New progress in the study of conchostracon fossils from the Dabeigou Formation in the Luanping basin,northern Hebei Province of China
New progress in the study of conchostracon fossils from the Dabeigou Formation in the Luanping basin,northern Hebei Province of China
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发表时间：
2002
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通讯作者：
Niu Shaowu
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作者：
Niu Shaowu
河北省滦平县火斗山村张家沟剖面大北沟组中发现了丰富的甲壳类化石。包括4属22种。其中聂斯托利亚属占优势，分布于整个大北沟组，可称为聂斯托利亚动物群。在大北沟组中首次发现了吉北林-纳底岩和角状岩，它们分别发育在大北沟组下部和上部。这两个属将Nestoria动物群划分为两个组合带：下部为Nestoria- jibeilimnadia组合带，上部为Nestoria- keratestheria组合带。此外，在张家沟剖面大北沟组上段首次发现了中侏罗统土城子组重要元素cf.Pseudograpta属，进一步证明了大北沟组与土城子组有密切关系，具有重要的时代意义。
Abundant conchostracon fossils were discovered in the Dabeigou Formation at the Zhangjiagou section,Huodoushan Village,Luanping County,Hebei Province.They include4genera and22species.Among these,the species of Nestoria predominate and occur throughout the Dabeigou Formation,so they can be called the Nestoria fauna.In the Dabeigou Formation the authors for the first time found Jibeilim-nadia and Keratestheria,which occur in the lower and upper parts of the formation respectively.The two genera divide the Nestoria fauna into two assemblage zones:the Nestoria-Jibeilimnadia assemblage zone in the lower part and the Nestoria-Keratestheria assemblage zone in the upper part.In addition,the genus cf.Pseudograpta,an important element in the Middle Jurassic Tuchengzi Formation,was for the first time found in the upper part of the Dabeigou Formation at the Zhangjiagou section,which further proves that the conchostracon fauna in the Dabeigou Formation is closely related to that in the Tuchengzi Formation and has great age significance.