João da Fonseca Gomes de Lemos, Geize Carolinne Correia Andrade Oliveira
Calcareous nannofossils of the Lower Tejo Basin Miocene, Portugal. This study presents the taxonomy, biostratigraphy, and paleoecology of calcareous nannofossils from an outcrop on the border of Foz da Fonte beach, geologically setting in the Neogene of the Lower Tejo Basin, Portugal. The taxonomic description allowed us to identify 19 calcareous nannofossils species belonging to ten genera (Helicosphaera, Pontosphaera, Reticulofenestra, Cyclicargolithus, Coccolithus, Discoaster, Sphenolithus, Umbilicosphaera, Calcidiscus, and Thoracosphaera). Based on the stratigraphic range of Discoaster druggii, Reticulofenestra lockeri and Helicosphaera ampliaperta the section was defined in the NN2 and CN1 biozones, within the Burdigalian (lower Miocene). Quantitative analysis showed a significant variation in species diversity as a function of depth, as well as a relationship between species richness and the calcium carbonate content present in these rocks. According to these data, mainly due to the abundance of Reticulofenestra spp., Coccolithus spp. and Helicosphaera spp., it is possible to infer that this was a nutrient-rich nearshore marine environment (eutrophic) influenced by warm water conditions. Keywords: calcareous nannofossils, taxonomy, biostratigraphy, paleoecology, Neogene, Lower Tejo Basin. RESUMO – Este estudo apresenta a taxonomia, bioestratigrafia e paleoecologia dos nanofosseis calcarios presentes nas rochas que afloram as margens da praia da Foz da Fonte, geologicamente pertencentes ao Neogeno da Bacia do Baixo Tejo, Portugal. A descricao taxonomica permitiu identificar 19 especies de nanofosseis calcarios pertencentes a dez generos (Helicosphaera, Pontosphaera, Reticulofenestra, Cyclicargolithus, Coccolithus, Discoaster, Sphenolithus, Umbilicosphaera, Calcidiscus e Thoracosphaera). Com base na distribuicao bioestratigrafica de Discoaster druggii, Reticulofenestra lockeri e Helicosphaera ampliaperta a secao foi definida pertencendo as biozonas NN2 e CN1, dentro do Burdigaliano (Mioceno inferior). A analise quantitativa mostrou significativa variacao na diversidade de especies em funcao da profundidade e, tambem, uma relacao entre a riqueza especifica e abundância com o teor de carbonato de calcio presente nas rochas. De acordo com esses dados, principalmente pela abundância de Reticulofenestra spp., Coccolithus spp. e Helicosphaera spp. e possivel inferir que tratava de um ambiente marinho proximo a costa, rico em nutrientes (eutrofico), influenciado por massas de aguas quentes. Palavras-chave: nanofosseis calcarios, taxonomia, bioestratigrafia, paleoecologia, Neogeno, Bacia do Baixo Tejo.
葡萄牙下特茹盆地中新世的钙质超微化石。本研究介绍了葡萄牙下特霍盆地新近系Foz da Fonte海滩边界露头的钙质超微化石的分类学、生物地层学和古生态学。分类描述使我们能够鉴定出19种钙质超微化石，隶属于10个属（Helicosphaera、Ponthopaera、Reticulfenestra、Cycicargolithus、Coccolithus、Discoaster、Sphenolithus、Umbilicophaera、Calcidesis和Thoracophaera）。根据Discoaster drugii、Reticulfenestra lockeri和Helicosphaera magnifaperta的地层范围，该剖面被定义在Burdigalian（下中新世）内的NN2和CN1生物带中。定量分析显示，物种多样性随着深度的变化而发生显著变化，物种丰富度与这些岩石中碳酸钙含量之间也存在关系。根据这些数据，主要由于网织开窗菌属、Coccolithus属和Helicosphaera属的丰度，可以推断这是一个受温水条件影响的营养丰富的近岸海洋环境（富营养化）。关键词：钙质纳米化石，分类学，生物地层学，古生态学，新近纪，下特茹盆地摘要——本研究介绍了在Foz da Fonte海滩海岸露头的岩石中存在的钙质纳米化石的分类学、生物地层学和古生态学，在地质学上属于葡萄牙Baixo-Tejo盆地的新近纪。分类描述允许鉴定出19种钙质纳米化石，属于10个大类（Helicosphaera、Pontosphaera，Reticulfenestra，Cycicargolithus，Coccolithus，Discoaster，Sphenolithus，Umbilichosphaera）。根据Discoaster drugii、Reticulfenestra lockeri和Helicosphaera amplifaperta的生物地层学分布，该剖面被定义为属于Burdigalian（下Myocene）内的NN2和CN1生物带。定量分析显示，物种多样性随着深度的变化而发生显著变化，特定丰富度和丰度与岩石中碳酸钙含量之间也存在关系。根据这些数据，主要是由于网状开窗菌属、Coccolithus属和Helicosphaera属的丰度，可以推断这是一个靠近海岸的海洋环境，富含营养物质（富营养化），受到热水团的影响。关键词：钙质纳米化石，分类学，生物地层学，古生态学，新近纪，拜克索特霍盆地。
{"title":"Nanofósseis calcários do Mioceno da Bacia do Baixo Tejo, Portugal","authors":"João da Fonseca Gomes de Lemos, Geize Carolinne Correia Andrade Oliveira","doi":"10.4072/RBP.2021.1.04","DOIUrl":"https://doi.org/10.4072/RBP.2021.1.04","url":null,"abstract":"Calcareous nannofossils of the Lower Tejo Basin Miocene, Portugal. This study presents the taxonomy, biostratigraphy, and paleoecology of calcareous nannofossils from an outcrop on the border of Foz da Fonte beach, geologically setting in the Neogene of the Lower Tejo Basin, Portugal. The taxonomic description allowed us to identify 19 calcareous nannofossils species belonging to ten genera (Helicosphaera, Pontosphaera, Reticulofenestra, Cyclicargolithus, Coccolithus, Discoaster, Sphenolithus, Umbilicosphaera, Calcidiscus, and Thoracosphaera). Based on the stratigraphic range of Discoaster druggii, Reticulofenestra lockeri and Helicosphaera ampliaperta the section was defined in the NN2 and CN1 biozones, within the Burdigalian (lower Miocene). Quantitative analysis showed a significant variation in species diversity as a function of depth, as well as a relationship between species richness and the calcium carbonate content present in these rocks. According to these data, mainly due to the abundance of Reticulofenestra spp., Coccolithus spp. and Helicosphaera spp., it is possible to infer that this was a nutrient-rich nearshore marine environment (eutrophic) influenced by warm water conditions.\u0000Keywords: calcareous nannofossils, taxonomy, biostratigraphy, paleoecology, Neogene, Lower Tejo Basin.\u0000RESUMO – Este estudo apresenta a taxonomia, bioestratigrafia e paleoecologia dos nanofosseis calcarios presentes nas rochas que afloram as margens da praia da Foz da Fonte, geologicamente pertencentes ao Neogeno da Bacia do Baixo Tejo, Portugal. A descricao taxonomica permitiu identificar 19 especies de nanofosseis calcarios pertencentes a dez generos (Helicosphaera, Pontosphaera, Reticulofenestra, Cyclicargolithus, Coccolithus, Discoaster, Sphenolithus, Umbilicosphaera, Calcidiscus e Thoracosphaera). Com base na distribuicao bioestratigrafica de Discoaster druggii, Reticulofenestra lockeri e Helicosphaera ampliaperta a secao foi definida pertencendo as biozonas NN2 e CN1, dentro do Burdigaliano (Mioceno inferior). A analise quantitativa mostrou significativa variacao na diversidade de especies em funcao da profundidade e, tambem, uma relacao entre a riqueza especifica e abundância com o teor de carbonato de calcio presente nas rochas. De acordo com esses dados, principalmente pela abundância de Reticulofenestra spp., Coccolithus spp. e Helicosphaera spp. e possivel inferir que tratava de um ambiente marinho proximo a costa, rico em nutrientes (eutrofico), influenciado por massas de aguas quentes.\u0000Palavras-chave: nanofosseis calcarios, taxonomia, bioestratigrafia, paleoecologia, Neogeno, Bacia do Baixo Tejo.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":"24 1","pages":"47-61"},"PeriodicalIF":0.7,"publicationDate":"2021-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45112119","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}
A. M. Siegloch, M. Guerra-Sommer, C. Schultz, E. Barboza
The goals of this study were to establish patterns in a silicified wood assemblage to depict the evolution patterns of the Triassic paleoclimate in southern Brazilian Gondwana during an interval of global arid to semi-arid climatic context, and the taphonomic process that led to the preservation of the so-called “Petrified Forest”, which is preserved in the central area of the state of Rio Grande do Sul. Analyses were developed with an assemblage of 13 permineralized conifer wood, using standard thin sections, whose anatomical details were studied in transmitted light. Ground-Penetrating Radar was used to obtain information about the depositional characteristics of the site. Main results are: true growth rings are absent in all samples, and the boundaries of the interruption zones are marked by an abrupt decline in cell diameter, but they are not accompanied by a reduction of cell wall thickness. The subsequent reversion to normal tracheid diameter is also abrupt, revealing the return of the previous growing conditions. Ground-penetrating Radar analyses confirmed that the Mata Sequence deposits correspond to a river. The identification of growth interruption zones in a Late Triassic wood assemblage in southernmost Brazilian Gondwana (Paleobotanic Garden of the city of Mata, RS) indicates the presence of tropical, temporarily dry climate conditions, characterized by irregular, short-term environmental disturbances to growth. The taphonomic process was related to a river-channel infilling depositional process, under the influence of high-energy flood events that dragged and buried the trees. Keywords: Wood growth patterns, Mata sequence, gymnosperms, Triassic climate, petrified forest. RESUMO – O objetivo do presente trabalho foi obter assinaturas climaticas por meio da analise de padroes de crescimento em uma associacao de lenhos silicificados a fim de retratar os padroes de evolucao do paleoclima no Triassico no Gondwana sul-brasileiro durante um intervalo de condicoes climaticas globais aridas-semiaridas e esclarecer o contexto sedimentar e o processo tafonomico relacionado a preservacao da “Floresta Petrificada”, preservada na area central do Estado do Rio Grande do Sul. Secoes delgadas foram elaboradas a partir de 13 amostras de lenhos permineralizados, sendo os detalhes anatomicos estudados em microscopia optica sob luz transmitida. A tecnica de Penetracao do Solo por Radar (Ground Penetrating Radar - GPR) foi utilizada para obter informacoes sobre as caracteristicas deposicionais. Os principais resultados foram: ausencia de verdadeiros aneis de crescimento nas amostras e todos os especimes sao caracterizados por interrupcoes de crescimento concentricas. Os limites das zonas de interrupcao sao marcados por um declinio abrupto no diâmetro da celula, mas nao sao acompanhados por uma reducao da espessura da parede celular. A reversao subsequente para o diâmetro traqueideo normal tambem e abrupta, revelando o retorno das condicoes de crescimento
本研究的目的是在硅化木组合中建立模式，以描述全球干旱至半干旱气候背景下巴西冈瓦纳南部三叠纪古气候的演化模式，以及导致所谓的“石化森林”得以保存的地学过程，该地学过程保存在巴西南里约热内卢格兰德州中部地区。使用标准薄片对13种过矿化针叶树木材进行了分析，并在透射光下研究了其解剖细节。利用探地雷达获得有关该地点沉积特征的信息。主要结果是:在所有样品中都没有真正的生长环，并且中断区的边界以细胞直径的突然下降为标志，但它们并不伴随着细胞壁厚度的减少。随后向正常气管直径的恢复也是突然的，显示了先前生长条件的恢复。探地雷达分析证实，玛塔层序沉积物对应于一条河流。巴西冈瓦纳最南端(马塔市古植物园)晚三叠世木材组合中生长中断带的确定表明存在热带，暂时干燥的气候条件，其特征是不规则的，短期环境干扰生长。埋藏过程与河道淤积过程有关，是在高能量洪水事件的影响下，将树木拖拽掩埋的。关键词:木材生长模式，Mata序列，裸子植物，三叠纪气候，石化林摘要:目的:为研究不同地区的自然气候变化提供参考，分析不同地区的自然气候变化，分析不同地区的自然气候变化，分析不同地区的自然气候变化，分析不同地区的自然气候变化，分析不同地区的古气候变化，分析不同地区的古气候变化，分析不同地区的古气候变化，分析不同地区的古气候变化，分析不同地区的古气候变化，分析不同地区的全球气候变化，分析不同地区的气候变化，分析不同地区的沉积过程，分析不同地区的沉积过程，分析不同地区的沉积过程，分析不同地区的沉积过程，分析不同地区的沉积过程，分析不同地区的沉积过程。从解剖角度看，解剖角度看，解剖角度看，透视角度看，透视角度看，透视角度看，透视角度看，透视角度看。探地雷达(GPR)技术是一种利用地层特征等参数信息进行探测的技术。其主要成果是:从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看，从纵向上看。因此，在细胞发育过程中，当细胞发育过程中出现异常现象时，就会出现异常现象。一个反向的随后的para, di metro traquedeo正常的tambebee突然发生，揭示了在前渐行渐近的条件下，反向的条件。根据地质探地雷达的分析，确定了地质层序中沉积物的特征，并对加拿大河流的预防进行了相应的澄清。一个相同的区域，从中断区到渐变区，从渐变区到渐变区，从渐变区到渐变区，从渐变区到渐变区，从渐变区到渐变区，从渐变区到渐变区，从渐变区到渐变区，从渐变区到渐变区，再到渐变区。一个历史经济学家认为，加拿大河流预防过程的关系，即洪水的影响，即能源的影响，即河流的影响，即河流的影响，即河流的影响。植物:生长中断带、Mata序列、裸子植物、三叠纪植物、石化花。
{"title":"Paleoclimatic inferences based on wood growth interruptions in Late Triassic flood deposits from the southernmost Brazilian Gondwana","authors":"A. M. Siegloch, M. Guerra-Sommer, C. Schultz, E. Barboza","doi":"10.4072/RBP.2021.1.01","DOIUrl":"https://doi.org/10.4072/RBP.2021.1.01","url":null,"abstract":"The goals of this study were to establish patterns in a silicified wood assemblage to depict the evolution patterns of the Triassic paleoclimate in southern Brazilian Gondwana during an interval of global arid to semi-arid climatic context, and the taphonomic process that led to the preservation of the so-called “Petrified Forest”, which is preserved in the central area of the state of Rio Grande do Sul. Analyses were developed with an assemblage of 13 permineralized conifer wood, using standard thin sections, whose anatomical details were studied in transmitted light. Ground-Penetrating Radar was used to obtain information about the depositional characteristics of the site. Main results are: true growth rings are absent in all samples, and the boundaries of the interruption zones are marked by an abrupt decline in cell diameter, but they are not accompanied by a reduction of cell wall thickness. The subsequent reversion to normal tracheid diameter is also abrupt, revealing the return of the previous growing conditions. Ground-penetrating Radar analyses confirmed that the Mata Sequence deposits correspond to a river. The identification of growth interruption zones in a Late Triassic wood assemblage in southernmost Brazilian Gondwana (Paleobotanic Garden of the city of Mata, RS) indicates the presence of tropical, temporarily dry climate conditions, characterized by irregular, short-term environmental disturbances to growth. The taphonomic process was related to a river-channel infilling depositional process, under the influence of high-energy flood events that dragged and buried the trees.\u0000Keywords: Wood growth patterns, Mata sequence, gymnosperms, Triassic climate, petrified forest.\u0000RESUMO – O objetivo do presente trabalho foi obter assinaturas climaticas por meio da analise de padroes de crescimento em uma associacao de lenhos silicificados a fim de retratar os padroes de evolucao do paleoclima no Triassico no Gondwana sul-brasileiro durante um intervalo de condicoes climaticas globais aridas-semiaridas e esclarecer o contexto sedimentar e o processo tafonomico relacionado a preservacao da “Floresta Petrificada”, preservada na area central do Estado do Rio Grande do Sul. Secoes delgadas foram elaboradas a partir de 13 amostras de lenhos permineralizados, sendo os detalhes anatomicos estudados em microscopia optica sob luz transmitida. A tecnica de Penetracao do Solo por Radar (Ground Penetrating Radar - GPR) foi utilizada para obter informacoes sobre as caracteristicas deposicionais. Os principais resultados foram: ausencia de verdadeiros aneis de crescimento nas amostras e todos os especimes sao caracterizados por interrupcoes de crescimento concentricas. Os limites das zonas de interrupcao sao marcados por um declinio abrupto no diâmetro da celula, mas nao sao acompanhados por uma reducao da espessura da parede celular. A reversao subsequente para o diâmetro traqueideo normal tambem e abrupta, revelando o retorno das condicoes de crescimento ","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":"24 1","pages":"3-20"},"PeriodicalIF":0.7,"publicationDate":"2021-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47100028","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}
A robust biostratigraphic zonation based on microfossils supports the stratigraphic framework and correlation of the interior basins of the Lower Cretaceous of NE Brazil. This zonation has also allowed correlations with coeval sections in the Brazilian marginal basins and in the Gabon and Congo basins (central-west Africa). These records, consisting mainly of non-marine sediments, were a great challenge with regard to the correlation with the International Chronostratigraphic Chart. Therefore, local stages were used, the most recent being the Alagoas local Brazilian Stage, with which the Post-rift Sequence I of the Araripe Basin is related. Regarding lithostratigraphy, this sequence includes the Rio da Batateira (Barbalha for some authors) and Santana formations, the last one with the famous Crato, Ipubi, and Romualdo members, from the base to the top. Although currently there is a consensus on the age of the Alagoas local Brazilian Stage in the Araripe Basin, recently a new age for at least part of the Post-rift Sequence I was proposed. This new proposal, based on isotopic analysis of Re-Os, arose as a panacea to correlate the Rio da Batateira Formation and the Crato and Ipubi members with the international stages. Surprisingly, their authors, although on the one hand, they seem to underestimate biostratigraphic results, on the other they seek to support their proposal from microfossils studied by previous authors, but they do so in an inappropriate way, leading readers to misinterpret their results. Therefore, this paper presents a critical review on the age of the Alagoas local Brazilian Stage in the Araripe Basin and nearby basins, refuting a Barremian age for part of the Post-rift Sequence I. Keywords: Alagoas local Brazilian Stage, biostratigraphy, ostracods, palynomorphs, radiometric ages. RESUMO – Um robusto zoneamento bioestratigrafico baseado em microfosseis suporta o arcabouco estratigrafico e a correlacao dos estratos eocretaceos das bacias interiores do NE do Brasil. Esse zoneamento permite tambem correlacoes com secoes coevas nas bacias marginais brasileiras e nas bacias do Gabao e Congo (centro-oeste da Africa). Tais registros, compostos principalmente por sedimentos nao-marinhos, foram um grande desafio em termos de correlacao com a Tabela Cronoestratigrafica Internacional. Assim, foram empregados andares locais, sendo o estratigraficamente mais alto o Andar Alagoas, com o qual a Sequencia Pos-rifte I da Bacia do Araripe esta relacionada. Quanto a litoestratigrafia, essa sequencia inclui as formacoes Rio da Batateira (Barbalha para alguns autores) e Santana, a qual esta subdividida nos famosos membros Crato, Ipubi e Romualdo, da base para o topo. Embora atualmente haja consenso sobre a idade do Andar Alagoas naBacia do Araripe, recentemente foi proposta uma nova idade para parte da Sequencia Pos-rifte I. Essa nova proposta, baseada em analises isotopicas de Re-Os, foi apresentada como uma panaceia para correlacionar a formacao Rio
基于微化石的强有力的生物地层学分带支持了巴西东北部下白垩统内部盆地的地层格架和对比。这种分带也允许与巴西边缘盆地和加蓬和刚果盆地(中非西部)的同期剖面进行对比。这些记录主要由非海相沉积物组成，在与国际年代地层图的对比方面是一个巨大的挑战。因此，采用局部阶段，最近的是阿拉戈斯局部巴西阶段，与Araripe盆地的后裂谷层序I有关。在岩石地层方面，该层序从底部到顶部包括里约热内卢da Batateira(有些作者称之为Barbalha)和Santana组，最后是著名的Crato、Ipubi和Romualdo组。尽管目前对于Araripe盆地的Alagoas当地巴西阶段的年龄已经达成共识，但最近提出了至少部分后裂谷层序I的新时代。这一基于Re-Os同位素分析的新建议，作为将bbb100 da Batateira组和Crato和Ipubi成员与国际舞台联系起来的灵丹妙药。令人惊讶的是，他们的作者一方面似乎低估了生物地层学的结果，另一方面又试图从前人研究过的微化石中寻求支持，但他们这样做的方式不恰当，导致读者误解了他们的结果。因此，本文对Araripe盆地及附近盆地的Alagoas局部巴西阶段的年龄进行了批判性的回顾，反驳了部分后裂谷层序i的巴雷米亚时代。关键词:Alagoas局部巴西阶段，生物地层学，介形类，岩形，辐射年龄。在巴西东北地区，利用微化石支持的arcabouco地层特征，建立了一套完整的生物地层特征带，并与e白垩纪地层和bacias interioes地层进行了对比。区域修正案允许各地区的相关人员，如巴西边缘地区、刚果中部地区和刚果中部地区的相关人员。这些记录，主要的复合材料，主要的沉积物，主要的海洋沉积物，有孔层和大的地层分析，以及相关的术语，国际地层表。阿西姆，形成了empregados和ares locais，在安达拉戈亚斯的主要地区进行了地层划分，并与“后地层序列”和“盆地与地区关系”相一致。该序列包括Barbalha para alguns autores (Barbalha para alguns autores)和Santana (Santana)，是著名成员Crato, Ipubi和Romualdo的一个相同的分支，数据库基础para to topo。最近的一项研究表明，最近的一项研究表明，在新发现的基础上，对Re-Os的同位素进行了基础分析，在新发现的基础上，对新发现的同位素进行了分析，并在新发现的基础上，对新发现的同位素进行了对比分析，并在新发现的基础上，对新发现的同位素进行了对比分析。观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，解释，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察，观察。研究:安达拉戈亚斯，生物地层学，介形虫，白斑虫，放射学，生物地层学。
{"title":"Age of the Post-rift Sequence I from the Araripe Basin, Lower Cretaceous, NE Brazil: implications for spatio-temporal correlation","authors":"J. Coimbra, Tiago Freire","doi":"10.4072/RBP.2021.1.03","DOIUrl":"https://doi.org/10.4072/RBP.2021.1.03","url":null,"abstract":"A robust biostratigraphic zonation based on microfossils supports the stratigraphic framework and correlation of the interior basins of the Lower Cretaceous of NE Brazil. This zonation has also allowed correlations with coeval sections in the Brazilian marginal basins and in the Gabon and Congo basins (central-west Africa). These records, consisting mainly of non-marine sediments, were a great challenge with regard to the correlation with the International Chronostratigraphic Chart. Therefore, local stages were used, the most recent being the Alagoas local Brazilian Stage, with which the Post-rift Sequence I of the Araripe Basin is related. Regarding lithostratigraphy, this sequence includes the Rio da Batateira (Barbalha for some authors) and Santana formations, the last one with the famous Crato, Ipubi, and Romualdo members, from the base to the top. Although currently there is a consensus on the age of the Alagoas local Brazilian Stage in the Araripe Basin, recently a new age for at least part of the Post-rift Sequence I was proposed. This new proposal, based on isotopic analysis of Re-Os, arose as a panacea to correlate the Rio da Batateira Formation and the Crato and Ipubi members with the international stages. Surprisingly, their authors, although on the one hand, they seem to underestimate biostratigraphic results, on the other they seek to support their proposal from microfossils studied by previous authors, but they do so in an inappropriate way, leading readers to misinterpret their results. Therefore, this paper presents a critical review on the age of the Alagoas local Brazilian Stage in the Araripe Basin and nearby basins, refuting a Barremian age for part of the Post-rift Sequence I.\u0000Keywords: Alagoas local Brazilian Stage, biostratigraphy, ostracods, palynomorphs, radiometric ages.\u0000RESUMO – Um robusto zoneamento bioestratigrafico baseado em microfosseis suporta o arcabouco estratigrafico e a correlacao dos estratos eocretaceos das bacias interiores do NE do Brasil. Esse zoneamento permite tambem correlacoes com secoes coevas nas bacias marginais brasileiras e nas bacias do Gabao e Congo (centro-oeste da Africa). Tais registros, compostos principalmente por sedimentos nao-marinhos, foram um grande desafio em termos de correlacao com a Tabela Cronoestratigrafica Internacional. Assim, foram empregados andares locais, sendo o estratigraficamente mais alto o Andar Alagoas, com o qual a Sequencia Pos-rifte I da Bacia do Araripe esta relacionada. Quanto a litoestratigrafia, essa sequencia inclui as formacoes Rio da Batateira (Barbalha para alguns autores) e Santana, a qual esta subdividida nos famosos membros Crato, Ipubi e Romualdo, da base para o topo. Embora atualmente haja consenso sobre a idade do Andar Alagoas naBacia do Araripe, recentemente foi proposta uma nova idade para parte da Sequencia Pos-rifte I. Essa nova proposta, baseada em analises isotopicas de Re-Os, foi apresentada como uma panaceia para correlacionar a formacao Rio","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":"24 1","pages":"37-46"},"PeriodicalIF":0.7,"publicationDate":"2021-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46402013","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":"Agathoxylon santacruzense Kloster & Gnaedinger from the Lower–Middle Jurassic Kota Formation, India and its paleoenvironmental implications","authors":"C. Chinnappa, P. S. Kavali","doi":"10.4072/rbp.2020.4.01","DOIUrl":"https://doi.org/10.4072/rbp.2020.4.01","url":null,"abstract":"","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49164397","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}
L. Kerber, A. Martinelli, P. Rodrigues, A. M. Ribeiro, C. Schultz, M. Soares
{"title":"New record of Prozostrodon brasiliensis (Eucynodontia: Prozostrodontia) from its type-locality (Upper Triassic, Southern Brazil): comments on the endocranial morphology","authors":"L. Kerber, A. Martinelli, P. Rodrigues, A. M. Ribeiro, C. Schultz, M. Soares","doi":"10.4072/rbp.2020.4.04","DOIUrl":"https://doi.org/10.4072/rbp.2020.4.04","url":null,"abstract":"","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":"23 1","pages":"259-269"},"PeriodicalIF":0.7,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45519160","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}
Federico L. Agnolin, Nicolas Chimento, Marcelo R. Bruyere
{"title":"Presencia de Proterotheriidae (Mammalia, Litopterna) en el Pleistoceno de las Pampas Bonaerenses","authors":"Federico L. Agnolin, Nicolas Chimento, Marcelo R. Bruyere","doi":"10.4072/rbp.2020.4.05","DOIUrl":"https://doi.org/10.4072/rbp.2020.4.05","url":null,"abstract":"","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45388997","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}
Veridiana Ribeiro, M. Guerra-Sommer, R. Menegat, Lidia A. Kuhn, J. Simões, Ricardo Burgo Braga, S. G. Bauermann, Wagner G. Silva
{"title":"Fire events and vegetation dynamics during the late Pleistocene-Meghalayan interval in the southernmost Brazilian coastal plain","authors":"Veridiana Ribeiro, M. Guerra-Sommer, R. Menegat, Lidia A. Kuhn, J. Simões, Ricardo Burgo Braga, S. G. Bauermann, Wagner G. Silva","doi":"10.4072/rbp.2020.4.02","DOIUrl":"https://doi.org/10.4072/rbp.2020.4.02","url":null,"abstract":"","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":"23 1","pages":"234-250"},"PeriodicalIF":0.7,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44838585","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":"Reconstrução da temperatura e da precipitação média anual com base em acumulações de macrorrestos vegetais da Bacia do Rio Itanhaém, São Paulo, Brasil","authors":"Francisco Santiago, F. Ricardi-Branco","doi":"10.4072/rbp.2020.4.03","DOIUrl":"https://doi.org/10.4072/rbp.2020.4.03","url":null,"abstract":"","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":"23 1","pages":"251-258"},"PeriodicalIF":0.7,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47824109","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 new invertebrate from the Ponta Grossa Formation (Devonian), Paraná Basin, Brazil","authors":"A. Chahud, T. Fairchild","doi":"10.4072/rbp.2020.4.06","DOIUrl":"https://doi.org/10.4072/rbp.2020.4.06","url":null,"abstract":"","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42927183","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}
The Janner site (Upper Triassic of Southern Brazil) has been intensely explored, yielding constant new findings in recent years. Among these some fragmentary dinosaur specimens still not published were sampled. In this contribution, we describe these specimens, which represent five individuals, in order to increase our understanding on the anatomy of the dinosaurs that compose the paleofauna of the Janner site. The specimen CAPPA/UFSM 0270 is comprised of a series of six articulated presacral vertebrae, plus two isolated vertebrae associated with a right femur. UFRGS-PV-1232-T comprises a sacrum and a left ilium. CAPPA/UFSM 0271 comprises a right humerus that lacks the middle portion of the diaphysis. CAPPA/UFSM 00272 and 2073 are both comprised of an isolated femur each. The fragmentary condition of the materials hampers any less inclusive assignation. However, the morphology of the elements resembles those of coeval dinosaurs. Furthermore, the new specimens increase our knowledge on the morphology of some structures poorly understood from the dinosaurs of Janner site, such as the hindlimb and axial skeleton. Keywords: Hyperodapedon Assemblage Zone, Carnian, Saurischia, Sauropodomorpha, Archosauria, Dinosauria. O sitio Janner (Triassico Superior do Sul do Brasil) tem sido explorado intensamente, produzindo constantes novos achados nos ultimos anos. Dentre estes, restos de dinossauros ainda nao publicados foram recuperados. Nesta contribuicao nos descrevemos estes especimes, que totalizam cinco individuos, com o objetivo de aumentar o entendimento sobre a anatomia e amostragem de dinossauros que compoem o conteudo paleofaunistico do sitio Janner. O especime CAPPA/UFSM 0270 e composto por uma serie de seis vertebras pre-sacrais articuladas, alem de duas vertebras isoladas e um femur direito. UFRGS-PV-1232-T corresponde a um sacro e um ilio esquerdo. CAPPA/UFSM 0271 compreende um umero direito que carece de sua diafise. CAPPA/UFSM 0272 e 0273 compreendem um femur isolado cada. A condicao fragmentaria dos especimes impede uma atribuicao taxonomica menos inclusiva. Porem, a morfologia dos elementos lembra a de dinossauros coevos. Alem disso, os novos especimes aumentam nosso conhecimento sobre a morfologia de estruturas ainda pouco conhecidas de dinossauros do sitio Janner, como o membro anterior e o esqueleto axial. Palavras-chave: Zona de Associacao de Hyperodapedon, Carniano, Saurischia, Sauropodomorpha, Archosauria, Dinosauria.
{"title":"Comments on additional dinosaur specimens from the Janner site (Upper Triassic of the Paraná Basin), southern Brazil","authors":"R. Müller","doi":"10.4072/rbp.2020.3.02","DOIUrl":"https://doi.org/10.4072/rbp.2020.3.02","url":null,"abstract":"The Janner site (Upper Triassic of Southern Brazil) has been intensely explored, yielding constant new findings in recent years. Among these some fragmentary dinosaur specimens still not published were sampled. In this contribution, we describe these specimens, which represent five individuals, in order to increase our understanding on the anatomy of the dinosaurs that compose the paleofauna of the Janner site. The specimen CAPPA/UFSM 0270 is comprised of a series of six articulated presacral vertebrae, plus two isolated vertebrae associated with a right femur. UFRGS-PV-1232-T comprises a sacrum and a left ilium. CAPPA/UFSM 0271 comprises a right humerus that lacks the middle portion of the diaphysis. CAPPA/UFSM 00272 and 2073 are both comprised of an isolated femur each. The fragmentary condition of the materials hampers any less inclusive assignation. However, the morphology of the elements resembles those of coeval dinosaurs. Furthermore, the new specimens increase our knowledge on the morphology of some structures poorly understood from the dinosaurs of Janner site, such as the hindlimb and axial skeleton.\u0000Keywords: Hyperodapedon Assemblage Zone, Carnian, Saurischia, Sauropodomorpha, Archosauria, Dinosauria.\u0000O sitio Janner (Triassico Superior do Sul do Brasil) tem sido explorado intensamente, produzindo constantes novos achados nos ultimos anos. Dentre estes, restos de dinossauros ainda nao publicados foram recuperados. Nesta contribuicao nos descrevemos estes especimes, que totalizam cinco individuos, com o objetivo de aumentar o entendimento sobre a anatomia e amostragem de dinossauros que compoem o conteudo paleofaunistico do sitio Janner. O especime CAPPA/UFSM 0270 e composto por uma serie de seis vertebras pre-sacrais articuladas, alem de duas vertebras isoladas e um femur direito. UFRGS-PV-1232-T corresponde a um sacro e um ilio esquerdo. CAPPA/UFSM 0271 compreende um umero direito que carece de sua diafise. CAPPA/UFSM 0272 e 0273 compreendem um femur isolado cada. A condicao fragmentaria dos especimes impede uma atribuicao taxonomica menos inclusiva. Porem, a morfologia dos elementos lembra a de dinossauros coevos. Alem disso, os novos especimes aumentam nosso conhecimento sobre a morfologia de estruturas ainda pouco conhecidas de dinossauros do sitio Janner, como o membro anterior e o esqueleto axial.\u0000Palavras-chave: Zona de Associacao de Hyperodapedon, Carniano, Saurischia, Sauropodomorpha, Archosauria, Dinosauria.","PeriodicalId":49616,"journal":{"name":"Revista Brasileira De Paleontologia","volume":"23 1","pages":"171-184"},"PeriodicalIF":0.7,"publicationDate":"2020-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48632708","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}
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