Cretaceous Research最新文献

{"title":"Detrital zircon populations in the early cretaceous Laiyang Sag: Implications for the evolution of the Basin and peripheral orogenic belt","authors":"Chenlin Zhu ,&nbsp;Chao Han ,&nbsp;Zhigang Song ,&nbsp;Shourui Dai ,&nbsp;Jie Li ,&nbsp;Yuetong Zhang ,&nbsp;Xiang Ren ,&nbsp;Zuozhen Han","doi":"10.1016/j.cretres.2025.106267","DOIUrl":"10.1016/j.cretres.2025.106267","url":null,"abstract":"<div><div>During the Early Cretaceous, the Paleo Pacific Plate underwent extensive subduction beneath the Eurasian continent, which coincided with substantial lithospheric thinning in the North China Craton. The Jiaolai Basin, which formed during this period, is located along the southeastern margin of the North China Craton, and is positioned between the Sulu Orogenic Belt (SLOB) and the Jiaobei Terrane (JBT). The sedimentary sequences in the basin record relevant information on the evolution of the surrounding tectonic units. Thus, this study conducted petrographic and detrital zircon U–Pb geochronological analyses on sandstones from the Lower Cretaceous Laiyang Formation in the Laiyang Sag. The findings indicate that: (1) during the Early Cretaceous, detrital sources within the Laiyang Sag displayed a distinct evolutionary pattern: early-stage deposits were primarily sourced from the JBT, with a subsequent transition towards dual-source inputs from both the JBT and the SLOB. (2) At approximately 123 Ma, intensified faulting along the southern margin of Jiaolai Basin led to the rapid deposition of substantial amounts of detrital material from the SLOB. (3) The SLOB may have been exhumed above the surface during the Middle–Late Jurassic and continued to supply sediment to the Laiyang Sag.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106267"},"PeriodicalIF":1.7,"publicationDate":"2025-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145623593","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":"†Trichochterus gen. nov., a new genus of velvety shore bugs from Burmese amber with strong terrestrial adaptation (Insecta: Hemiptera: Ochteridae)","authors":"Chunlan Xian ,&nbsp;Pingping Chen ,&nbsp;Qiang Xie ,&nbsp;Yanhui Wang","doi":"10.1016/j.cretres.2025.106265","DOIUrl":"10.1016/j.cretres.2025.106265","url":null,"abstract":"<div><div>A new genus of the family Ochteridae (Hemiptera: Nepomorpha), †<em>Trichochterus</em> gen. nov., is described from mid-Cretaceous, with two new species: †<em>T. zhengi</em> sp. nov. and †<em>T. nieseri</em> sp. nov. The new genus can be distinguished from other ochterids by its unique antennal structure and the first documented occurrence of trichobothrium-like setae within the family. Notably, the presence of trichobothria in velvety shore bugs represents a distinctive morphological feature, potentially reflecting ecological specialization in riparian or terrestrial habitats. Detailed morphological descriptions, supported by high-resolution photographs and illustrations, highlight the diagnostic characters of †<em>Trichochterus</em> gen. nov., such as the elongate rostrum, ridged frons, cursorial legs, and tarsal formula. An updated identification key and a comparative table are provided to facilitate the classification of all extant and fossil genera of Ochteridae. Furthermore, the phylogenetic placement of the newly established genus was assessed based on a morphological matrix.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106265"},"PeriodicalIF":1.7,"publicationDate":"2025-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579115","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":"A continental record of the late Campanian negative carbon isotopic excursion (LCE, late Campanian event) in the Dinosaur Park Formation, Alberta, Canada","authors":"Muditha Goonetilleke,&nbsp;Ricardo L. Silva,&nbsp;Paul R. Durkin","doi":"10.1016/j.cretres.2025.106263","DOIUrl":"10.1016/j.cretres.2025.106263","url":null,"abstract":"<div><div>The Campanian was the longest stage of the Late Cretaceous and witnessed multiple global carbon cycle disruption episodes, including the negative carbon isotope excursion (CIE) known as the Late Campanian Event (LCE). However, Campanian-aged δ¹³C perturbations are primarily documented in marine environments, raising questions about their record in terrestrial settings and the potential use of terrestrial stable carbon isotope records from the Campanian as a chemostratigraphic tool. In this study, we present a stable carbon isotope record from fossil organic matter preserved in the alluvial floodplains of the Dinosaur Park Formation, which is radiometrically dated to the time interval containing the LCE. Results reveal a ∼0.8 ‰ negative CIE recorded in floodplain fossil organic matter. We show that the negative CIE is not a result of changing organic matter or diagenesis and that it likely reflects the global atmospheric δ¹³C signal during the Campanian. We interpreted the identified negative CIE as a continental record of the LCE. When we couple our δ¹³C_TOC record with the Dinosaur Park Formation's age model, we can correlate our section with other well-dated European marine stratigraphic sections. Our findings demonstrate that Campanian carbon cycle perturbations are preserved in terrestrial environments. For the first time, we recognize that the deposition of the world-famous dinosaur-bearing Dinosaur Park Formation in Alberta was contemporaneous with a major global carbon cycle perturbation episode. Our findings contribute to contextualizing ongoing research and re-evaluating previous studies on dinosaur evolution and other contemporary groups, within the framework of planetary-scale Earth system disturbances.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106263"},"PeriodicalIF":1.7,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579117","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":"Diving in the Maastrichtian of Marambio (Seymour) Island: A new member of the Neoaves in the Cretaceous Antarctic avifauna","authors":"Facundo Irazoqui ,&nbsp;Carolina Acosta Hospitaleche ,&nbsp;Javier N. Gelfo ,&nbsp;Ariana Paulina Carabajal ,&nbsp;Paula Bona ,&nbsp;Leonel Acosta Burlaille","doi":"10.1016/j.cretres.2025.106259","DOIUrl":"10.1016/j.cretres.2025.106259","url":null,"abstract":"<div><div>A new genus and species of Cretaceous bird from Antarctica with implications for the early evolution of Neornithes is described here. The type specimen of <em>Pujatopouli soberana</em> gen. et sp. nov. (MLP-PV 08-XI-30-44), preserving part of the skull and postcranium, was recovered from Maastrichtian deposits of the López de Bertodano Formation on Marambio (Seymour) Island, James Ross Basin, West Antarctica. The phylogenetic relationships of <em>Pujatopouli</em> with other avian species, including all previously described Cretaceous birds from Antarctica, were assessed using two different datasets. The first, mainly composed of Mesozoic birds, places <em>Pujatopouli</em> within the crown group of birds (Neornithes), whereas the second, which includes a broad sampling of modern taxa, positions it within Neoaves, and closely related to the ‘core-waterbirds’ (Aequornithes). Besides, morphological evidence suggests that <em>Pujatopouli</em> was a foot-propelled diver with an ichthyophagous diet, living sympatrically with other neornithine birds along the Antarctic coast during the latest Cretaceous.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106259"},"PeriodicalIF":1.7,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579116","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 of lower Aptian charophytes from the Southern High Plateaus (Eastern Meseta, Morocco): biostratigraphic and biogeographic significance","authors":"Hamid Haddoumi ,&nbsp;Jordi Pérez-Cano ,&nbsp;Rachid Chennouf ,&nbsp;Jemaa Amakrane ,&nbsp;Sidi Mohamed Mamoun","doi":"10.1016/j.cretres.2025.106262","DOIUrl":"10.1016/j.cretres.2025.106262","url":null,"abstract":"<div><div>Two stratigraphic sections of the Southern High Plateaus (Eastern Meseta, Morocco) were sampled for the charophyte study. Seven clavatoracean taxa are described and illustrated from the Dekar 1 and Dekar 2 formations, including <em>Echinochara lazarii</em>, <em>Atopochara trivolvis</em> var. <em>trivolvis</em>, <em>Clavator grovesii</em> var. <em>jiuquanensis</em>, <em>Clavator grovesii</em> var. <em>corrugatus</em>, <em>Clavator harrisii</em> var. <em>harrisii</em>, <em>Clavator harrisii</em> var. <em>reyi</em>, and <em>Clavator harrisii</em> var. <em>zavialensis</em>. This assemblage is assigned to the upper part of the Eurasian Clavator grovesii var. jiuquanensis biozone. The occurrence of intermediate populations of <em>C. grovesii</em> var. <em>jiuquanensis</em> and <em>C. grovesii</em> var. <em>corrugatus</em> associated with intermediate populations of <em>C. harrisii</em> var. <em>harrisii</em>, <em>C. harrisii</em> var. <em>reyi</em>, and <em>C. harrisii</em> var. <em>zavialensis</em>, restricts the association to the lower Aptian. These new findings suggest that this area could be important for understanding the evolution of charophytes during the early Aptian. Furthermore, the study provides significant insights into the paleobiogeographic distribution of Lower Cretaceous charophytes, reporting the first record of <em>C. grovesii</em> var. <em>jiuquanensis</em> (previously described only from Eurasia) and <em>C. grovesii</em> var. <em>corrugatus</em> (previously known from the Iberian Peninsula and the United States) in Africa, along with the first report of <em>Echinochara lazarii</em> in the Western Atlas Domain. Similar lower Aptian assemblages had previously been described only in the Algarve Basin (South Portugal), suggesting a strong paleogeographic connection between these areas.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106262"},"PeriodicalIF":1.7,"publicationDate":"2025-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145684267","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":"Coniacian (Late Cretaceous) echinoids from the southern Tethyan shelf (NE Algeria) with remarks on their palaeobiology and palaeobiogeography","authors":"Nils Schlüter ,&nbsp;Rafika Slami ,&nbsp;Madani Benyoucef ,&nbsp;Abdelmoumen Garah ,&nbsp;W. James Kennedy ,&nbsp;Ireneusz Walaszczyk","doi":"10.1016/j.cretres.2025.106261","DOIUrl":"10.1016/j.cretres.2025.106261","url":null,"abstract":"<div><div>Thirteen echinoid taxa are described from Coniacian marl-limestone alternations in three sections south and east of Djebel Metlili, on the southwestern margin of the Aures Mountains in northeastern Algeria. The biostratigraphic framework, based on ammonites and inoceramids, indicates an early to middle Coniacian age. The identified taxa include: <em>Rachiosoma rectilineatum</em>, <em>Phymosoma tamarinense</em>, <em>P</em>. cf. <em>P. mansour</em>, <em>Gomphechinus meslei</em>, <em>Coenholectypus subcrassus, Parapygus coquandi</em>, <em>Petalobrissus trigonopygus</em>, <em>P</em>. <em>rimula</em>, <em>Hemiaster</em> sp., and <em>Mecaster fourneli</em>. Three new species are described, <em>Orthopsis metliliae</em> sp. nov., <em>Coenholectypus sulcatus</em> sp. nov. and a new genus and species referred to the family Phymosomatoidae, <em>Triboporus luluatus</em> gen. et sp. nov. A large amount of well-documented material, comprising 579 specimens, was collected, with the fauna being dominated by the spatangoid <em>Mecaster fourneli</em>. At the genus level, the fauna exhibits characteristics typical of the Tethyan realm, and includes <em>Rachiosoma</em>, <em>Gomphechinus</em>, <em>Mecaster</em>, <em>Parapygus</em> and <em>Petalobrissus</em>. However, at the species level, most taxa are restricted to Algeria. Some are also found in adjacent countries such as Tunisia and Egypt.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106261"},"PeriodicalIF":1.7,"publicationDate":"2025-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579114","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":"Diversity of araucariacean pollen from the Lower Cretaceous Rio da Batateira and lower Crato formations (Araripe basin, SE Brazil), based on micromorphology of the ektexine using SEM","authors":"Christa-Ch Hofmann ,&nbsp;Mario Coiro ,&nbsp;Ulrich Heimhofer ,&nbsp;Emily A. Roberts ,&nbsp;Leyla J. Seyfullah","doi":"10.1016/j.cretres.2025.106260","DOIUrl":"10.1016/j.cretres.2025.106260","url":null,"abstract":"<div><div>Here we demonstrate the micromorphological variety of Aptian pollen grains affiliated with Araucariaceae s.l. with LM and SEM. We could distinguish five micromorphological groups and in addition to well known araucariacean pollen taxa such as <em>Araucariacites</em> spp., <em>Balmeiopsis</em> and <em>Callialasporites</em> spp., we could also assign <em>Exesipollenites scabratus,</em> <em>E.</em> cf. <em>tumulus</em>, and one <em>Inaperturopollenites</em> taxon as araucariacean. Using LM, a hidden diversity of micromorphological features are missed within the four pollen taxa (“Araucariaceae” sp. 1 to sp. 4) that are similar to the morphogenus <em>Araucariacites</em> demonstrating the importance of using scanning electron microscopy in palaeopalynology. Pollen characterized by micromorphological features of group 4 comprises <em>Callialasporites</em> spp., <em>Inaperturopollenites</em> sp. and “Araucariaceae” sp. 1 and are assumed to be dispersed equivalents of previously described eurypalynous pollen cones. These pollen cones and pollen grains might represent an ancient group of Araucariaceae with overlapping characters from Podocarpaceae and Araucariaceae. In total 15 Araucariaceae pollen taxa are present in the Rio da Batateira and lower Crato formations, a number that exceeds the diversity of previously described araucariacean macrofossils and pollen of the Araripe basin. These results are evidence that despite the rapid evolution of angiosperms in the Early Cretaceous, gymnosperms, particularly Araucariaceae, still played an important role in various ancient vegetation habitats.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"178 ","pages":"Article 106260"},"PeriodicalIF":1.7,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579082","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":"A new large zalambdalestid mammal from the Gobi Desert and formal stratigraphic description of the Upper Cretaceous Zos Formation","authors":"Michael J. Novacek ,&nbsp;William M. Wolfe ,&nbsp;Maureen A. O'Leary ,&nbsp;Eric M. Roberts","doi":"10.1016/j.cretres.2025.106253","DOIUrl":"10.1016/j.cretres.2025.106253","url":null,"abstract":"<div><div>We describe <em>Zoslestes gongori</em>, a new species of non-placental eutherian mammal from Upper Cretaceous rocks of Zos Canyon in the Nemegt Basin of the western Gobi Desert, Mongolia. <em>Zoslestes gongori</em> is the largest known zalambdalestid. The Zos Canyon locality, Red Rum, that yielded the specimen is adjacent to beds that have produced several extinct crocodyliforms and the ornithischian dinosaur <em>Haya griva</em>. We provide the first formal stratigraphic description of these fossiliferous Zos Canyon rocks by naming and describing the Zos Formation for the unit at Red Rum. The Zos Formation has a distinct set of sedimentologic associations that differentiate it from the overlying Djadokhta Formation and also has the only fauna in the Nemegt Basin older than that of the Djadokhta Formation. We consider the Zos Formation roughly comparable in age to the Javkhlant Formation of the Eastern Gobi Desert, and likely older than the Alagteeg Formation of the Ulan Nur Basin.</div><div><em>Zoslestes gongori</em> is known from the holotype, a well-preserved posterior cranium, worn dentition, and fragmentary postcranial elements, and one referred specimen. The referred specimen consists of a damaged anterior skull and dentition, and a fragmentary left mandible with roots and alveoli, including an enlarged tooth resembling the elongate first lower incisor of zalambdalestids. <em>Zoslestes</em> shares several derived features with zalambdalestids, including the presence of a prominent entoglenoid process that, in ventral view, partly conceals the anteriorly-positioned postglenoid foramen, a large maxillary tuberosity, multiple hypoglossal foramina, a large, elongate i1 with a horizontally directed root extending deep within the mandible, lower molars with mesiodistally compressed trigonids and relatively wide talonids, a relatively large P4, and upper molars that are distinctly wider labiolingually than long mesiodistally and that are not interlocked mesiodistally. The significantly large size of <em>Zoslestes</em> and the large contribution of its jugal to the zygomatic process are autapomorphies distinguishing this taxon from other zalambdalestids.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106253"},"PeriodicalIF":1.7,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145520351","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":"Stratigraphic sequence and age determination of the cretaceous rift-sag transition period in the Songliao basin, NE China: Based on new data from ICDP boreholes SK2 and SK3","authors":"Shuo Liu ,&nbsp;Youfeng Gao ,&nbsp;Renjie Liang ,&nbsp;Pujun Wang ,&nbsp;Haibo Liu","doi":"10.1016/j.cretres.2025.106257","DOIUrl":"10.1016/j.cretres.2025.106257","url":null,"abstract":"<div><div>The Songliao Basin's tectonic evolution comprises three stages: the syn-rift stage, post-rift stage, and structural inversion stage. The Yingcheng Formation and the Denglouku Formation record the strata corresponding to the transitional period from the syn-rift stage to the post-rift stage. However, the stratigraphic boundary between these two formations and the sedimentation time of the Denglouku Formation remain controversial. This paper undertakes a zircon isotope chronology study on the tuff from the lower part of the Denglouku Formation, based on the continuous coring data from the International Continental Scientific Drilling Program (ICDP) boreholes SK2 and SK3 in the Songliao Basin. The LA-ICP-MS U–Pb age of the tuff at 2359.35 m depth in the lower part of the Denglouku Formation in borehole SK3 is determined to be 105.4 ± 0.6 Ma, constraining the initial sedimentation time of the Denglouku Formation, while an age of 103.4 ± 0.8 Ma from the tuff at 2970.65 m at the base of the Denglouku Formation in borehole SK2 marks the end of the first member's sedimentation. By integrating the existing chronostratigraphic data with basin-scale stratigraphic correlations from the Songliao Basin, this study re-evaluates the controversial sandy conglomerates within the fourth member of the Yingcheng Formation in the northern Songliao Basin, demonstrating their affinity to the first member of the Denglouku Formation.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106257"},"PeriodicalIF":1.7,"publicationDate":"2025-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418135","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":"Seawater properties based on clumped isotope analyses of macrofossil assemblages from the Upper Cretaceous–lower Paleocene Type-Maastrichtian area","authors":"Inigo A. Müller ,&nbsp;David Rijkes ,&nbsp;Emily J. Judd ,&nbsp;Maartje F. Hamers ,&nbsp;Oliver Plümper ,&nbsp;John W.M. Jagt ,&nbsp;Martin Ziegler","doi":"10.1016/j.cretres.2025.106258","DOIUrl":"10.1016/j.cretres.2025.106258","url":null,"abstract":"<div><div>Carbonate fossils from the Maastrichtian Type area offer important insights into climate dynamics across the Cretaceous/Paleogene boundary. While previous research has established the biostratigraphy and a carbon isotope-based geochronological timescale, allowing for global data comparison, constraints on the local seawater properties remain limited. Our study utilizes oxygen and carbon isotopes, as well as clumped isotope thermometry to reconstruct seawater temperature and its oxygen isotope composition based on carbonate fossil assemblages. Novel analyses of fossil echinoderms, brachiopods, gastropods, bivalves, bryozoans and existing studies were clustered according to their stratigraphy and show temperature fluctuations ranging between <span><math><mrow><msubsup><mn>18.3</mn><mrow><mo>−</mo><mn>3.2</mn></mrow><mrow><mo>+</mo><mn>3.4</mn></mrow></msubsup></mrow></math></span> to <span><math><mrow><msubsup><mn>22.7</mn><mrow><mo>−</mo><mn>4.9</mn></mrow><mrow><mo>+</mo><mn>5.1</mn></mrow></msubsup></mrow></math></span> °C (±95 % CI) that together with existing studies temporary match varying activity of Deccan Trap volcanism. The mean temperature estimate for the late Maastrichtian–early Danian of <span><math><mrow><msubsup><mn>20.6</mn><mrow><mo>−</mo><mn>1.2</mn></mrow><mrow><mo>+</mo><mn>1.2</mn></mrow></msubsup></mrow></math></span> °C is slightly warmer than modern annual sea surface temperatures at the same latitude and in line with palaeoclimate simulations using 3 times the preindustrial atmospheric pCO₂ as model input. The oxygen isotope composition of the shallow sea environment fluctuate between <span><math><mrow><msubsup><mn>0.3</mn><mrow><mo>−</mo><mn>0.9</mn></mrow><mrow><mo>+</mo><mn>0.9</mn></mrow></msubsup></mrow></math></span> to <span><math><mrow><msubsup><mn>1.0</mn><mrow><mo>−</mo><mn>0.9</mn></mrow><mrow><mo>+</mo><mn>1.0</mn></mrow></msubsup></mrow></math></span>‰, together with existing data even to slightly negative values. These fluctuations reflect the highly dynamic hydrologic conditions linked to variations in the evaporation/precipitation budget, sea-level fluctuations and eventual changes in seawater circulation. This study on fossil assemblages from the Maastrichtian Type area shows the dynamic seawater conditions in shallow sea systems and the urgent need for higher spatial and subseasonal resolution when reconstructing regional climate conditions in epeiric marine environments.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"179 ","pages":"Article 106258"},"PeriodicalIF":1.7,"publicationDate":"2025-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145466986","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}