[WOS]	CRETACEOUS AGE ; NORTHEAST CHINA ; PTEROSAUR ; BIOSTRATIGRAPHY ; DINOSAUR ; INSECTA ; YIXIAN ; TIME
收录类别	SCI
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000234331800019
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3507
专题	中科院古脊椎所（2000年以后）古低等脊椎动物研究室
通讯作者	Wang, XL (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wang, XL,Zhou, ZH,He, HY,et al. Stratigraphy and age of the Daohugou Bed in Ningcheng, Inner Mongolia[J]. CHINESE SCIENCE BULLETIN,2005,50(20):2369-2376.
APA	Wang, XL.,Zhou, ZH.,He, HY.,Jin, F.,Wang, YQ.,...&Wang, XL .(2005).Stratigraphy and age of the Daohugou Bed in Ningcheng, Inner Mongolia.CHINESE SCIENCE BULLETIN,50(20),2369-2376.
MLA	Wang, XL,et al."Stratigraphy and age of the Daohugou Bed in Ningcheng, Inner Mongolia".CHINESE SCIENCE BULLETIN 50.20(2005):2369-2376.

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