The Buntsandstein sequence of the central area of Spain ranges from a variety of fluvial facies, low in the succession, to tidal mudstones and carbonates in the youngest and most eastem areas. This paper is restricted to the conglomera tes in the lowest part of the fluvial sequence. These were deposited in bar and channel systems dominated by gravelly, low-sinuosity braided streams. Their distribution reflects both the pre-existing topography and synsedimentary tectonic movements.Six main facies have been distinguished (in order of decreasing abundance): sheets of massive conglomerates, channel-fill conglomera tes, coarse-medium sandstones, lateral accretion conglomera tes. tabular cross-stratified conglomera tes, fine-grained sediments.Sheets of gravels, formed as longitudinal bars, were by far the major feature of sediment accumulation. Units of lateral accretion, if not ver y frequent, are quite important as they probably represent modifications of bars during waning stage.Two big cycles may be seen in these conglomera tes. They correspond to different physiographic models. The lower cycle was mainly formed by smaller channels and bars than was the upper cycle. The lower cycle is mainly formed by channel deposits, whilst in contrast, the upper cycle is mainly made up of longitudinal bars.The change in sedimentation may be due to tectonic movements that occurred in the basin during Buntsandstein deposition.
El cambio tecnológico durante décadas ha incidido para que el mercado laboral seleccione a personas con mayor preparación en años de estudios, experiencia laboral, o habilidades relativas, como los primeros candidatos. Diferentes estudios apoyan la hipótesis propuesta que los cambios en la estructura salarial están relacionados con innovaciones en el desarrollo tecnológico. En esta investigación se parte de la hipótesis de cambio técnico sesgado (HTCS), que provoca la desigualdad de salarios de trabajadores, en el periodo 2010 -2020, según la cual la disparidad entre los salarios de trabajadores calificados y de trabajadores no calificados son un resultado de la innovación de las tecnologías disruptivas, que caracterizan a la Cuarta revolución 4.0, y provocan un sesgo hacia trabajadores con mayor calificación. Por lo tanto, se analiza la "
Non-marine redbeds (Permian and Triassic) in the island of Mallorca consist of a 0.4 km-thick alluvial succession that passes upwards into siliciclastic-carbonate coastal deposits. Tectonics and sealevel changes have been the main influences in their evolution. Low in this succession (the 'Areniscas y lutitas de Port des Canonge* unit) sandstone sheets with lateral accretion surfaces (macroscale inclined strata) and mudstones with frequent exposure structures are interpreted as the products of a sinuous alluvial system and floodplain. Climatic fluctuations are considered to be responsible for some significant up-section changes in the evolution of the alluvial deposits. Low-angle or horizontally stratified sandy units, interpreted as the result of flash floods, alternate upwards with point-bar deposits in the 'Areniscas de AsS'. The hydrological response to minor climatic changes was evidently nearly instantaneous due to the lack of significant vegetation cover.During accumulation of mudstones and sandstones of the overlying 'Lutitas y Areniscas de Son Serralta' unit, the interpreted environment of deposition changed from a distal braidplain, mainly constructed by superposition of sandy bedforms with straight or linguoid crestlines in low sinuosity river channels, into a coastal plain with evidence of both continental and marine influences. The overlying carbonate platform (Muschelkalk) marks the development of a more homogeneous marine environment resulting from the Tethyan transgressive event that affected the whole peri-Mediterranean realm during the Anisian (middle Triassic).
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