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Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications
Rao, Xin (饶馨)1,2,3; Skelton, Peter W.4; Sano, Shin-ichi5; Zhang, Yiqiang3; Zhang, Yichun (张以春)1,2; Pan, Yanhong (泮燕红)2,6; Cai, Huawei (蔡华伟)2,6; Peng, Bo7; Zhang, Tong8; Ma, Zhaoxiong8
2020
Source PublicationCRETACEOUS RESEARCH
ISSN0195-6671
Volume105Pages:13
Abstract

A new polyconitid rudist Shajia tibetica gen. et sp. nov., of late Aptian to Albian age, is described from the Langshan Formation of Nyima County, northern Lhasa Block, Tibet. Though comparable in size and external morphology with Horiopleura haydeni Douville, which is a common endemic species in southwestern Asia, Shajia differs from the latter species in its possession of an inwardly inclined, instead of outwardly facing, posterior myophore in the right valve. In addition, a single specimen from Ladakh, which was previously assigned to Polyconites? sp., on account of a similar myophoral distinction from H. haydeni, is transferred to the new genus. Shajia is considered most likely to have been derived from one of a group of Horiopleura species that lived on the southern margin of the Mediterranean Tethys. The so-called 'Yasin fauna' represented by the late Aptian to Albian Horiopleura haydeni/Auroradiolites gilgitensis rudist association, is considered to be restricted to southwestern Asia, including Afghanistan, Kohistan in northern Pakistan and Ladakh in northern India, though those two species in particular have not so far been recorded from the Lhasa Block of Tibet. Nevertheless, S. tibetica co-occurs with Auroradiolites biconvexus (Yang et al.), which probably evolved directly from A. gilgitensis (Douville), and the age of the latter association is in accordance with the generally accepted age of the Yasin fauna as late Aptian to Albian. Hence the S. tibetica and A. biconvexus association can be considered a regional variant of the Yasin fauna, which had evidently already dispersed to the Lhasa Block by the late Aptian. So the Langshan Formation can be considered palaeogeographically linked with other mid-Cretaceous shallow-marine carbonate deposits in adjacent southwestern Asian regions. These findings also provide new evidence that the age of the rudist assemblage of the Lhasa Block is late Aptian to Albian, although a slightly younger age cannot be excluded. (C) 2019 Elsevier Ltd. All rights reserved.

KeywordLhasa block Langshan formation Mid-cretaceous Rudists Polyconitidae Yasin fauna
DOI10.1016/j.cretres.2019.05.009
Language英语
WOS KeywordSHYOK SUTURE ZONE ; YASIN-TYPE RUDIST ; LADAKH ARC ; TECTONIC EVOLUTION ; RADIOLITID RUDIST ; NORTHERN LADAKH ; HIPPURITIDA ; CHINA ; COLLISION ; INDIA
Funding ProjectNational Natural Science Foundation of China[41702014] ; National Natural Science Foundation of China[41730317] ; National Natural Science Foundation of China[41302011] ; State Key Laboratory of Palaeobiology and Stratigraphy[20162110] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000] ; China Geological Survey[DD20160015] ; UNESCO IUGS IGCP (United Nations Educational, Scientific and Cultural Organization International Union of Geological Sciences)[632]
WOS Research AreaGeology ; Paleontology
WOS SubjectGeology ; Paleontology
WOS IDWOS:000504515900004
Funding OrganizationNational Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy ; Strategic Priority Research Program of the Chinese Academy of Sciences ; China Geological Survey ; UNESCO IUGS IGCP (United Nations Educational, Scientific and Cultural Organization International Union of Geological Sciences)
PublisherACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/29749
Collection中国科学院南京地质古生物研究所
Corresponding AuthorRao, Xin (饶馨); Skelton, Peter W.
Affiliation1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Dept Invertebrate Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
4.Open Univ, Sch Environm Earth & Ecosyst Sci, Milton Keynes MK7 6AA, Bucks, England
5.Univ Toyama, Grad Sch Sci & Engn Res, Dept Earth Syst Sci, 3190 Gofuku, Toyama, Toyama 9308555, Japan
6.Chinese Acad Sci, CAS Key Lab Econ Stratig & Palaeogeog, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Jiangsu, Peoples R China
7.China Geol Survey, Nanjing Ctr, Nanjing 210016, Jiangsu, Peoples R China
8.Sichuan Geol Survey, 25 North Renmin Rd, Chengdu 610084, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Rao, Xin ,Skelton, Peter W.,Sano, Shin-ichi,et al. Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications[J]. CRETACEOUS RESEARCH,2020,105:13.
APA Rao, Xin .,Skelton, Peter W..,Sano, Shin-ichi.,Zhang, Yiqiang.,Zhang, Yichun .,...&Ma, Zhaoxiong.(2020).Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications.CRETACEOUS RESEARCH,105,13.
MLA Rao, Xin ,et al."Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications".CRETACEOUS RESEARCH 105(2020):13.
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