Person: Díaz Molina, Margarita
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First Name
Margarita
Last Name
Díaz Molina
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Area
Estratigrafía
Identifiers
5 results
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Item Chert in bioturbated sediments of Sabkha paleoenvironment(Abstracts: Flint production and exchange in the Iberian Southeast, III Millennium B.C : VI International Flint Symposium, post-symposium field trip, OCtober 5th-10th,1991, Granada-Almería / by A. Ramos Millán ... [et al.], 2001) Arribas Mocoroa, José; Bustillo Revuelta, María Ángeles; Díaz Molina, Margarita; Bustillo Revuelta, María Ángeles; Ramos Millán, A.Item Efectos de la separación de flujo en las secuencias de barras de meandro. Ejemplos del Oligoceno Superior de la Cuenca de Loranca(Geotemas, 2008) Muñoz García, María Belén; Díaz Molina, MargaritaEl registro estratigráfico del Eoceno-Mioceno de la cuenca de Loranca está formado por sedimentos fluviales, aluviales y lacustres. Durante el Oligoceno Superior los depósitos de ríos meandriformes del abanico fluvial de Tórtola se extendieron por el centro de la cuenca y su margen oeste. Las barras de meandro del abanico de Tórtola presentan diferencias con el modelo de facies básico, en el que la secuencia de estructuras sedimentarias está producida por una disminución de la velocidad de la corriente. Las secuencias fining-upwards graduales no son las más frecuentes en las barras de meandro del Oligoceno de la cuenca de Loranca. La estructura sedimentaria más abundante es la estratificación cruzada de pequeña escala rellenando surcos erosivos, que puede presentarse en toda la sección de la barra de meandro. La estratificación cruzada de ripples compone a su vez otras formas del lecho que se caracterizan por una morfología de crestas longitudinales. Estas formas compuestas se interpretan como formas del lecho generadas por vórtices espirales en zonas de separación de flujo.Item Acercamiento a la muerte de un renacuajo en el Mioceno a través de una trama policíaca(Sin ciencia no hay cultura: III Congreso sobre Comunicación Social de la Ciencia. Libro de actas, 2006) Bustillo Revuelta, María Ángeles; Aparicio, H.; Rodríguez Talavera, María del Rosario; López Martínez, Mª J.; Díaz Molina, MargaritaItem Depositional setting and early diagenesis of the dinosaur eggshell-bearing Aren Fm at Bastus, Late Campanian, south-central Pyrenees(Sedimentary geology, 2007) Díaz Molina, Margarita; Kälin, Otto; Benito Moreno, María Isabel; López Martínez, María Nieves; Vicens, EnricThe Late Cretaceous Aren Fm exposed north of Bastus in the Tremp Basin (south-central Pyrenees) preserves an excellent record of dinosaur eggs laid in a marine littoral setting. Different from other cases reported in literature, at the Bastus site the preferential nesting ground was original beach sand. The coastal deposits of Aren Fm can be grouped into four facies assemblages, representing respectively shoreface, beachface, beach ridge plain and backbarrier lagoon environments. Shoreface deposits include fine- to coarsegrained hybrid arenites and subordinate quartz-dominated conglomerates with ripple structures of wave and wave-current origin. Beachface deposits are mainly storm beach conglomerates, but parallel-laminated foreshore arenites locally occur. Backbarrier lagoon deposits comprise of washover sandy conglomerates that grade laterally into sandy lime mudstones, biomicrites and marls. Beach ridge sediment, wherein the bulk of dinosaur eggs and eggshell debris occurs, predominantly is a reddish hybrid arenite that has undergone a complex early diagenetic evolution, including marine and meteoric cementation followed by soil development. The reddish arenites overlie wave-dominated shoreface deposits and in places pass laterally into lagoonal deposits. They originally formed shore ridges, that became stabilized during progradational episodes by pedogenesis (beach ridge, sensu[Otvos, E.G., 2000. Beach ridges—definitions and significance. Geomorphology 32, 83–108.]), which also affected the dinosaur eggs. The eggshell-bearing beach ridge arenites are typically preserved at the top of parasequences forming the systems tracts of a third-order sequence. Thick packages of this facies resulted from aggradation of barrier/beach ridge deposits, whose preservation below surfaces of transgressive erosion was favoured by incipient lithification.Item Dinosaur nests at the sea shore(Nature -London, 2002) Sanz , J.L.; Moratalla, J.J.; Díaz Molina, Margarita; López Martínez, María Nieves; Kälin, Otto; Vianey-Liaud, M.