Conodontos del Wenlock y Ludlow (Silúrico) del Valle de Tena (Pirineos Aragoneses)

Abstract

Silurian rocks from the Ten a Valley (Aragonian Pyrenees) are subdivided into three informal lithostratigraphic units: Unit «A», «Capas de Hoz», and Unit «8». The «Capas de Hoz» unit contains a rich conodont sequence spanning from Homerian to lower Ludfordian stages (Wenlock to Ludlow) that is described for the first time. This sequence is composed of three successive biostratigraphic units: Pseudooneotodus bicornis Fauna; Kockelella variabilis Zone and Polygnathoides siluricus Zone. The last two are worlwide widespread and, can, thus, be used for correlation purposes. Initially the sequence of fauna and rocks from the Tena Valley is compared to two sections in the Carnic Alps