Baiano, Mattia A.

Bellardini, Flavio

Heredia, Arturo M.

Pino, Diego

Windholz, Guillermo J.

German

Martin-Luther-Universität Halle-Wittenberg: Elektronische Zeitschriften

36  3rd InternatIonal ConferenCe of ContInental IChnology, abstraCt Volume & fIeld trIp guIdePreliminary studies of a new dinosaur track locality from the Cande-leros Formation (Cenomanian, Upper Cretaceous), Neuquén Basin, Argentina arturo M. heredia1*, Mattia a. baiano2, 3, diego pino2, guillerMo J. windholz2, 3, Flavio bellardini3, 41 CONICET - Universidad de Buenos Aires. Instituto de Estudios Andinos Don Pablo Groeber (IDEAN). Buenos Aires, Argentina2 CONICET - Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología (IIPG). Gene-ral Roca, Río Negro, Argentina3 CONICET - Museo Carmen Funes, Av. Córdoba 55, Plaza Huincul, Neuquén, Argentina4 Ministerio de las Culturas, Dirección Provincial de Patrimonio Cultural, Neuquén, Argentina*presenting author, heredia@gl.fcen.uba.arAbstract:A new Upper Cretaceous (Cenomanian) dinosaur track locality “El Chocón Medio” from northwestern Patagonia, Argentina, is reported here. More than 30 true tracks (concave epireliefs) were recognized in fine-grained sandstone beds, interpreted as floodplain deposits. The only distinct trackway consist of six deep and medium-sized tridactyl tracks poorly preserved with distinct metatarsal impressions (about 50 cm long and 20 cm wide). This trackway does not reflect changes in footprint features such as track length, depth, pace and height of displacement rims, suggesting that the consistency of the substrate was homogenous along the complete distance. About 20 m from this trackway, several deeper and large tridactyl tracks (30 to 40 cm in length) with very pronounced rims have been identified. They are positioned close to each other and show different orientations, accordingly were considered as isolated tracks. They are poorly preserved and lack anatomical features, making it difficult to determine a theropod or ornithopod affinity. Finally, in the underlying bed (10 cm be-low) several subcircular (70 cm in diameter) and crescent-shaped (50 cm in width) natural cast tracks (pes-manus) of sauropods were documented. At least three sauropod pes from the same side (left or right) where arranged in an incomplete trackway, so the type of gauge could not be determined. Preliminarily, considering the similar morphology and heteropody, these tracks can be assigned to cf. Sauropodichnus giganteus Calvo, 1991, from the same unit and tracksite proximity. The present track assemblage shows that this site was repeatedly visited by different groups of dinosaurs.Keywords: tridactyl footprints, metatarsal impressions, sauropod tracks, Cenomanian, Patagonia

Preliminary studies of a new dinosaur track locality from the Candeleros Formation (Cenomanian, Upper Cretaceous), Neuquén Basin, Argentina

A new Upper Cretaceous (Cenomanian) dinosaur track locality ¨El Chocón Medio¨ from northwesternPatagonia, Argentina, is reported here. More than 30 true tracks (concave epireliefs) were recognizedin fine-grained sandstone beds, interpreted as floodplain deposits. The only distinct trackway consistof six deep and medium-sized tridactyl tracks poorly preserved with distinct metatarsal impressions(about 50 cm long and 20 cm wide). This trackway does not reflect changes in footprint featuressuch as track length, depth, pace and height of displacement rims, suggesting that the consistencyof the substrate was homogenous along the complete distance. About 20 m from this trackway,several deeper and large tridactyl tracks (30 to 40 cm in length) with very pronounced rims havebeen identified. They are positioned close to each other and show different orientations, accordinglywere considered as isolated tracks. They are poorly preserved and lack anatomical features, makingit difficult to determine a theropod or ornithopod affinity. Finally, in the underlying bed (10 cm be-low) several subcircular (70 cm in diameter) and crescent-shaped (50 cm in width) natural cast tracks(pes-manus) of sauropods were documented. At least three sauropod pes from the same side (leftor right) where arranged in an incomplete trackway, so the type of gauge could not be determined.Preliminarily, considering the similar morphology and heteropody, these tracks can be assigned tocf. Sauropodichnus giganteus Calvo, 1991, from the same unit and tracksite proximity. The presenttrack assemblage shows that this site was repeatedly visited by different groups of dinosaurs.Fil: Heredia, Arturo Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Baiano, Mattia Antonio. Provincia del Neuquén. Municipalidad de Plaza Huincul. Museo "Carmen Funes"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Pino, Diego Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; ArgentinaFil: Windholz, Guillermo Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; ArgentinaFil: Bellardini, Flavio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina3rd International Conference of Continental IchnologyHalleAlemaniaCentral Natural Science CollectionsUniversität Halle-Wittenber

Preliminary studies of a new dinosaur track locality from the Candeleros Formation (Cenomanian, Upper Cretaceous), Neuquén Basin, Argentina

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