Mamíferos del Mioceno inferior de las Bardenas Reales de Navarra (Cuenca del Ebro, Península Ibérica)

Munibe 01/2004; 55:7-102.
Source: OAI


Las Bardenas Reales de Navarra se encuentran en el borde NW de la cuenca terciaria del Ebro. Los sedimentos que podemos encontrar en la mayor parte del área de estudio pertenecen a facies fluvio-palustres de la Formación Tudela. Las localidades fosilíferas estarían incluidas dentro de la Biozona MN2b-MN3 (Biozonas Z-A del Rambliense o Aquitaniense superior-Burdigaliense inferior). En esta área se han encontrado restos fósiles de peces, anfibios, lagartos, anfisbénidos, serpientes, tortugas, cocodrilos, flamencos y los mamíferos que se describen en este trabajo como insectívoros, quirópteros, castores, eomíidos, glíridos, esciúridos, cricétidos, lagomorfos, perisodáctilos y artiodáctilos. The Bardenas Reales of Navarre are located on the NW border of the tertiary Ebro basin. Most of the deposits in the area correspond to fluvio-palustrine facies of the Tudela Formation. The fossiliferous localities probably belong to the Biozones MN2b-MN3 (Biozones Z-A of the lower Ramblian or upper Aquitanian-lower Burdigalian). The fossil remains belong to fish, flamingos and the mammals here described, such as insectivorous, chiropterans, beavers, eomyids, glirids, sciurids, cricetids, lagomorphs, perissodactyls and artiodactyls.

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    • "A detailed paleontological survey of the Bardenas Reales has yielded 16 fossil localities, all within palustrine-lacustrine grey marls, distributed throughout the Tudela Formation. This ongoing survey has resulted in the recovery of fossil remains of a wide variety of vertebrates such as reptiles (lizards, amphisbaenians, snakes, turtles, and crocodilians [9], [10]), amphibians (anurans and urodeles [9]), bony fish (Cypriniformes [9]), birds [9], and mammals (insectivores, chiropters rodents, lagomorphs, artiodactyls and perissodactyls [9], [11], [12], [13]). Turtles, crocodiles, amphibians, and fish are autochthonous lacustrine-palustrine faunal components. "
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    ABSTRACT: We describe the first occurrence in the fossil record of an aquatic avian twig-nest with five eggs in situ (Early Miocene Tudela Formation, Ebro Basin, Spain). Extensive outcrops of this formation reveal autochthonous avian osteological and oological fossils that represent a single taxon identified as a basal phoenicopterid. Although the eggshell structure is definitively phoenicopterid, the characteristics of both the nest and the eggs are similar to those of modern grebes. These observations allow us to address the origin of the disparities between the sister taxa Podicipedidae and Phoenicopteridae crown clades, and traces the evolution of the nesting and reproductive environments for phoenicopteriforms. Multi-disciplinary analyses performed on fossilized vegetation and eggshells from the eggs in the nest and its embedding sediments indicate that this new phoenicopterid thrived under a semi-arid climate in an oligohaline (seasonally mesohaline) shallow endorheic lacustine environment. High-end microcharacterizations including SEM, TEM, and EBSD techniques were pivotal to identifying these phoenicopterid eggshells. Anatomical comparisons of the fossil bones with those of Phoenicopteriformes and Podicipediformes crown clades and extinct palaelodids confirm that this avian fossil assemblage belongs to a new and basal phoenicopterid. Although the Podicipediformes-Phoenicopteriformes sister group relationship is now well supported, flamingos and grebes exhibit feeding, reproductive, and nesting strategies that diverge significantly. Our multi-disciplinary study is the first to reveal that the phoenicopteriform reproductive behaviour, nesting ecology and nest characteristics derived from grebe-like type strategies to reach the extremely specialized conditions observed in modern flamingo crown groups. Furthermore, our study enables us to map ecological and reproductive characters on the Phoenicopteriformes evolutionary lineage. Our results demonstrate that the nesting paleoenvironments of flamingos were closely linked to the unique ecology of this locality, which is a direct result of special climatic (high evaporitic regime) and geological (fault system) conditions.
    PLoS ONE 10/2012; 7(10):e46972. DOI:10.1371/journal.pone.0046972 · 3.23 Impact Factor
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    ABSTRACT: Se estudian y describen 130 restos dentales aislados, un fragmento de maxilar y cuatro fragmentos hemimandibulares de Cainotherium de un nuevo yacimiento, Alameda de Osuna, del Aragoniense medio de la Cuenca de Madrid. El estudio realizado ha permitido determinar la presencia de una especie de Cainotherium de talla pequeña que se cita por primera vez en el registro español, Cainotherium cf. huerzeleri HEIZMANN, 1983 y correlacionar este nivel con los yacimientos del área urbana de Madrid pertenecientes a la MN5 (zona local D). [ABSTRACT] 130 isolated dental remains, one maxilar and four mandibular portions of Cainotherium have been described and studied from Alameda de Osuna, Middle Aragonian of the Madrid Basin. This study has allowed to confirm the presence of one small size Cainotherium specie cited for the first time in the Spanish record, Cainotherium cf. huerzeleri. Alameda de Osuna has been correlated to other Madrid sites belonging to the MN5 (local zone D).
    01/2011; 59.
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    ABSTRACT: The calibration of European Lower Miocene continental stages is poorly constrained due to the lack of robust magnetostratigraphic data from continental sediments of this age. In this paper, we present the first magnetostratigraphic results from the mammal fossil-bearing continental sediments of the Lower–Middle Miocene Tudela Formation (western Ebro basin, Spain). The study is based on 331 paleomagnetic sites distributed along a 790-m-thick composite section. The resulting magnetostratigraphy provides an independent correlation to the geomagnetic polarity time scale and allows accurate dating of previously known and new Ramblian (upper Lower Miocene) fossil localities of the Tudela Formation.The new age constraints derived for the Tudela Formation fossil localities provide, together with a revaluation of other Iberian faunas, the first magnetochronology for the Ramblian continental stage. The lower boundary of the Ramblian is placed at the lower part of chron C6r (ca. 20.4 Ma), and the boundary between the lower and upper Ramblian is located at the middle of chron C6n (ca. 19.6 Ma). The upper boundary of the Ramblian, and hence the base of the Aragonian, is placed at the upper middle part of chron C5Cr (16.8–17 Ma). Our results also provide the first magnetostratigraphically dated MN3 faunas in Spain, which, together with a revaluation of other Iberian and European faunas, provide a revised calibration of European mammal zone MN3. The lower boundary of zone MN3 is placed at the boundary between chrons C6r and C6n (ca. 20.1 Ma), and its upper boundary is located at the upper middle part of chron C5Cr (16.8–17 Ma).
    Earth and Planetary Science Letters 03/2006; 243(3-4-243):409-423. DOI:10.1016/j.epsl.2006.01.034 · 4.73 Impact Factor
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