Temporal constraints on the terrestrial biota from the Yingzuilazi Formation (Baishan Basin), northeast China

Temporal constraints on the terrestrial biota from the Yingzuilazi Formation (Baishan Basin), northeast China
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白山盆地鹰嘴腊子组陆地生物群的时相约束

DOI:
10.1016/j.cretres.2022.105275
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发表时间:
2022-06
影响因子:
2.1
通讯作者:
Yuting Zhong
Yuting Zhong
中科院分区:
地球科学2区
文献类型:
--
作者:
Yaqiong Wang;Yuting Zhong

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白山盆地鹰嘴寨子组生物群化石组合丰富,包括一种介形类新描述种Cypridea horni sp. nov. Wang,为研究主要陆生动植物的演化提供了宝贵的机会。然而,这种生物群的年龄仍然存在争议。本文报道了鹰嘴旮旯子组上部西姆斯锆石U-Pb年龄为128.5 ± 1.0Ma。结合我们新获得的鹰嘴寨子组介形类生物地层年龄,表明鹰嘴寨子组生物群的时代主要为巴列姆期(129 ~ 127 Ma)。鹰嘴寨子组生物群与严格意义上的热河生物群I期在时间上一致,但在综合生物地层学和古生物学资料上与严格意义上的热河生物群II期有密切的关系。该生物群不仅对了解东亚早白垩世陆生生物的时空演化具有重要意义,而且对探讨陆生生物演化与华北陆壳破坏过程之间的可能关系也具有重要意义。
The biota from the Yingzuilazi Formation in the Baishan Basin yields a diverse fossil assemblage (including a new described ostracod species Cypridea horni sp. nov. Wang), which provides a valuable opportunity to investigate the evolution of major terrestrial plants and animals. However, the age of this biota is still controversial. To address this, we report a new SIMS zircon U–Pb age of 128.5 ± 1.0 Ma for the uppermost part of the Yingzuilazi Formation. This age, combined with our new ostracod biostratigraphic age from the Yingzuilazi Formation, indicate that the age of biota from the Yingzuilazi Formation is mainly Barremian (∼129 Ma to ∼127 Ma). It seems that the biota from the Yingzuilazi Formation temporal coincides with Jehol Biota sensu stricto stage I, but it is closely related to Jehol Biota sensu stricto stage II in terms of comprehensive biostratigraphic and paleontoloical materials. Therefore, this biota shows the significances not only in understanding the spatiotemporal evolution of the Early Cretaceous terrestrial biotas in East Asia, but also in exploring the possible relationship between the terrestrial life evolution and the destruction processes of the North China Craton.
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