Atualização da informação geológica e estratigráfica das jazidas de dinossáurios de La Rioja. Paleodiversidade do Cretácico Inferior do Grupo Enciso em Peña Cárcena (Igea, Espanha)

ABSTRACT: The discovery of new vertebrate fossil sites with skeletal remains in the Enciso Group of Igea (La Rioja) is showing the relevance of the area to study the palaeobiodiversity of Early Cretaceous vertebrate faunas from the Iberian Peninsula. At Peña Cárcena hill two sedimentary environments have been inferred: a mixed siliciclastic-carbonate lacustrine environment that is dominant at the outcrops, overlaid by a splay delta in an avulsion-belt. The vertebrate remains are especially abundant in the mixed siliciclastic-carbonate lacustrine deposits with two partially articulated skeletons (a theropod and a large-sized dinosaur), teeth and a fragment of a left maxilla of baryonychines, a pterosaur tooth that differs from those of Prejanopterus, a Goniopholis tooth, chelonian shell fragments that might belong to Camerochelys, a fairly complete lepisosteiform, teeth and dorsal fin spines of hybodontiforms. At the delta deposits, vertebrate fossils are rather scarce, with a single lepisosteiform skeleton and indeterminate bone fragments.RESUMO: A descoberta de novas jazidas com restos osteológicos de vertebrados no Grupo Enciso em Igea (La Rioja) comprova a importância da região para o estudo da paleobiodiversidade das faunas de vertebrados do Cretácico Inferior da Península Ibérica. Na colina de Peña-Cárcena, tem-se inferido dois ambientes sedimentares: o predominante nos afloramentos corresponde a um ambiente lacustre, siliciclástico-carbonatado misto, que se encontra sobreposto por depósitos de transbordo deltaico em cinturão abandonado. Restos de vertebrados são abundantes nos depósitos lacustres, incluindo dois esqueletos parciais articulados (de um terópode e de outro dinossáurio de grande porte), dentes e um fragmento de maxila esquerda de barionicinos, um dente de pterossáurio distinto de Prejanopterus, um dente de Goniopholis, fragmentos da carapaça de quelónios que poderão pertencer a Camerochelys, um lepisosteiforme praticamente completo, dentes e espinhos de barbatanas de hybodontiformes. Fósseis de vertebrados são escassos nos depósitos deltaicos, com apenas um esqueleto de lepisosteiforme e fragmentos indeterminados.info:eu-repo/semantics/publishedVersio

La asociación faunística de Barranco del Hocino 1, un nuevo yacimiento de vertebrados del Barremiense (Cretácico Inferior) de Teruel.

El yacimiento de “Barranco del Hocino 1” es nueva localidad de vertebrados fósiles hallada en la Formación Blesa (Barremiense) cerca de la población de Estercuel (Teruel, España). Una campaña de trabajo de campo ha permitido la recuperación de un centenar de restos óseos y dientes correspondientes a dinosaurios ornitópodos, tireóforos y terópodos, junto a restos de crocodilomorfos, peces óseos, quelonios, además de coprolitos y cáscaras de huevo. Este nuevo yacimiento representa una contribución significativa sobre la diversidad de vertebrados en el Barremiense inferior de Teruel y la formación de yacimientos de vertebrados en la Subcuenca de Oliete. Here we present “Barranco del Hocino 1”, a new vertebrate locality from the Blesa Formation (Barremian), near the town of Estercuel (Teruel, Spain). One campaign of fieldwork has enabled us to recover one hundred of osteological remains. They include ornithopod, thyreophoran and theropod dinosaur postcranial remains and isolated teeth, as well as those of crocodylomorphs, chelonians and osteichthyes. Coprolites and eggshell fragments are also present. This new vertebrate fossil site represents a significate contribution on the vertebrate diversity in the lower Barremian of Teruel and the formation of vertebrate sites in Oliete Sub-Basin

A new contribution to our knowledge of the large-bodied theropods from the Barremian of the Iberian Peninsula: the “Barranco del Hocino” site (Spain)

Introducción Barranco del Hocino-1 es un nuevo yacimiento localizado en el entorno de Estercuel, provincial de Teruel (España). Geológicamente se sitúa en la Formación Blesa (subcuenca de Oliete) de edad Barremiense. El yacimiento presenta una asociación diversa de vertebrados similar a otros de la misma formación. Materiales y métodos Se han encontrado seis dientes aislados de dinosaurios terópodos. Mediante el estudio de los caracteres cualitativos y cuantitativos junto con el uso de análisis estadístico multivariante (DFA) y análisis cladístico se han podido identifcar cuatro morfotipos diferentes. Resultados Los morfotipos identifcados pertenecen a diferentes grupos de tetanuros basales. Uno de los morfotipos está relacionado con Spinosauridae, mientras que el resto presentan afnidades con tetanuros no espinosáuridos, posiblemente relacionados con el clado Carcharodontosauria. Conclusiones Los resultados son coherentes con el registro de terópodos conocido tanto en la península ibérica y Europa Occidental durante el Cretácico Inferior. El hallazgo supone una nueva contribución al conocimiento de la paleobiodiversidad y distribución de grandes terópodos del Barremiense de la península ibérica.Introduction: Barranco del Hocino-1 is a new fossil site located near Estercuel, Teruel province, Spain. The fossil site is located geologically within the Oliete sub-basin, in the Blesa Formation (Barremian in age). Barranco del Hocino-1 shows a diverse assemblage of tetrapod vertebrates similar to other sites in the Blesa Formation. Materials and methods: Six isolated teeth belonging to Theropoda have been found. A study of their qualitative and quantitative characters, along with statistical (DFA) and cladistic analyses, enable us to identify four different dental morphotypes. Results: These morphotypes belong to separate tetanuran theropod taxa. One is related to Spinosauridae. The other morphotypes show affinities with non-spinosaurid tetanurans, probably related to Carcharodontosauria. Conclusions: The results are congruent with the known theropod record of the Iberian Peninsula and western Europe. This work is a new contribution to what is known of the palaeobiodiversity and distribution of large-bodied theropods from the Barremian of the Iberian Peninsula.Fil: Alonso, A.. Universidad de Zaragoza; EspañaFil: Gasca Pérez, José Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Provincia de Neuquén. Ministerio de Energía, Ambiente y Servicios Públicos. Dirección Provincial de Minería. Museo Provincial de Ciencias Naturales Prof. "Dr. Juan A. Olsacher"; ArgentinaFil: Navarro Lorbés, P.. Universidad de Zaragoza; EspañaFil: Rubio, C.. Paleoymás; EspañaFil: Canudo, J. I.. Universidad de Zaragoza; Españ

Dinosaur swim tracks from the Lower Cretaceous of La Rioja, Spain: an ichnological approach to non-common behaviours

[EN] The reconstruction of behavioural patterns performed by non-avian dinosaurs is an important task of palaeontology in order to globally understand how these animals interacted with their environment. Their relation with aquatic lifestyles has always been an intriguing question that has been extensively studied during the last decades, especially focused on some specific groups. The present work describes a new tracksite with 27 swimming tracks located in a fluvial setting from the Lower Cretaceous Urbion Group of La Rioja (Spain). They are preserved as natural casts with sizes between 8.5 and 29.2 cm and a predominant orientation. The tracks have been classified into 6 different morphotypes according to their morphology, and grouped into 5 different categories depending on the different pes-substrate interactions, following the proposal of Romilio et al. (2013). Some tracks were produced while the animal was moving in partial or complete buoyancy, and displacement was conducted by water and sediment impulsion, not just a mere paddling. Other tracks could be impressed in a bottom-walked, when the trackmaker touched the digit tips on the ground vertically or sub-vertically. This new tracksite confirms the capabilities of some groups of non-avian dinosaurs to interact with shallow water environments where they could print their pedes as they moved, either in complete buoyancy or during a displacement with some vertical component in the water column. It also contributes to the better understanding of swimming track morphologies as especially dependent on pes-sediment interaction and environment more than differences in pes configuration itself, causing the high variability of swimming footprints even when they belong to the same trackway. The classification of swimming tracks and footprints into categories dependent on the pes-substrate interaction could be a good guiding principle to avoid problematics about ichnotaxonomical definition.P.N.-L. is supported by a TALENTO Ph.D grant from Universidad de La Rioja (E-26-2017-0029977); R.S.J.-P is supported by a Ph.D grant from Universidad de la Rioja (E-26-2021-0104021); A.T. is supported by a TALENTO Posdoctoral grant from Consejeria de Educacion y Cultura (Gobierno de La Rioja). Research funded by Instituto de Estudios Riojanos by “Fotogrametría y estudio de un nuevo yacimiento de huellas de dinosaurios en Laguna de Cameros, La Rioja” (Project OTCA210527); La Rioja Government, Spain by “Convenio para la financiacion de actividades de la Catedra Extraordinaria de Patrimonio Paleontologico” in the Universidad de La Rioja, the Ministry of Science, Innovation and Universities of Spain (project CGL2017-85038-P) and the European Regional Development Fund (ERDF). ID-M funded by Unión Europea-NextGenerationEU “Requalification of Spanish university system for 2021–2022” in the UPV-EHU and supported by a Ramón y Cajal fellowship (RYC-2022) and by the Ministry of Science and Innovation of Spain. This study is partially part of the Project PID-2019-105546GB-I00 of the Spanish Ministerio de Ciencia e Innovación.Peer reviewe