Biofacies de Conodontes de la Formación Ponón Trehué y la importancia bioestratigráfica como sección tipo para el límite del Ordovícico Medio-Ordovícico Superior de Cuyania (Argentina)
2006; Instituto Superior de Correlación Geológica; Volume: 21; Issue: 1 Linguagem: Inglês
ISSN
1666-9479
AutoresSusana Heredia, Carla Daniela Rosales,
Tópico(s)Hydrocarbon exploration and reservoir analysis
ResumoCONODONT BIOFACIES OF THE PONON TREHUE FORMATION AND ITS BIOSTRATIGRAPHICAL IMPORTANCE AS A TYPE SECTION FOR THE MIDDLE - U PPER ORDOVICIAN OF CUYANIA (ARGENTINA). The Ponon Trehue 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 Ponon Trehue Formation have been recorded. The significance of this section is pointed out as type locality for the Middle-Upper Ordovician boundary at Cuyania.
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