贵州望谟下‒中三叠统的牙形石生物地层

梁蕾; 吴奎; 田力; 童金南

doi:10.3799/dqkx.2024.020

Volume 50 Issue 1

Jan. 2025

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Liang Lei, Wu Kui, Tian Li, Tong Jinnan, 2025. Lower-Middle Triassic Conodonts of Ganheqiao Section, Wangmo County, Guizhou Province. Earth Science, 50(1): 19-32. doi: 10.3799/dqkx.2024.020

Citation:

Liang Lei, Wu Kui, Tian Li, Tong Jinnan, 2025. Lower-Middle Triassic Conodonts of Ganheqiao Section, Wangmo County, Guizhou Province. Earth Science, 50(1): 19-32. doi: 10.3799/dqkx.2024.020

Liang Lei, Wu Kui, Tian Li, Tong Jinnan, 2025. Lower-Middle Triassic Conodonts of Ganheqiao Section, Wangmo County, Guizhou Province. Earth Science, 50(1): 19-32. doi: 10.3799/dqkx.2024.020

Citation:

Liang Lei, Wu Kui, Tian Li, Tong Jinnan, 2025. Lower-Middle Triassic Conodonts of Ganheqiao Section, Wangmo County, Guizhou Province. Earth Science, 50(1): 19-32. doi: 10.3799/dqkx.2024.020

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Lower-Middle Triassic Conodonts of Ganheqiao Section, Wangmo County, Guizhou Province

doi: 10.3799/dqkx.2024.020

Liang Lei^{1, 2
,
,},
Wu Kui³,
Tian Li²,
Tong Jinnan²

1.
Hebei International Joint Research Center for Paleoanthropology, School of Earth Sciences, Hebei GEO University, Shijiazhuang 050031, China
2.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430078, China
3.
Hubei Institute of Geosciences, Wuhan 430034, China

Received Date: 2023-12-22
Available Online: 2025-02-10
Publish Date: 2025-01-25

Abstract

Abstract

The establishment of modern ecosystem in Early Triassic is challenging and subject to frequent fluctuation of environment, thus a refined time scale is demanded to explore its process and mechanism. Although conodonts are often used as index fossils in the correlation and division of Paleozoic and Early Mesozoic marine strata, the international classification and comparison criteria for multiple stages and substages of the Early-Middle Triassic have been pending. Some candidate index fossils have yet to be further tested by regional and global correlation. The deep-water strata were well developed in the Lower-Middle Triassic at the Ganheqiao Section in Wangmo County of Guizhou. In this paper, a systematic study of conodont taxonomy and stratigraphy was carried out on the samples near the Lower-Middle Triassic boundaries of the section. A total of 29 species in 15 genera were identified and 10 conodont zones were recognized, namely Neospathodus dieneri Zone, Novispathodus waageni Zone, Guangxidella bransoni Zone, Novispathodus pingdingshanensis Zone, Icriospathodus crassatus Zone, Triassospthodus homeri Zone, Triassospthodus triangularis Zone, Triassospthodus sosioensis Zone, Chiosella timorensis Zone, Nicoraella germanica Zone in ascending order. According to the distribution of conodonts in this section and the comparison with other sections, it is supported that the first occurrences of conodonts Novispathodus waageni, Novispathodus pingdingshanensis and Chiosella timorensis are used as the criteria for the Indian-Olenekian, Smithian-Spathian and Lower-Middle Triassic boundaries, respectively. In the past few years, multiple layers of marine reptiles and diverse arthropod fossils have been reported in the Triassic in the Wangmo area, indicating a multi-stage evolution of marine ecosystems. The high-resolution biostratigraphic framework established in this paper provides key evidence to calibrate the build-up time of modern marine ecosystems in study area.
- conodont,
- Smithian-Spathian boundary,
- Lower-Middle Triassic boundary,
- geobiology

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Lower-Middle Triassic Conodonts of Ganheqiao Section, Wangmo County, Guizhou Province

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