Cretaceous Research最新文献

Unique conifer assemblage from Late Jurassic-Early Cretaceous deposits (NE Brazil) unveils the paleoclimate and paleobiogeography in the interior of equatorial Gondwana

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-02-04 DOI: 10.1016/j.cretres.2025.106099

Domingas Maria da Conceição , Mário G.F. Esperança Júnior , William V. Gobo , Roberto Iannuzzi , Maria E.P. Batista , Daniel Rodrigues do Nascimento Jr. , Wellington Ferreira da Silva Filho , Rodrigo Scalise Horodysk , Marion K. Bamford , Lutz Kunzmann

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, Metapodocarpoxylon brasiliense, and document, for the first time, the presence of Agathoxylon mendezii 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 Metapodocarpoxylon, 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.

{"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 , Mário G.F. Esperança Júnior , William V. Gobo , Roberto Iannuzzi , Maria E.P. Batista , Daniel Rodrigues do Nascimento Jr. , Wellington Ferreira da Silva Filho , Rodrigo Scalise Horodysk , Marion K. Bamford , 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}

引用次数: 0

Angiosperm radiation, diversification, and vegetation shifts through the Albian–Cenomanian of the northern Iberian Peninsula: Palynological evidence from the Las Loras UNESCO Global Geopark

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-31 DOI: 10.1016/j.cretres.2025.106086

Iván Rodríguez-Barreiro , Artai A. Santos , Uxue Villanueva-Amadoz , Jose M. Hernández , Stephen McLoughlin , José B. Diez

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.

{"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 , Artai A. Santos , Uxue Villanueva-Amadoz , Jose M. Hernández , Stephen McLoughlin , 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}

引用次数: 0

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

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-30 DOI: 10.1016/j.cretres.2025.106095

Gáspár Albert , Soma Budai , Zoltán Csiki-Sava , László Makádi , Daniel Ţabără , Valentin Árvai , Ramona Bălc , Raluca Bindiu-Haitonic , Mihai N. Ducea , Gábor Botfalvai

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.

{"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 , Soma Budai , Zoltán Csiki-Sava , László Makádi , Daniel Ţabără , Valentin Árvai , Ramona Bălc , Raluca Bindiu-Haitonic , Mihai N. Ducea , 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}

引用次数: 0

First record of the Mesozoic gymnosperm Xenoxylon Gothan in the Lower Cretaceous of northwestern China: New insights for its global paleobiogeography

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-30 DOI: 10.1016/j.cretres.2025.106098

Aowei Xie , Hongyu Chen , Xiao Teng , Min Xu , Yanbin Zhu , Zikun Jiang , Yongdong Wang , Dieter Uhl

Fossil wood serves as a crucial proxy for understanding terrestrial vegetation composition and reconstructing continental paleogeography throughout Earth’s history. The notable gymnosperm wood, Xenoxylon 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 Xenoxylon, 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 Xenoxylon meisteri Palibin et Jarmolenko. To better understand the paleobiogeography of the Mesozoic Xenoxylon, a global survey of its occurrences is carried out, which reveals that Xenoxylon 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 Xenoxylon-type trees were more likely to inhabit higher latitudes of the Northern Hemisphere (>30° N).

{"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 , Hongyu Chen , Xiao Teng , Min Xu , Yanbin Zhu , Zikun Jiang , Yongdong Wang , 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 (>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}

引用次数: 0

A long-handed new ornithomimid dinosaur from the Campanian (Upper Cretaceous) Cerro del Pueblo Formation, Coahuila, Mexico

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-28 DOI: 10.1016/j.cretres.2025.106087

Claudia Inés Serrano-Brañas , Belinda Espinosa-Chávez , Claudio de León-Dávila , S. Augusta Maccracken , Daniela Barrera-Guevara , Esperanza Torres-Rodríguez , Albert Prieto-Márquez

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, Mexidracon longimanus sp. nov., is represented by an individual preserving axial and appendicular elements. M. longimanus 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 M. longimanus within Ornithomimidae forming a polytomic relationship with other members of this clade. The finding of M. longimanus 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.

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引用次数: 0

Valanginian and Hauterivian bochianitid ammonoids from the Rosa Blanca Formation of Colombia: Palaeobiogeographic implications

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-24 DOI: 10.1016/j.cretres.2025.106094

Edwin-Alberto Cadena , Jonatan Bustos , Jens Lehmann

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 Bochianites neocomiensis 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 Janenschites oosteri from the lower Hauterivian El Sapo Member, also within the Rosa Blanca Formation in the Zapatoca region of Colombia. The presence of B. neocomiensis and J. oosteri 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.

人们对南美洲北部下白垩世异形类群的记录仍然知之甚少，往往只提及出现过的类群，而未对其形态和古生物地理意义进行详细分析。在这里，我们描述了南美洲北部瓦朗基尼期首次出现的 Bochianites neocomiensis。这一发现来自罗萨布兰卡地层 Carrizal 成员的瓦朗基尼上段。它强调了瓦朗基尼晚期海平面高幅度上升的意义，以及作为魏塞特事件一部分的相关迁徙路线的开辟。此外，我们还在哥伦比亚萨帕托卡地区的罗萨布兰卡地层中的下豪特里维世埃尔萨波岩层中发现了 Janenschites oosteri。在哥伦比亚发现的 B. neocomiensis 和 J. oosteri 拓宽了这些物种在南美洲北部的古生物地理记录，它们都追溯了早白垩世期间南美洲大陆边缘氨甲类动物不断改善的迁徙路线。

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引用次数: 0

A curious Cretaceous eremochaetid fly (Diptera, Brachycera, Eremochaetidae) with discussion of the evolution of wing venation and competitive mechanisms between related groups

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-20 DOI: 10.1016/j.cretres.2025.106085

Qingqing Zhang , Junfeng Zhang , Qi Zhang

An impression fossil of an eremochaetid fly from Lower Cretaceous Laiyang Formation is described and a new genus and species is proposed: Guamaimengia laiyangensis gen. et sp. nov. The evolution of wing venation in Eremochaetidae is discussed. The relationships between Eremochaetidae and Archisargidae are reviewed and reassessed: they are not only sister groups but probably play a role in the species-abundant checks and balances at one and the same locality. The conclusion of competitive mechanisms between extinct groups is proposed.

引用次数: 0

A new marine vertebrate assemblage from the Upper Cretaceous Dakota Formation in Nebraska, USA, and its paleoecology and taphonomy

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-20 DOI: 10.1016/j.cretres.2025.106084

John K. Juranek , Kenshu Shimada

The upper part of the Dakota Formation (lower part of middle Cenomanian) is a marine sedimentary rock unit formed at the dawn of the major transgression of the Late Cretaceous Western Interior Seaway of North America. In this study, remains of marine vertebrates from a fossiliferous bed in the stratigraphic horizon in southeastern Nebraska were examined, which resulted in a collection of over 7292 taxonomically identifiable specimens, consisting minimally of 51 distinct vertebrate taxa. They include at least 26 chondrichthyans, 20 osteichthyan fishes, and five tetrapod taxa, many of which mark the first occurrence in the Cretaceous of Nebraska. The vertebrate assemblage is represented primarily by many small piscivorous pelagic fishes (e.g., cf. Stratodus, Enchodus, and Pachyrhizodus) and durophagous benthic fishes (e.g., Rhinobatos, Pseudohypolophus, Ischyrhiza, cf. Hadrodus, cf. Palaeobalistum, and Albulidae indet.) as well as a small squamate (Coniasaurus) and a diving bird (hesperornithiform). It also includes multiple medium–large predatory pelagic fishes (e.g., Haimirchia, Protolamna, Cretodus, Cardabiodon, Cretoxyrhina, Archaeolamna, Cretalamna, and Protosphyraena) as well as plesiosaurs, that are thought to have occupied the highest trophic positions in their ecosystem. This study is significant because it represents the first formal account of the vertebrate assemblage from the Dakota Formation. Although the fossil assemblage may be time-averaged for possibly as much as 50,000 years timespan, it offers a glimpse into the paleoecology of a nearshore, shallow marine environment during the early part of the middle Cenomanian representing the initial phase of a major transgression of the Western Interior Seaway.

{"title":"A new marine vertebrate assemblage from the Upper Cretaceous Dakota Formation in Nebraska, USA, and its paleoecology and taphonomy","authors":"John K. Juranek , Kenshu Shimada","doi":"10.1016/j.cretres.2025.106084","DOIUrl":"10.1016/j.cretres.2025.106084","url":null,"abstract":"<div><div>The upper part of the Dakota Formation (lower part of middle Cenomanian) is a marine sedimentary rock unit formed at the dawn of the major transgression of the Late Cretaceous Western Interior Seaway of North America. In this study, remains of marine vertebrates from a fossiliferous bed in the stratigraphic horizon in southeastern Nebraska were examined, which resulted in a collection of over 7292 taxonomically identifiable specimens, consisting minimally of 51 distinct vertebrate taxa. They include at least 26 chondrichthyans, 20 osteichthyan fishes, and five tetrapod taxa, many of which mark the first occurrence in the Cretaceous of Nebraska. The vertebrate assemblage is represented primarily by many small piscivorous pelagic fishes (e.g., cf. <em>Stratodus</em>, <em>Enchodus</em>, and <em>Pachyrhizodus</em>) and durophagous benthic fishes (e.g., <em>Rhinobatos</em>, <em>Pseudohypolophus</em>, <em>Ischyrhiza</em>, cf. <em>Hadrodus</em>, cf. <em>Palaeobalistum</em>, and Albulidae indet.) as well as a small squamate (<em>Coniasaurus</em>) and a diving bird (hesperornithiform). It also includes multiple medium–large predatory pelagic fishes (e.g., <em>Haimirchia</em>, <em>Protolamna</em>, <em>Cretodus</em>, <em>Cardabiodon</em>, <em>Cretoxyrhina</em>, <em>Archaeolamna</em>, <em>Cretalamna</em>, and <em>Protosphyraena</em>) as well as plesiosaurs, that are thought to have occupied the highest trophic positions in their ecosystem. This study is significant because it represents the first formal account of the vertebrate assemblage from the Dakota Formation. Although the fossil assemblage may be time-averaged for possibly as much as 50,000 years timespan, it offers a glimpse into the paleoecology of a nearshore, shallow marine environment during the early part of the middle Cenomanian representing the initial phase of a major transgression of the Western Interior Seaway.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106084"},"PeriodicalIF":1.9,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143348744","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}

引用次数: 0

Coupled U–Pb and Lu–Hf zircon data of the marine Pilmatué Member, Agrio Formation: Implications for sedimentary provenance and source areas across the Early Cretaceous in the Neuquén Basin, Argentina

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-15 DOI: 10.1016/j.cretres.2025.106083

Francisco I. Lugo , Marcos A. Comerio , Carlos A. Ballivián Justiniano , Jonatan A. Arnol , Julián D. Rolan , Pablo J. Pazos , Miguel A.S. Basei

The Lower Cretaceous Neuquén Basin is characterized by an almost complete stratigraphic record with marine and continental successions that have been addressed from the perspective of compositional and provenance analyses. However, determination of source areas through geological time is still a matter of debate. This work focuses in the upper Valanginian–lower Hauterivian Pilmatué Member (Agrio Formation of the Mendoza Group), a marine unit that represents shallow to offshore settings mainly composed of mudstones. In order to study the provenance and source areas, outcrop samples were examined through petrography, X-ray diffraction, and U–Pb/Lu–Hf zircon analyses. Sandstone deposits are scarce in the unit and show high compositional maturity related to fine-grained sediments preserved during transport until their final deposition. In the Pilmatué Member, the clay fraction is dominated by detrital illite and chlorite derived from the erosion of plutonic/metasedimentary basement rocks likely subjected to arid–semi-arid climate in the hinterland. Four main U–Pb age populations were determined: (1) Mesoproterozoic–Neoproterozoic, (2) Cambrian–Ordovician, (3) Permian–Triassic, and (4) Early–Middle Jurassic, which indicate an important denudation of old igneous-metamorphic basement rocks not recorded in the underlying Upper Jurassic and Lower Cretaceous units. A detailed compilation of the limited U–Pb/Lu–Hf zircon data from Upper Jurassic and Lower Cretaceous units reinforce the ideas that hinterland source regions located adjacent to the basin boundaries were the main source of clastic detritus. Since U–Pb ages show little variations across late Valanginian–Albian times, sediment transfer zones seem to have been stable during the closure of the back-arc basin stage.

{"title":"Coupled U–Pb and Lu–Hf zircon data of the marine Pilmatué Member, Agrio Formation: Implications for sedimentary provenance and source areas across the Early Cretaceous in the Neuquén Basin, Argentina","authors":"Francisco I. Lugo , Marcos A. Comerio , Carlos A. Ballivián Justiniano , Jonatan A. Arnol , Julián D. Rolan , Pablo J. Pazos , Miguel A.S. Basei","doi":"10.1016/j.cretres.2025.106083","DOIUrl":"10.1016/j.cretres.2025.106083","url":null,"abstract":"<div><div>The Lower Cretaceous Neuquén Basin is characterized by an almost complete stratigraphic record with marine and continental successions that have been addressed from the perspective of compositional and provenance analyses. However, determination of source areas through geological time is still a matter of debate. This work focuses in the upper Valanginian–lower Hauterivian Pilmatué Member (Agrio Formation of the Mendoza Group), a marine unit that represents shallow to offshore settings mainly composed of mudstones. In order to study the provenance and source areas, outcrop samples were examined through petrography, X-ray diffraction, and U–Pb/Lu–Hf zircon analyses. Sandstone deposits are scarce in the unit and show high compositional maturity related to fine-grained sediments preserved during transport until their final deposition. In the Pilmatué Member, the clay fraction is dominated by detrital illite and chlorite derived from the erosion of plutonic/metasedimentary basement rocks likely subjected to arid–semi-arid climate in the hinterland. Four main U–Pb age populations were determined: (1) Mesoproterozoic–Neoproterozoic, (2) Cambrian–Ordovician, (3) Permian–Triassic, and (4) Early–Middle Jurassic, which indicate an important denudation of old igneous-metamorphic basement rocks not recorded in the underlying Upper Jurassic and Lower Cretaceous units. A detailed compilation of the limited U–Pb/Lu–Hf zircon data from Upper Jurassic and Lower Cretaceous units reinforce the ideas that hinterland source regions located adjacent to the basin boundaries were the main source of clastic detritus. Since U–Pb ages show little variations across late Valanginian–Albian times, sediment transfer zones seem to have been stable during the closure of the back-arc basin stage.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106083"},"PeriodicalIF":1.9,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180220","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}

引用次数: 0

New fish remains from the Araçatuba and Adamantina formations (Upper Cretaceous), Bauru Group, southwestern São Paulo State

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-13 DOI: 10.1016/j.cretres.2025.106078

Patrícia Fabiana Rodrigues Costa , Joyce Celerino de Carvalho , William Roberto Nava , Rodrigo Miloni Santucci

The paleoichthyofauna of the Bauru Group is generally represented by isolated remains. This fossil record includes actinopterygians such as Lepisosteidae, Amiidae, Osteoglossiformes, Characiformes, Siluriformes, and a few Dipnoi occurrences. However, given the scarcity of more complete specimens, the Bauru Group fish diversity is poorly known when compared to other vertebrate groups of the same unit. We report new fish remains, including scales and skull fragments, from the lacustrine Araçatuba Formation and the fluvial Adamantina Formation from the Presidente Prudente region (cities of Coronel Goulart and Pirapozinho), State of São Paulo. Some skull remains were analyzed by microtomography and the ganoid scales were studied by morphometric, thin sectioning, and SEM analyses. The cycloid scales of the Bauru Group have not yet been sufficiently investigated due to the incompleteness of the material found so far. Therefore, we better characterize new cycloid scale findings with the aid of comparisons with extant taxa, which indicate that some of them can be assigned to Characiformes. We also report a dentary attributed to the genus Atractosteus (Lepisosteidae) based on unique features such as robust conical teeth with well-developed plicidentine, and the absence of a row of smaller lateral teeth. The underdeveloped morphology of the mandibular canal indicates that this is a juvenile specimen. The paleoichthyofauna of both formations are similar, with remains of Characiformes and Siluriformes showing nearly the same morphology. Lepisosteidae remains are also alike, including the presence of the genus Atractosteus. The remains of Lepisosteidae are the most abundant material found in both units, indicating either this was the predominant group of fish in the Bauru Group or that their remains are easily preserved, as ganoid scales are much more resistant to transportation than cycloid scales.

{"title":"New fish remains from the Araçatuba and Adamantina formations (Upper Cretaceous), Bauru Group, southwestern São Paulo State","authors":"Patrícia Fabiana Rodrigues Costa , Joyce Celerino de Carvalho , William Roberto Nava , Rodrigo Miloni Santucci","doi":"10.1016/j.cretres.2025.106078","DOIUrl":"10.1016/j.cretres.2025.106078","url":null,"abstract":"<div><div>The paleoichthyofauna of the Bauru Group is generally represented by isolated remains. This fossil record includes actinopterygians such as Lepisosteidae, Amiidae, Osteoglossiformes, Characiformes, Siluriformes, and a few Dipnoi occurrences. However, given the scarcity of more complete specimens, the Bauru Group fish diversity is poorly known when compared to other vertebrate groups of the same unit. We report new fish remains, including scales and skull fragments, from the lacustrine Araçatuba Formation and the fluvial Adamantina Formation from the Presidente Prudente region (cities of Coronel Goulart and Pirapozinho), State of São Paulo. Some skull remains were analyzed by microtomography and the ganoid scales were studied by morphometric, thin sectioning, and SEM analyses. The cycloid scales of the Bauru Group have not yet been sufficiently investigated due to the incompleteness of the material found so far. Therefore, we better characterize new cycloid scale findings with the aid of comparisons with extant taxa, which indicate that some of them can be assigned to Characiformes. We also report a dentary attributed to the genus <em>Atractosteus</em> (Lepisosteidae) based on unique features such as robust conical teeth with well-developed plicidentine, and the absence of a row of smaller lateral teeth. The underdeveloped morphology of the mandibular canal indicates that this is a juvenile specimen. The paleoichthyofauna of both formations are similar, with remains of Characiformes and Siluriformes showing nearly the same morphology. Lepisosteidae remains are also alike, including the presence of the genus <em>Atractosteus</em>. The remains of Lepisosteidae are the most abundant material found in both units, indicating either this was the predominant group of fish in the Bauru Group or that their remains are easily preserved, as ganoid scales are much more resistant to transportation than cycloid scales.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106078"},"PeriodicalIF":1.9,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180217","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}

引用次数: 0