Report on the Upper Permian and Lower Cretaceous fossiliferous localities vertebrates-beaaring in the central-north of Tocantins State, Brazil

Since the second half of the last century, fossils of vertebrates have been encountered in the Balsas and Mearim group in the center north area of the State of Tocantins, Parnaiba Basin. The Pedra de Fogo and Corda formations compose these unities respectively and their respective ages are dated as Upper Permian and Lower Cretaceous in age. Upper Permian and Lower Cretaceous vertebrates were recovered in the municipalities of Filadélfia (1), Barra do Ouro, Filadélfia (2), Guaraí and Itaguatins. This fauna consists essentially of fragments (scales, spines, teeth, etc.) of paleonisciforms, elasmobranches, coelacantids and one sauropod dinosaur ichnofossil. All, with the exception of the sauropod and the municipality of Itaguatins, are outercroppings of the Trisidela Member (Pedra de Fogo Formation).NOTA SOBRE AS LOCALIDADES FOSSILÍFERAS PORTADORAS DE VERTEBRADOS DO PERMIANO SUPERIOR E CRETÁCEO INFERIOR DA REGIÃO CENTRO-NORTE DO ESTADO DO TOCANTINS, BRASIL. Desde a segunda metade do século passado, fósseis de vertebrados têm sido encontradas em rochas dos grupos Balsas e Mearim, porção centro norte do estado do Tocantins, Bacia do Parnaíba. As formações Pedra de Fogo e Corda compõem os referidos grupos, respectivamente, sendo suas respectivas idades datadas no Permiano Superior e Cretáceo Inferior. As ocorrências de vertebrados do Permiano Superior e Cretáceo Inferior são encontradas nos municípios de Filadélfia 1, Barra do Ouro, Filadélfia 2, Guaraí e Itaguatins. Esta fauna consiste essencialmente de fragmentos (escamas, espinhos, dentes e etc.) de paleonisciformes, elasmobranquios, celacantídeos e um icnofóssil Sauropoda. Todos, com exceção do dinossauro sauropoda e o município de Itaguatins, são aflorantes na Formação Pedra de Fogo, Membro Trisidela

LOS VERTEBRADOS FÓSILES DEL PALEOZOICO Y MESOZOICO DEL ESTADO DE TOCANTINS (BRASIL): PRELIMINAR SÍNTESIS

O registro dos vertebrados fósseis deportados no estado do Tocantins (Norte do Brasil), junto ao conhecimento geológico e paleontológico, é escasso em comparado com outros estados brasileiros. Recentemente, as faunas de vertebrados estão começando a serem descritas e analisadas, podendo aumentar a lista de taxa aqui apresentados. Esta fauna provém de cinco localidades fossilíferas, e consiste essencialmente em restos fragmentários (escamas, espinhos, dientes e etc) de paleonisciformes, elasmobranquiomorfos, celatantídeos e de um icnofóssil de Sauropoda. Os níveis sedimentares fossilíferos das rochas pertencem a Formação Pedra de Fogo (Permiano Superior) e Formação Corda (Cretácio Inferior) da Bacia do Parnaíba

Amazonian lower cretaceous north tocantins state (Brazil) dinosaur track site: conservation significance

On the left bank of the Tocantins River, near São Domingos, State of Tocantins, northern Brazil, there are at least six vertebrate trackways from the Barremian Corda Formation (Parnaíba Basin) first reported by Leonardi (BuenosAires 1:215–222, 1980) and assigned to iguanodontid dinosaurs. Later, these trackways were reassigned as belonging to sauropods. Until 2011, this locality was subject to river floods during seasonal rain cycles. Since then, the amount of water on the flatstones was substantially modified due the implantation of the “Usina Hidroeletrica de Estreito”, which has a dam 160 km upstream from the trackways locality. Recent fieldwork in the area has revealed that only a part of four original trackways is still preserved. The specimens, with poor to moderate preservation, are represented by large semicircular pes imprints lacking digital impressions mostly overlapping the hand print, which supports a sauropodian origin. Here, the authors consider and suggest geotourism as an important tool to protect and preserve the São Domingos’ footprints.Fil: Tavares, Lanuze Fabielly S.. Universidade Federal do Tocantins; BrasilFil: de Valais, Silvina. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Modesto Alves, Yuri. Universidade Federal do Estado do Rio de Janeiro; BrasilFil: Candeiro, Carlos Roberto A.. Universidade Federal de Uberlândia; Brasi

Current situation of the ichnological locality of São Domingos from the Corda Formation (Lower Cretaceous), northern Tocantins state, Brazil

In the 80's, Leonardi treated the presence of a vertebrate ichnological locality from the Barremian Corda Formation, Parnaíba Basin, on the left bank of the Tocantins river, near of the São Domingos town, Itaguatins, State of Tocantins, Brazil. Originally, the record was composed of at least seven in situ trackways, accounting for fifty six tracks. Since 2011, the Hydroelectric Power Plant do Estreito has begun to work, causing the development of a water reservoir 160km upstream to the ichnological site, causing periodic and highly energetic floods over the footprints-bearing level and altering it. The imprints are poorly to moderate preserved, but it is possible to distinguish the general morphology and the spatial arrangement of the footprints. The specimens are represented by pes imprints, mostly circular to subcircular, with no digital and claw impressions. No distinguishable manus imprints are present. The trackways are relative narrow with respect to the size of the tracks, so they are considered into the Parabrontopodus-like category. The São Domingos tracks have been originally assigned to iguanodontid dinosaurs, and posteriorly related to a sauropodian origin. This idea is herein accepted, particularly to a basal sauropod, basal macronarians, or diplodocoids. Up to date, the tracks from the São Domingos locality are the only vertebrate fossil record from the Corda Formation, meaning an important contribution to the Cretaceous ichnofauna from South America.Fil: de Valais, Silvina. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Candeiro, Carlos Roberto Dos Anjos. Universidade Federal do Tocantins; Brasil. Universidade Federal de Uberlandia; BrasilFil: Tavares, Lanuze Fabielly S.. Universidade Federal de Uberlandia; BrasilFil: Alves, Yuri Modesto. Universidade do Estado do Rio de Janeiro; BrasilFil: Cruvinel, Ciro Alexandre T.. Universidade Federal do Tocantins; Brasi