Valanginian ammonite biostratigraphy of the La Peña del Águila section, Zacatecas State, northern Mexico

IF 1.9 3区地球科学 Q1 GEOLOGY Cretaceous Research Pub Date : 2024-02-20 DOI:10.1016/j.cretres.2024.105865

J.R. Ovando-Figueroa , J.A. Jacobo-Delgado , M. Company , R. Barragán , C.F. Ramírez-Peña , G. Chávez-Cabello , J.A. Moreno-Bedmar

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Abstract

An ammonite biostratigraphic analysis was carried out for the La Peña del Águila section, Zacatecas State, northern Mexico, within Valanginian strata of the Taraises Formation. Bed-by-bed sampling yielded 208 ammonites identified in 13 taxa. The biostratigraphic analysis allowed us to identify two ammonite zones: Neocomites neocomiensiformis and Karakaschiceras inostranzewi; and one subzone: Neocomites platycostatus. These biostratigraphic units range within the lower Valanginian. The identified fauna in the La Peña del Águila section has been previously reported in the Mediterranean region. The faunal similarity allows us to employ the Standard Mediterranean Ammonite Scale for the analysis of the current section. This affinity between the Mexican and Mediterranean ammonite faunas could be explained by the proximity and communication between these two areas through the Hispanic corridor during the Valanginian.

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墨西哥北部萨卡特卡斯州 La Peña del Águila 断面的瓦朗基尼安虫生物地层学

对墨西哥北部萨卡特卡斯州 La Peña del Águila 地段的塔拉伊塞斯地层瓦朗基年地层中的氨水母进行了生物地层分析。通过逐层取样，共鉴定出 13 个类群的 208 只氨甲昆虫。通过生物地层分析，我们确定了两个鹦鹉螺区：Neocomites neocomiensiformis 和 Karakaschiceras inostranzewi；以及一个亚区：Neocomites platycostatus。这些生物地层单元属于下瓦朗基尼期。La Peña del Águila 剖面中已确定的动物群以前在地中海地区也有报道。动物群的相似性使我们能够采用标准地中海鲑鱼尺度来分析当前的剖面。墨西哥和地中海氨石群之间的这种亲缘关系可以解释为在瓦朗基尼期，这两个地区之间通过西班牙走廊进行的接近和交流。

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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.