Rasgos estratigráficos de la sucesión del Ordovícico Superior en Portilla de Luna (Zona Cantábrica, noroeste de España)

Upper Ordovician rocks have been characterized for the first time in the Cantabrian Zone of the Hesperian Massif. The sequence consists of a lower siliciclastic unit of Caradoc-?basal Ashgill age developed as an alternation ofshales, siltstones and sandstones, overlain by an upper unit of fossiliferous limestones with marly intercalations, of pre-Hirnantian (mainly Cautleyan-Rawtheyan) age. Ashgill fossils are fairly abundant in the limestone unit, and there have been identified brachiopods of the "Nicolella fauna", echinoderms of the "Heliocrinites fauna" and trilobites of the Ovalocephalus biofacies.

4 páginas, 3 figuras.-- Comunicación presentada en el IV Congreso Nacional de Geología, Alcalá de Henares, 1996.

Este artículo es una contribución a los Proyectos PB91-0671 y PB94-1330 de la DGICYT.

Peer reviewed

Country

Spain

Related Organizations

Spanish National Research Council
Spain
University of Huelva
Spain

Keywords

Lithostratigraphy, Cantabrian Zone, Spain, Ordovician, Biostratigraphy

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