Noasaurines form an enigmatic group of small-bodied predatory theropod dinosaurs known from the Late Cretaceous of Gondwana. They are relatively rare, with notable records in Argentina and Madagascar, and possible remains reported for Brazil, India, and continental Africa. In south-central Brazil, the deposits of the Bauru Basin have yielded a rich tetrapod fauna, which is concentrated in the Bauru Group. The mainly aeolian deposits of the Caiuá Group, on the contrary, bear a scarce fossil record composed only of lizards, turtles, and pterosaurs. Here, we describe the first dinosaur of the Caiuá Group, which also represents the best-preserved theropod of the entire Bauru Basin known to date. The recovered skeletal parts (vertebrae, girdles, limbs, and scarce cranial elements) show that the new taxon was just over 1 m long, with a unique anatomy among theropods. The shafts of its metatarsals II and IV are very lateromedially compressed, as are the blade-like ungual phalanges of the respective digits. This implies that the new taxon could have been functionally monodactyl, with a main central weight-bearing digit, flanked by neighbouring elements positioned very close to digit III or even held free of the ground. Such anatomical adaptation is formerly unrecorded among archosaurs, but has been previously inferred from footprints of the same stratigraphic unit that yielded the new dinosaur. A phylogenetic analysis nests the new taxon within the Noasaurinae clade, which is unresolved because of the multiple alternative positions that Noasaurus leali can acquire in the optimal trees. The exclusion of the latter form results in positioning the new dinosaur as the sister-taxon of the Argentinean Velocisaurus unicus .
Os métodos de análise morfoestrutural, baseados em índices morfométricos, constituemse em ferramentas importantes para avaliação do comportamento tectono-estrutural dos sistemas hidrográfi cos, além de serem métodos baratos e rápidos de levantamento de informações passíveis de correlação com dados de campo. Dessa forma, este artigo teve o objetivo de correlacionar dados morfométricos obtidos a partir do índice de Relação Declividade-Extensão (RDE), Fator de Assimetria de Bacias (FAB) e Fator de Simetria Topográfi ca Transversal (FSTT), com dados morfoestruturais levantados em escala de detalhe a partir de fotointerpretação geomorfológica. O índice de RDE apresentou 9 trechos com anomalias de segunda ordem e 9 com anomalias de primeira ordem; o índice FAB apresentou um valor de 44, que indica um provável basculamento para a margem direita da bacia e o FSTT apresentou um valor médio de 0,25, chegando em alguns setores a 0,89. Esses resultados apresentaram relação entre si, indicando um número maior de anomalias no setor centro-oeste da bacia, o que evidencia controle estrutural da rede de drenagem e das escarpas associadas.
This article presents the seppômen map technique through the computer application by using the free GIS software SPRING ®. The methodology was applied to the study in the case of the geomorphologhical evolution of the Parana plateaux edges contained in the Faxinal topographic sheet-state of Paraná-Brazil, the results were the digital elevation models (DEM) and topographic shapes that leads to the landform evolution of the area both by differential erosion but also by strong tectonic control.
ResumoO presente trabalho investiga a infl uência morfoestrutural e morfotectônica no arranjo das drenagens da zona de falha rio Alonzo. Para tanto, utiliza-se, principalmente, de análises de índices geomorfológicos da rede de drenagem. A metodologia aplicada fundamentou-se na integração de dados Shuttle Radar Topography Mission SRTM e nas variáveis morfométricas em ambiente de Sistema de Informação Geográfi ca SIG. A fi m de obter parâmetros de análise de anomalias geomórfi cas e controles estruturais, a identifi cação e a vetorização das feições foram pautadas em interpretação visual e pela comparação entre índices morfométricos, tais como: Fator de Simetria Topografi a Transversal, Assimetria de Bacias de Drenagens e Índices RDE (Relação Declividade Extensão). O rio Alonzo drena uma área de aproximadamente 2620 km², possui uma extensão de 171 km, desde sua nascente, no município de Ortigueira, até a sua foz, nas proximidades do município de Grandes Rios. As altitudes variam de 1000 m a 380 m, representando uma amplitude de 620 m. O rio encontra-se, em sua maior parte, ajustado às falhas e fraturas, sendo diferenciados dois trechos em ascensão (convexo) e em subsidência (côncavo). AbstractThis paper investigates the infl uence morphostructural morphotectonic and the arrangement of drainages Alonzo River fault zone. To do so, it uses mainly geomorphological analysis of indices of the drainage network. The methodology was based on data integration Shuttle Radar Topography Mission SRTM and morphometric variables in the environment of geographical information system GIS. In order to obtain parameters geomorphic analysis of anomalies and structural controls, identifi cation and vectorization of the features were guided by visual interpretation and the comparison between morphometric indices, such as Factor Symmetry Surveying Section, Asymmetric Drainage Basins and Indexes RDE (relationship Slope Extension). Alonzo The river drains an area of approximately 2620 km², has a length of 171 km from its source in the municipality of Ortigueira, to its mouth, near the city of Great Rivers. The altitude ranges from 1000 m to 380 m, representing a range of 620 m. The river is, for the most part, adjusted faults and fractures, and two different sections on the rise (convex) and subsidence (concave).
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