IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
capítulos de libros
Título:
Miocene and modern tidal deposits of the Valdes Peninsula. Guía de Campo, Field Trip 3
Autor/es:
SCASSO, R.A.; CUITIÑO, J.I.; BOUZA, P.,
Libro:
Proceedings of the 9th International Conference on Tidal Sedimentation
Editorial:
Asociación Argentina de Sedimentología
Referencias:
Lugar: Puerto Madryn; Año: 2015; p. 1 - 55
Resumen:
The Cenozoic succession of the Puerto Madryn-Valdés Peninsula region is composed of flat lying strata on top of a Jurassic volcanic basement known as Marifil Formation (Scasso et al., 2010). The Cenozoic succession wedges out to the west but it thickness greatly increase in the Atlantic shelf, to the east, where the Valdés and Rawson basins are located (Marinelli and Franzin, 1996). The local stratigraphic column at Puerto Madryn-Valdés Peninsula area starts with the whitish Early Miocene ?Patagoniense? beds (Gaiman Formation), which are covered by yellowish-rusty brown early late Miocene ?Entrerriense? beds. This unit passes transitionally upward to the late Miocene ?Rionegrense? beds of predominantly gray colors (Feruglio, 1949). Both, ?Entrerriense? and ?Rionegrense? beds form a more than 150 m thick succession of heterolithic and cross-bedded sandstones, muddy sandstones, and sandy shales interbedded with whitish tuffs and distinctive shell-beds (coquinas). Haller (1979) and Haller et al. (2001) grouped the ?Entrerriense? and ?Rionegrense? beds, which are chronostratigraphic units, under the lithostratigraphic unit delineated as the Puerto Madryn Formation.