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Conodont Evidence for the Age of the panxian fauna,Guizhou,China

Acta Geologica Sinica(English Edition) 2006年第5期80卷 621-630页

作者： SUN Zuoyu SUN Yuanlin HAO Weicheng JIANG Dayong School of Earth and Space Sciences Peking University Beijing 100871

Detailed conodont analysis on the Yangjuan-Chupiwa section, Xinmin, panxian County, Guizhou Province, revealed a conodont sequence including four Anisian conodont zones, viz. Nicoraella germanica Zone, Nc. kockeli Zone, Paragondolella bifurcata Zone and Neogondolella constricta Zone. These zones indicate that the upper Guanling Formation consists of strata from the Bithynian to the lllyrian of the Anisian. Appearance of Neogondolella constricta suggests that the Anisian/Ladinian boundary might be in the overlying Yangliujing Formation. The panxian fauna with well-preserved marine reptile and fish fossils is proved to belong to the lower part of the conodont Nc. kockeli Zone in the studied area. Thus, the age of the panxian fauna could be the early Pelsonian of the Anisian.

关键词： conodont panxian fauna Pelsonian Anisian Middle Triassic panxian Guizhou

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Biodiversity and Sequence of the Middle Triassic panxian Marine Reptile fauna,Guizhou Province,China

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 451-459页

作者： JIANG Dayong Ryosuke MOTANI HAO Weicheng Olivier RIEPPEL SUN Yuanlin Andrea TINTORI SUN Zuoyu Lars SCHMITZ Department of Geology and Geological Museum Peking University Beijing 100871 China Department of Geology University of California Davis California USA Department of Geology The Field Museum Chicago Illinois USA Department of Earth Sciences Milano University Milan Italy

The Middle Triassic panxian fauna is a physical marker and representative record of the rapid recovery of the Triassic marine ecosystem following the Early Triassic stagnant stage after the end-Permian mass extinction. Ten marine reptile taxa have been found from the 1.82-2.10 m-thick fossiliferous level in the Upper Member of the Guanling Formation, which can be subdivided into three marine reptile beds through the analysis on the stratigraphic distributions of fossil reptiles. The Lower Reptile Bed yields the sauropterygians Placodus inexpectatus Jiang et al., 2008 and Lariosaurus hongguoensis Jiang et al., 2006, the ichthyopterygians Xinminosaurus catactes Jiang et al., 2008 and Phalarodon cf. Phalarodon fraasi Merriam, 1910, associated with Mixosaurus panxianensis Jiang et al., 2006, representing a stage of predominance of durophagous taxa. In this bed, the large complete skeletons may reach up to 2.3 m in length, and lithofacies and chemostratigraphic analyses indicate a relatively deep carbonate platform with an oxic water environment near the bottom, as well as a rising sea level The Middle Reptile Bed yields the sauropterygian Nothosaurus yangjuanensis Jiang et al., 2006 and the archosaur Qianosuchus mixtus Li et al., 2006, associated with Mixosaurus panxianensis Jiang et al., 2006. The fossils in this bed are characterized by its pincering dentition and large overall body size, with the largest possibly exceeding 3 m in length. This bed might represent a time of deepest basin with relatively anoxic condition near the bottom. The Upper Reptile Bed yields the sauropterygians Wumengosaurus delicatomandibularis Jiang et al., 2008, Keichousaurus sp., the protorosaur Dinocephalosaurus orientalis Li, 2003, and the ichthyopterygian Mixosaurus panxianensis Jiang et al., 2006. In this bed, reptilian taxa characterized by suction feeding appeared, and most are less than 1 m long. This bed corresponds to a period of decreasing water depth.

关键词： panxian fauna marine reptile Middle Triassic Anisian Guizhou China

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