Megaflora (woods, culms, and palms) from the Ituzaingó Formation, Paraná river basin, Argentina
The Ituzaingó Formation is a fluvial deposit of the Argentine Littoral region with a important palaeobotanical record. This work synthesizes current knowledge of its permineralized megaflora, including woods, culms, and palms, with emphasis on the taxonomic diversity and its palaeoenviromental and b...
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| Autores principales: | , , , |
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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Facultad de Ciencias Exactas y Naturales y Agrimensura
2025
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| Acceso en línea: | https://revistas.unne.edu.ar/index.php/fce/article/view/8827 |
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| Sumario: | The Ituzaingó Formation is a fluvial deposit of the Argentine Littoral region with a important palaeobotanical record. This work synthesizes current knowledge of its permineralized megaflora, including woods, culms, and palms, with emphasis on the taxonomic diversity and its palaeoenviromental and biogeographic context. This geological unit has been studied since the XIX century and has provided key fossils for palaeoecological and palaeoclimatic reconstructions. There are 73 fossil specimens assigned to 13 families, with the Anacardiaceae, Fabaceae, Moraceae, Lauraceae and Proteaceae being the most frequent. The fossil woods come from the provinces of Entre Ríos, Corrientes and Santa Fe. In Entre Ríos, specimens are preserved by silicification, whereas those from Corrientes and Santa Fe are mainly preserved with amorphous hydroxyls of Fe and Ca and other trace elements, wich affected the anatomical features and complicated taxonomic identification. The anatomical studies of these fossil woods indicate the coexistence of species adapted to different hydric regimes, from riparian humid forest to seasonally dry forest. These data support the hypothesis that Neotropical Seasonally Dry Forests had a wider distribution in South America in the past. Future research, incorporating new radiometric dating and detailed sedimentological analyses will help refine the chronological and environmental context of these deposits. Additionally, interdisciplinary approaches that integrate traditional taxonomy with paleoecological, paleoclimatic, and paleoenvironmental studies will contribute to a deeper understanding of these ecosystems and their evolution in response to climatic changes during the Late Cenozoic. |
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