Gutiérrez Marco, Juan CarlosAramburu, C.Arbizu, M.Méndez Bedia, I.Rábano, IsabelVillas, E.2015-11-242015-11-241996http://hdl.handle.net/10272/11425Upper 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 of shales, 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 Qvalocephalus biofaciesspaAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/OrdovicianLithostratigraphyBiostratigraphyCantabrian ZoneSpainjournal articleopen access