冀北滦平盆地大店子组中网雕饰叶肢介Clithrograpta属的发现及其意义
Discovery of conchostracan genus Clithrograpta and its significance in the Dadianzi Formation,Luanping basin,northern Hebei
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摘要: 在深入研究滦平盆地大店子组叶肢介化石时，于该组上部首次发现了网雕饰叶肢介Clithrograpta属，产出层数多，个体数量大，种的分异度高，为冀北滦平盆地大店子组的地层划分与对比，正确建立冀北-辽西陆相侏罗-白垩系的地层格架，提供了关键而有力的古生物证据。根据这一发现和大北沟组至西瓜园组叶肢介化石组合序列，本区大店子组上部（3-4段）可与辽西建昌盆地“义县组”下部（原大新房子组）对比；证明辽西地区缺失相当于本区的大店子组下部（1-2段）地层，西瓜园组大体相当于辽西的义县组。Abstract: In an intensive study of fossil conchostracans from the Lower Cretaceous Dadianzi Formation in the Luanping basin,northern Hebei,the authors found the genus Clithrograpta W.Wang,1987in the upper part of this formation.It is characterized by occurrence in many beds,large numbers of individuals and a high diversity of species.This discovery provides key and strong paleontological evidence for the stratigraphic division and correlation in the Lower Cretaceous Dadianzi Formation in the Luanping basin,northern Hebei and the correct establishment of the continental Jurassic-Cretaceous stratigraphic framework in northern Hebei-western Liaoning.According to this discovery and the conchostracan assemblage se-quence in the Dabeigou Formation and Xiguayuan Formation,the upper part(3rd and4th Members)of the Dadianzi Formation in the area may be correlated with the lower part(original Daxinfangzi Formation)of the"Yixian Formation"in the Jianchang basin,western Liaoning,suggesting that the lower part(1st and2nd Members)of the Dadianzi Formation of the area is absent in western Liaoning;the Xiguayuan Formation is largely equivalent to the Yixian Formation of western Liaoning.
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Keywords:
- Clithrograpta /
- northern Hebei /
- Luanping basin /
- Dadianzi Formation
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