Biostratigraphic Characteristics and Its Significance of Lower Permian in Taricuo Deep Sag of Cuoqin Basin,Tibet
The upper Trassic Quehala group of the Mesozoic , can be separated from top to bottom as Angjie formation (T1n), Ria formation (P1r) and Xiala formation (P1x), which lay over the lower Carboniferous Sisuo formation (C2s), the upper Permian strata are not exposed, The foramina-fera and bryozoan Fenedtella sp.were found in the boulder of Crinoid stem clastic limestones in th-e complex conglomerate of Angjie formation, and a few bivalvia like Wilkingia sp.etc.were also found in the 37th layer.The lower part of Ria formation mainly consists of ashen thick-bedded dolo-mitic limestones and bioclastic limestones, where the solitary coral without dissepiment is the mem-ber of the cold water fauna Lytvolasma on the northem margin of Gondwana; the upper part consist-s of ashen bioclastic limestone, coarse grain limestone with a few bryozoans, which contains some hermatypic corals like Paraipciphyllum subcystosum, Thomasiphyllum multiseptatum, Iranophyllu-m cf.mdis, and a few fosils of fusulinina, foraminifer and bryozoans.The Xiala formation contains more than five biological assemblages: fusulinina, anthozoa, foraminifera, Brachiopoda and so on, which is a strong indication of regional biostratigraphic characteristics and evolutional trend.
Tibet Cuoqin Basin biostratigraphic Genong biological assemblages
LIU Aoran LIU Yonghui TIAN Ye
Shijiazhuang University of Economics,Shijiazhuang,Hebei,050031,China
国际会议
第十八届凯洛林国际地质学术研讨会(The 18th Kerulien International Conference on Geological)
石家庄
英文
72-77
2013-09-20（万方平台首次上网日期，不代表论文的发表时间）