Onthe genus Fenghuangella Yang in Zhou et al., 1977 from the lowest Chaumitien Formation (uppermost Guzhangian, Cambrian) from Shandong and eastern Liaoning, North China
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Abstract:
Fenghuangella is here reported from the lowest part of the Chaumitien Formation (uppermost Guzhangian, Miaolingian Series) at the Jiulongshan section, Gangcheng District, Jinan City, Shandong and the Baijiashan section, Dalian City, Liaoning. The diagnosis of Fenghuangella is revised. The matching of cranidium of Fenghuangella with its corresponding pygidium is discussed in detail. The pygidium previously assigned to Fenghuangella subtriangularis Lin and Zhou in Lin et al., 1983 is better grouped within the genus Gaoloupingia Yuan and Yin because of its shorter, and narrower pygidial axis, wider pleural field, well developed pleural and interpleural furrows, and ornamentation of dense and coarse granules. The pygidia assigned to Fenghuangella coniforma Yang in Zhou et al., 1977 are here transferred to the genus Pseudomapania owing to its wider pleural field (tr.), deeper pleural furrows, shallower but distinct interpleural furrows, more convex anterior band of pleural ribs, and narrower pygidial border. The pygidia recognized as Fenghuangella laevis Park and Choi, 2011 are here considered as a juvenile ceratopygid trilobite. The pygidia of Fenghuangella laevis are correctly matched with their cranidia for the first time. The boundary between Miaolingian and Furongian in North China Platform is also discussed in detail. The lower boundary of the Paibian Stage (Furongian Series) is defined by the first appearance datum (FAD) of Prochuangia mansuyi Kobayashi, 1935. The Liostracina simesi–Placosema convexa Zone bearing Fenghuangella laevis Park and Choi, 2011 is placed within the uppermost Guzhangian of the Miaolingian Series. This placement is of great significance for the correlation of the boundaries of Miaolingian and Furongian in Jiangnan Slope and North China Platform.
