Las "sand waves" calcareníticas del Río Alías (Mioplioceno de la Cuenca de Níjar, Almería)

Abstract

[ES] Las calcarenitas marinas someras del Plioceno del Río Alías se depositaron en un umbral que separaba dos cuencas marinas. Alli migraban distintas formas de fondo movidas por corrientes de deriva, de dirección E-W y sentidos cambiantes, generadas por las tormentas y vientos dominantes en la región.

[EN] The shallow-marine Pliocene succession of Rio Alias (fig. 1) consists of deposits laid down by prograding shallow shelf-talus and fan delta systems (fig. 2). The lower calcarenite member displays largescale sets of cross-bedding (fig. 3, lam. 1 fots. 1, 3) that are sudied in detail (lam. 1 fots. 2, 4, 5). Lack of definite tide-generated features, together with repeated intense burrowing of some of the foreset laminae, lead to invoke wind-driven currents, induced by storms blowing from E and W, forced through a narrow, shallow pass between two emergent islands, where the flow accelerated (fig. 4).