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Registros recuperados: 21
Primeira ... 12 ... Última
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A new angiosperm from the Crato Formation (Araripe Basin, Brazil) and comments on the Early Cretaceous Monocotyledons Anais da ABC (AABC)
LIMA,FLAVIANA J. DE; SARAIVA,ANTÔNIO A.F.; SILVA,MARIA A.P. DA; BANTIM,RENAN A.M.; SAYÃO,JULIANA M..
The Crato Formation paleoflora is one of the few equatorial floras of the Early Cretaceous. It is diverse, with many angiosperms, especially representatives of the clades magnoliids, monocotyledons and eudicots, which confirms the assumption that angiosperm diversity during the last part of the Early Cretaceous was reasonably high. The morphology of a new fossil monocot is studied and compared to all other Smilacaceae genus, especially in the venation. Cratosmilax jacksoni gen. et sp. nov. can be related to the Smilacaceae family, becoming the oldest record of the family so far. Cratosmilax jacksoni is a single mesophilic leaf with entire margins, ovate shape, with acute apex and base, four venation orders and main acrodromous veins. It is the first...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Araripe Basin; Cratosmilax jacksoni; Cretaceous; Fossil leaf; Gondwana; Monocots.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401657
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A new Cretaceous terrestrial ecosystem from Gondwana with the description of a new sauropod dinosaur Anais da ABC (AABC)
Calvo,Jorge O.; Porfiri,Juan D.; González-Riga,Bernardo J.; Kellner,Alexander W.A..
A unique site at the northern area of Patagonia (Neuquén, Argentina) reveals a terrestrial ecosystem preserved in a detail never reported before in a Late Cretaceous deposit. An extraordinary diversity and abundance of fossils was found concentrated in a 0.5 m horizon in the same quarry, including a new titanosaur sauropod, Futalognkosaurus dukei n.gen., n.sp, which is the most complete giant dinosaur known so far. Several plant leaves, showing a predominance of angiosperms over gymnosperms that likely constituted the diet of F. dukei were found too. Other dinosaurs (sauropods, theropods, ornithopods), crocodylomorphs, pterosaurs, and fishes were also discovered, allowing a partial reconstruction of this Gondwanan continental ecosystem.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinosauria; Titanosauria; Ecosystem; Taphonomy; Upper Cretaceous; Gondwana; Patagonia; Argentina.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300013
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Charcoal remains from a tonstein layer in the Faxinal Coalfield, Lower Permian, southern Paraná Basin, Brazil Anais da ABC (AABC)
Jasper,André; Uhl,Dieter; Guerra-Sommer,Margot; Abu Hamad,Abdalla M. B; Machado,Neli T. G.
Fossil charcoal has been discovered in the Faxinal Coalfield, Early Permian, Rio Bonito Formation, in the southernmost portion of the Paraná Basin, Brazil. Three types of pycnoxylic gymnosperm woods recovered from a single tonstein layer are described and confirm the occurrence of paleowildfire in this area. A decrease of the charcoal concentration from the base to the top within the tonstein layer indicates that the amount of fuel declined during the deposition probably due to the consumption of vegetation by the fire. The presence of inertinite in coals overlying and underlying the tonstein layer indicates that fire-events were not restricted to the ash fall interval. The integration of the new data presented in the current study with previously...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Charcoal; Gymnosperms; Volcanic ashes; Coal deposits; Gondwana; Late Palaeozoic.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200009
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Coricladus quiteriensis gen. et sp. nov., a new conifer in Southern-Brazil Gondwana (Lower Permian, Paraná Basin) Anais da ABC (AABC)
Jasper,André; Ricardi-Branco,Fresia; Guerra-Sommer,Margot.
A new taxon of conifers (Coricladus quiteriensis) is described based on megafloristic remains from the roofshale level at the Quitéria Outcrop (Rio Bonito Formation - Lower Permian - Southern Paraná Basin - Rio Grande do Sul - Brazil). This megafloristic community is included in the Botrychiopsis Zone - Botrychiopsis valida Sub-Zone (Kungurian/Roadian). The assemblage, preserved as impressions, do not present remains of epidermic characters, and is composed mainly of isolated vegetative branches with spirally disposed acicular leaves, presenting a conspicuous central vein and also isolated fertile branches with sparse and irregular leaves and terminal cones. Leafless principal branches, organically connected with sterile and fertile branches, are rare....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coricladus quiteriensis; Paleobotany; Taxonomy; Coniferopsida; Gondwana; Lower Permian.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100012
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Early Devonian (Late Emsian) shark fin remains (Chondrichthyes) from the Paraná Basin, southern Brazil Anais da ABC (AABC)
RICHTER,MARTHA; BOSETTI,ELVIO P.; HORODYSKI,RODRIGO S..
ABSTRACT We report on the pioneering discovery of Devonian fish remains in the Paraná Basin, which represents the southernmost record of fishes from that period in mainland South America. The material comes from an outcrop at the lower portion of the São Domingos Formation, within Sequence C of the Paraná-Apucarana sub-basin in Tibagi, State of Paraná. Marine invertebrates are abundant in the same strata. The dark colored fish remains were collected in situ and represent natural moulds of partially articulated shark fin rays (radials). No elements such as teeth or prismatic cartilage have been preserved with the fins rays. This can be attributed to the dissolution of calcium-phosphatic minerals at the early stages of fossilization due to diagenetic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chondrichthyes; Devonian; Gondwana; Paraná Basin; Southern Brazil; Taphonomy..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100103
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Early Silurian (Rhuddanian) brachiopods from the Argentine Precordillera and their biogeographic affinities Ameghiniana
Benedetto,Juan L.; Cocks,L. Robin M..
A brachiopod fauna dominated by Hindella crassa (J. de C. Sowerby), and also including an indeterminate pseudolinguloid, Leangella (Leangella) america sp. nov., Eoplectodonta (Eoplectodonta) duplicata (J. de C. Sowerby), Fardenia sp., Glyptorthis vidari (Baarli)., Dolerorthis plicata (J. de C. Sowerby), an indeterminate giraldiellid, Dalmanella sp., and Stegerhynchus pusillum (J. de C. Sowerby), is described from the La Chilca Formation exposed at Mogotes Azules, San Juan Province, Argentina. The age of the fauna is Early Silurian (Llandovery: Rhuddanian) and it is compared with other Rhuddanian brachiopod faunas both from Gondwana and elsewhere. The brachiopod faunas of Gondwana, despite their relatively low diversity, had much in common with those from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Silurian; Rhuddanian; Brachiopods; Precordillera; Argentina; Gondwana.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000200003
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Evolution Géodynamique du domaine Ouest-offshore de la Nouvelle-Calédonie et de ses extensions vers la Nouvelle-Zélande ArchiMer
Collot, Julien.
The southwest Pacific results from the fragmentation of Gondwanaland since the Cretaceous time. The purpose of the current PhD work is to deepen our understanding of the history of the New Caledonia and Fairway basins, located west of New Caledonia, in order to better constrain the geodynamical evolution of the SW Pacific from Cretaceous to Oligocene. The analysis of new geophysical data has led to distinguish 3 main phases of this fragmentation: 1 Mid Cretaceous formation of the Fairway-Aotea Basin in a continental intra-arc position. The formation of this basin reflects the initial stage of continental fragmentation of the Eastern Gondwana margin. The causes of this fragmentation are to be searched for in a major change of the dynamics of the...
Tipo: Text Palavras-chave: Subduction; Obduction; Norfolk; Lord Howe; Gondwana; Taranaki; New Caledonia; Fairway; Aotea; Magnetic; Gravity; Seismic; Subduction; Obduction; Norfolk; Lord Howe; Gondwana; Taranaki; Nouvelle Calédonie; Fairway; Aotea; Magnétisme; Gravimétrie; Sismique.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/these-6520.pdf
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Historical biogeographic analysis of the family Fanniidae (Díptera: Calyptratae), with special reference to the austral species of the genus Fannia (Diptera: Fanniidae) using dispersal-vicariance analysis RChHN
DOMÍNGUEZ,M. CECILIA; ROIG-JUÑENT,SERGIO A.
The purpose of this study was to achieve a hypothesis explaining the biogeographical history of the family Fanniidae, especially that of the species from Patagonia, the Neotropics, Australia, and New Zealand. We used "dispersal-vicariance analysis" (DIVA), an event-based parsimony method, to analyze the most parsimonious phylogenetic hypothesis for the family, obtained by Domínguez & Roig-Juñent (2008). The analysis resulted in 32800 alternative equally optimal reconstructions that indicate that the ancestor of the Fanniidae was widely distributed across different regions of the world, which along with the subsequent separation of two clades that correspond to the Laurasic and Gondwanan Landmasses allow the proposal of an older age than in previous...
Tipo: Journal article Palavras-chave: Age of Fanniidae; Dispersal; DIVA; Gondwana; Vicariance.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100005
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Monazite ID-TIMS U-Pb geochronology in the LAGIR laboratory, Rio de Janeiro State University: protocols and first applications to the assembly of Gondwana supercontinent in SE-Brazil Anais da ABC (AABC)
C.A. NETO,CARLA; VALERIANO,CLAUDIO M.; PASSARELLI,CLAUDIA R.; HEILBRON,MONICA; LOBATO,MARCELA.
The chemical and spectrometric procedures of the U-Pb geochronology method on monazites, recently installed in the LAGIR laboratory, are described in detail. In addition, preliminary results on monazite samples from the Brasília and Ribeira belts are reported and discussed in the context of the regional geology. Several experiments for calibration of ion exchange chromatographic columns with the AG-1x8 resin, were performed with HCl, using dissolved natural monazite samples. The Pb blanks of reagents are ∼0.5 pg/g in acids and ∼1 pg/g in H2O. The total Pb blanks in chemical procedures were below 22 pg. Preliminary results are presented from three case studies related to Brasiliano orogenic belts of SE-Brazil, which correlate very well with previous age...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gondwana; Brasiliano; Isotope dilution mass spectrometry; U-Pb; Monazite.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100171
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New starting point for the Indian Ocean: Second phase of breakup for Gondwana ArchiMer
Thompson, Joseph Offei; Moulin, Maryline; Aslanian, Daniel; De Clarens, P.; Guillocheau, F..
The amalgamation of Gondwana and its subsequent fragmentation has been a subject of several studies over the past five decades, yet the very important question of the initial geometry of the supercontinent remains enigmatic. Current reconstruction models of the Indian Ocean are characterized by large gaps, overlaps and misfits of major structural and Cratonic bodies in their fit, and positions of tectonic blocks that are inconsistent with field observations, a phenomenon sustained by inadequate data, long standing debates and a lack of consensus on the nature of major structures and basins in the ocean. Past attempts to reconstruct the initial fit of the ocean has led to varied and complex models, with their own logic and different geographical limits,...
Tipo: Text Palavras-chave: Gondwana; Plate tectonics; Indian Ocean; PanAfrican structures; Amalgamation; Kinematic evolution.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00481/59298/61992.pdf
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Nuevos trilobites del Ovetiense inferior (Cámbrico Inferior bajo) de Sierra Morena (España) Ameghiniana
Liñán,Eladio; Gozalo,Rodolfo; Dies Álvarez,María Eugenia; Gámez Vintaned,José Antonio; Zamora,Samuel.
Se describen trilobites de dos localidades del Ovetiense inferior (Cámbrico Inferior bajo) de Sierra Morena (sur de España). En la localidad más occidental (Alconera), se definen Serrania palaciosi nov. sp. y Serrania? gordaensis nov. sp. En la localidad más oriental (Sierra de Córdoba) se estudia nuevo material de Serrania verae Liñán Guijarro, 1978. El estudio ontogénico realizado en S. verae sugiere que esta especie procede de S. palaciosi. El nuevo material permite incluir el género Serrania en la nueva subfamilia Serrinae de la familia Bigotinidae, subfamilia a la que pertenecerían los géneros Hupetina y Sdzuyia, que también presentan una corta espina lateral en la librígena. La posición estratigráfica de los taxones estudiados y sus asociaciones...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Trilobita; Bigotinidae; Serrinae; Ovetiense inferior; Sierra Morena; España; Gondwana.
Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000100008
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Paleobiogeographic evolution and distribution of Carcharodontosauridae (Dinosauria, Theropoda) during the middle Cretaceous of North Africa Pap. Avulsos de Zool. (São Paulo)
Candeiro,Carlos Roberto dos Anjos; Brusatte,Stephen Louis; Vidal,Luciano; Pereira,Paulo Victor Luiz Gomes da Costa.
Abstract Over the last few decades, the systematics and evolution of carcharodontosaurids, a group of large predatory dinosaurs, from North Africa have been better understood mainly due the discovery of new species. We review this record here and discuss its importance for understanding the evolution and ecology of these dinosaurs. North Africa has one of the best records of carcharodontosaurid species. These species show dietary specializations and paleogeographic distributions similar to other top predatory theropods such as Abelisauridae and Spinosauridae. However, carcharodontosaurids have a wider distribution than other large theropods. The middle Cretaceous of North Africa was characterized by the niche overlap between large predators. This evidence...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carcharodontosauridae; Gondwana; Middle Cretaceous; North Africa; Overlap.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492018000100228
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Plate motions, Gondwana Dinosaurs, Noah's Arks, Beached Viking Funeral Ships, Ghost Ships, and Landspans Anais da ABC (AABC)
Jacobs,Louis L.; Strganac,Christopher; Scotese,Christopher.
Gondwana landmasses have served as large-scale biogeographic Noah's Arks and Beached Viking Funeral Ships, as defined by McKenna. The latitudinal trajectories of selected Gondwana dinosaur localities were traced through time in order to evaluate their movement through climate zones relative to those in which they originally formed. The dispersal of fauna during the breakup of Gondwana may have been facilitated by the presence of offshelf islands forming landspans (sensu Iturralde-Vinent and MacPhee) in the Equatorial Atlantic Gateway and elsewhere.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biogeography; Dinosaur; Gondwana; Latitude.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100002
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Record of the genus Lycopodites in the Lower Permian of Paraná Basin, Brazil Anais da ABC (AABC)
Salvi,Juliana; Jasper,André; Ricardi-Branco,Fresia; Bernardes-de-Oliveira,Mary Elizabeth C.; Guerra-Sommer,Margot.
The genus Lycopodites, which encompasses the herbaceous forms of the lycopsids, presents broad time and spacial distribution during the Paleozoic in the Northern Hemisphere, with its initial records dating from the European Devonian. As to Gondwanan Paleozoic, to this moment, only Lycopodites amazonica Dolianiti had been reported for the Amazonian Middle Devonian (Curuá Group). Thus, the specimens reported in this study such as Lycopodites sp., coming from sedimentary rocks of the Itararé Subgroup, São Paulo State, and Lycopodites riograndensis sp. nov., collected in Rio Bonito Formation, Rio Grande do Sul, represent the oldest fertile forms recorded for Gondwana and the first ones to be described for the Paraná Basin. Its presence in layers, deposited...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lycopodites sp.; Lycopodites riograndensis sp. nov.; Gondwana; Lower Permian; Paraná Basin.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300015
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Réplica al trabajo de Axsmith et al. (2007) publicado en Ameghiniana 44: 223-230: The 'New Approach to Corystospermales' and the Antarctic Fossil Record: A Critique Ameghiniana
Artabe,Analía E.; Brea,Mariana.
En esta contribución se da respuesta a la crítica de Axsmith, Taylor y Taylor publicada en Ameghiniana 44: 223-230. En primer lugar, se insiste en no admitir como "evidencia inequívoca" de conexión orgánica a hojas de Dicroidium odontopteroides con ramas con braquiblastos reportadas por Axsmith et al. (2000) en la localidad de Alfie, Antártida. Asimismo, el análisis del material de la Antártida realizado en el presente trabajo, permite interpretar que los órganos cupulados de Umkomasia uniramia deberían asignarse a otro morfogénero probablemente peltaspermoide. Remarcamos que en la contribución de Artabe y Brea publicada en Alcheringa se analizaron todos los caracteres que presentan los leños de corystospermas de la Argentina y no se ignoraron los...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Corystospermales; Gondwana; Triásico; Reconstrucción de Dicroidium.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000400009
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Systematic status of the mid-Tertiary neobatrachian frog Calyptocephalella canqueli from Patagonia (Argentina), with comments on the evolution of the genus Ameghiniana
Muzzoppapa,Paula; Báez,Ana M.
The neobatrachian genus Calyptocephalella Strand, closely allied to the Australian myobatrachoids in recent molecular analyses, is now restricted to lowland water bodies of the Austral forests of Chile but had a broader distribution according to paleontological data. New, well-preserved material from the early Miocene locality Estancia Baibián, Chubut Province, Argentina, is described herein and assigned to Calyptocephalella canqueli Schaeffer, a species erected on the basis of Deseadan (late Oligocene) specimens, but subsequently synonymized with the only living species, Calyptocephalella gayi Duméril and Bibron. Detailed comparisons suggest that Calyptocephalella canqueli is a valid taxon representing frogs that inhabited Patagonia east of the Andes in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Australobatrachia; Myobatrachoidea; Gondwana; Sarmiento Formation; Deseadan; Colhuehuapian; Austral forests.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000100008
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The Botrychiopsis genus and its biostratigraphic implications in Southern Paraná Basin Anais da ABC (AABC)
Jasper,André; Guerra-Sommer,Margot; Cazzulo-Klepzig,Miriam; Menegat,Rualdo.
Botrychiopsis has been considered an important floristic element of Westphalian/Artinskian associations of the Paraná Basin. The occurrence of Botrychiopsis in roof-shales of the Rio Bonito Formation in Southern Paraná Basin (Quitéria area), supported by the identification of Botrychiopsis valida, enlarges the genus biochron. Consequently, the stratigraphic hierarchy for Botrychiopsis plantiana and Botrychiopsis valida was defined for the Paraná Basin. Although it is climatically controlled and related to a deglaciation icehouse stage, stratigraphic distribution of the genus presents a substantial climate tolerance, from cold/cool to warm/temperate conditions. A new phytostratigraphic zonation is proposed for the southern portion of the basin that includes...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Botrychiopsis; Biostratigraphy; Paraná Basin; Permian; Palaeoclimatology; Gondwana.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400009
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The largest flying reptile from Gondwana: a new specimen of Tropeognathus cf. T. mesembrinusWellnhofer, 1987 (Pterodactyloidea, Anhangueridae) and other large pterosaurs from the Romualdo Formation, Lower Cretaceous, Brazil Anais da ABC (AABC)
KELLNER,ALEXANDER W. A.; CAMPOS,DIOGENES A.; SAYÃO,JULIANA M.; SARAIVA,ANTÔNIO A.F.; RODRIGUES,TAISSA; OLIVEIRA,GUSTAVO; CRUZ,LILIAN A.; COSTA,FABIANA R.; SILVA,HELDER P.; FERREIRA,JENNYFER S..
A very large pterosaur (MN 6594-V) from the Romualdo Formation (Aptian/Albian), Santana Group, Araripe Basin, is described. The specimen is referred to Tropeognathus cf. T. mesembrinus mainly due to the presence of a low and blunt frontoparietal crest, the comparatively low number of teeth and the inclined dorsal part of the occipital region. Two distinct wingspan measurements for pterosaurs are introduced: the maximized wingspan (maxws), which essentially consists of doubling the addition of all wing elements and the length of the scapula or the coracoid (the smaller of the two), and the normal wingspan (nws), which applies a reducing factor (rfc) to the maximized wingspan to account for the natural flexures of the wing. The rfc suggested for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Anhangueridae; Tropeognathus; Cretaceous; Gondwana.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100113
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The last dinosaurs of Brazil: The Bauru Group and its implications for the end-Cretaceous mass extinction Anais da ABC (AABC)
BRUSATTE,STEPHEN L.; CANDEIRO,CARLOS R.A.; SIMBRAS,FELIPE M..
ABSTRACT The non-avian dinosaurs died out at the end of the Cretaceous, ~66 million years ago, after an asteroid impact. The prevailing hypothesis is that the effects of the impact suddenly killed the dinosaurs, but the poor fossil record of latest Cretaceous (Campanian-Maastrichtian) dinosaurs from outside Laurasia (and even more particularly, North America) makes it difficult to test specific extinction scenarios. Over the past few decades, a wealth of new discoveries from the Bauru Group of Brazil has revealed a unique window into the evolution of terminal Cretaceous dinosaurs from the southern continents. We review this record and demonstrate that there was a diversity of dinosaurs, of varying body sizes, diets, and ecological roles, that survived to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazil; Cretaceous; Dinosaur; Gondwana; K-Pg boundary; Mass extinction.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401465
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The "New Approach to Corystospermales" and the Antarctic Fossil Record: A Critique Ameghiniana
Axsmith,Brian J.; Taylor,Edith L.; Taylor,Thomas N..
Much is now known about the Mesozoic pteridosperm order Corystospermales based on over seventy years of research. However, several concepts of corystosperm evolution have been proposed that avoid well-established phylogenetic methodology and arbitrarily discount evidence of the group from Antarctica. Here, we focus on the "New approach to Corystospermales" published by Artabe and Brea, which establishes a phylogeny for corystosperms based mainly on a restricted concept of anomalous wood anatomy in this group, and assumed relationships with cycads and medullosan pteridosperms. These authors also question evidence regarding attached corystospermalean organs from Antarctica. Based on a reconsideration of the Antarctic record, we reaffirm the evidence for a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antarctica; Corystospermales; Dicroidium; Gondwana; Phylogeny; South America; Triassic; Seed ferns.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100017
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