Cretaceous Research最新文献

{"title":"Sedimentary conditions and palaeoenvironment during the Early Cretaceous: Evidence from macerals and organic carbon isotopes of the coal from Hailar Basin, Northeast China","authors":"Rongkun Jia ,&nbsp;Jingjing Liu ,&nbsp;James C. Hower ,&nbsp;Yaofa Jiang ,&nbsp;Shumao Zhao ,&nbsp;Qiuchan Han ,&nbsp;Niande Shang ,&nbsp;Jiawei Feng ,&nbsp;Kaiyan Teng","doi":"10.1016/j.cretres.2025.106118","DOIUrl":"10.1016/j.cretres.2025.106118","url":null,"abstract":"<div><div>The Cretaceous represented a Period of intense palaeoenvironmental change. Coal seams preserve continual records of palaeoenvironments, such as wildfire events that occur during peat accumulation. To understand wildfire events and terrestrial climate variations during the peat accumulation, maceral characteristics and organic carbon isotope compositions were examined in the Lower Cretaceous coals from Yimin and Baorixile mines, which are located in the south and north of Hailar Basin, Northeast China, respectively. The dominant macerals are inertinite and huminite and the former has an average content of 57.9 % and 51.3 % in the Yimin and Baorixile mines, respectively, indicating the coals are an inertinite-rich. The features and abundance of inertinite shows they are formed by high frequency-wildfire events. The palaeo-wildfire temperatures estimated by average inertinite reflectance of the Yimin and Baorixile coal mines are proximately 333 °C and 344 °C, respectively, indicating that the palaeo-wildfire were the type of ground fire. The difference in palaeo-wildfire temperatures between the Baorixile and Yimin coal mines indicates that different vegetation types were developed in the northern and southern regions. Wildfire, an important event of the Early Cretaceous peat-accumulating system in the Hailar Basin, might have influenced the evolution of vegetation and ecological cycle both in the land and water systems. The subtle variability of the organic carbon isotope in the coal seam profile implies a response to the palaeoclimate change of seasonally wet and dry.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"171 ","pages":"Article 106118"},"PeriodicalIF":1.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First occurrence of Distobatus Werner, 1989 (Elasmobranchii: Hybodontiformes) in the middle Cretaceous (Albian–Cenomanian) of Brazil: Taxonomic and biogeographical implications","authors":"Paulo M. Brito ,&nbsp;Ingrid M. Veiga ,&nbsp;Didier B. Dutheil ,&nbsp;Lilian P. Bergqvist","doi":"10.1016/j.cretres.2025.106119","DOIUrl":"10.1016/j.cretres.2025.106119","url":null,"abstract":"<div><div>Fossil teeth from the middle Cretaceous (Albian–Cenomanian) Açu Formation of the Potiguar Basin, Northeastern Brazil, previously described as <em>Tribodus</em> sp., are redescribed as a new species of the hybodontiform shark genus <em>Distobatus</em> Werner, 1989. The new taxon, <em>Distobatus potiguarense</em> sp. nov., is based on crown ornamentation, formed by delicate parallel ridges in the form of waves that follow each other, in occlusal view. The presence of <em>Distobatus</em> in the Açu Formation represents the westernmost distribution of this taxon and confirms the taxonomic and environmental similarity between the faunas found in North Africa and Northeastern Brazil. The new species confirms the existence of Distobatidae in South America immediately after the separation of the northern part of Gondwana.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"171 ","pages":"Article 106119"},"PeriodicalIF":1.9,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Latest Albian echinoids from Pénzesgyőr (Bakony Mountains, Transdanubian Range) including the first record of Trochotiara bourgueti (Agassiz, 1840) from Hungary","authors":"László Bujtor ,&nbsp;Marouf A.M. Abdelhamid ,&nbsp;Gamal M.E. El Qot ,&nbsp;Gabriella Földvári","doi":"10.1016/j.cretres.2025.106100","DOIUrl":"10.1016/j.cretres.2025.106100","url":null,"abstract":"<div><div>Glauconitic, condensed beds of uppermost Albian (<em>Arrhaphoceras (Praeschloenbachia) briacense</em>/<em>Pervinquieria perinflata</em> zones) at Tilos forest, Pénzesgyőr, Transdanubian Range, AlCaPa (=Alpine-Carpathian-Pannonian) tectonic unit in Hungary have yielded a rich fossil assemblage. It comprises mostly fragmentary ammonites, well-preserved echinoids, less abundant bivalves, gastropods, belemnites, and rare brachiopods and nautiloids. Amongst echinoids, five species have been distinguished (<em>Camerogalerus conica</em>, <em>Catopygus neocylindricus</em>, <em>Holaster laevis</em>, <em>Hemiaster minimus</em>, and <em>Trochotiara bourgueti</em>). The assemblage is dominated by <em>Camerogalerus conicus</em> and <em>Catopygus neocylindricus</em>. <em>Trochotiara bourgueti</em> is recorded for the first time from Hungary extending its stratigraphical range to the uppermost Albian. <em>Hemiaster minimus</em> is documented for the first time from Hungary. The palaeobiogeography, taphonomy and microfacies have been discussed. Palaeobiogeographical analysis of the reported echinoid species and some selected ammonite genera revealed similar distribution patterns for the Bakony Mountains indicating a transitional area and mixing zone for the northern and southern Tethyan taxa.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"171 ","pages":"Article 106100"},"PeriodicalIF":1.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Albian–early Turonian calcareous nannofossils from southern Tibet — Implications for preservation, biostratigraphy and palaeoecology","authors":"Meiling Han ,&nbsp;Gang Li ,&nbsp;Ulrich Heimhofer ,&nbsp;Jörg Mutterlose","doi":"10.1016/j.cretres.2025.106101","DOIUrl":"10.1016/j.cretres.2025.106101","url":null,"abstract":"<div><div>Marine strata of Cretaceous age are widely distributed and well exposed in the Gamba area of South Tibet. A pre-requisite for understanding the depositional and palaeoenvironmental processes, which formed these deposits, is a reliable stratigraphic framework. The strata of the Qiangdong section in the Gamba area yielded calcareous nannofossils which provide a powerful tool for establishing a detailed biostratigraphic subdivision. They also allow for supra-regional correlation, ideally on a global scale. The current study investigates the preservational state and stratigraphic significance of calcareous nannofossils from 63 samples. A total of 76 species have been identified in the 159 m thick section, allowing for the recognition of seven bioevents (calcareous nannofossil zones UC0 to UC7) covering the upper Albian–lower Turonian interval. The first occurrences of the calcareous nannofossil marker species <em>Corollithion kennedyi</em> (base UC1a, 100.5 Ma) and <em>Quadrum intermedium</em> (base UC5c, 94.1 Ma) constrain the Albian/Cenomanian and Cenomanian/Turonian boundaries in the Qiangdong section. A regional comparison with findings from the Tingri area, about 150 km west of the studied section, enhances the precision of biostratigraphic correlations in South Tibet. The findings emphasize that preservation and diagenetic influence need to be critically considered when interpreting nannofossil assemblages for palaeoenvironmental reconstructions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"171 ","pages":"Article 106101"},"PeriodicalIF":1.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unique conifer assemblage from Late Jurassic-Early Cretaceous deposits (NE Brazil) unveils the paleoclimate and paleobiogeography in the interior of equatorial Gondwana","authors":"Domingas Maria da Conceição ,&nbsp;Mário G.F. Esperança Júnior ,&nbsp;William V. Gobo ,&nbsp;Roberto Iannuzzi ,&nbsp;Maria E.P. Batista ,&nbsp;Daniel Rodrigues do Nascimento Jr. ,&nbsp;Wellington Ferreira da Silva Filho ,&nbsp;Rodrigo Scalise Horodysk ,&nbsp;Marion K. Bamford ,&nbsp;Lutz Kunzmann","doi":"10.1016/j.cretres.2025.106099","DOIUrl":"10.1016/j.cretres.2025.106099","url":null,"abstract":"<div><div>The Brazilian paleoxyloflora conspicuously lacks a robust Late Jurassic-Early Cretaceous record. However, several fossil woods have been reported since the 18th century from the Upper Jurassic to Lower Cretaceous deposits of Missão Velha Formation, Araripe Basin, northeastern Brazil, although no taxonomic and systematic analysis has been carried out so far. Here, we provide the first taxonomic and systematic study of these fossil woods, utilizing them for paleoclimatic and paleobiogeographic inferences for this region in equatorial Gondwana. We thus describe a new fossil-species, <em>Metapodocarpoxylon brasiliense</em>, and document, for the first time, the presence of <em>Agathoxylon mendezii</em> in Brazil. They are distinguished by characters of radial pit arrangement, cross-field pits, presence of resin plugs, axial parenchyma, septate tracheids, and ray seriation and height. These fossil-genera have been previously observed in other Mesozoic paleoxylofloras of Gondwana, being <em>Metapodocarpoxylon,</em> in particular, restricted to the tropical belt and coastal areas, and its occurrence in Brazilian paleofloras is unknown to date. Its new occurrence suggests a migration of this element of the paleovegetation towards inland areas likely triggered by paleoclimatic changes from the Late Jurassic onwards. The presence of indistinct and distinct growth rings with narrow latewood in the conifer assemblage suggests a moderately seasonal paleoclimate with rainy and dry seasons, which is also supported by the geological data, probably stimulated by the monsoonal regime in the basinal area. The new wood records, combined with geological and paleoclimatological background information and palynological data obtained from the study area in the early 2000’s allowed for a preliminary reconstruction of a segment of the landscape during deposition of the Missão Velha Formation.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"170 ","pages":"Article 106099"},"PeriodicalIF":1.9,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Angiosperm radiation, diversification, and vegetation shifts through the Albian–Cenomanian of the northern Iberian Peninsula: Palynological evidence from the Las Loras UNESCO Global Geopark","authors":"Iván Rodríguez-Barreiro ,&nbsp;Artai A. Santos ,&nbsp;Uxue Villanueva-Amadoz ,&nbsp;Jose M. Hernández ,&nbsp;Stephen McLoughlin ,&nbsp;José B. Diez","doi":"10.1016/j.cretres.2025.106086","DOIUrl":"10.1016/j.cretres.2025.106086","url":null,"abstract":"<div><div>During the mid-Cretaceous (Aptian–Turonian), angiosperms diversified and expanded their range significantly, but were potentially affected by several environmental crises. The Iberian Peninsula is particularly relevant to studies of paleobotanical events through this interval owing to its intermediate position between Gondwanan and Laurasian floral provinces and its wealth of assemblages containing early angiosperms. The Las Loras UNESCO Global Geopark is a unique area for paleobotanical studies of the mid-Cretaceous in the Basque-Cantabrian Basin, which currently has a depauperate record of floral evolution through this interval. Our palynostratigraphical results have clarified the chronostratigraphic positions and improved correlation of various formations in the Las Loras region. These results assign the Escucha Formation to the lower–upper Albian, the Santa María de las Hoyas Formation to the middle Cenomanian with diachronous (upper Cenomanian) deposits towards the west, and the Abejar Formation to the lowermost upper Cenomanian. Our new paleoecological results and a review of previous palynological data reveal notable changes in plant communities in the Iberian Peninsula through the Albian–Cenomanian. A conifer-dominated flora prevailed through the early–middle Albian but a shift to more diverse communities with increased presence of angiosperms typified the late Albian–early Cenomanian. The middle Cenomanian was characterized by conifer dominance but with expanded angiosperm diversity marked by the first occurrence of the Normapolles group. Finally, the late Cenomanian featured sporadic dominance by angiosperms, particularly the Normapolles group, in deposits associated with the Oceanic Anoxic Event 2.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"170 ","pages":"Article 106086"},"PeriodicalIF":1.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Age and palaeoenvironmental constraints on the earliest dinosaur-bearing strata of the Densuș-Ciula Formation (Hațeg Basin, Romania): Evidence of their late Campanian-early Maastrichtian syntectonic deposition","authors":"Gáspár Albert ,&nbsp;Soma Budai ,&nbsp;Zoltán Csiki-Sava ,&nbsp;László Makádi ,&nbsp;Daniel Ţabără ,&nbsp;Valentin Árvai ,&nbsp;Ramona Bălc ,&nbsp;Raluca Bindiu-Haitonic ,&nbsp;Mihai N. Ducea ,&nbsp;Gábor Botfalvai","doi":"10.1016/j.cretres.2025.106095","DOIUrl":"10.1016/j.cretres.2025.106095","url":null,"abstract":"<div><div>The Haţeg Basin is famous for its rich uppermost Cretaceous continental vertebrate assemblages, with some of the most important ones originating from the Densuş-Ciula Formation. The present study aims to provide a more accurate picture of the geological and palaeoenvironmental context of this important dinosaur-bearing succession through complex spatial analysis based on detailed geological mapping combined with results of zircon U–Pb geochronology, sedimentology, vertebrate palaeontology and micropalaeontology investigations. This integrated stratigraphical survey revealed that the important environmental shift from marine to continental deposition in western Haţeg Basin occurred significantly earlier (by middle late Campanian) than hitherto considered, and that the lower Densuș-Ciula Formation – previously thought to be restricted to the Maastrichtian – covers a good part of the upper Campanian as well. Sedimentological investigations, aimed to characterize palaeoenvironmental changes during basin evolution, identify two, vertically superimposed fining-upward successions within the lower Densuș-Ciula Formation, reconstructed as alluvial fan environments linked to distinct stages of basin tectonic evolution. Contrary to previous interpretations as a post-orogenic molasse, the lower Densuș-Ciula Formation is here re-interpreted as a largely syntectonic unit deposited in a transtensional, dextral strike-slip basin initiated during the late Campanian. The stratigraphic positions and palaeoenvironmental settings of all major vertebrate sites from this area are re-assessed using our new age constraints and improved tectonic-stratigraphic-sedimentologic framework, documenting a significantly earlier start of the accumulation of vertebrate-bearing deposits than thought before, and challenging previous ideas about the timing of assembly, isolation and evolution of the Haţeg Island faunas.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"170 ","pages":"Article 106095"},"PeriodicalIF":1.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First record of the Mesozoic gymnosperm Xenoxylon Gothan in the Lower Cretaceous of northwestern China: New insights for its global paleobiogeography","authors":"Aowei Xie ,&nbsp;Hongyu Chen ,&nbsp;Xiao Teng ,&nbsp;Min Xu ,&nbsp;Yanbin Zhu ,&nbsp;Zikun Jiang ,&nbsp;Yongdong Wang ,&nbsp;Dieter Uhl","doi":"10.1016/j.cretres.2025.106098","DOIUrl":"10.1016/j.cretres.2025.106098","url":null,"abstract":"<div><div>Fossil wood serves as a crucial proxy for understanding terrestrial vegetation composition and reconstructing continental paleogeography throughout Earth’s history. The notable gymnosperm wood, <em>Xenoxylon</em> Gothan, is commonly found in the Mesozoic deposits across the Northern Hemisphere. In China, about 80 occurrences of this genus are documented in the eastern regions. However, limited occurrences are so far reported in the Mesozoic deposits of western China. Here, we describe new fossil wood specimens from the Lower Cretaceous of the Jiuquan Basin in Yumen City of Gansu Province, northwestern China. The fossils are characterized by the distinctive anatomy of <em>Xenoxylon</em>, including xenoxylean radial tracheid pitting and window-like cross-field pitting. Based on the characters of radial tracheid pits, cross-field pits, and ray heights, the fossils are recognized as <em>Xenoxylon meisteri</em> Palibin et Jarmolenko. To better understand the paleobiogeography of the Mesozoic <em>Xenoxylon</em>, a global survey of its occurrences is carried out, which reveals that <em>Xenoxylon</em> expanded its range both towards higher and lower latitudes from the Triassic to the Jurassic, then reduced its range northward in the Cretaceous. The results of this study corroborate that <em>Xenoxylon</em>-type trees were more likely to inhabit higher latitudes of the Northern Hemisphere (&gt;30° N).</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106098"},"PeriodicalIF":1.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A long-handed new ornithomimid dinosaur from the Campanian (Upper Cretaceous) Cerro del Pueblo Formation, Coahuila, Mexico","authors":"Claudia Inés Serrano-Brañas ,&nbsp;Belinda Espinosa-Chávez ,&nbsp;Claudio de León-Dávila ,&nbsp;S. Augusta Maccracken ,&nbsp;Daniela Barrera-Guevara ,&nbsp;Esperanza Torres-Rodríguez ,&nbsp;Albert Prieto-Márquez","doi":"10.1016/j.cretres.2025.106087","DOIUrl":"10.1016/j.cretres.2025.106087","url":null,"abstract":"<div><div>New ornithomimosaur material discovered from the Upper Cretaceous Cerro del Pueblo Formation (CdP) of Coahuila, Mexico represents a new genus and species of Ornithomimidae. The new taxon, <em>Mexidracon longimanus</em> sp. nov., is represented by an individual preserving axial and appendicular elements. <em>M. longimanus</em> is characterised by the following combination of characters: extreme lengthening of the metacarpals that are longer than the metatarsals, proximal end of metacarpal II with a narrow subtriangular outline, a pubic peduncle of the ilium with a flared, zig-zag articular margin that is wider anteriorly than posteriorly and an ischiadic peduncle that is similar in size to the pubic peduncle, a pubic boot where the distal margin of the anterior expansion is separated from the shaft by a deep notch, a femur that is slightly longer than the tibia, an arctometatarsalian pes, a metatarsal II that has a D-shaped cross-section, and a metatarsal IV longer than metatarsal II, among other features. A phylogenetic analysis places <em>M. longimanus</em> within Ornithomimidae forming a polytomic relationship with other members of this clade. The finding of <em>M. longimanus</em> adds to the increasing diversity and paleobiogeographic distribution of the group during the Campanian of southern Laramidia. The ornithomimosaur record of the CdP represents yet another instance of the coexistence of ornithomimids and deinocheirids spanning a wide range of body sizes within this clade of ‘ostrich’ dinosaurs.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106087"},"PeriodicalIF":1.9,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Valanginian and Hauterivian bochianitid ammonoids from the Rosa Blanca Formation of Colombia: Palaeobiogeographic implications","authors":"Edwin-Alberto Cadena ,&nbsp;Jonatan Bustos ,&nbsp;Jens Lehmann","doi":"10.1016/j.cretres.2025.106094","DOIUrl":"10.1016/j.cretres.2025.106094","url":null,"abstract":"<div><div>The Lower Cretaceous record of heteromorph ammonoids in northern South America is still poorly known, occurrences are often mentioned only without detailed analysis of their morphology and palaeobiogeographic implications. Here, we describe the first occurrence of <em>Bochianites neocomiensis</em> from the Valanginian of northern South America. This finding is from the upper Valanginian section of the Carrizal Member of the Rosa Blanca Formation. It underlines the meaning of high amplitude late Valanginian sea level rise, and related opening of migration routes, as part of the Weissert Event. Additionally, we identify <em>Janenschites oosteri</em> from the lower Hauterivian El Sapo Member, also within the Rosa Blanca Formation in the Zapatoca region of Colombia. The presence of <em>B. neocomiensis</em> and <em>J. oosteri</em> in Colombia broadens the palaeobiogeographical record for these species to northern South America, both trace the improving migration routes for ammonoids along the margins of the South American continent during the course of the Early Cretaceous.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106094"},"PeriodicalIF":1.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}