Journal of South American Earth Sciences最新文献

{"title":"Schellwienella amazonensis (Orthotetida, Brachiopoda): New species of the genus in the Lochkovian of the Amazonas Basin (Manacapuru Formation), northern Brazil","authors":"Luiz Felipe Aquino Corrêa ,&nbsp;Maria Inês Feijó Ramos ,&nbsp;João Marcelo Pais de Rezende","doi":"10.1016/j.jsames.2024.105253","DOIUrl":"10.1016/j.jsames.2024.105253","url":null,"abstract":"<div><div>The Devonian was a critical period in the global evolution of brachiopods, during which the phylum reached its maximum diversity in the Emsian and experienced a significant decline during the Frasnian–Famennian, second only to the mass extinction of the Late Permian. The brachiopod fauna of the Manacapuru Formation (Lochkovian) was unknown until 2011, when a significant number of Rhynchonelliformea and Linguliformea samples were recovered during paleontological salvage at the Belo Monte hydroelectric plant in Vitória do Xingu, Pará, Brazil. This study aims to identify the Orthotetida from this salvage. The taxonomic study of the brachiopods from the Manacapuru Formation (Lochkovian) led to the recognition of a new species, <em>Schellwienella amazonensis</em> n. sp., Family Pulsiidae Cooper and Grante, 1974. <em>Schellwienella amazonensis</em> n. sp. and <em>Schellwienella marcidula</em> Amsden, 1958 originally described to the Bois d’Arc Formation (Lochkovian), USA are the oldest records of the genus. The genus <em>Schellwienella</em> was present throughout all stages of the Devonian, primarily in the Gondwana siliciclastic marine environments, transiting between temperate and polar latitudes, and disappeared in the Viséan (early Carboniferous) under warmer waters and carbonate platform conditions typical of low-latitude regions.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"150 ","pages":"Article 105253"},"PeriodicalIF":1.7,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658257","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":"A partial skeleton of Typotheriopsis chasicoensis (Mesotheriidae, Notoungulata): The first accurate mammal record from the La Pilona Formation (Late Miocene), Cacheuta basin, central-western Argentina","authors":"Esperanza Cerdeño ,&nbsp;Santiago Hernández Del Pino ,&nbsp;Gabriela I. Schmidt ,&nbsp;Julieta Suriano","doi":"10.1016/j.jsames.2024.105255","DOIUrl":"10.1016/j.jsames.2024.105255","url":null,"abstract":"<div><div>A partial skeleton of Mesotheriidae was recovered from the La Pilona Formation, cropping out in the core of the Tupungato Anticline, Cacheuta Basin, northern Mendoza Province (Argentina). This finding constitutes the first accurate fossil mammal from this unit, referred to the early Late Miocene (Tortonian; Chasicoan Stage/Age). The comparative study of the specimen IANIGLA-PV 1203 allows its determination as <em>Typotheriopsis chasicoensis</em>; many postcranial elements are herein described for the first time for this species, as well as for the compared <em>T. silveyrai</em> from the Río de los Pozos Formation in the same area. The body mass of IANIGLA-PV 1203 is calculated around 73 kg. The presence in Mendoza of <em>T. chasicoensis</em> expands the geographical distribution of the species, originally defined from the Arroyo Chasicó locality (Buenos Aires Province) and later recognized in localities of La Pampa Province, from sediments of the Cerro Azul Formation. The numerical ages constraining La Pilona Formation agree with the age of the Arroyo Chasicó locality. In La Pampa, <em>T. chasicoensis</em> is present at Cerro La Bota, assigned to the Chasicoan Stage/Age based on the faunal assemblage, but also in Algarrobo del Águila and Telén that are transitional and early Huayquerian in age, respectively. <em>Typotheriopsis silveyrai</em> is recognized in Huayquerian levels of Mendoza, Catamarca, and La Pampa provinces, and <em>Typotheriopsis</em> sp. in Chasicoan levels of La Rioja Province.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105255"},"PeriodicalIF":1.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703638","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":"Magnetostratigraphic and sedimentological insights into the Late Campanian Uberaba Formation of the Bauru Group, southeast Brazil","authors":"Marcia Ernesto ,&nbsp;Tamrat Endale ,&nbsp;Alessandro Batezelli ,&nbsp;Antonio Roberto Saad","doi":"10.1016/j.jsames.2024.105252","DOIUrl":"10.1016/j.jsames.2024.105252","url":null,"abstract":"<div><div>The Uberaba Formation, a significant paleontological site within the Bauru Group, was deposited over the Early Cretaceous volcanic rocks of the Paraná Basin in southern Brazil. It occupies a restricted northeastern area of the basin surrounding the homonymous city. Recent works on stratigraphy and paleontology indicate a Campanian age, a novel finding that challenges the previously held belief of a Cenomanian age based on dinosaur bones. Paleomagnetic work on seven sections of the Uberaba formation has resulted in the calculation of a paleomagnetic pole at 82.2°S 350.8°E (N = 89; k = 23; A₉₅ = 3.2°) after correcting for the shallowing of the magnetic inclination caused by overload. The formation is dated to ∼73 Ma (Campanian) age based on magnetostratigraphic data and comparisons with other Late Cretaceous poles. This age implies an interval of about 40 Myr separates the deposition of the Uberaba and Caiuá formations– the latter being the first post-magmatic sedimentation in the Paraná Basin. The area stayed as a highland until the tectonic events related to the northward emplacement of the alkaline provinces. High deposition rates were determined, at least for the upper part of the formation, based on the magnetostratigraphic characteristics.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105252"},"PeriodicalIF":1.7,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704209","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":"Hydrochemistry and surface water - groundwater interactions in an anthropically disturbed mountain river (Sierras Pampeanas, central Argentina)","authors":"Verena A. Campodonico ,&nbsp;Andrea I. Pasquini ,&nbsp;Karina L. Lecomte ,&nbsp;Brenda Y. Alvarez ,&nbsp;M. Gabriela García","doi":"10.1016/j.jsames.2024.105251","DOIUrl":"10.1016/j.jsames.2024.105251","url":null,"abstract":"<div><div>The surface water - groundwater interactions in a small anthropically affected mountain watershed (Salsipuedes River) in the Sierras Pampeanas (central Argentina) were analyzed and quantified by means of ²²²Rn mass balance modeling, and its implications in hydrochemistry and water quality were examined. Surface waters, springs and groundwater were sampled during the 2021–2022 hydrological year, and the major dissolved composition was determined. The studied waters are alkaline, showing an evolution from medium mineralized (1.5 &lt; ∑⁺ &lt; 3 meq L⁻¹) to mineralized type (3 &lt; ∑⁺ &lt; 6 meq L⁻¹) downstream. In general, waters are of the bicarbonate - calcium type with no spatial or seasonal variations. This composition is mainly controlled by silicates weathering. ²²²Rn modeling indicates that near the headwaters the Salsipuedes River recharges the aquifer, losing 1.2% and 2.4% of its discharge during the dry and wet seasons, respectively. Downstream, the system changes its hydrological behavior and the river acts as a gaining stream; i.e, it receives groundwater inflow. The magnitude of this inflow varies seasonally, being greater in the wet season (1.5–2.2% of the total flow) than in the dry season (less than 0.25%) due to a rise in the water table level as a result of direct recharge of the phreatic aquifer. Anthropic influence is noticeable in nitrate and chloride concentrations, which are derived from domestic wastes and septic tanks. The highest concentrations of these ions in surface waters are found in the urbanized area, where the river stretch corresponds to a gaining stream, reflecting that even small amounts of groundwater inputs can alter the chemical composition of streams. A temporal analysis also showed a variable response of the system to the increasing anthropic pressure and climatic events such as ENSO, which affect not only water availability but also its quality, highlighting the vulnerability of small mountain watersheds.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"150 ","pages":"Article 105251"},"PeriodicalIF":1.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658259","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":"Metal concentration in bottom sediments for a tropical river, geological or anthropogenic source?","authors":"Aracelis Narayan ,&nbsp;Iván Horacio Esteves ,&nbsp;Militza Rodríguez ,&nbsp;Judith Rosales","doi":"10.1016/j.jsames.2024.105237","DOIUrl":"10.1016/j.jsames.2024.105237","url":null,"abstract":"<div><div>The study analyzes data from a survey of metal concentrations in bottom sediments from both margins (left and right) of the lower main channel of the Orinoco River. This study aims to analyze metal concentrations in the bottom sediments of the lower Orinoco River with different geological settings and anthropological sources. El Almacen (ALM), Las Galderas (G), Los Castillos de Guayana (C), Ciudad Bolivar (CB), and Ciudad Guayana (CG) were the sampling sites. Freshwater physicochemical parameters pH, conductivity, and DO were measured <em>in situ</em> at each sample site. Twenty-four bottom sediment samples were collected with an Eckman grab, dried, and sieved. Trace elements Pb, Cr, Cu, Cd, Ti, and Co were measured in sediments with grain sizes &lt;63 μm. Bottom sediment analysis followed EPA method 3050B (digestion with HNO₃ + HCl + H₂O₂). Statistical analyses included the Shapiro-Wilk test, Spearman correlation, Kruskal-Wallis test, and principal component analysis (PCA). Physicochemical parameters highlighted the marked difference between the left and the right river margins, reflecting the cross-channel heterogeneity due to the dissimilar geology and low horizontal mixing. Metal concentrations were generally low, with higher variations associated with urban and industrial sources. Pb, Cr, Cu, Cd, Ba, Ti, and Co concentrations did not generally indicate significant pollution, but potential contamination from sewage and industrial effluents was noted. The differences between the two river margins were common in all the sampling sites, reflecting the sources of water biochemistry related to geochemical origins in the Andes and the Guiana Shield, respectively. The study emphasizes the importance of sampling location within the river channel.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"150 ","pages":"Article 105237"},"PeriodicalIF":1.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658260","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":"Paleomagnetic study of Tres Vírgenes Volcanic Complex, Baja California, Mexico","authors":"José Daniel Sebastián-Reyes ,&nbsp;Rafael García-Ruiz ,&nbsp;Denis-Ramón Avellán ,&nbsp;Avto Goguitchaichvili ,&nbsp;Ruben Cejudo Ruiz ,&nbsp;Vadim Kravchinsky ,&nbsp;Nayeli Pérez Rodríguez ,&nbsp;Miguel Angel Cervantes Solano ,&nbsp;Juan Julio Morales Contreras","doi":"10.1016/j.jsames.2024.105238","DOIUrl":"10.1016/j.jsames.2024.105238","url":null,"abstract":"<div><div>While the great majority of paleomagnetic studies come from Central Mexico (Trans Mexican Volcanic Belt), still few works are available from Baja California peninsula. Twelve lava and domes from the Tres Vírgenes Volcanic Complex were sampled, and 96 standard paleomagnetic cores were analyzed. Available isotope ages range from 22 ka to 300 ka. Magnetic mineralogy analysis indicates that titanium-poor titanomagnetite is the main carrier of remanent magnetization, although some sites also contain Ti-rich titanomagnetites commonly observed in recent volcanic eruptions. Nine of the studied lavas yielded normal polarity magnetization with site mean declination ranging <span><math><mrow><mi>D</mi><mo>=</mo><mrow><mn>349</mn><mo>°</mo></mrow><mo>−</mo><mrow><mn>28.1</mn><mo>°</mo></mrow></mrow></math></span> and inclination <span><math><mrow><mi>I</mi><mo>=</mo><mrow><mn>32.4</mn><mo>°</mo></mrow><mo>−</mo><mrow><mn>55.4</mn><mo>°</mo></mrow></mrow></math></span> as expected for the Bruhnes chron. Mean paleodirections show remarkable coincidence with previously reported data from the nearby San Quintín volcanic field. The scatter parameter of the virtual geomagnetic poles <span><math><mrow><msub><mi>S</mi><mi>B</mi></msub><mo>=</mo><msubsup><mn>15.12</mn><mn>13.87</mn><mn>16.60</mn></msubsup></mrow></math></span> agrees, under uncertainties, with the latitude-dependent G Model of paleosecular variation for the Bruhnes chron. Both Thellier double heating and Tsunakawa-Shaw absolute paleointensity methods were applied, however, the success rate was relatively low with 4 reliable values ranging from <span><math><mrow><mn>21.46</mn><mspace></mspace><mi>μ</mi><mi>T</mi><mspace></mspace><mi>t</mi><mi>o</mi><mspace></mspace><mn>56.4</mn><mspace></mspace><mi>μ</mi><mi>T</mi></mrow></math></span>. One of the lava domes that we dated at 253 ± 24 ka using the U-Th systematics demonstrated the worldwide observed Calabrian Ridge 0 short-lived geomagnetic event.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105238"},"PeriodicalIF":1.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721647","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":"Ordovician and Devonian microfacies of Sierra Agua Verde, central Sonora, Mexico: A new locality of the Nuia Province from Western Laurentia","authors":"André Becuar-Daniels,&nbsp;Rogelio Monreal,&nbsp;Francisco Javier Cuen-Romero,&nbsp;Héctor Arturo Noriega-Ruiz,&nbsp;Juan José Palafox-Reyes","doi":"10.1016/j.jsames.2024.105208","DOIUrl":"10.1016/j.jsames.2024.105208","url":null,"abstract":"<div><div>The Lower Ordovician carbonate rocks exposed in the Tuntunudé hill north of the Sierra Agua Verde, northeast of the town of Mátape, in central Sonora, consists of intraformational breccia, conglomeratic limestone, sandy limestone and limestone, which are overlain by a mixed succession of quartz sandstone and dolomitic sandstone. This succession is in turn unconformably overlain by an Upper Devonian sequence of dolomitic limestone, marl, conglomeratic limestone and sandy dolomite. The Lower Ordovician rocks contain abundant bioclasts of gastropods, brachiopods, trilobites, echinoderms, and sponges. Their microfacies show a marine medium to low energy environment, with sedimentation dominated by distal tempestites in laminar stages and intraclast debris formation during deposition. The depositional paleoenvironment corresponds to a marine middle-to-outer ramp. These strata are characterized by conodonts belonging to the <em>Oepikodus communis</em> and <em>Reutterodus andinus</em> biozones, as well as cyanobacteria incertae sedis <em>Nuia sibirica</em>. Devonian rocks overlying the Ordovician strata contain bioturbation and abundant bioclasts of echinoderms, brachiopods, bryozoans, gastropods, chaetetiform sponges, stromatoporoids; and also, colonial corals like <em>Hexagonaria attenuata</em>, <em>Phillipsastrea hennahii</em> and <em>Phillipsastrea jachowiczi</em>, monothalamous foraminifera like <em>Vicin</em><em>e</em><em>sphaera</em> sp., monoserials such as <em>Tikhinella measpis</em> and planispiral such as <em>Nanicella gallowayi</em>. The microfacies show a high-energy environment in marine tropical shallow open-sea lagoonal waters, with ooids and reef building organisms.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"150 ","pages":"Article 105208"},"PeriodicalIF":1.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658256","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":"Taphonomic aspects of recent benthic foraminiferal assemblages, North Coast of the Sate of Bahia, Brazil","authors":"André Ramos Costa ,&nbsp;Zelinda Margarida Andrade Nery Leão ,&nbsp;Altair de Jesus Machado ,&nbsp;Isabel Honorata de Souza Azevedo ,&nbsp;Gabriela Santiago Mercês Pereira ,&nbsp;Marlene Campos Peso-Aguiar ,&nbsp;Simone Souza de Moraes","doi":"10.1016/j.jsames.2024.105239","DOIUrl":"10.1016/j.jsames.2024.105239","url":null,"abstract":"<div><div>This research focuses on the analysis of benthic foraminiferal assemblages in surface sediment samples from the seafloor, collected on the continental shelf adjacent to Arembepe Beach within the municipality of Camaçari, on the North Coast of the State of Bahia (Brazil). An industrial submarine outfall significantly influences this area. This study showcases the results of the spatio-temporal distribution of foraminiferal assemblages, their ecological characteristics, and the taphonomy of the foraminifera tests, relating them to the environmental sedimentary processes in the area. The benthic macroforaminifera-carrying symbionts dominate; they are indicative of shallow environments and are in line with the ecological needs of the fauna typical of warm and shallow tropical waters. The persistent spatio-temporal patterns suggest that despite moderate to high hydrodynamic energy, which is expected in shallow tropical shelf environments, it does not considerably impact the distribution of the foraminiferal assemblages. This reflects the uniformity in the faunal composition and the clear temporal continuity observed.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105239"},"PeriodicalIF":1.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704214","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":"Phosphatization in the São Pedro and São Paulo Archipelago (SPSPA), Equatorial Atlantic, Brazil: Insights from guano leaching and chemical weathering","authors":"Eduardo Baudson Duarte ,&nbsp;Angélica Fortes Drummond Chicarino Varajao ,&nbsp;Fábio Soares Oliveira ,&nbsp;Christophe Renac ,&nbsp;Carlos Ernesto Gonçalves Reynaud Schaefer ,&nbsp;Eduardo Osório Senra","doi":"10.1016/j.jsames.2024.105234","DOIUrl":"10.1016/j.jsames.2024.105234","url":null,"abstract":"<div><div>This research explores the phosphatization process in the São Pedro and São Paulo Archipelago (SPSPA), located in the Equatorial Atlantic, by analyzing the geochemical interactions between guano coatings and the underlying rocks. The study also examines the geochemical characteristics of the substrates, assessing the behavior of major, minor, trace, and rare earth elements, and determines the degree of weathering degradation of guano crusts, speleothems, peridotites and carbonate sedimentary rocks affected by environmental factors as rain, wind and halmyrolysis. The distribution of chemical elements in water-soluble, adsorbed, acid-extractable/exchangeable, readily acid and reducible, acid oxidizable, and residual phases were investigated. The principal findings of this method show that elevated Na levels are leached in water-soluble fractions, thereby highlighting the occurrence of rapid and active geochemical cycling, which is influenced by seawater. In contrast, in more acidic environments (pH close 4.8 to 2.0), considerable amounts of macroelements like P, Fe, Mg, Al, and Mn are found in association with remaining phases, indicating a slower and more incremental geochemical cycle of mature guano in the input and output systems of these nutrients in the archipelago. The mineralogy, as indicated by the presence of mafic minerals such as olivine, augite, and Cr-spinel, as well as phosphates including fluorapatite, collinsite, and spheniscidite, also supports this finding. The findings underscore the complex interplay between biological activities and geochemical processes, which influence the elemental dynamics in the phosphate-rich rocks of the SPSPA at depth. This study not only enhances our understanding of phosphatization processes but also offers important insights into the sustainable management of marine resources in environmentally sensitive areas. The research underscores the necessity of considering biological and environmental variables when examining geochemical cycles, particularly in regions exhibiting distinctive geological and biological interactions that challenge the prevailing models, such as those identified in the ASPSP.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"150 ","pages":"Article 105234"},"PeriodicalIF":1.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657994","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":"Necrophagous insect damage on Quaternary mammal bones from Brazilian caves: Taphonomic and paleoecological implications","authors":"Laís Alves-Silva ,&nbsp;Ronaldo Araujo Leoni ,&nbsp;Fernando Henrique de Souza Barbosa ,&nbsp;Hermínio Ismael de Araújo-Júnior","doi":"10.1016/j.jsames.2024.105236","DOIUrl":"10.1016/j.jsames.2024.105236","url":null,"abstract":"<div><div>Bioerosion on vertebrate bones provides valuable insights into the post-mortem history of paleocommunities. In this study, we analyzed bioerosion trace fossils on mammalian bones from the Gruta dos Brejões and Toca da Barriguda caves in Bahia, Brazil. Our findings document the occurrence of <em>Cubiculum inornatus</em> and <em>Karethraichnus kulindros</em> in the Pleistocene<em>.</em> Comparisons of these bioerosion traces with trace fossils reported in paleoichnological and neoichnological literature suggest that the traces likely resulted from the pupation of dermestid beetle larvae on carcasses prior to burial. We suggest that dermestid infestation occurred on dry corpses exposed on the surface, which were subsequently transported into the cave environments.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"150 ","pages":"Article 105236"},"PeriodicalIF":1.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657993","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}