CONICET | Buscador de Institutos y Recursos Humanos

This work is aimed at the analysis of the paleovegetation, paleoclimates and paleooceanography of the Paleogene of the Río Foyel section (El Foyel Group), Ñirihuau Basin, Argentina. It comprises Troncoso, Salto del Macho and Río Foyel formations. Sporomorphs analysis reflects a regional forest dominated by Nothofagaceae, Myrtaceae, Podocarpaceae and Palmae, developed under a temperate to warm-temperate and humid climate. In the studied section, the relation between terrestrial/marine palynomorphs is considered. In Troncoso Formation, terrigenous palynomorphs dominate over marine elements. The recurrent presence of gymnosperm pollen with Araucariaceae indicates temperate to humid conditions. Salto del Macho Formation shows a retraction of the gymnosperm forest, associated with the dominance of the forest of Nothofagus, indicating a temperate-humid condition. In the Río Foyel Formation, the sporomorphs indicate the presence of a temperate to warm-humid forest with subordinate open areas and a remarkable input from the coastal environment. In the same formation, the palynological characteristics, which indicate upward shallowing, allow the identification of parasequences. The bounding surfaces of parasequences are defined as surfaces of flooding which represent a relative sea level rise (marine flooding surfaces). The Río Foyel Formation shows an upward shallowing sequence, indicated by the decrease of dinocysts. Different marine flooding surfaces were detected, associated with the diversity and abundance of dinocyst. A comparison of these sporepollen assemblages with others from Patagonia, using multivariate statistic techniques, yields strong similarities between Troncoso Formation (?Late Eocene) and Slogett Formation (Late Eocene-?Early Oligocene); and between Salto del Macho and Río Foyel formations with Oligocene assemblages from Patagonia. Formation, the sporomorphs indicate the presence of a temperate to warm-humid forest with subordinate open areas and a remarkable input from the coastal environment. In the same formation, the palynological characteristics, which indicate upward shallowing, allow the identification of parasequences. The bounding surfaces of parasequences are defined as surfaces of flooding which represent a relative sea level rise (marine flooding surfaces). The Río Foyel Formation shows an upward shallowing sequence, indicated by the decrease of dinocysts. Different marine flooding surfaces were detected, associated with the diversity and abundance of dinocyst. A comparison of these sporepollen assemblages with others from Patagonia, using multivariate statistic techniques, yields strong similarities between Troncoso Formation (?Late Eocene) and Slogett Formation (Late Eocene-?Early Oligocene); and between Salto del Macho and Río Foyel formations with Oligocene assemblages from Patagonia. Formation, the sporomorphs indicate the presence of a temperate to warm-humid forest with subordinate open areas and a remarkable input from the coastal environment. In the same formation, the palynological characteristics, which indicate upward shallowing, allow the identification of parasequences. The bounding surfaces of parasequences are defined as surfaces of flooding which represent a relative sea level rise (marine flooding surfaces). The Río Foyel Formation shows an upward shallowing sequence, indicated by the decrease of dinocysts. Different marine flooding surfaces were detected, associated with the diversity and abundance of dinocyst. A comparison of these sporepollen assemblages with others from Patagonia, using multivariate statistic techniques, yields strong similarities between Troncoso Formation (?Late Eocene) and Slogett Formation (Late Eocene-?Early Oligocene); and between Salto del Macho and Río Foyel formations with Oligocene assemblages from Patagonia. Formation, the sporomorphs indicate the presence of a temperate to warm-humid forest with subordinate open areas and a remarkable input from the coastal environment. In the same formation, the palynological characteristics, which indicate upward shallowing, allow the identification of parasequences. The bounding surfaces of parasequences are defined as surfaces of flooding which represent a relative sea level rise (marine flooding surfaces). The Río Foyel Formation shows an upward shallowing sequence, indicated by the decrease of dinocysts. Different marine flooding surfaces were detected, associated with the diversity and abundance of dinocyst. A comparison of these sporepollen assemblages with others from Patagonia, using multivariate statistic techniques, yields strong similarities between Troncoso Formation (?Late Eocene) and Slogett Formation (Late Eocene-?Early Oligocene); and between Salto del Macho and Río Foyel formations with Oligocene assemblages from Patagonia. Nothofagus, indicating a temperate-humid condition. In the Río Foyel Formation, the sporomorphs indicate the presence of a temperate to warm-humid forest with subordinate open areas and a remarkable input from the coastal environment. In the same formation, the palynological characteristics, which indicate upward shallowing, allow the identification of parasequences. The bounding surfaces of parasequences are defined as surfaces of flooding which represent a relative sea level rise (marine flooding surfaces). The Río Foyel Formation shows an upward shallowing sequence, indicated by the decrease of dinocysts. Different marine flooding surfaces were detected, associated with the diversity and abundance of dinocyst. A comparison of these sporepollen assemblages with others from Patagonia, using multivariate statistic techniques, yields strong similarities between Troncoso Formation (?Late Eocene) and Slogett Formation (Late Eocene-?Early Oligocene); and between Salto del Macho and Río Foyel formations with Oligocene assemblages from Patagonia.