Marine Micropaleontology最新文献

{"title":"High-resolution Danian–Selandian benthic foraminifera-based paleoenvironmental reconstruction and response to sequence stratigraphy: Inferences from the Elles section, El Kef Basin, Tunisia","authors":"Sherif Farouk ,&nbsp;Islam El-Sheikh ,&nbsp;Sreepat Jain ,&nbsp;Fayez Ahmad ,&nbsp;Zaineb Elamri ,&nbsp;Jenö Nagy ,&nbsp;Khaled Al-Kahtany ,&nbsp;Youssef S. Bazeen","doi":"10.1016/j.marmicro.2024.102433","DOIUrl":"10.1016/j.marmicro.2024.102433","url":null,"abstract":"<div><div>High-resolution (123 samples) benthic foraminiferal distribution patterns were analyzed for paleoenvironmental reconstruction from a section located at the southern edge of the El Kef Basin (El Haria Formation; Tunisia) spanning the Danian–Selandian interval (planktic foraminifera P1a–P4b zones). Five distinct clusters were identified, each representing different paleoenvironments and depths ranging from inner neritic to upper bathyal, with significant variations in species diversity, paleoproductivity, and bottom water oxygenation. The Dan-C2 hypothermal event is characterized by moderately oxygenated bottom waters, high species diversity, and lowered paleoproductivity within an upper bathyal setting. The LDE is marked by high species diversity, higher paleoproductivity, moderately oxygenated bottom waters, abundance of epifaunal species, and shallowing to middle neritic depths. The Danian-Selandian boundary records (a) a sudden abundance of the inner neritic infaunal species <em>Bulimina strobila</em>, (b) an increase in species diversity, (c) moderately‑oxygenated bottom waters, (d) a positive δ¹³C excursion, and (e) deepening, from inner to middle neritic settings. Four transgressive-regressive (T-R) cycles based on benthic foraminiferal assemblage-derived bathymetry, P% and the transfer function-based estimate mirror each other, and distinctly mirror paleodepth changes, correlating with global eustatic cycles but also reflecting local tectonic influences.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"194 ","pages":"Article 102433"},"PeriodicalIF":1.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Non-pollen palynomorphs as indicators of local environmental conditions in a Neotropical Estuary (Northeast Brazil)","authors":"Pietro Martins Barbosa Noga ,&nbsp;Anne de Vernal ,&nbsp;Daniela Mariano Lopes da Silva ,&nbsp;Doriedson Ferreira Gomes","doi":"10.1016/j.marmicro.2024.102424","DOIUrl":"10.1016/j.marmicro.2024.102424","url":null,"abstract":"<div><div>Non-pollen palynomorphs (NPPs) are organic-walled microfossils derived from diverse aquatic and terrestrial organisms, frequently observed in palynological studies. This study documents the distribution of NPPs in surface sediment samples from the two main rivers of Camamu Bay (Northeast Brazil), analyzed to explore their response to estuarine environmental and nutritional gradients. Using standard palynological techniques, 69 NPP taxa were identified, spanning 40 divisions, including dinoflagellates, foraminiferal linings, chlorophytes, cyanobacteria, ciliates, amoebozoans, scolecodonts, zoological fragments, and fungal spores. Assemblages were dominated by fungal spores across most stations. Distinct environmental gradients were reflected in NPP distribution, for instance upstream stations with low salinity (3 psu) and high nutrient ratios favored chlorophytes, while downstream stations with higher salinity (up to 35 psu) and lower N:P ratios (&lt;40 μM) were dominated by foraminiferal linings. Multivariate statistic analyses revealed that salinity and nutrient stoichiometry were significant drivers of assemblage composition. These findings highlight the utility of NPPs as indicators of environmental and biogeochemical conditions, particularly in low-latitude estuarine systems, and underscore their potential applications in paleoecological reconstruction.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"194 ","pages":"Article 102424"},"PeriodicalIF":1.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Benthic foraminiferal population dynamics at the Goban Spur off Southwest Ireland reveal glacial-interglacial bottom water ventilation and organic flux variability over the last 420,000 years","authors":"Stanislaus Glenndy Fabian ,&nbsp;Stephen J. Gallagher ,&nbsp;David De Vleeschouwer","doi":"10.1016/j.marmicro.2024.102432","DOIUrl":"10.1016/j.marmicro.2024.102432","url":null,"abstract":"<div><div>Benthic foraminiferal assemblages from Deep Sea Drilling Project (DSDP) Site 548 on the Goban Spur off southwestern Ireland shed light on the changes in bottom water oxygenation and organic matter flux to the sea floor during the late Quaternary. Correlations of benthic foraminiferal δ¹⁸O values, the relative abundance of <em>Neogloboquadrina pachyderma</em> (%NP), and Ice Rafted Debris (IRD) concentration to global and regional and North Atlantic datasets suggest the upper 60 m of DSDP Site 548 extend to 420,000 years. Downcore variations of &gt;63 μm benthic foraminifera assemblages, abundance, and diversity reveal changes in dissolved oxygen concentration and organic fluxes to the seafloor related to glacial-interglacial cyclicity. <em>Cassidulina laevigata</em> and low dissolved oxygen indicator taxa such as <em>Bolivina</em> spp. and <em>Globobulimina</em> spp. characterised colder climates associated with lighter benthic δ¹³C values, suggesting minimal organic flux and/or weaker bottom water ventilation. In contrast, warmer interglacials are typified by heavier benthic δ¹³C, increased %CaCO₃, common high dissolved oxygen indicator taxa such as <em>Globocassidulina subglobosa</em> and phytodetritus sensitive taxa such as <em>Alabaminella weddellensis</em> and <em>Epistominella exigua</em>, suggest a more ventilated bottom water and increased organic fluxes to the seafloor, possibly associated with the invigoration of the Mediterranean Outflow Water (MOW).</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"194 ","pages":"Article 102432"},"PeriodicalIF":1.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Paleoecological and paleoenvironmental insights from Ornatorotaliidae (larger foraminifera)","authors":"Andrea Benedetti ,&nbsp;Antonino Briguglio ,&nbsp;Lorenzo Consorti ,&nbsp;Cesare Andrea Papazzoni","doi":"10.1016/j.marmicro.2024.102423","DOIUrl":"10.1016/j.marmicro.2024.102423","url":null,"abstract":"<div><div>The present study deals with the ecology and phylogenetic relationships among species of the genera <em>Ornatorotalia</em>, <em>Granorotalia</em>, and <em>Risananeiza</em> belonging to the Family Ornatorotaliidae. The microfacies analyses allowed us to assign each taxon to its life paleoenvironment within the shallow-water carbonate setting, and to make a comparison with extant species belonging to the family Calcarinidae. While different species of <em>Ornatorotalia</em> and <em>Granorotalia</em> thrived only in the inner ramp, <em>Risananeiza</em> spp. possibly inhabited also deeper environments up to the middle ramp. The phylogenetic relationships among genera and species are here briefly discussed, nonetheless it's still impossible to identify any unambiguous ancestor of this group.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"194 ","pages":"Article 102423"},"PeriodicalIF":1.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Controls on barium incorporation into tests of benthic foraminifera from the Aegean Sea (Eastern Mediterranean Sea) – Towards a species-specific Ba/Ca calibration","authors":"Jassin Petersen ,&nbsp;Gerhard Schmiedl ,&nbsp;Jacek Raddatz ,&nbsp;André Bahr ,&nbsp;Jörg Pross ,&nbsp;Meryem Mojtahid","doi":"10.1016/j.marmicro.2024.102431","DOIUrl":"10.1016/j.marmicro.2024.102431","url":null,"abstract":"<div><div>We have analysed Ba/Ca ratios of live and dead benthic foraminifera (<em>Uvigerina mediterranea</em> and <em>Melonis affinis</em>) from core tops of seven sites located in the Aegean Sea by laser ablation ICP-MS. There are no significant Ba/Ca differences in live and dead specimens of <em>U. mediterranea</em>. For <em>M. affinis</em> we apply a threshold criterion for extremely high Ba/Ca in live specimens in order to highlight the overall uniform Ba/Ca signal. The Ba/Ca intra-test variability varies between 16 and 24 % relative standard deviation per specimen. It is attributed to biomineralisation processes i.e., vital effects. The Ba/Ca ratios of <em>M. affinis</em> are significantly higher than those of <em>U. mediterranea</em> throughout most of the sites and their respective samples from different sediment depths. The influence on Ba/Ca of both species by biomineralisation processes and/or microhabitat effects remains open. Linking the Ba/Ca ratios to measured Ba concentration of bottom waters from one of the studied sites, shows partition coefficients of D_Ba = 0.34, and D_Ba = 0.49 for <em>U. mediterranea</em> and <em>M. affinis</em>, respectively. We could not identify trends of Ba/Ca ratios to observed/ modelled gradients of relevant environmental factors between the seven analysed sites, such as primary productivity and associated C_org fluxes or TOC concentrations. Despite the demonstrated limited proxy potential in these parts of the Aegean Sea, we suggest that it is possible to employ Ba/Ca of infaunal benthic species in order to reconstruct export productivity in deep-sea areas with a less complex linkage between primary productivity and nutrient distribution in bottom waters.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"194 ","pages":"Article 102431"},"PeriodicalIF":1.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Evolutionary, paleoecological and taphonomic aspects of new agglutinated foraminifer Devonodendron scopulum from the Frasnian of Holy Cross Mts, Poland","authors":"Grzegorz Racki","doi":"10.1016/j.marmicro.2024.102434","DOIUrl":"10.1016/j.marmicro.2024.102434","url":null,"abstract":"<div><div>Regularly bifurcated tubiform (tree-like) microfossils, although illustrated three decades ago from the Frasnian of the Holy Cross Mts (southern Poland), have not been studied in detail until now. In this paper, the distinctive microproblematic is interpreted as a calcite-cemented agglutinated foraminifer belonging to <em>Devonodendron scopulum</em> sp. et gen. nov., appearing in a major radiation after the Givetian Revolution. Based on the study of isolated three-dimensional specimens, this Devonian species is the best documented of the early branching foraminifera. It resembles living arborescent representatives of the family Schizamminidae (such as <em>Schizammina arborescens</em> and <em>S. andamana</em>), but also the family Dendrophryidae (<em>Psammatodendron arborescens</em>), which has already been reported in the fossil record (Cretaceous; questionable Silurian). However, in light of genetic studies of modern monothalamids, phylogenetic inferences based on such simple morphology are risky. The tree-like branching system of this species suggests erect attached and filter feeding life habit. <em>Devonodendron scopulum</em> shows a pronounced microhabitat selectivity, being dominantly restricted to mid-slope metazoan-microbial mud-mounds. The buildups provided microniches for flourishing a very abundant and diverse calcareous microbiota, including taxa with known (<em>Nanicell</em>a) and presumed (<em>Eifeliflabellum</em>) foraminiferal affinities. The environment was characterized by a specific diagenetic setting for the fossilization of micritic-organic tubular tests due to rapid microbially mediated lithification and overwhelming recrystallization processes. As a result, microfossils are largely preserved as stacked homogeneous rhomboidal calcite plates. Many specimens in some sites are actually just coalesced sparry calcite ‘pseudomorphs’ mimicking the original test morphology.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"195 ","pages":"Article 102434"},"PeriodicalIF":1.5,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eocene to Early Miocene dinoflagellate cysts from the southern Gulf of Mexico","authors":"Alessandro-Cesare Bruno,&nbsp;Javier Helenes","doi":"10.1016/j.marmicro.2024.102422","DOIUrl":"10.1016/j.marmicro.2024.102422","url":null,"abstract":"<div><div>This paper documents the Eocene to Miocene dinoflagellate cyst assemblages found at Site 94 in the southern part of the Gulf of Mexico. Four unique dinoflagellate cyst assemblages representing depositional periods from the Early Eocene to the Early Miocene are defined in this study. The Early to Middle Eocene assemblage presents the highest average concentrations of dinoflagellate cysts, is dominated by <em>Operculodinium</em>, and contains few heterotrophic taxa. The Early Oligocene assemblage has medium concentration and is dominated by <em>Deflandrea</em>. The Late Oligocene also has high average concentrations of dinoflagellate cysts, is dominated by <em>Homotryblium</em>, and contains few heterotrophic taxa. The Early Miocene assemblage has lower average concentrations of dinoflagellate cysts, is dominated by <em>Pyxidinopsis</em>, and lacks heterotrophic taxa. Our palynological data is related to significant regional paleogeographic and paleoceanographic changes. Namely, the Early to Middle Eocene free flow of tropical water masses from the south and the Late Eocene restriction of this flow by a land bridge connecting northern South America to Cuba in the north. The Oligocene gradual return of the tropical water masses and finally, the Early Miocene emergence of the Florida Platform when the Gulf of Mexico reached modern oceanographic conditions. The stratigraphic ranges of selected dinoflagellate cysts fit in age with previous microfossil data from the site and allowed us to define the Early Oligocene - Late Oligocene transition. The presence of well-preserved dinoflagellate cysts allowed the identification of 60 species and the discovery of three new species: <em>Achomosphaera psilata</em> sp. nov., <em>Carpatella reticulata</em> sp. nov., and <em>Hystrichosphaeropsis gulficum</em> sp. nov.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"193 ","pages":"Article 102422"},"PeriodicalIF":1.5,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unraveling the palaeoecology of Paralia sulcata-dominated assemblages from Late Miocene marine deposits of Patagonia (South Atlantic, Argentina)","authors":"Aylén Allende Mosquera ,&nbsp;Rocío Fayó ,&nbsp;Camilo Andrés Vélez-Agudelo ,&nbsp;Marcela Alcira Espinosa ,&nbsp;José Ignacio Cuitiño","doi":"10.1016/j.marmicro.2024.102421","DOIUrl":"10.1016/j.marmicro.2024.102421","url":null,"abstract":"<div><div>The study of fossil diatom assemblages constitutes an effective tool for inferring past water conditions. Several studies from around the world suggest the Miocene was a key period in the evolutionary history of diatoms. However, Miocene diatom assemblages from the southwestern Atlantic Ocean are nearly unknown. This study aims to provide a palaeoenvironmental interpretation of the analysed succession. Additionally, to highlight temporal and regional changes, the assemblage is compared with known modern and fossil assemblages from Patagonia and other regions of the world. Finally, we provide a detailed description of the extinct diatom taxa recognised throughout the sedimentary succession. A total of 36 diatom taxa were recognised in the 25 analysed samples. Despite the evidence from sedimentology and macro-palaeontology indicating temporal changes from inner shelf to estuarine environments, the diatom assemblages are dominated by the coastal marine <em>Paralia sulcata sensu lato</em> throughout the succession. An important freshwater input into the coastal system is interpreted from our results reflecting more humid climatic conditions when compared with modern diatom assemblages from the same location. In addition, four extinct species were recognised: <em>Thalassiosira</em> cf. <em>yabei</em>, <em>Pseudopodosira westii</em>, <em>Rhaphoneis diamantella,</em> and <em>Lancineis rectilatus</em>. The presence of <em>R. diamantella</em> and <em>L. rectilatus</em> in the analysed deposits would imply an expansion of their geological range.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"193 ","pages":"Article 102421"},"PeriodicalIF":1.5,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ocean gateways and circulation dynamics: Unveiling the deep water-mass properties in the western equatorial Pacific since the Middle Miocene","authors":"Himanshu Bali,&nbsp;Anil K. Gupta","doi":"10.1016/j.marmicro.2024.102420","DOIUrl":"10.1016/j.marmicro.2024.102420","url":null,"abstract":"<div><div>Tectonically driven adjustments in the ocean gateways, such as the constriction and closure of the Central American Seaway (CAS), have been linked to the significant variations in deep water circulations across the Atlantic and Pacific Oceans in the Miocene. The changes in these tectonic gateways had substantial consequences on the Atlantic Meridional Overturning Circulation (AMOC), the Antarctic Circumpolar Current (ACC) and consequently Antarctic ice sheet growth, and deep water circulation pathways across the ocean basins. The timing of the closure of the deep water connection between the Atlantic and Pacific Oceans, through CAS, and related changes in deep water circulation in the western Pacific are still debatable. We examined foraminiferal relative abundances of epibenthic genus <em>Cibicidoides</em> (a synonym of <em>Cibicides</em>) and its stable isotopic ratios to decipher the timing of tectonically controlled changes in deep water circulation since the Middle Miocene at ODP Site 807, western equatorial Pacific. Our findings, correlated with previously published data, suggest the North Component Water (NCW) incursion from the Atlantic to the western Pacific (Site 807) via CAS between ∼12.5 and ∼ 9.5 Ma. An abrupt decrease in benthic foraminifer <em>Cibicidoides kullenbergi</em> at ∼9.5 Ma suggests the initiation of a significant shift in the deep water mass, coinciding with the major δ¹³C divergence between the Atlantic and Pacific oceans.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"193 ","pages":"Article 102420"},"PeriodicalIF":1.5,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bashkirian-Moscovian (Lower–Middle Pennsylvanian) conodonts from the Amazonas Basin, northern Brazil: Biostratigraphy, biofacies, and paleobiogeographic significance for Western Gondwana","authors":"Martín A. León-Caffroni ,&nbsp;Ana K. Scomazzon ,&nbsp;Tamara I. Nemyrovska ,&nbsp;Sara Nascimento ,&nbsp;Andrés F.R. Mantilla ,&nbsp;Sanmya K.R. Dias ,&nbsp;Amanda P. da Rosa ,&nbsp;Jordana M. Viccari ,&nbsp;Paulo A. Souza ,&nbsp;Valesca B. Lemos","doi":"10.1016/j.marmicro.2024.102407","DOIUrl":"10.1016/j.marmicro.2024.102407","url":null,"abstract":"<div><div>Bashkirian-Moscovian (Lower to Middle Pennsylvanian) Itaituba Formation is well exposed in the Itacimpasa Quarry at the southern platform of the Amazonas Basin, northern Brazil. An abundant and diverse conodont fauna was recovered from this predominantly carbonate formation, with a total of 19 species belonging to 8 genera identified. The following species were documented and systematically described for the first time in the basin: <em>Declinognathodus marginodosus</em>, <em>Declinognathodus donetzianus</em>, <em>Idiognathoides postsulcatus</em>, <em>Idiognathoides fossatus</em>, <em>Diplognathodus benderi</em>, <em>Adetognathus spathus</em>, and <em>Idioprioniodus conjunctus</em>, providing significant stratigraphic and environmental insights into the Bashkirian-Moscovian boundary (BMB) interval. The <em>Declinognathodus marginodosus</em> – <em>Neognathodus atokaensis</em> (upper Bashkirian Stage) and the <em>Declinognathodus donetzianus</em> – <em>Diplognathodus ellesmerensis</em> (lower Moscovian Stage) zones are recognized. The distribution of conodonts studied through cluster analysis reveals the conodont biofacies <em>Idiognathodus</em>/<em>Adetognathus</em> and <em>Declinognathodus</em>/<em>Idiognathoides</em> biofacies. Changes in these conodont biofacies are interpreted as the result of a marine ingression event in Western Gondwana during the BMB interval. The fauna recorded in the studied section shows affinities with conodont faunas reported from Paleo-Tethys Ocean regions indicating a faunal connection of this ocean with the Panthalassa in Western Gondwana. These findings contribute significantly to the refinement of the biostratigraphy and paleobiogeography of the Bashkirian-Moscovian boundary interval in the Amazonas Basin and Western Gondwana.</div></div>","PeriodicalId":49881,"journal":{"name":"Marine Micropaleontology","volume":"192 ","pages":"Article 102407"},"PeriodicalIF":1.5,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}