Early Triassic bivalves from the Feixianguan Formation in Xingyi, Guizhou and the Ximatang Formation in Qiubei, Yunnan (southern China)

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• 作者：Yan Hong Pan^a ; ^{yhpan@nigpas.ac.cn" class="auth_mail} ; Shi Xue Hu^b ; Jin Geng Sha^a ; Qi Yue Zhang^b ; Ya Qiong Wang^a ; Chang Yong Zhou^b ; Wen Wen^b ; Jin Yuan Huang^b ; Tao Xie^b
• 关键词：Bivalves ; Early Triassic ; Southwest China
• 刊名：Palaeoworld
• 出版年：June 2014
• 年：2014
• 卷：23
• 期：2
• 页码：143-154
• 全文大小：3910 K

文摘

Based on newly collected materials from the Lower Triassic Feixianguan Formation of Xiongwu section in Xingyi, Guizhou and the Ximatang Formation of Ximatang section in Qiubei, Yunnan, southern China, nine species belonging to seven genera are described. Two bivalve assemblages are recognized and regionally correlated in South China. The bivalve assemblage from the Feixianguan Formation of Xiongwu exhibits a higher diversity including seven species belonging to seven genera: Claraia griesbachi, Leptochondria virgalensis, Entolium (Entolium) microtis, Towapteria scythicum, Bakevillia exporrecta, Bositra sp., and Unionites? fassaensis. In contrast, the bivalve assemblage from the Ximatang Formation of Ximatang has a much lower diversity, consisting of only two species, i.e., Claraia griesbachi and Claraia radialis. Additionally, C. griesbachi and C. radialis, as the most common species of Claraia in the Early Triassic, are revised.