Resumo

HEREDIA, Susana  e  ROSALES, Carla. Conodont Biofacies of the Ponón Trehué Formation and its biostratigraphical importance as a type section for the Middle - Upper Oordovician of Cuyania (Argentina). Ser. correl. geol. [online]. 2006, vol.21, n.1, pp.7-16. ISSN 1666-9479.

The Ponón Trehué Formation (Mendoza Province, Argentina) is composed by a coarse clastic sequence transitionally followed by a fine dark carbonate sequence. The following conodont biozones can be recognized: Pygodus serra Zone with the Eoplacognathus robustus Subzone and the Eoplacognathus lindstroemi Subzone, and Pygodus anserinus Zone with the Sagittodontina kielcensis subzone and the Amorphognathus inaequalis subzone. Conodont population was studied and analysed, and several biofacies of the upper Middle Ordovician-lower Upper Ordovician conodonts from the Ponón Trehué Formation have been recorded. The significance of this section is pointed out as type locality for the Middle-Upper Ordovician boundary at Cuyania.

Palavras-chave : Ponón Trehué; Mendoza; Conodonts; Middle-Upper Ordovician biostratigraphy; Biofacies.

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