Zonation and biofacies of the Early Mississippian conodonts from Baoshan, Yunnan, Southwest China

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Palaeoworld Pub Date : 2024-06-01 DOI:10.1016/j.palwor.2023.03.010

Wen-Qi Wang, Xiang-Dong Wang, Ke-Yi Hu

引用次数: 0

Abstract

Early Mississippian Yudong and Shihuadong formations are well exposed in the Yudong I and Yudong II sections, Shidian, Baoshan, western Yunnan, Southwest China. Abundant and diverse conodonts are recovered from the two formations. A total of 29 species/subspecies belonging to 10 genera are identified. The Siphonodella and Scaliognathus anchoralis-Gnathodus pseudosemiglaber zones are recognized. Through cluster analysis, one conodont biofacies, Polygnathus biofacies, and two subbiofacies, Bispathodus-Pseudopolygnathus and Gnathodus subbiofacies, are identified. Changes in these conodont biofacies and subbiofacies are interpreted as a result of fluctuation of sea level in the Baoshan Block during the middle to late Tournaisian, Early Mississippian. Geniculatus claviger is recovered and systematically described in China for the first time.

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中国西南云南保山早密西西比统锥齿动物的区系和生物构成

在中国西南部云南西部保山施甸的玉洞一区和玉洞二区，早密西西比时期的玉洞地层和石花洞地层出露良好。在这两个地层中发现了丰富多样的锥齿类动物。共鉴定出隶属于 10 个属的 29 个种/亚种。确认了 Siphonodella 和 Scaliognathus anchoralis-Gnathodus pseudosemiglaber 区。通过聚类分析，确定了一个锥齿动物生物群落--Polygnathus 生物群落，以及两个亚生物群落--Bispathodus-Pseudopolygnathus 和 Gnathodus 亚生物群落。这些化石生物底层和亚生物底层的变化被解释为中晚期图尔奈斯期（Tournaisian）和早密西西比期（Mississippian）宝山地块海平面波动的结果。在中国首次发现并系统描述了Geniculatus claviger。

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来源期刊

Palaeoworld PALEONTOLOGY-

CiteScore

4.00

自引率

5.90%

发文量

期刊介绍： Palaeoworld is a peer-reviewed quarterly journal dedicated to the study of past life and its environment. We encourage submission of original manuscripts on all aspects of palaeontology and stratigraphy, comparisons of regional and global data in time and space, and results generated by interdisciplinary investigations in related fields. Some issues will be devoted entirely to a special theme whereas others will be composed of contributed articles. Palaeoworld is dedicated to serving a broad spectrum of geoscientists and palaeobiologists as well as serving as a resource for students in fields as diverse as palaeobiology, evolutionary biology, taxonomy and phylogeny, geobiology, historical geology, and palaeoenvironment. Palaeoworld publishes original articles in the following areas: •Phylogeny and taxonomic studies of all fossil groups •Biostratigraphy, chemostratigraphy, chronostratigraphy •Palaeoecology, palaeoenvironment and global changes throughout Earth history •Tempo and mode of biological evolution •Biological events in Earth history (e.g., extinctions, radiations) •Ecosystem evolution •Geobiology and molecular palaeobiology •Palaeontological and stratigraphic methods •Interdisciplinary studies focusing on fossils and strata