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地质论评  2004 

紫阳文洛克统底界生物地层学新研究

Keywords: 生物地层学化石文洛克统紫阳志留纪

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Abstract:

通过对紫阳地区10个文洛克统底界剖面的重新观察,笔者等认为晚兰多弗里期的标准化石Oktavitesspiralis(Geinitz)从未进入文洛克统,这与国际上是一致的。过去在紫阳地区所有被鉴定为C.centrifugusBoucek的标本,经详细比较均应改为C.annularisFu,其层位都产于C.lapworthi带。近年对芭蕉口剖面进行野外调查时,笔者等采到了真正的C.centrifugusBoueek和C.murchisoniCarruthers标本,因此更加完善了C.lapworthi-C.sakmaricus-C.insectus-C.centrifugus-C.murchisoni这一弓笔石演替序列。

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