藏南拉萨县下白垩统异形菊石新材料及其生物地层学意义

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Palaeoworld Pub Date : 2024-06-01 DOI:10.1016/j.palwor.2023.06.004

Cheng Ji , Wangjiu Mima , Danzeng Awang , Bo Xu

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引用次数: 0

摘要

在中国西部西藏，白垩纪的棘皮动物仍然鲜为人知。在这里，我们描述了一个来自西藏南部洛扎县拉康地层下统的新的异形鹦鹉螺动物群。至少发现了五个属的材料，包括Aspinoceras、Hemihoplites、Heteroceratidae gen.Mortoniceras和Parancyloceras，其中三个属是首次在该地区发现。这些鹦鹉螺动物群表明，拉康地层的年代大约为晚白垩世至白垩纪（早白垩世）。这项研究证明，拉康地层与邻近的甘巴组（Gamba Group）不是同时代的，甘巴组稍年轻一些，这与之前的解释不同。

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New material of heteromorph ammonites from the Lower Cretaceous of Lhozhag County, southern Tibet and its biostratigraphic implications

Cretaceous ammonites are still poorly known in Tibet, western China. Here we describe a new heteromorph ammonite fauna from the Lower Member of the Lakang Formation in the Lhozhag County, southern Tibet. Material of at least five genera are recognized, including Aspinoceras, ? Hemihoplites, Heteroceratidae gen. et sp. indet, ? Mortoniceras and Parancyloceras, among which three genera are reported from this area for the first time. This ammonite fauna indicates that the age of the Lakang Formation is approximately late Hauterivian to Albian (Early Cretaceous). This study proves that the Lakang Formation was not contemporaneous with the adjacent Gamba Group, which is slightly younger, different from a previous interpretation.

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来源期刊

Palaeoworld PALEONTOLOGY-

CiteScore

4.00

自引率

5.90%

发文量

期刊介绍： Palaeoworld is a peer-reviewed quarterly journal dedicated to the study of past life and its environment. We encourage submission of original manuscripts on all aspects of palaeontology and stratigraphy, comparisons of regional and global data in time and space, and results generated by interdisciplinary investigations in related fields. Some issues will be devoted entirely to a special theme whereas others will be composed of contributed articles. Palaeoworld is dedicated to serving a broad spectrum of geoscientists and palaeobiologists as well as serving as a resource for students in fields as diverse as palaeobiology, evolutionary biology, taxonomy and phylogeny, geobiology, historical geology, and palaeoenvironment. Palaeoworld publishes original articles in the following areas: •Phylogeny and taxonomic studies of all fossil groups •Biostratigraphy, chemostratigraphy, chronostratigraphy •Palaeoecology, palaeoenvironment and global changes throughout Earth history •Tempo and mode of biological evolution •Biological events in Earth history (e.g., extinctions, radiations) •Ecosystem evolution •Geobiology and molecular palaeobiology •Palaeontological and stratigraphic methods •Interdisciplinary studies focusing on fossils and strata