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xi sha qun dao xi zuo yi jing zhong xin shi di ceng gu sheng wu qun he gu huan jing yan jiu
Author(s): 
Pages: 215-223
Year: Issue:  3
Journal: Acta Micropalaeontologica Sinica

Keyword:  地层古生物群和古环境中新统西沙群岛南中国海;
Abstract: 根据壳状珊瑚藻、海相底栖介形类和有孔虫资料,西琛一井井深346.92-802.17m的地层分别被归为下中新统西沙组下段(井深550-802.17m)和上段(431-550m),中中新统宣德组(353.40-431m)。西沙组下段包括3个介形类组合,自下而上为:①Aurilaxishaensis-Tenedocytherexishaensis,②Tenedocytherexishaensis-Radimellapalycosta-Aurilaxishaensis,③Neonesideaventrocaudata-N.yongleensis。下、中中新统的大有孔虫总称为Nephrolepldina-Miogypsina带,又细分为2个亚带,即西沙组的Miolepidocyclina-Miogypsinoides亚带和宣德组的Cycloclypeus亚带。壳状珊瑚藻有2个化石组合带,即西沙组上段的Aethesolithonnanhaiensis-A,guatemalaensum带和宣德组的Mesophyllumiraqense带。这些壳状珊瑚藻、大有孔虫和介形类Radimella和Neonesidea所有的属在现?
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