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Middle Ordovician actinocerid nautiloids (Cephalopoda) from Xainza County, Tibet, western China, and their paleogeographic implications

Published online by Cambridge University Press:  14 March 2018

Xiang Fang Open the ORCID record for Xiang Fang [Opens in a new window] ,
Tingen Chen ,
Clive Burrett ,
Yongsheng Wang ,
Yonggui Qu ,
Chunzi Zheng ,
Yunbai Zhang ,
Yuandong Zhang  and
Wenjie Li
Xiang Fang
Affiliation:
CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉 University of Chinese Academy of Sciences, Beijing 100049, China
Tingen Chen
Affiliation:
CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉
Clive Burrett
Affiliation:
School of Physical Sciences, University of Tasmania, Tasmania 7001, Australia 〈[email protected]〉 Palaeontological Research and Education Centre, Mahasarakham University, Mahasarakham 44150, Thailand
Yongsheng Wang
Affiliation:
Jilin Institute of Geological Survey, Changchun 130061, China 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉
Yonggui Qu
Affiliation:
Jilin Institute of Geological Survey, Changchun 130061, China 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉
Chunzi Zheng
Affiliation:
Jilin Institute of Geological Survey, Changchun 130061, China 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉
Yunbai Zhang
Affiliation:
CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉
Yuandong Zhang
Affiliation:
CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉
Wenjie Li
Affiliation:
CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉, 〈[email protected]〉 University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

Actinocerid nautiloids from the Lhasai Formation in the Xainza region are studied systematically for the first time. The nautiloids are identified as Middle Ordovician in age based on stratigraphic correlations with those from North China, Sibumasu, North Australia (northern Gondwana), and North America (Laurentia). A cluster analysis shows strong affinities between the actinocerid nautiloids of the Lhasa Terrane and those of the Himalaya, North China, and Sibumasu terranes. Our results support Middle Ordovician paleogeographic reconstructions that place North China rather than South China much closer to Australia. Nine species assigned to six genera of Meitanoceratidae, Wutinoceratidae, Armenoceratidae, Ormoceratidae, and Discoactinoceratidae are described in detail: Pomphoceras nyalamense (Chen, 1975), Pomphoceras yaliense (Chen, 1975), Wutinoceras cf. W. foerstei (Endo, 1930), Mesowutinoceras giganteum Chen in Chen and Zou, 1984, Armenoceras tani (Grabau, 1922), Armenoceras teicherti Endo, 1932, Armenoceras xizangense new species, Deiroceras globosom Zou and Shen in Chen and Zou, 1984, and Discoactinoceras cf. D. multiplexum Kobayashi, 1927.

UUID: http://zoobank.org/ba851fea-e107-4754-a0f4-a70744e325ab

Type
Articles
Information
Journal of Paleontology , Volume 92 , Issue 3 , May 2018 , pp. 398 - 411
Copyright
Copyright © 2018, The Paleontological Society 

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