PALYNOLOGY AND PALYNOFACIES OF THE RÍO TARDE FORMATION (LOWER CRETACEOUS), SOUTHERN PATAGONIA, ARGENTINA
DOI:
https://doi.org/10.5710/AMGH.25.08.2025.3644Keywords:
Palynology, Palynofacies, Paleoclimate, Paleoenvironment, Santa CruzAbstract
This work presents the first palynological and palynofacies analysis of the Río Tarde Formation (Aptian–Albian) from the Parque Nacional Perito Moreno, Santa Cruz Province, Argentina. Four samples from the lower member of the unit were analyzed, revealing a
palynological assemblage composed of thirteen species. Nine of these correspond to ferns from the families Anemiaceae, Cyatheaceae, Gleicheniaceae, Lygodiaceae, and Schizaeaceae; three are gymnosperms assigned to the families Araucariaceae, Hirmeriellaceae, and Podocarpaceae; and one species represents a freshwater alga of the genus Botryococcus. The recovered association of palynomorphs allows us to infer temperate to warm and relatively humid paleoclimatic conditions. The palynological organic matter, dominated by dark brown to black translucent phytoclasts, suggests a significant contribution of continental material from macrophyte remains, consistent with a fluvial depositional environment.
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