The ordovician conodont trapezognathus lindstr?m, 1955 in the andean basin, Argentina

摘要

The Central Andean Basin is characterized by the presence of Ordovician deposits, distributed mainly in north-western Argentina. Conodonts from the Lower and Middle Ordovician were recovered from several outcrops of the Trapezognathus diprion, Baltoniodus cf. B. triangularis, and Baltoniodus triangularis biozones, and among them the genus Trapezognathus is highlighted. In this paper we describe and illustrate two species of this genus, T. diprion (lindsTr?M) and T. quadrangulum lindsTr?M. The conodont association suggests a faunal affinity with Baltica and South China.