FIRST TITHONIAN RECORD OF PERFORATED PEDIASTRUM S.L. SPECIES WITHIN EARLY-DIAGENETIC CARBONATE CONCRETIONS FROM THE VACA MUERTA FORMATION, NEUQUÉN BASIN, ARGENTINA. IMPLICATIONS FOR THE PALYNOLOGICAL ANALYSIS OF FINE-GRAINED ROCKS

OLIVERA, DANIELA E.; MARTÍNEZ, MARCELO A.; OTHARÁN, GERMÁN; AGÜERO, LUIS; ZAVALA, C.A.

PUBLICACIÓN ELECTRÓNICA DE LA ASOCIACIÓN PALEONTOLÓGICA ARGENTINA (PE-APA)

Asociación Paleontológica Argentina

Lugar: Buenos Aires; Año: 2023

2469-0228

The perforated Pediastrum s.l. species are recorded for the first time in the basal levels of the Tithonian Vaca Muerta Formation, extending its first stratigraphical record to ages as older as Late Jurassic times. Based on the ecological requirements of Pediastrum simplex var. clathratum and P. simplex var. biwaense the previously warm paleoclimatic conditions suggested by the Late Jurassic of Neuquén Basin, are reinforced. The good preservation of this material is interpreted as the co-occurrence of different mechanisms that interacted during the transport, accumulation and early diagenesis of these sediments and their organic content.