Os temas geológicos são abordados no ensino fundamental dentro do conteúdo programático das disci... more Os temas geológicos são abordados no ensino fundamental dentro do conteúdo programático das disciplinas de Ciências e Ge-ografia e, portanto, podem ocupar muitas vezes um papel secundário. A proposta deste trabalho foi aproximar a universidade do ensino básico, popularizando determinados conceitos e conteúdos por meio de ações com estudantes da graduação e do ensino fundamental. A iniciativa buscou tratar do tema “O Interior da Terra” com base em experimentos que permitissem enten-der os fenômenos geológicos e os processos que ocorrem nas subdivisões internas conhecidas. Estes experimentos buscaram reproduzir, de maneira simples, e com uso de materiais alternativos e de baixo custo, os padrões observados da micro à ma-croescala nos fenômenos naturais. Os experimentos foram elaborados por um grupo de discentes do componente curricular Geologia Histórica, do curso de bacharelado em Geologia na Universidade Federal de Roraima, sob orientação dos professores desta disciplina, e apresent...
New material of Tapirus from the late Pleistocene of Rio Grande do Sul State is described, and ot... more New material of Tapirus from the late Pleistocene of Rio Grande do Sul State is described, and other specimens previously collected are reviewed. The material comes from Alegrete (Sanga da Cruz Creek), Dom Pedrito (São Luiz cattle ranch), Iraí, Quaraí (Cerro da Tapera), and Santa Vitória do Palmar (Hermenegildo Beach). The specimens from Iraí are referred to the extant species, T. terrestris, on the basis of their size and morphology. Specimens from Sanga da Cruz Creek, Hermenegildo Beach, São Luiz cattle ranch and Cerro da Tapera are very fragmentary or present no diagnostic characters, and are tentatively assigned to Tapirus cf. T. terrestris. We confirm the presence of the T. terrestris in the upper Pleistocene of Rio Grande do Sul state. Currently, there are neither archaeological nor historical records of this species for the southern region of this state.
The coastal plain of the state of Rio Grande do Sul, in southern Brazil, includes four barrier-la... more The coastal plain of the state of Rio Grande do Sul, in southern Brazil, includes four barrier-lagoon depositional systems formed by successive Quaternary sea-level highstands that were correlated to marine isotope stages (MIS) 11, 9, 5 and 1, despite the scarcity of absolute ages. This study describes a sea-level highstand older than MIS 5, based on the stratigraphy, ages and fossils of the shallow marine facies found in coastal barrier (Barrier II). This facies outcrops along the banks of Chuí Creek, it is composed of fine, well-sorted quartz sand and contains ichnofossils Ophiomorpha nodosa and Rosselia sp., and molluscan shells. The sedimentary record indicates coastal aggradation followed by sea-level fall and progradation of the coastline. Thermoluminescence (TL) and electron spin resonance (ESR) ages from sediments and fossil shells point to an age of ∼220 ka for the end of this marine transgression, thus correlating it to MIS 7 (substage 7e). Altimetric data point to a maxim...
All known species of extant tapirs are allopatric: 1 in southeastern Asia and 3 in Central and So... more All known species of extant tapirs are allopatric: 1 in southeastern Asia and 3 in Central and South America. The fossil record for tapirs, however, is much wider in geographical range, including Europe, Asia, and North and South America, going back to the late Oligocene, making the present distribution a relict of the original one. We here describe a new species of living Tapirus from the Amazon rain forest, the 1st since T. bairdii Gill, 1865, and the 1st new Perissodactyla in more than 100 years, from both morphological and molecular characters. It is shorter in stature than T. terrestris (Linnaeus, 1758) and has distinctive skull morphology, and it is basal to the clade formed by T. terrestris and T. pinchaque (Roulin, 1829). This highlights the unrecognized biodiversity in western Amazonia, where the biota faces increasing threats. Local peoples have long recognized our new species, suggesting a key role for traditional knowledge in understanding the biodiversity of the region.
Abstract Wood fossil charcoal is identified from the upper Lower Cretaceous (Serra do Tucano Form... more Abstract Wood fossil charcoal is identified from the upper Lower Cretaceous (Serra do Tucano Formation, Aptian–Albian) of Roraima (North Brazil). The presence of charcoal demonstrates the occurrence of Early Cretaceous palaeo-wildfires for the first time in this region and only the third time for the entirety of South America. A gymnospermous taxonomic affinity can be established for the charred woods and a relationship with conifers is likely, thus providing additional evidence for the taxonomic composition of Early Cretaceous floras in this region.
Os temas geológicos são abordados no ensino fundamental dentro do conteúdo programático das disci... more Os temas geológicos são abordados no ensino fundamental dentro do conteúdo programático das disciplinas de Ciências e Ge-ografia e, portanto, podem ocupar muitas vezes um papel secundário. A proposta deste trabalho foi aproximar a universidade do ensino básico, popularizando determinados conceitos e conteúdos por meio de ações com estudantes da graduação e do ensino fundamental. A iniciativa buscou tratar do tema “O Interior da Terra” com base em experimentos que permitissem enten-der os fenômenos geológicos e os processos que ocorrem nas subdivisões internas conhecidas. Estes experimentos buscaram reproduzir, de maneira simples, e com uso de materiais alternativos e de baixo custo, os padrões observados da micro à ma-croescala nos fenômenos naturais. Os experimentos foram elaborados por um grupo de discentes do componente curricular Geologia Histórica, do curso de bacharelado em Geologia na Universidade Federal de Roraima, sob orientação dos professores desta disciplina, e apresent...
New material of Tapirus from the late Pleistocene of Rio Grande do Sul State is described, and ot... more New material of Tapirus from the late Pleistocene of Rio Grande do Sul State is described, and other specimens previously collected are reviewed. The material comes from Alegrete (Sanga da Cruz Creek), Dom Pedrito (São Luiz cattle ranch), Iraí, Quaraí (Cerro da Tapera), and Santa Vitória do Palmar (Hermenegildo Beach). The specimens from Iraí are referred to the extant species, T. terrestris, on the basis of their size and morphology. Specimens from Sanga da Cruz Creek, Hermenegildo Beach, São Luiz cattle ranch and Cerro da Tapera are very fragmentary or present no diagnostic characters, and are tentatively assigned to Tapirus cf. T. terrestris. We confirm the presence of the T. terrestris in the upper Pleistocene of Rio Grande do Sul state. Currently, there are neither archaeological nor historical records of this species for the southern region of this state.
The coastal plain of the state of Rio Grande do Sul, in southern Brazil, includes four barrier-la... more The coastal plain of the state of Rio Grande do Sul, in southern Brazil, includes four barrier-lagoon depositional systems formed by successive Quaternary sea-level highstands that were correlated to marine isotope stages (MIS) 11, 9, 5 and 1, despite the scarcity of absolute ages. This study describes a sea-level highstand older than MIS 5, based on the stratigraphy, ages and fossils of the shallow marine facies found in coastal barrier (Barrier II). This facies outcrops along the banks of Chuí Creek, it is composed of fine, well-sorted quartz sand and contains ichnofossils Ophiomorpha nodosa and Rosselia sp., and molluscan shells. The sedimentary record indicates coastal aggradation followed by sea-level fall and progradation of the coastline. Thermoluminescence (TL) and electron spin resonance (ESR) ages from sediments and fossil shells point to an age of ∼220 ka for the end of this marine transgression, thus correlating it to MIS 7 (substage 7e). Altimetric data point to a maxim...
All known species of extant tapirs are allopatric: 1 in southeastern Asia and 3 in Central and So... more All known species of extant tapirs are allopatric: 1 in southeastern Asia and 3 in Central and South America. The fossil record for tapirs, however, is much wider in geographical range, including Europe, Asia, and North and South America, going back to the late Oligocene, making the present distribution a relict of the original one. We here describe a new species of living Tapirus from the Amazon rain forest, the 1st since T. bairdii Gill, 1865, and the 1st new Perissodactyla in more than 100 years, from both morphological and molecular characters. It is shorter in stature than T. terrestris (Linnaeus, 1758) and has distinctive skull morphology, and it is basal to the clade formed by T. terrestris and T. pinchaque (Roulin, 1829). This highlights the unrecognized biodiversity in western Amazonia, where the biota faces increasing threats. Local peoples have long recognized our new species, suggesting a key role for traditional knowledge in understanding the biodiversity of the region.
Abstract Wood fossil charcoal is identified from the upper Lower Cretaceous (Serra do Tucano Form... more Abstract Wood fossil charcoal is identified from the upper Lower Cretaceous (Serra do Tucano Formation, Aptian–Albian) of Roraima (North Brazil). The presence of charcoal demonstrates the occurrence of Early Cretaceous palaeo-wildfires for the first time in this region and only the third time for the entirety of South America. A gymnospermous taxonomic affinity can be established for the charred woods and a relationship with conifers is likely, thus providing additional evidence for the taxonomic composition of Early Cretaceous floras in this region.
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