Palaeoworld最新文献

{"title":"Chemostratigraphy of Albian deposits in northern Tunisia: Identification of early Albian Oceanic Anoxic Event in the southern Tethys","authors":"Salma Soussi ,&nbsp;Fares Khemiri ,&nbsp;Amina Mabrouk El Asmi ,&nbsp;Moez Ben Fadhel ,&nbsp;Habib Troudi ,&nbsp;Khaled El Asmi ,&nbsp;Gonzalo Márquez Martinez","doi":"10.1016/j.palwor.2025.200980","DOIUrl":"10.1016/j.palwor.2025.200980","url":null,"abstract":"<div><div>An integrated analysis of multiple geochemical proxies, including δ¹³C_org, total organic carbon (TOC), trace elements, and chemical gamma ray, coupled with a microfacies study and an age calibration using planktonic foraminiferal markers, was conducted at the Ain Asker section in northern Tunisia. This study provides significant insights into the depositional and paleoenvironmental dynamics of the mid-Cretaceous.</div><div>The carbon isotopic excursions observed at the Ain Asker section reflect a notable increase in the burial rate of marine organic carbon, specifically confined to the middle part of the <em>Microhedbergella rischi</em> biozone. TOC values recorded from the F2-ASK unit reach up to 2.3% combined with a δ¹³C_org values reaching -24.49‰, suggesting substantial accumulation of decayed marine organic matter. Although full anoxic conditions were not prevalent during deposition, evidence of oxygen-depleted bottom waters is clearly supported by the distribution patterns of redox-sensitive trace elements, such as vanadium and nickel. These findings underscore the role of partial oxygen restriction in facilitating organic matter preservation.</div><div>The enhanced burial of organic carbon is attributed to increased nutrient influx, likely driven by global sea-level transgressions and heightened surface productivity. These processes created favorable conditions for organic matter production and preservation. The integration of these sedimentological and geochemical findings with comparative records from Europe (France and Italy), China, and Mexico enables reliable correlation with the Paquier black shale level, a hallmark of OAE1b.</div><div>The Ain Asker section, through its detailed geochemical and isotopic signatures, emerges as a critical reference section for unraveling mid-Cretaceous anoxia dynamics within the southern Tethyan Realm. Its study enhances our understanding of the interplay between global paleoceanographic events and local depositional processes, shedding light on the mechanisms of organic carbon burial during a pivotal period in Earth’s history.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200980"},"PeriodicalIF":1.7,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128373","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":"Microclots in early Paleoproterozoic stromatolites from Dashiling Formation, Wutai, North China: Implications for microbial calcification and atmospheric CO2 levels during Great Oxidation Event","authors":"Zhao-Yang Yi ,&nbsp;Zhen Yan ,&nbsp;Xin Wei ,&nbsp;Kai Wang ,&nbsp;Bing Shen ,&nbsp;Jian-Bo Liu","doi":"10.1016/j.palwor.2025.200969","DOIUrl":"10.1016/j.palwor.2025.200969","url":null,"abstract":"<div><div>The relationship between microbial calcification and atmospheric CO₂ levels is a critical aspect of Earth’s biogeochemical evolution. This study presents the first detailed investigation of micro- and mesoscopic features of stromatolites from the 2.1 Ga Dashiling Formation of the Hutuo Group in Wutai area, North China, one of the best preserved microbialites during the Great Oxidation Event (GOE). The study identifies three types of microclots (microclots-1, -2 and -3) as key contributors to the formation of stromatolitic laminae in the Dashiling Formation. These microclots form layered, meshed, and dendritic microclotted laminae, characterized by alternation of light and dark laminae, with lighter laminae being sparsely distributed and darker laminae densely distributed. These alternations reflect the periodic growth and decay of microbial communities in response to dynamic environmental changes. The microclots and microclotted laminae in the Dashiling Formation exhibit evidence for microbial calcification, suggesting that atmospheric CO₂ levels during the early Paleoproterozoic may have been lower than previously estimated. Previous studies have proposed that microbial calcification occurs extensively only when atmospheric CO₂ declines to ∼10 times the present atmospheric level. The well-preserved microclots and calcified microbial structures in the Dashiling Formation suggest that atmospheric CO₂ levels during the GOE may have approached or fallen below this threshold. While increased atmospheric O₂ levels during the GOE may have influenced microbial calcification, our results indicate that declining CO₂ levels played a more direct role in facilitating carbonate precipitation. These findings refine the understanding of the interplay between microbial activities, atmospheric CO₂ decline, and carbonate saturation during the GOE, offering new insights into early Earth’s carbon cycle dynamics.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200969"},"PeriodicalIF":1.7,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018889","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":"Anatomy and paleoclimatic implications of Cenozoic Coryphoideae palm wood species in Egypt","authors":"Zainab M. El-Noamani,&nbsp;Wagieh E. El-Saadawi,&nbsp;Marwah M. Kamal El-Din,&nbsp;Nermeen A. Ziada","doi":"10.1016/j.palwor.2025.200968","DOIUrl":"10.1016/j.palwor.2025.200968","url":null,"abstract":"<div><div>This study examines 12 well-preserved specimens collected from the Miocene Moghra and Gebel Khashab formations at six sites in the northern part of the Western Desert of Egypt. The results reveal distinct anatomical features for each of the four morphospecies (namely <em>Palmoxylon aschersoni</em> Schenk, <em>P</em>. cf. <em>aschersoni</em> Schenk, <em>P</em>. <em>lacunosum</em> (Unger) Felix, and <em>P</em>. <em>libycum</em> (Stenzel) Kräusel), confirming their identification and classification within the subfamily Coryphoideae. The paleoclimatic conditions for each species are interpreted based on key ecologically-based anatomical traits, such as the number of metaxylem elements and the nature of ground tissue. These findings indicate that the four recorded species reflect different paleoenvironments and depositional conditions, suggesting that they were transported by water from their original growth sites to their current locations, resulting in an intermingling of forest forms in the northern Western Desert. An overview of the fossil record of the subfamily Coryphoideae in Africa is also provided.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200968"},"PeriodicalIF":1.7,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145048730","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":"New conodont fauna from the Floian (Lower Ordovician) Acoite Formation, Cordillera Oriental, Argentina","authors":"E. Kristal Rueda ,&nbsp;Guillermo L. Albanesi ,&nbsp;Gladys Ortega","doi":"10.1016/j.palwor.2025.200967","DOIUrl":"10.1016/j.palwor.2025.200967","url":null,"abstract":"<div><div>This contribution reports a new species, <em>Trapezognathus morenensis</em> n. sp., from the upper levels of the Acoite Formation outcropping in the El Moreno area of the Cordillera Oriental, northwestern Argentina. This species occurs together with <em>Trapezognathus diprion</em>, <em>Costiconus</em> sp., <em>Drepanodus arcuatus</em>, <em>Drepanoistodus costatus</em>, <em>D</em>. <em>forceps</em>, <em>D</em>. <em>pitjanti</em>, <em>Erraticodon patu</em>, <em>Gothodus costulatus</em>, <em>G</em>. <em>andinus</em>, <em>Kallidontus</em> sp., <em>Paltodus subaequalis</em>, <em>Parapanderodus</em> cf. <em>striatus</em>, <em>Paroistodus parallelus</em>, <em>Protopanderodus rectus</em>, <em>Zentagnathus argentinensis</em>, <em>Gothodus</em> spp., and Drepanoistodontid gen. et sp. indet. <em>Trapezognathus morenensis</em> n. sp. exhibits intermediate characteristics between <em>T</em>. <em>diprion</em> and <em>T</em>. <em>quadrangulum</em>, and also displays a close relationship with early species of the genus <em>Baltoniodus</em>. The conodont assemblage allows for the identification of the <em>Gothodus andinus</em> and <em>Trapezognathus diprion</em> zones, indicating a middle to late Floian (Early Ordovician) age. In addition, the boundary between the <em>Gothodus andinus</em> Zone and the succeeding <em>Trapezognathus diprion</em> Zone is defined by the first occurrence datum of <em>Trapezognathus diprion</em> within the same stratigraphic section, representing the first documented instance of this boundary. The revision of associated taxa with reported <em>Trapezognathus</em> spp. suggests that the definition of the Floian–Dapingian boundary still requires verification in the Cordillera Oriental of Argentina.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200967"},"PeriodicalIF":1.7,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145048729","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":"Neogene palaeoenvironments and hydrocarbon potential in the Nile Delta, Egypt: Palynological evidence from an onshore well","authors":"Mennat-Allah T. El Hussieny,&nbsp;Magdy S. Mahmoud,&nbsp;Amr S. Deaf","doi":"10.1016/j.palwor.2025.200966","DOIUrl":"10.1016/j.palwor.2025.200966","url":null,"abstract":"<div><div>Palynological organic matter (POM) of the Neogene succession from the Sidi Salim-1 well, located in the onshore Nile Delta, Egypt (Eastern Mediterranean), suggests a wide range of environments, from deltaic to offshore marine. These environments were discriminated by the overall palynofacies composition, including indicative dinoflagellate cysts, mainly <em>Spiniferites</em> and <em>Selenopemphix</em>. Near-shore marine environment was interpreted for the Middle Miocene (Langhian–Serravallian) Sidi Salim Formation. Deltaic to shallow marine environments were suggested for the Qawasim (Miocene) and Kafr El Sheikh (Pliocene) formations, while the distant (offshore) marine setting was established in the Pliocene Abu Madi Formation. This deeper environment, of the Abu Madi Formation, can be used to confirm a previous documentation of an Early Pliocene progressive drowning of an incised valley, related to the Messinian Salinity Crises (MSC) events, by the late Messinian sea level drop in the Mediterranean. Suboxic to anoxic conditions existed during deposition of the investigated well succession. Anoxia was confirmed by the occurrence of imprints of pyrite crystals across much of the well succession. The occurrence of abundant Poaceae pollen may suggest widespread dry grassland vegetation during deposition of the Neogene sediments of the well. In a regional context, the Neogene environments in the Nile Delta area vary according to the relative position of the investigated sediments, due to structural, palaeogeographic and basinal settings. The recovered palynofacies fluctuated between amorphous organic matter (AOM)-dominated and phytoclast-dominated categories, mostly of the kerogen type II, which is capable of producing oil and gas. The visual assessment of the spore coloration index (SCI) of thin-walled trilete spores in the well section, shows values ranging between 5 and 8, confirming a thermally mature organic matter and, consequently, can be potential source rocks.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200966"},"PeriodicalIF":1.7,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018824","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":"Cretaceous–Paleogene palynodebris from two offshore cores in Cape Basin, South Atlantic Ocean and their paleoenvironmental implications","authors":"A. Sandersen ,&nbsp;L. Scott ,&nbsp;F.H. Neumann ,&nbsp;E.W. Bergh ,&nbsp;M. Bachari","doi":"10.1016/j.palwor.2025.200965","DOIUrl":"10.1016/j.palwor.2025.200965","url":null,"abstract":"<div><div>Palynodebris in two cores from the western South African margin provides an opportunity for investigating stratigraphical changes across the Cretaceous/Paleogene (K/Pg) boundary and the depositional environments during this interval. Changing palynodebris trends of more than 200 sidewall cores and cuttings, sampled from two offshore ocean borehole sites ca. 243 km apart and situated in the Cape Basin, reflect the regional environmental processes during the Cretaceous and early Cenozoic. Thirteen categories of microscopic structures of palynomorphs and palynodebris (phytoclasts) are identified and recorded. These categories include amorphous organic matter, marine palynomorphs, fresh-water algae, resins, black debris (charcoal), yellow-brown fragments, black-brown fragments (including microscopic charcoal), cuticles, plant tissues, woody material, sporomorphs, and fungal material such as fungal spores, fruit bodies, tubes and filaments. The relative abundances of these organic components from each site were analyzed and compared. Palynodebris compositions and patterns differ between borehole sites over time but also show some similar regional trends, e.g., growing indications of burning from the Late Cretaceous to early Paleocene. The woody component suggests that both offshore sites received similar land-derived Cretaceous and Cenozoic sediments via fluvial transport. Palynodebris was compared to previously published palynological data from the cores, showing shifts in vegetation and climate. Around and shortly after the K/Pg boundary, black debris and yellow-brown debris components fluctuate strongly and could possibly be related more to the transition from the Maastrichtian regressive events than a terminal K/Pg boundary event. Stronger marine influence, as indicated by an increase of marine palynomorphs together with geological evidence of glauconitic sandstone, <em>Inoceramus</em>, other bivalves, and shelly material during the Late Cretaceous and Paleogene, reflects the flooding of the basin. The stratigraphy and depositional environments contribute to a better understanding of conditions associated with the opening of the South Atlantic Ocean.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200965"},"PeriodicalIF":1.7,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018791","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":"Dating of Early Triassic Chaohu Fauna by precise U-Pb age constraints: Temporal calibration of the emergence and first radiation of Mesozoic marine reptiles","authors":"Yi-Nuo Wang ,&nbsp;Da-Yong Jiang ,&nbsp;Ryosuke Motani ,&nbsp;Ming-Tao Yao ,&nbsp;Min Zhou ,&nbsp;Zuo-Yu Sun ,&nbsp;Jian-Dong Huang ,&nbsp;Zhao-Liang Ma","doi":"10.1016/j.palwor.2025.200963","DOIUrl":"10.1016/j.palwor.2025.200963","url":null,"abstract":"<div><div>The emergence time of Mesozoic marine reptiles has been controversial due to poor stratigraphic control and the lack of radiometric age constraints. We report a radiometric age of 248.7 ± 1.0 Ma (2σ), obtained through LA-ICP-MS analysis of the zircon grains sampled from a tuff which is intercalated within the fossiliferous beds of the Chaohu Fauna and layered about 7 m above the lowest fossiliferous bed. This dating confirms the Chaohu Fauna as the oldest known marine reptile fauna in the world with precise and comprehensive age constraints. Integrated with the biostratigraphic data and astrochronological analysis, our results demonstrate that marine reptiles were established at least by 3.2 million years after the Permian–Triassic boundary.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200963"},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018781","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":"Multielement conodont apparatus (Cornudina) from the Lower Triassic of China, revealed by high-resolution X-ray microtomography","authors":"Wu-Jun Xu ,&nbsp;Zuo-Yu Sun ,&nbsp;Shuang Liu ,&nbsp;Cheng Ji ,&nbsp;Hao Lu ,&nbsp;Zhao-Liang Ma ,&nbsp;Fei-Yang Wu ,&nbsp;Shou-Ming Chen ,&nbsp;Jian-Dong Huang","doi":"10.1016/j.palwor.2025.200964","DOIUrl":"10.1016/j.palwor.2025.200964","url":null,"abstract":"<div><div>The apparatus of the coniform conodont genus <em>Cornudina</em> remains equivocal because the previous results were derived from discrete element collections rather than natural assemblages. Four exceptionally preserved natural assemblages collected from bed 719 of the upper Nanlinghu Formation in Majiashan quarry, Chaohu of Hefei City, Anhui Province, East China, were imaged using high-resolution X-ray microtomography. The consistent and repeated patterns of element juxtaposition suggest an apparatus of 15 elements, conforming to the classical 2M-9S-4P skeletal template that comprises three basic morphologies: two breviform dolabrate elements, nine elongate bipennate elements, and four angulate elements. The angulate P₁ and P₂ elements have a distinct cusp, short anterior and posterior processes and the P₂ element is twisted crescent-shaped, which supports a taxonomic assignment to <em>Cornudina breviramulis</em> sensu stricto Koike. Multielement comparisons among <em>Cornudina</em>, <em>Neostrachanognathus</em>, and <em>Hindeodus</em> apparatuses suggest <em>Cornudina</em> and <em>Neostrachanognathus</em> are closely related and possibly derived from <em>Hindeodus</em>. The multi-element comparison between Ordovician ‘complex’ conodont apparatuses (e.g., <em>Paracordylodus</em> and <em>Phragmodus</em>) and Triassic ‘coniform’ apparatuses (e.g., <em>Cornudina</em> and <em>Neostrachanognathus</em>) suggests that the low variation in the elemental forms of the latter is probably a secondary ‘evolution’.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200964"},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018784","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":"New findings in the Permian xyloflora of Carapacha Formation (Argentina)","authors":"Paola Zuliani ,&nbsp;Alexandra Crisafulli ,&nbsp;Ricardo Melchor ,&nbsp;Laura Vallejos Leiz","doi":"10.1016/j.palwor.2025.200962","DOIUrl":"10.1016/j.palwor.2025.200962","url":null,"abstract":"<div><div>The Carapacha Formation consists of two members: the Calencó (lower) and the Urre-Lauquen (upper), dated as Permian based on its glossopterid flora. The formation outcrops in La Pampa Province, near the locality of Puelches, with sediments of continental origin, fluvio-lacustrine in type. This study describes two gymnosperm woods species. One, from the Calencó Member, is a Cordaitalean assigned to <em>Scleromedulloxylon aveyronense</em> found in the Permian of Aveyron, France, characterized by having a heterocellular pith with islands of sclerenchymatic cells and unorganized lacunae in transverse section. The other specimen, from the Urre-Lauquen Member, is a conifer of uncertain affinity, <em>Zalesskioxylon uniseriatum</em>, previously reported from the Raniganj (India), Yaguarí (Uruguay), and Tacuary (Paraguay) formations. Both woods exhibit secondary xylem features typical of Paleozoic gymnosperms, particularly concerning the radial system and the arrangement of pits in the tracheid walls. These xylological records confirm that the Carapacha Formation comprises another Permian sedimentological sequences that contain woods with diaphragm-solenoid pith such as the taxa found in the Melo (Uruguay), the Río Bonito, and the Irati (Brazil), the White Band (Africa), the Barakar, and the Raniganj (India) formations. This palaeofloristic association is part of the <em>Australoxylon</em> xylotaphoflora characteristic of the Gondwanan Permian. Finally, this study allows us to infer that the environmental conditions in this formation were warm with low humidity and seasonally dry.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200962"},"PeriodicalIF":1.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018780","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":"The oldest known Curvicubitidae (Hemiptera) from the Permian (Wuchiapingian) of Zhangshu City, Jiangxi Province, southern China","authors":"Qian-Qi Zhang ,&nbsp;Lin Mu ,&nbsp;Lei Zhang ,&nbsp;Xu-Heng Du ,&nbsp;Hai-Chun Zhang","doi":"10.1016/j.palwor.2025.200959","DOIUrl":"10.1016/j.palwor.2025.200959","url":null,"abstract":"<div><div>As the earliest record of the family Curvicubitidae <span><span>Hong, 1984</span></span>, Sinocurvicubitus qingjiangensis n. gen. n. sp. is established based on a cicada tegmen collected from the Laoshan Member of the Leping Formation in the Qingjiang Basin, Jiangxi Province, southern China. This new taxon is characterised by vein R forked at basal 1/3rd tegminal length, indentation at basal 2/3rds length, vein M first forked on nodal line, more developed M and less developed CuA. A Wuchiapingian age for this new species is suggested by the co-occurrence of the ammonoids <em>Araxoceras tricarinatus</em> and <em>Pseudogastrioceras</em> sp. The new find not only extends the known palaeogeographical range of curvicubitids in China, but also suggests an origin of this family in the Palaeozoic. This new record, combined with other records of Curvicubitidae, suggests a possibility of simultaneously northward and southward migration and dispersal of this family during the late Permian to the Late Triassic.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 5","pages":"Article 200959"},"PeriodicalIF":1.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170129","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}