| Journal: | Ameghiniana |
| Database: | PERIÓDICA |
| System number: | 000384239 |
| ISSN: | 0002-7014 |
| Authors: | Elgorriaga, Andrés1 Escapa, Ignacio H2 Bomfleur, Benjamín3 Cúneo, Rubén2 Ottone, Eduardo G4 |
| Institutions: | 1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires. Argentina 2Consejo Nacional de Investigaciones Científicas y Técnicas, Rawson, Chubut. Argentina 3Swedish Museum of Natural History, Department of Palaeobiology, Estocolmo. Suecia 4Universidad de Buenos Aires, Instituto de Estudios Andinos "Don Pablo Groeber", Buenos Aires. Argentina |
| Year: | 2015 |
| Volumen: | 52 |
| Number: | 1 |
| Pages: | 135-152 |
| Country: | Argentina |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | In order to reassess and amend previously published palynological data drawn from the Novo Remanso Formation, central Amazonia, we revisited the organic-rich samples from their work using systematic and quantitative biostratigraphic analyses, with possible implications in the biodiversity and paleoecological studies of Late Neogene deposits of Amazonia. In the study area, the Novo Remanso Formation is characterized by sandstones and mudstones deposited in a meandering river environment. The palynological assemblage comprises 46 morphotypes, including 21 species of pollen and 25 species of spores. Polypodiisporites usmensis, Retitrescolpites? irregularis and Mauritiidites franciscoi var. franciscoi, typical of lowland freshwater forests and shallow water lakes dominate the assemblage. Also, lower frequencies of Grimsdalea magnaclavata co-occur with Psilatricolporites crassoexinatus, Proteacidites triangulatus, Bombacacidites simpliciriloensis, Pteridaceoisporis gemmatus and Cingulatisporites laevigatus. Based on quantitative biostratigraphic techniques, the Novo Remanso Formation is assigned a middle Miocene–Pliocene age in our study area. The presence of Elaterosporites klaszii (Albian–Cenomanian) in the Novo Remanso deposits strongly indicates Cretaceous rocks in the source-area, whereas absence of Andine palynomorphs may be indicative of a nearby source area for the deposits during the deposition of the Novo Remanso Formation |
| Disciplines: | Biología |
| Keyword: | Botánica, Evolución y filogenia, Paleontología, Equisetales, Equisetum, Sistemática, Jurásico, Patagonia, Historia natural |
| Keyword: | Biology, Botany, Evolution and phylogeny, Paleontology, Equisetales, Equisetum, Systematics, Jurassic, Patagonia, Natural history |
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