Cephalopods from the Upper Ordovician of the North Qilian Mountains region: Implications for palaeobiogeography

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Palaeoworld Pub Date : 2026-04-01 Epub Date: 2025-11-07 DOI:10.1016/j.palwor.2025.201048

Jia-Qi Song , Xiang Fang , Yu-Chen Zhang , Xin Wei , Ya-Tao Zhang , Yi Wang , Ren-Bin Zhan

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Abstract

The North Qilian Mountains region is an important component of the Proto-Tethys Archipelagic Palaeocean. The Koumenzi Formation (Katian, Upper Ordovician) in the region yields a significant number of Ordovician fossils, of which cephalopods have rarely been systematically studied and recorded. Herein, a moderately preserved cephalopod collection from the Koumenzi Formation is presented from the North Qilian Mountains, Qilian Orogenic Belt. This fossil assemblage, obtained from the section near the upper reaches of the Tianbao River, Qilian County, Qinghai Province, consists of Anaspyroceras sp., Geisonocerina? sp., Paradnatoceras nyalamense, as well as some unnamed oncoceratoid and orthoceratoid cephalopods. Furthermore, quantitative palaeoecological analyses based on global occurrences, uncover notable provincialism of Katian cephalopods. Two cephalopod provinces related to palaeolatitude are recognised by cluster analysis and weighted network analysis. Global oceanic currents might have been responsible for the pattern of the cephalopod faunal composition and distribution in the Katian.

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北祁连山地区上奥陶统头足类：古生物地理学意义

北祁连山地区是原特提斯群岛古海洋的重要组成部分。该地区上奥陶统卡田口门子组出土了大量的奥陶系化石，其中头足类化石的系统研究和记录较少。本文报道了祁连造山带北祁连山口门子组保存较好的头足类动物标本。该化石组合来自青海省祁连县天宝河上游附近的剖面，由Anaspyroceras sp., Geisonocerina？sp.，副角角兽（parnatoceras nyalamense），以及一些未命名的头足类和正角类。此外，基于全球分布的定量古生态分析揭示了天津头足类的显著地方性。通过聚类分析和加权网络分析识别出与古纬度相关的两个头足类省。全球洋流可能对卡提亚地区头足类动物的区系组成和分布模式负责。

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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