pp. 147–160

5 páginas

En el presente trabajo se pasa revista a los hallazgos precedentes, y se avanza el descubrimiento de dos nuevas localidades con conodontos en el Ordovícico peruano. Hasta la fecha y desde el punto de vista estratigráfico, todos los yacimientos se ubican en la mitad inferior de la Formación San José (Floiense a Sandbiense) de la Cordillera Oriental, encontrándose en tratamiento muestras de nódulos calcáreos de la Formación Calapuja del Altiplano, que potencialmente vendrían a sumar los primeros datos sobre estos microfósiles en el Ordovícico Superior peruano.

Ordovician conodont faunas are poorly known from the northern part of the Central Andean Basin, in contrast with data from the northwest of Argentina and south of Bolivia, areas located in the southern part of the same basin. A single occurrence of late Floian conodonts of the upper Oepikodus evae Zone was reported in 2008 from the Carcel Puncco section (Inambari River valley) of southwestern Peru, close to the Subandean Fault. Further research in the Eastern Cordillera of Peru led to the discovery of three additional occurrences of Early to Middle Ordovician conodonts, also in the San José Formation but representative of different horizons. The first of them consists of an assemblage belonging to the Trapezognathus diprion–Baltoniodus cf. triangularis zones (late Floian), and was characterised in the Kimbiri section (Apurímac River valley). The remaining Abra de Yanacocha and Huanca...