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

Más allá de los dinosaurios: nuevas perspectivas para el patrimonio paleontológico de La Rioja

El patrimonio paleontológico en nuestro país ha sido objeto de discusión entre científicos y legisladores desde su controvertida consideración dentro del patrimonio histórico en la Ley 16/1985, de 25 de junio, del Patrimonio Histórico Español. Así, tanto el patrimonio inmueble (yacimientos) como el mueble (ejemplares ex situ alojados en museos, colecciones y exposiciones locales) se gestionaron durante años bajo esta norma hasta su inclusión, en el año 2007, en la nueva Ley 42/2007, de 13 de diciembre, de Patrimonio Natural y Biodiversidad.Fil: García Ortiz de Landaluce, Esperanza. Universidad de la Rioja; EspañaFil: Díaz Martínez, Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina. Universidad Nacional de Rosario; ArgentinaFil: Torices Hernandez, Angelica. Universidad de la Rioja; EspañaFil: Ferrer Ventura, Mireia. Universidad de la Rioja; EspañaFil: Navarro Lorbés, Pablo. Universidad de la Rioja; EspañaFil: San Juan Palacios, Raúl. Universidad de Valencia; Españ

Los reptiles del yacimiento cenomaniense de Algora (Guadalajara, España): nuevos datos y síntesis faunística

International audienc

Update on the Cenomanian vertebrates from Algora (Guadalajara, Spain):new data on the faunal transition between the Early and the Late Cretaceous of Europe

International audienceThe largest concentration of vertebrate macroremains for the Cenomanian of south-westernEurope has been recognized at the palaeontological area of Algora (Guadalajara Province, centralSpain). The study of the taxa identified there provided new information about the palaeobiogeographyand temporal distributions of some lineages, and increased knowledge about the poorly-known transition between the Lower and the Upper Cretaceous faunas in Europe. The presenceof eight taxa was confirmed there: the lepisosteoid fish Obaichthys africanus; the helochelydridturtle aff. Plastremys lata; the bothremydid turtle Algorachelus peregrina; an indeterminate elasmosauridplesiosaur; a non-eusuchian neosuchian and a eusuchian crocodyliform; an indeterminatelithostrotian titanosaur; and an indeterminate theropod probably belonging to Abelisauridae.Recent fieldwork campaigns, performed in 2019 and 2021, provided more than 1,200 new vertebrateremains, including those of clades poorly represented so far, as well as others hithertounknown at this site. Therefore, the faunal list can be remarkably increased. In this sense, severaltaxa of Osteichthyes have been found, and chondrichthyan remains are also recognized there forthe first time. New remains of crocodyliforms, theropods and sauropods allow to analyze, in moredetail, the systematic attribution of the representatives of these lineages present in Algora. Notonly new relevant specimens of helochelydrids and bothremydids stand out among the numerousfinds of turtles (which allow a better understanding of the anatomy of the represented species),but especially the discovery of the partial skeleton of a relatively large cryptodiran sea turtle(including, among other elements, the carapace, with more than 1 meter in length, and the skull).In addition, other lineages hitherto unrecognized at this fossiliferous locality, such as a squamatewith aquatic affinities, are identified. The main novelties in knowledge about the Cenomanian vertebratefauna of Algora are presented here, and the palaeobiogeographical implications of severalof the new finds are discussed

Update on the Cenomanian vertebrates from Algora (Guadalajara, Spain):new data on the faunal transition between the Early and the Late Cretaceous of Europe

International audienceThe largest concentration of vertebrate macroremains for the Cenomanian of south-westernEurope has been recognized at the palaeontological area of Algora (Guadalajara Province, centralSpain). The study of the taxa identified there provided new information about the palaeobiogeographyand temporal distributions of some lineages, and increased knowledge about the poorly-known transition between the Lower and the Upper Cretaceous faunas in Europe. The presenceof eight taxa was confirmed there: the lepisosteoid fish Obaichthys africanus; the helochelydridturtle aff. Plastremys lata; the bothremydid turtle Algorachelus peregrina; an indeterminate elasmosauridplesiosaur; a non-eusuchian neosuchian and a eusuchian crocodyliform; an indeterminatelithostrotian titanosaur; and an indeterminate theropod probably belonging to Abelisauridae.Recent fieldwork campaigns, performed in 2019 and 2021, provided more than 1,200 new vertebrateremains, including those of clades poorly represented so far, as well as others hithertounknown at this site. Therefore, the faunal list can be remarkably increased. In this sense, severaltaxa of Osteichthyes have been found, and chondrichthyan remains are also recognized there forthe first time. New remains of crocodyliforms, theropods and sauropods allow to analyze, in moredetail, the systematic attribution of the representatives of these lineages present in Algora. Notonly new relevant specimens of helochelydrids and bothremydids stand out among the numerousfinds of turtles (which allow a better understanding of the anatomy of the represented species),but especially the discovery of the partial skeleton of a relatively large cryptodiran sea turtle(including, among other elements, the carapace, with more than 1 meter in length, and the skull).In addition, other lineages hitherto unrecognized at this fossiliferous locality, such as a squamatewith aquatic affinities, are identified. The main novelties in knowledge about the Cenomanian vertebratefauna of Algora are presented here, and the palaeobiogeographical implications of severalof the new finds are discussed

The Cenomanian vertebrates from the Algora site (central Spain): New information on the faunal replacement between the European Lower and uppermost Cretaceous faunas

International audienc

The singular Upper Cretaceous vertebrate sites of the Guadalajara Province (Central Spain): New data on the faunas from the Cenomanian of Algora and the Uppermost Cretaceous of Poyos

International audienceThe Cretaceous vertebrate fauna of the Guadalajara Province (Castilla-La Mancha, CentralSpain) was unknown until a few years ago. In fact, the systematic excavation campaigns inGuadalajara began in 2013, those carried out in 2016 and 2017 being especially relevant.These works were performed in two fossiliferous areas, separated from each other by about60 km, both located in the Castilian Branch of the Iberian Ranges: the Cenomanian area ofAlgora, especially the ALG-B site (Algora municipality); and the uppermost Cretaceousoutcrops of the western margin of the Buendía Reservoir, especially the Poyos site(Sacedón municipality).Localities with fossil vertebrates from the lower part of the Upper Cretaceous are veryscarce in Europe and, to date, the locality of Algora shows the highest concentration ofvertebrate remains recognized in the Cenomanian of this continent. Thus, the fossils fromAlgora add important data for the understanding of the faunal turnover recognized whenthe Lower Cretaceous and the uppermost Cretaceous faunas are compared. The study ofthe new remains presented here allows us to analyze in more detail the fauna of fishes,characterize the primitive turtle members present in this locality, know new anatomicalcharacters for the oldest European pleurodiran turtles, identify and describe remains ofelasmosaurids, recognize the presence of eusuchian crocodyliforms, describe the oldestlithostrotian titanosaurs of the Iberian Peninsula, and perform a detailed analysis of thetheropod fauna. Several lineages from this site show a Gondwanan origin.Poyos is an uppermost Cretaceous site located in one of the worldwide largest dinosaurnesting areas, found in 2016. Thus, these fossiliferous levels extends over more than 10km. With the exception of an isolated vertebral centrum of a titanosaur sauropod, no otherspecimen from this locality has been published so far. The preparation of the fossils foundin 2006 and 2017 allows us to analyze both oological and osseous remains. Not onlyisolated sauropod eggshells, but also complete eggs and several dinosaur clutches, havebeen found. They show several singularities relative to both the microstructure of theeggshells and the disposition of the eggs, in relation to those previously found in otheruppermost Cretaceous Iberian regions. In addition to elements of bothremydid turtles andprobably allodaposuchid crocodiles, the remains of dinosaurs are abundant in this region,including several partial skeletons. Among them, a probable new middle-sized theropod isidentified.Grant InformationMinisterio de Economía, Industria y Competitividad (CGL2015-68363-P, IJCI-2016-30427) and Viceconsejería de Cultura de Castilla-La Mancha (SBPLY/0021-0070)

Geodivulgar: Geología y Sociedad

Memoria final del Proyecto Innova Docencia 2023-23 nº 58. GEODIVULGAR: Geología y SociedadUCMDepto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasFALSEsubmitte