Middle Ordovician (early Dapingian) conodonts in the Central Andean Basin of NW Argentina

CARLOROSI, J., HEREDIA, S. AND ACEÑOLAZA, G.F.,

ALCHERINGA

TAYLOR & FRANCIS LTD

Lugar: Londres; Año: 2013 vol. 37 p. 1 - 13

0311-5518

.This paper describes and analyzes the significance of a conodont fauna from the Alto del Cóndor Formation, exposed in the Los Colorados regionof the Argentine Eastern Cordillera. Identified taxa are Baltoniodus triangularis, Baltoniodus sp. cf. B. triangularis, Drepanodus sp., Drepanoistodusbasiovalis, Drepanoistodus sp. B., Erraticodon patu, Gothodus costulatus, Oistodus sp., Trapezognathus diprion, T. quadrangulum, Triangulodussp. and Triangulodus? sp. The presence of Baltoniodus triangularis indicates the base of the Dapingian stage (Middle Ordovician). In addition,we report the coexistence of T. diprion and T. quadrangulum. The conodont association suggests a faunal affinity with Baltica and South China,both belonging to the Shallow-Sea Realm of the Temperate-Cold Domain