Application of Ostracoda from the Lower Cretaceous Liupanshan group at Pingliang (NW China) – Biostratigraphy and palaeoecology

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research Pub Date : 2025-01-08 DOI:10.1016/j.cretres.2025.106079

Yaqiong Wang , Byung-Do Choi , Robin J. Smith , Deyan Wu

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Abstract

The ostracod fauna from the Liwaxia and Madongshan formations in the Pingliang area of the Liupanshan Basin are investigated in this study. Dominated by Liupanshania typica and Lycopterocypris infantilis, the fauna also includes Ziziphocypris costata, Bisulcocypridea gaodianensis, Cypridea astuta, C. puncticulata, Mongolocypris liupanshanensis, and Limnocythere sp. Our biostratigraphic analysis constrains the age of the Liwaxia Formation to Aptian to Albian and the Madongshan Formation to the Albian. These biostratigraphic findings facilitate the correlation of ostracods from the Liupanshan Group with contemporaneous faunas from adjacent basins in China and Mongolia, supporting the hypothesis of invertebrate faunal exchange within East Asia during the Early Cretaceous. Furthermore, the endemic genus Liupanshania is reassigned to the family Notodromadidae and subfamily Cyproidinae, based on the presence of anterior and posterior striated flanges. A significant radiation of Cyproidinae even Notodromadidae, occurred in Eurasia during the Barremian to Albian. Palaeoecologically, the dominance of the ostracod Liupanshania and its co-occurrence with stromatolites in the Pingliang area of the Liupanshan Basin suggest the presence of a saline lake under evaporative, arid climatic conditions.

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本研究调查了六盘山盆地平凉地区六瓦峡地层和马东山地层的梭形目动物群。该动物群以六盘山类型（Liupanshania typica）和婴儿鞘翅目（Lycopterocypris infantilis）为主，还包括成本鞘翅目（Ziziphocypris costata）、高店鞘翅目（Bisulcocypridea gaodianensis）、星鞘翅目（Cypridea astuta）、标点鞘翅目（C. puncticulata）、六盘山蒙古鞘翅目（Mongolocypris liupanshanensis）和鞘翅目（Limnocythere sp.我们的生物地层分析将六瓦峡地层的年龄推定为始新世至白垩世，将马东山地层的年龄推定为白垩世。这些生物地层学发现有助于将六盘山组的介壳动物与中国和蒙古邻近盆地的同期动物群进行关联，从而支持早白垩世东亚地区无脊椎动物群交换的假说。此外，根据六盘山亚属前部和后部条纹状凸缘的存在，将其重新归入Notodromadidae科和Cyproidinae亚科。Cyproidinae亚科甚至Notodromadidae亚科在欧亚大陆的显著辐射发生在巴里米亚到白垩纪。从古生态学角度看，六盘山盆地平凉地区以六盘山蝶类为主，且与叠层石共生，这表明当时在干旱蒸发的气候条件下存在一个盐湖。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cretaceous Research 地学-地质学

CiteScore

4.10

自引率

19.00%

发文量

235

审稿时长

12 weeks

期刊介绍： Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.