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LA MÉKROU (NIGER S.O.), UNE RIVIÈRE JEUNE

LA MÉKROU (NIGER S.O.), UNE RIVIÈRE JEUNE A right bank tributary of the Niger River, the Mekrou, has formed a strongly incised river bed within clayey to sandy alluvium, locally interrupted by thin layers of gravel and coarser deposits. The alluvia give evidence to different climatic conditions: finer material was accumulated during flooding within a humid period, whereas the arid times seem to be reflected by coarser sediments. The cyclic facies change of sedimentation gives evidence for a repeated shilft in climate and hydrologic conditions, assuming that the alluvia originate in the upper Pleistocene. Some human artefacts are associated to the different gravel layers (subjacent bed = Palaeolithic, intermediate bed = middle Palaeolithic, overlying bed = ‘‘recent’’ Palaeolithic, Neolithic, and iron Metallurgy). The absence of terraces, the occurrence of sandy sediments on the border of the river bed indicates to active morphodynamic processes; some angularly shaped meanders give evidence for a rapid change of drainage and leads to the hypothesis of a modified flow-off by the river’’s recent capture. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of African Archaeology Brill

LA MÉKROU (NIGER S.O.), UNE RIVIÈRE JEUNE

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Publisher
Brill
Copyright
© Copyright 2005 by Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1612-1651
eISSN
2191-5784
DOI
10.3213/1612-1651-10055
Publisher site
See Article on Publisher Site

Abstract

A right bank tributary of the Niger River, the Mekrou, has formed a strongly incised river bed within clayey to sandy alluvium, locally interrupted by thin layers of gravel and coarser deposits. The alluvia give evidence to different climatic conditions: finer material was accumulated during flooding within a humid period, whereas the arid times seem to be reflected by coarser sediments. The cyclic facies change of sedimentation gives evidence for a repeated shilft in climate and hydrologic conditions, assuming that the alluvia originate in the upper Pleistocene. Some human artefacts are associated to the different gravel layers (subjacent bed = Palaeolithic, intermediate bed = middle Palaeolithic, overlying bed = ‘‘recent’’ Palaeolithic, Neolithic, and iron Metallurgy). The absence of terraces, the occurrence of sandy sediments on the border of the river bed indicates to active morphodynamic processes; some angularly shaped meanders give evidence for a rapid change of drainage and leads to the hypothesis of a modified flow-off by the river’’s recent capture.

Journal

Journal of African ArchaeologyBrill

Published: Oct 25, 2005

Keywords: Mékrou; rivière; Paléolithique; Néolithique; Pléistocène

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