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OPERCULA OF HYOLITHS AND OPERCULUM-LIKE FOSSILS FROM THE LOWER CAMBRIAN YUERTUS FORMATION, XINJIANG
Author(s): 
Pages: 404-415,图版Ⅰ-图版Ⅲ
Year: Issue:  4
Journal: ACTA MICROPALAEONTOLOGICA SINICA

Keyword:  软舌螺口盖口盖状化石玉尔吐斯组早寒武世新疆;
Abstract: 文中系统描述了新疆乌什-阿克苏地区下寒武统玉尔吐斯组软舌螺口盖和口盖状化石5属7种,其中包括2新属3新种.Xystritheca的口盖具有复杂的锁骨构造,Pachytheca的口盖有明显的背腹扇面之分,它们与具口唇的软舌螺Microcornus共生.这些演化上较高级的软舌螺与原牙形类Jiangshanodus,Gapparodus,Amphigeisna;假牙形类Raombocorniculum;腕足类Obolus;高肌虫Dabashanella;托莫特壳类Tannuolina以及属种未定的三叶虫碎片一起组成了玉尔吐斯组新的小壳化石组合面貌.这些化石属种在梅树村期地层中是没有见过的,只在国内外相当于筇竹寺期地层中出现,有的还被视为筇竹寺阶的标准化石,因此新疆玉尔吐斯组的时代只能相当于筇竹寺期.
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