Análisis de microfacies de los montículos de la Formación Cosgaya. Sección de Las Ilces, Pensilvánico, Cantabria

Abstract

The Potes Group (Pennsylvanian, Liébana Valley, Cantabria N Spain) is composed of a rhythmic succession of shales and sandstones and contain the Cosgaya Formation. The Cosgaya Formation is composed of organic limestones that show abundant algae and corals and locally form mounds. Those mounds are conspicuous at Las Ilces Section where seven microfacies have been identified: MF-1, Bioclastic wackestone with Donezella stabilizing patches; MF-2, Boundstone of stabilizing and supporting organisms; MF-3, Boundstone/Packstone of intraclasts and peloids; MF-4, Bioclastic Wackestone/Packstone; MF-5, Donezella Boundstone/Packstone; MF-6, Bioclastic and peloidal Packstone; MF-7, Mudstone/wackestone with calcisferas and ostracods. These microfacies correspond to diferent parts (or zones) of mounds formed by microbial communities, algae and corals and the close areas of them.