{"title":"New material of heteromorph ammonites from the Lower Cretaceous of Lhozhag County, southern Tibet and its biostratigraphic implications","authors":"Cheng Ji , Wangjiu Mima , Danzeng Awang , Bo Xu","doi":"10.1016/j.palwor.2023.06.004","DOIUrl":null,"url":null,"abstract":"<div><p><span><span>Cretaceous ammonites are still poorly known in </span>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 </span><em>Aspinoceras</em>, ? <em>Hemihoplites</em>, Heteroceratidae gen. et sp. indet, ? <em>Mortoniceras</em> and <em>Parancyloceras</em><span><span>, 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 </span>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.</span></p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Palaeoworld","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1871174X23000586","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PALEONTOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
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.
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
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