浙西富阳西湖组泥盆-石炭系过渡层孢子组合  

SPORE ASSEMBLAGES FROM DEVONIAN-CARBONIFEROUS TRANSITIONAL BEDS OF HSIHU FORMATION, FUYANG, W. ZHEJIANG

作　　者：何圣策 欧阳舒[2] 

机构地区：[1]浙江区域地质调查队,浙江萧山311200 [2]中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》1993年第1期31-48,133-136,共18页Acta Palaeontologica Sinica

摘　　要：根据首次从富阳西湖组发现的孢子及其垂直分布特征,划分出下段 LH 组合和上段 DP 组合,分别归入晚泥盆世法门晚期(斯图年期)和早石炭世早期(杜内早期),即泥盆-石炭系界线通过西湖组内部,与江苏五通组类似.The 'Chienligang Sandstone' mainly composed of quartzose sandstones and widespread in W. Zhejiang was named by Liu and Chao (1927); it was subdivided into two parts, with the lower part 0-500 m and the upper part about 200 m in thi ness. Subsequently, the Chienligang 'Group' has been redefined by the Chinese geologists as comprising three formations (Table I) in ascending order, namely the Tangjiawu Formation, the Hsihu Formation and the Zhuzangwu Formation, with an overlying coal-bearing formation, the Yehchiatang Group, yielding the Late Visean-Namurian Archaeocalamites scrobiculatus-Neuropteris gigantea Flora (Zhao et al., 1986). The Tangjiawu Formation was dated Silurian, and the Zhuzangwu Formation Early Carboniferous or the latest Devonian to Tournaisian due to the presence of Lepidodendropsis cf. hirmeri Lutz, 'Sublepidodendron' wusihense (Sze), Sublepidodendron mirabile (Nath.) and Bothrodendron fuyangense Chen, whereas the Hsihu Formation has generally been dated Late D vonian mainly based on the lithological similarity to the Wutung Formation in N. Zhejiang and Jiangsu and the possible presence of Leptophloeum rhobicum in this formation at the locality of Chun'an. The Wutung Formation in Jiangsu consists of two parts, i.e. the Guanshan Member below and the Leigutai Member above. The Leigutai Member has been distinguished into at least two spore assemblage zones, i.e. the Retispora lepidophyta-Apiculiretusispora hunanensis (LH) Assemblage Zone (Strunian) below and the Dibolisporites distinctus-Auroraspora macra (DM) Assemblage Zone (late Tn 1_b-Tn 2) above. Based on the occurrence of a few spores including Cymbosporites conatus, Discernisporites micromanifestus and Spelaeotriletes exiguus in the Guanshan Formation, Cai et al. (1988) suggest that the whole Wutung Formation should be Strunian-early Tounaisian in age. In other words,the Wutung Formation contains the Devonian-Carboniferous boundary although the exact boundary still has to be determined (Ouyang and Chen, 1987a, b; 1989; Chen and Ouyang, 1987)

关 键 词：西湖组 孢子 泥盆纪 石炭纪 

分 类 号：Q913.84[天文地球—古生物学与地层学]