Abstract

HEREDIA, Susana. First record of ashgillian conodonts in the Argentine Precordillera. Ameghiniana [online]. 2008, vol.45, n.1, pp.59-68. ISSN 1851-8044.

A reworked conodont fauna from the Empozada Formation (Mendoza Precordillera) which belongs to the Caradoc-Ashgill (British Series from the Upper Ordovician) interval is reviewed. For the first time Amorphognathus cf. ordovicicus Branson & Mehl, 1933 is identified in Argentina. This species together with A. superbus, define the late Caradoc-earliest Ashgill of the Precordillera. The recovered conodont fauna is similar in composition with those of the British Province of the North Atlantic Realm, suggesting close relationships between both areas.

Keywords : Conodonts; Upper Ordovician; Precordillera; Empozada Formation; Medoza.