Lower Jurassic deposits of the middle section (19 m) of Remoredo Formation at Arroyos Montanes, Montanesito and El Yeso, and their oncoids are described. Three main facies are considered: limestones with oncoids, claystones and pyroclastics. According to layer configuration the oncoids can be assigned to Type I and hybrids I3-I. The continuous micritic laminations suggest agitated conditions, and the discontinuous laminations reflect short periods of non agitation or tranquility. The oncoids are associated with a well preserved faunal assemblage of ostracods and some fragments of bivalves that are indicative of shallow water conditions. The facies are interpreted as the products of deposition in a shallow-water lake, constituting a coarsening-upward sequence and a progressive infilling by pyroclastic subaqueous flows. -from English summary
| Documento: | Artículo |
| Título: | Lacustrine deposits and oncoids at the middle section of the Remoredo Formation (Precuyano), Rio Grande Valley, Mendoza) |
| Autor: | Lanes, S.; Palma, R.M. |
| Filiación: | Fac de Ciencias Exactas y Naturales, Univ de Buenos Aires, Ciudad Univ, Pabellon 2, Buenos Aires, Argentina, Argentina |
| Palabras clave: | Jurassic; lacustrine deposit; lake sediment; oncoid; pyroclastic flow; Remoredo Formation; sedimentary facies; Argentina; Mendoza; Rio Grande Valley |
| Año: | 1993 |
| Volumen: | 48 |
| Número: | 3-4 |
| Página de inicio: | 317 |
| Página de fin: | 322 |
| Título revista: | Revista - Asociacion Geologica Argentina |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS00176_v48_n3-4_p317_Lanes |
