Climatic and tectonic controls on carbonate deposition in syn-rift siliciclastic fluvial systems: A case of microbialites and associated facies in the Late Jurassic

This work provides new insights to assess the factors controlling carbonate deposition in the siliciclastic fluvial systems of rift basins. Sedimentological and stable-isotope data of microbialites and associated carbonate facies, along with regional geological information, are shown to reveal the influence of climate and tectonics on the occurrence and attributes of carbonate deposits in these settings. The Vega Formation – a 150 m thick Lower Kimmeridgian siliciclastic fluvial sequence in Asturias Province (northern Spain) – constitutes a candidate for this approach. This unit includes varied facies (stromatolites; rudstones, packstones and wackestones containing oncoids, intraclasts, charophytes and shell bioclasts; marlstones and polygenic calcareous conglomerates) that formed in a low-gradient fluvial–lacustrine system consisting of shallow, low-sinuosity oncoid-bearing channels and pools within marshy areas, with sporadic coarse alluvial deposition. The sedimentological attributes indicate common erosion by channel overflow and rapid lateral changes of subenvironments caused by water-discharge variations. The carbonate fluvial–lacustrine system developed near uplifted marine Jurassic rocks. The occurrence of the system was conditioned by normal faults (active during the deposition of the unit) that favoured: (i) springs of HCO3–Ca-rich water from a Rhaetian–Sinemurian carbonate rock aquifer; and (ii) carbonate deposition in areas partially isolated from the adjacent siliciclastic fluvial system. The microbialite d13C and d18O values support deposition in a hydrologically open system, fed by ambient-temperature meteoric water, with riparian vegetation. Three types of lamination in the stromatolites and oncoids reflect distinct morphological types of cyanobacterial communities. The textural pattern of lamination parallels d13C and d18O changes, suggesting short-term cycles of precipitation and temperature. A moderately to strongly contrasted seasonal and/or pluriannual precipitation regime is inferred from the cyclic d13C pattern of the lamination and from the discontinuous and asymmetrical growth of oncoids. Thus, the isotopic and sedimentological attributes of the carbonate deposits were linked to short-term climate changes associated with semi-arid conditions, consistent with the studied climatic zone

First report of a Late Jurassic lizard-like footprint (Asturias, Spain)

This report describes an isolated footprint preserved as a natural cast (convex hyporelief) from the Lastres Fm. (Late Jurassic) of northern Spain. The track consists of a small isolated pentadactyl ectaxonic right manus footprint. It is very asymmetric, plantigrade, with digits and palm deeply marked on the substrate. Digit IV is the longest, digits II and I are nearly equal in length and only a little shorter than III and IV. The footprint morphology is typical of a lizard – like or “lacertoid” track .The general outline of the footprint, the width to length ratio approximately equal to 1, the marked plantigrady and the substantial similarity in length of digits IV-I are coherent with a Rhynchosauroidea manual print. The global record of Rhynchosauroides ichnogenus shows that this specimen represents the latest occurrence of the ichnogenus. The most probable trackmaker was possibly a rhyncocephalian reptile.Se describe una huella de mano aislada, preservada como contramolde natural (hiporrelieve convexo) de la Formacion Lastres (Jurasico Superior) del N de Espana. La icnita, aislada, pentadactila, ectaxonica y de pequeno tamano, es atribuida a una mano derecha. Es muy asimetrica y plantigrada, con los dedos y la palma profundamente impresos en el sustrato. El dedo IV es el mas largo, mientras que el II y el I son casi iguales en longitud y solamente un poco mas cortos que el III y el IV. La morfologia de la huella es tipica de un lagarto o “lacertoide”. El contorno de la huella, la relacion longitud/anchura en torno a 1, la longitud similar de los dedos I-IV y el hecho de que sea claramente plantigrada son rasgos coherentes con una huella de mano de un Rhynchosauroidea. El registro global de Rhynchosauroides indica que el ejemplar asturiano representa la evidencia mas reciente de este icnogenero. El autor de la huella fue probablemente un reptil rincocefalo

Lower Jurassic bivalves of Suárez Vega collection held at Museo del Jurásico de Asturias (MUJA), Spain

Presentado en la XX Bienal RSEHN, Madrid 2013Los datos obtenidos a partir de colecciones paleontológicas que se encuentran en los museos pueden ser útiles para hacer una estimación de la diversidad así como para estudios paleobiogeográfi cos. Suárez Vega en su Tesis Doctoral sobre el Jurásico de Asturias citó un número importante de especies de bivalvos y su contexto estratigráfico. En 2007, una parte importante de este material fue depositado en el Museo del Jurásico de Asturias. En este trabajo se presentan los resultados de la revisión taxonómica de la colección de bivalvos del Jurásico Inferior de este autor, procedentes de diecisiete afl oramientos distribuidos por toda la Cuenca Asturiana y que corresponden a intervalos estratigráficos diferentes. El mayor número de ejemplares se ha recogido en los acantilados de la Playa de Peñarrubia, Gijón (33%). En conjunto, se han revisado más de 250 ejemplares y alrededor de 200 se han podido determinar específicamente debido a su buen estado de conservación. Corresponden al intervalo Sinemuriense Superior (Cronozona Obtusum)-Toarciense Superior (Cronozona Aalensis), repartiéndose la mayoría entre las cronozonas Obtusum, Oxynotum e Ibex. Con anterioridad a este trabajo la diversidad estaba subestimada y con este estudio se ha ampliado a veintinueve géneros, pertenecientes a once órdenes y veintidós familias. Los géneros mejor representados, en relación con el número total de ejemplares analizados, son Gryphaea (18%), Pholadomya (15%), Semuridia (13%), Pseudopecten (10%) y Pleuromya (7%). Se cita, por primera vez, el género Anningella, que hasta el momento, sólo se había reconocido en Gran Bretaña y, destaca la presencia de otros nuevos taxones para Asturias como son Dacryomya, Palaeoneilo, Modiolus (Cyranus) entre los protobranchios, Semuridia y Meleagrinella entre los pteriomorphios, y Mesomiltha y Unicardium entre los heteroconchios.Data from museum palaeontological collections can contribute to estimates of diversity as well as to palaeobiogeographical studies. Linkages between species occurrence and descriptive information from the fi eld can also be useful to verify taxa and species association occurrences in a space-temporal analysis. This can be especially valuable when data refl ect stratigraphically well-constrained sampling intervals. Part of the scientifi c research of Suárez Vega was dedicated to the Jurassic stratigraphy of Asturias (N Iberian Peninsula). He made a diverse and extensive palaeontological collection of material between the late 1960s and early 1970s, leading to his PhD thesis publication in 1974, “Estratigrafía del Jurásico en Asturias”. In that work he refers to some signifi cant bivalve occurrences observed and cited in their stratigraphical context. In 2007 Suárez Vega donated his collections to the Museo del Jurásico de Asturias (MUJA), where it was incorporated and has been held and curated ever since. A re-evaluation study was carried out on the Suárez Vega Lower Jurassic bivalve specimens at MUJA. Twenty-eight fossil sites were analysed, providing bivalve material from several sections showing distinct space-temporal resolution of the Asturian basin. The localities range from E to W, from Ribadesella to Playa de Peñarrubia (Gijón) respectively, on the coast and with others provenances from inner parts of Asturias such as Borines (Piloña). Most sections represent short chronostratigraphies with the exception of the coastal cliff sections, although these are almost impossible to sample in good conditions or they are completely inaccessible due to urban development. The major bivalve material comes from Playa de Peñarrubia (33%), Santa Mera (8%), Villaviciosa (8%), and Péon (10%) sections, but there are fourteen other localities with less abundance. The collected material corresponds and refl ects well exposed sections with abundant strata surfaces or shell concentrations in exceptionally preserved conditions as in Peón. The Lower Jurassic bivalve analysed material comprises more than 250 specimens; the large majority of them (ca 200) were indentifi ed to species level because of their well preserved nature. They span from the Upper Sinemurian (Obtusum Chronozone) to the Upper Toarcian (Aalensis Chronozone) and most of the specimens are equally represented in the Obtusum, Oxynotum and Ibex chronozones. The apparent diversity is equitable distributed in these chronozones too. The diversity of bivalve taxa cited for all the time intervals in Asturias in previous publications were underestimated and our re-evaluation suggest 31 genera and 39 species, representing 24 families and 12 orders. The most represented genera, in terms of total number of specimens, are Gryphaea (18%), Pholadomya (15%), Semuridia (13%), Pseudopecten (10%) and Pleuromya (7%). These data are refl ected at family level with Gryphaeidae (17%), Pectinidae (15%), Pholadomyidae (15%) and Pergamidiidae (13%). Therefore the major represented orders are: Ostreida (33%), Pectinida (33%) and Pholadomyida (16%). The occurrence of pectinoid Anningella outside of Great Britain is recognized for the fi rst time. We also record new occurrences for Asturias for the protobranchs Dacryomya, Palaeoneilo, Modiolus (Cyranus), the pteriomorphs Semuridia and Meleagrinella, and the heteroconchs Mesomiltha and Unicardium. Although the Suárez Vega collection was biased by fi eld collecting methodology, these precise data are important for palaeobiogeographical analysis on the same interval in NW European Provinces. This revision provides and updated bivalve biodiversity data set allowing the comparison between Asturias with other nearby basins like Lusitanian (Portugal), Basque-Cantabrian basin and Iberian Ranges (NE to E of Spain). In future studies this information will be integrated in palaeontological analysis with newly collected material from the same time and space intervals in order to better understand the palaeoceanographic dynamics of these faunas.Depto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasTRUEMinisterio de Ciencia e Innovación (MICINN)pu

Analysis of disaggregation techiques applied to satellite images for the estimation of surface termal parameters at different scales

During the last years, both the technological development and the greater availability of geospatial information have led to the emergence of new application areas for remote sensing techniques. This is also relevant in the case of thermal remote sensing. Applications such as crop tracking require a greater availability of thermal information with spatial resolutions appropriate for a more local level scope. However, and despite the increasing availability of remote sensing products that have appeared and are expected to appear in the coming years, thermal infrared data continue to be available at lower spatial resolutions than the visible and nearinfrared data. Numerous authors have developed or tested methods to extract information at the sub-pixel level by using complementary remote sensing products with suitable results for using in applications at higher scales. Most of these methods are based on correlations between some vegetation indexes, such as NDVI, and radiative temperatures for a given cover. They are based on traditional mathematical models, such as linear or quadratic regression. Despite newer analysis tools like Support Vector Machines (SVM) or Neural Networks (NN) have become relevant in the last decade, their application on thermal remote sensing is in an relatively early stage of research and the use of traditional methods remains nowadays. The objective of this study is carrying out a comparison of these methods. A downscaling process from a MODIS temperature product scene has been developed using different methodologies. The results have been evaluated using “in situ” (ground-truth) temperature measurements showing an estimate of the accuracy and the potential of two different techniques

3Dpaleo.net, una plataforma web de fósiles en 3D hiperrealista para fomentar la difusión y el conocimiento del patrimonio paleontológico

3Dpaleo.net es una plataforma web en fase de desarrollo que muestra modelos tridimensionales hiperrealistas y en alta definición de algunos de fósiles más emblemáticos del Museo de Ciencias Naturales de la Universidad de Zaragoza y del Museo del Jurásico de Asturias (MUJA), colaboradores de la primera fase del proyecto. Se trata de una iniciativa promovida por la empresa Paleoymás con el fin de explorar y explotar las posibilidades de las nuevas tecnologías, aplicándolas a la divulgación de la paleontología y a la mejora de técnicas expositivas y de difusión del conocimiento. 3Dpaleo.net facilita, a través de internet, la visualización de los fósiles y de algunos de sus detalles más interesantes. 3Dpaleo.net is a website, under development, that shows high definition hyperrealistic 3D models of some emblematic fossils of the museums that have collaborated in this first stage of the project: The Natural Sciences Museum of the University of Zaragoza and the Jurassic Museum of Asturias (MUJA). It is promoted by Paleoymás with the aim of exploring and developing the possibilities of new technologies, applying them to the popularization of paleontology and the improvement of both; expositive technics and knowledge sharing. 3Dpaleo.net helps through the internet to display fossils and some of their most interesting details

Diseño y simulación de una rectenna para cosechar energía electromagnética a 2.4 GHz

Trabajo de InvestigaciónSe realizó el diseño y la simulación de una antena rectificadora con tecnología microcinta a 2.4 GHz junto con un filtro pasa-banda chebyshev de octavo orden y un rectificador de onda completa tipo puente de diodos con el fin de obtener la conversión de ondas electromagneticas a una señal DC.INTRODUCCIÓN 1. GENERALIDADES 2. RECTENNAS Y HERRMANIENTAS DE SIMULACIÓN 3. DISEÑO DE UNA ANTENA RECTIFICADORA A 2.4 GHz 4. DISEÑO Y SIMULACIÓN DE LA ANTENA RECTIFICADORA 5. CONCLUSIONES 6. RECOMENDACIONES Y TRABAJOS FUTUROS 7. ESTRATEGIAS DE COMUNICACIÓNPregradoIngeniero Electrónic

Development of the Senegal sole, Solea senegalensis forebrain

8 páginas, 4 figuras.The present paper deals with the ontogeny of the forebrain of the flatfish Senegal sole, Solea senegalensis, through different developmental stages before and after to metamorphosis. A first approach was made by conventional histological techniques, which allowed the determination of the main ontogenetic events. A second approach was to analyze the proliferation zones (PZ) during development and their locations, as well as the relation between them and the telencephalic asymmetry of the Senegal sole. The results show that before metamorphosis the Senegal sole goes through a fast development. The pituitary is visible 1 day after hatching (DAH), the inferior lobes of the hypothalamus appear 3 DAH, and the olfactory bulb and the differentiation between telencephalon and diencephalon are present around 4 DAH. In addition, by applying proliferating cell nuclear antigen (PCNA) immunohistochemistry by means of a monoclonal antibody against the PCNA and ABC complex, we were able to determine the PZs in the forebrain of pre- and post- metamorphic specimens. Although in both cases the PZs were similar, in premetamorphic animals they were thicker. However, PZs were observed in the pallium and subpallium, preoptic region, pretectum, epithalamus, dorsal and ventral thalamus, posterior tuberculum and hypothalamus. In all cases the PZs, mainly focusing on the telencephalon, were symmetrical in both hemispheres.This work was supported by a grant to C.P. from the Spanish Ministerio de Educación y Ciencia and partially by ICMAN.CSIC and Spanish Project (MCYT/AGL2003-03558).Peer reviewe