Bio-magnetostratigraphy and environment of the oldest Eurasian hominoid from the Early Miocene of Engelswies (Germany)
| Autor: | Madelaine Böhme, Günter Schweigert, Hayfaa Abdul Aziz, Valerian Bachtadse, Jérôme Prieto |
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| Rok vydání: | 2011 |
| Předmět: |
010506 paleontology
Paleomagnetism Polarity (physics) Subtropics Environment 010502 geochemistry & geophysics Neogene 01 natural sciences Paleontology Germany Catarrhini Animals Foreland basin Phylogeny Ecology Evolution Behavior and Systematics Magnetostratigraphy 0105 earth and related environmental sciences Mammals Fossils Magnetic Phenomena Biological Evolution Molasse 13. Climate action Anthropology Biological dispersal Geology |
| Zdroj: | Journal of Human Evolution. 61:332-339 |
| ISSN: | 0047-2484 |
| Popis: | The paleobiogeography of hominoids exhibits a puzzling pattern of migrations between and within Africa and Eurasia. A precise dating of hominoid-bearing localities is therefore essential to reveal the timing, direction and possible causes of dispersals. Here, we present a bio-magnetostratigraphic analysis of the section of Engelswies (Southern Germany, Upper Freshwater Molasse, North Alpine Foreland Basin) where the oldest Eurasian hominoid was found. Our paleomagnetic results reveal a very short normal and a reverse magnetic polarity for the entire section. The polarity record is correlated to the Astronomical Tuned Neogene Time Scale using an integrated stratigraphic approach. This approach follows the chronostratigraphic framework for the Upper Freshwater Molasse, which combines magnetostratigraphy with biostratigraphic, lithostratigraphic and 40 Ar/ 39 Ar dating results. According to this outcome, the reverse polarity of the Engelswies section most likely correlates to magnetochron C5Cr. The origin of the short normal polarity remains enigmatic. The magnetostratigraphic calibration and the evolutionary level of the Engelswies small mammal fauna suggest an age of 17.1–17.0 Ma (Early Karpatian, Early Miocene) for the oldest Eurasian hominoid, and roughly confirm the estimates of Heizmann and Begun (2001) . The estimated age suggests that the first hominoids in Eurasia are contemporaneous with Afro-Arabian afropithecins, and dispersal may have been facilitated by intra-Burdigalian (∼18–17 Ma) sea-level low stands and the beginning of the Miocene Climate Optimum. The paleoclimatic and environmental reconstruction of the Engelswies locality indicates a lakeshore environment near dense subtropical rain forest vegetation, where paratropical temperatures (mean annual temperature around 20 °C) and humid conditions (mean annual precipitation > 1.100 mm) prevailed. |
| Databáze: | OpenAIRE |
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