鄂西早三叠世南漳-远安动物群地层分布特征

阎春波; 李姜丽; 程龙; 赵璧; 邹亚锐; 牛东毅; 陈刚; 方子晨

doi:10.3799/dqkx.2020.023

Volume 46 Issue 1

Jan. 2021

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Article Navigation > Earth Science > 2021 > 46(1): 122-135

Yan Chunbo, Li Jiangli, Cheng Long, Zhao Bi, Zou Yarui, Niu Dongyi, Chen Gang, Fang Zicheng, 2021. Strata Characteristics of the Early Triassic Nanzhang-Yuan'an Fauna in Western Hubei Province. Earth Science, 46(1): 122-135. doi: 10.3799/dqkx.2020.023

Citation:

Yan Chunbo, Li Jiangli, Cheng Long, Zhao Bi, Zou Yarui, Niu Dongyi, Chen Gang, Fang Zicheng, 2021. Strata Characteristics of the Early Triassic Nanzhang-Yuan'an Fauna in Western Hubei Province. Earth Science, 46(1): 122-135. doi: 10.3799/dqkx.2020.023

Citation:

Yan Chunbo, Li Jiangli, Cheng Long, Zhao Bi, Zou Yarui, Niu Dongyi, Chen Gang, Fang Zicheng, 2021. Strata Characteristics of the Early Triassic Nanzhang-Yuan'an Fauna in Western Hubei Province. Earth Science, 46(1): 122-135. doi: 10.3799/dqkx.2020.023

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Strata Characteristics of the Early Triassic Nanzhang-Yuan'an Fauna in Western Hubei Province

doi: 10.3799/dqkx.2020.023

Yan Chunbo^{1, 2, 3
,
,},
Li Jiangli^{2, 4},
Cheng Long^{1, 2, 3
,
,
,},
Zhao Bi^{2, 4},
Zou Yarui^{2, 4},
Niu Dongyi^{1, 2, 3},
Chen Gang^{2, 4},
Fang Zicheng⁵

1.
Wuhan Center of China Geological Survey, Wuhan 430205, China
2.
Geological Science and Technology Innovation Center of Central South China, Wuhan 430205, China
3.
Key Laboratory for Paleontology and Coevolution of Life and Environment, China Geological Survey, Wuhan 430205, China
4.
Hubei Institute of Geosciences, Wuhan 430034, China
5.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2020-02-15
Publish Date: 2021-01-15

Abstract

Abstract

Based on the study of fossils spots and representative sections of the Nanzhang-Yuan'an Fauna, especially the Zhangjiawan section in Yuan'an county, the lithostratigraphic characteristics of the Jialingjiang Formation was redefined between Nanzhang and Yuan'an areas. It is reasonable that the Jialingjiang Formation in those areas should be divided into three members, in which the Nanzhang-Yuan'an Fauna is mainly yielded in the upper part of Member II. The lithology yielded the Nanzhang-Yuan'an Fauna mainly consists of laminated micritic limestone intercalated with normal micrite. Through systematical fossil excavations and detailed descriptions of the Zhangjiawan section, the vertical stratigraphic distributions of the Nanzhang-Yuan'an Fauna are preliminary recognized. Marine reptile fossils could exist in almost whole strata of the upper part of Member II of the Jialingjiang Formation, but the fossil abundance and diversity change largely in different layers. The abundance and diversity are relatively higher in seven strata assemblages than others, the peak appeared at the uppermost assemblages. The horizontal paleogeographic distribution features of the fauna in those areas could be summarized as four facies belts, named A, B, C and D zones, which correspond to empty zone, marginal zone, relative enrichment zone and enrichment zone, respectively. Different zones reflect the fauna experienced from rare to rich, meanwhile the water depth gradually deepens from northeast to southwest. The distributions of the Nanzhang-Yuan'an Fauna indicate that the marine reptiles could live in restricted shallow water or lagoon environment. The research will lay a good foundation not only for the co-evolution between early marine reptiles and environment, but also for its response to the Early Triassic biological recovery.
- Nanzhang-Yuan'an Fauna,
- marine reptile,
- Jialingjiang Formation,
- Zhangjiawan section,
- Early Triassic,
- Western Hubei Province,
- paleontology

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References(40)

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Strata Characteristics of the Early Triassic Nanzhang-Yuan'an Fauna in Western Hubei Province

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