Reconstructing habitats in central Amazonia using megafauna, sedimentology, radiocarbon, and isotope analyses
| Autor: | Heloisa Moraes-Santos, Antônio Emídio de Araújo Santos Jr., Peter Mann de Toledo, Dilce de Fátima Rossetti |
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| Rok vydání: | 2004 |
| Předmět: |
010506 paleontology
010504 meteorology & atmospheric sciences Paleozoic Pleistocene Climate change Context (language use) 01 natural sciences law.invention Paleontology Basement (geology) Arts and Humanities (miscellaneous) law Megafauna General Earth and Planetary Sciences Radiocarbon dating Sedimentology Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Quaternary Research. 61:289-300 |
| ISSN: | 1096-0287 0033-5894 |
| DOI: | 10.1016/j.yqres.2004.02.010 |
| Popis: | A paleomegafauna site from central Amazonia with exceptional preservation of mastodons and ground sloths allows for the first time a precise age control based on14C analysis, which, together with sedimentological and δ13C isotope data, provided the basis to discuss habitat evolution within the context of climate change during the past 15,000 yr. The fossil-bearing deposits, trapped within a depression in the Paleozoic basement, record three episodes of sedimentation formed on floodplains, with an intermediate unit recording a catastrophic deposition through debris flows, probably favored during fast floodings. The integrated approach presented herein supports a change in humidity in central Amazonia through the past 15,000 yr, with a shift from drier to arboreal savanna at 11,340 (±50)14C yr B.P. and then to a dense forest like we see today at 4620 (±60)14C yr B.P. |
| Databáze: | OpenAIRE |
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