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Artículo

Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina

Título: Hallazgos Paleontológicos en la Formación Chorrillo (Campaniano-Maastrichtiano, Cretácico Superior), Provincia de Santa Cruz, Patagonia, Argentina
Novas, Fernando EmilioIcon ; Agnolin, FedericoIcon ; Rozadilla, SebastianIcon ; Aranciaga Rolando, Alexis MauroIcon ; Brissón Egli, FedericoIcon ; Motta, Matias JavierIcon ; Cerroni, Mauricio AndrésIcon ; Ezcurra, Martin DanielIcon ; Martinelli, Agustín GuillermoIcon ; D'angelo, Julia SoledadIcon ; Alvarez Herrera, Gerardo PaulinoIcon ; Gentil, Adriel RobertoIcon ; Bogan, Sergio; Chimento, Nicolás RobertoIcon ; García Marsa, Jordi AlexisIcon ; Lo Coco, Gastón ErnestoIcon ; Miquel, Sergio EduardoIcon ; Brito, Fátima FernandaIcon ; Vera, Ezequiel IgnacioIcon ; Perez Loinaze, Valeria SusanaIcon ; Fernández, MarielaIcon ; Salgado, LeonardoIcon
Fecha de publicación: 12/2019
Editorial: Museo Argentino de Ciencias Naturales Bernardino Rivadavia
Revista: Revista del Museo Argentino de Ciencias Naturales
ISSN: 1514-5158
e-ISSN: 1853-0400
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Paleontología

Resumen

The first fossil remains of vertebrates, invertebrates, plants and palynomorphs of the Chorrillo Formation (Austral Basin), about 30km to the SW of the town of El Calafate (Province of Santa Cruz), are described. Fossils include the elasmarian (basal Iguanodontia) Isasicursor santacrucensis gen. et sp. nov., the large titanosaur Nullotitan glaciaris gen. et sp. nov., both large and small Megaraptoridae indet., and fragments of sauropod and theropod eggshells. The list of vertebrates is also composed by the Neognathae Kookne yeutensis gen. et sp. nov., two isolated caudal vertebrae of Mammalia indet., and isolated teeth of a large mosasaur. Remains of fishes, anurans, turtles, and snakes are represented by fragmentary material of low taxonomical value, with the exception of remains belonging to Calyptocephalellidae. On the other hand, a remarkable diversity of terrestrial and freshwater gastropods has been documented, as well as fossil woods and palinological assemblages. The Chorrillo Formation continues south, in the Las Chinas River valley, southern Chile, where it is called Dorotea Formation. Both units share in their lower two thirds abundant materials of titanosaurs, whose remains cease to appear in the upper third, registering only elasmarians (Chorrillo Formation) and hadrosaurs (Dorotea Formation). Above both units there are levels with remains of invertebrates and marine reptiles. It is striking that the dinosaurs of the lower two thirds of the Chorrillo and Dorotea formations are represented by large basal titanosaurs and Megaraptoridae coelurosaurs, being the Saltasaurinae and Aeolosaurinae sauropods and Abelisauridae theropods totally absent. In contrast, these taxa are dominant components in sedimentary units of central and northern Patagonia (e.g., Allen, Los Alamitos, La Colonia formations). Such differences could reflect, in part, a greater antiquity (i.e., late Campanian-early Maastrichtian) for the Chorrillo fossils, or, more probably, different environmental conditions. Thus, knowledge of the biota of the southern tip of Patagonia is expanded, particularly those temporarily close to the K-Pg boundary.
Palabras clave: CHORRILLO FORMATION , FOSSILS , LATE CRETACEOUS , SOUTHERN PATAGONIA
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution 2.5 Unported (CC BY 2.5)
Identificadores
URI: http://hdl.handle.net/11336/122229
URL: http://revista.macn.gob.ar/ojs/index.php/RevMus/article/view/655
DOI: http://dx.doi.org/ 10.22179/REVMACN.21.655
Colecciones
Articulos(IIPG)
Articulos de INSTITUTO DE INVESTIGACION EN PALEOBIOLOGIA Y GEOLOGIA
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos(MACNBR)
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Citación
Novas, Fernando Emilio; Agnolin, Federico; Rozadilla, Sebastian; Aranciaga Rolando, Alexis Mauro; Brissón Egli, Federico; et al.; Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina; Museo Argentino de Ciencias Naturales Bernardino Rivadavia; Revista del Museo Argentino de Ciencias Naturales; 21; 2; 12-2019; 217-293
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