Abstract
In this paper, we present and discuss pollen data from the Early Pleistocene (1.8 to 1.6 Ma) – we use the revised timescale approved by IUGS, in which the base of the Pleistocene is defined by the GSSP of the Gelasian Stage at 2.588 (2.6) Ma (Gibbard et al. 2010) – and from the Mid-Pleistocene Transition (0.9 to 0.6 Ma) at Melka Kunture (Upper Awash , Ethiopia). At 2000 m asl in the Ethiopian highlands, these deposits yield many rich and successive archaeological sites, notably documenting the late Oldowan, the emergence of the Acheulean and the middle Acheulean. The stratigraphic position of the fifteen pollen samples is checked by 40Ar/39Ar dating and by geological investigation. Furthermore, they are now correlated to archaeological layers whose excavated lithic industries have been reinterpreted. Our study shows that mountain forest trees belonging to the present-day Afromontane complex were already established in Ethiopia at ~1.8 Ma and that the knappers of the Oldowan and early Acheulean could cope with mountain climatic conditions that had a large diurnal temperature range. Moreover, the new interpretation of pollen results emphasizes changes that occurred in the vegetation cover at 200- or 300-thousand-year snapshot intervals, one during the Early Pleistocene and another one later on, during the Mid-Pleistocene Transition . These changes concerned plant species and their respective abundance and appear to have been related to rainfall and temperature variability . The proportion of forest trees increased during wet episodes, whereas the influence of Afroalpine grassland indicators increased during cool and dry episodes. Variations in Early Pleistocene pollen data from Melka Kunture at ~1.8–1.6 Ma are consistent with isotopic evidence of precession variability as recorded at Olduvai and Turkana archaeological sites at ~2–1.8 Ma. For the Mid-Pleistocene Transition , variations in pollen data seem to match the climatic variability of isotopic and long pollen records from the Mediterranean region, notably upon the onset of dominant 100 ka-long glacial/interglacial cycles.
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Acknowledgements
The recent research at Melka Kunture was supported by grants from Sapienza Università di Roma (“Grandi scavi archeologici”) and from the Italian Foreign Ministry awarded to MM. We thank the Authority for Research & Conservation of Cultural Heritage of the Ministry of Culture & Tourism, the National Museum of Addis Ababa, and the Oromia Culture and Tourism Bureau for permits for fieldwork and access to the lithic collections. RB did the paleobotanical analysis and reexamined the environmental interpretation, RTM established the stratigraphic sequence and MM designed, encouraged and coordinated the project. The late Nicole Chavaillon and her daughters generously entrusted Jean Chavaillon’s archives to MM. We thank Guillaume Jouve (CEREGE) et Morteza Djamali (IMBE) for their help in drawing the pollen diagrams. Rosalia Gallotti participated in the discussion with the three authors. Flavio Altamura provided important information related to the stratigraphic position of samples Gomb173 and Gomb349.
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Bonnefille, R., Melis, R.T., Mussi, M. (2018). Variability in the Mountain Environment at Melka Kunture Archaeological Site, Ethiopia, During the Early Pleistocene (~1.7 Ma) and the Mid-Pleistocene Transition (0.9–0.6 Ma). In: Gallotti, R., Mussi, M. (eds) The Emergence of the Acheulean in East Africa and Beyond. Vertebrate Paleobiology and Paleoanthropology. Springer, Cham. https://doi.org/10.1007/978-3-319-75985-2_5
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