震旦纪陡山沱期凝源类Tianzhushania属研究进展
New advances in the study of the Sinian Doushantuoan acritarch genus Tianzhushania
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摘要: 大型具刺疑源类TianZhushania的属名源于湖北长阳天柱山地区，模式标本最早发现于震旦系统陡山沱组的燧石结核中（岩石薄片）。本文综合了20多年来国内外有关该属的报道和研究，并结合最近笔者对贵州瓮安地区震旦系陡山沱组硅化保存的Tianzhushania tuberifera Yin,Gan and Xing2001与磷酸盐化保存的球状实体化石Megasphaera ornata Xiao and Knoll2000之间关系的最新研究结果，对大型具刺疑源类Tianzhushania属的形态特征，巳定种的地理分布，地层意义和可能的亲缘关系等问题进行探讨。Abstract: The genus of large-sized acanthomorphic acritarchs ,Tianzhushania,was named from Tianzhu Mountain in Changyang County,Hubei Province,where it was first described,and its typical species was first found from chert nodules(in thin sections )from the Sinian Doushantuo Formation.In this paper,the authors summarize the reports and researches about the genus published at home and abroad in the past20-odd years.On that basis,combined with the latest study of the relationships between Tianzhushania tuberifera Yin,Gao and Xing2000,preserved in siliceous rocks,and Megasphaera ornata Xiao and Knoll2000,which are pellet body fossils preserved by prophorization in the Sinian Doushantuo Formation,the authors discuss such problems as the morphological features,geographical distribution,stratigraphic signifi-cance and possible affinity of the large-sized acanthomorphic genus Tianzhushania.
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