A new late Pleistocene-Holocene water-level curve for Lake Bosumtwi, Ghana

Physics

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Scientific paper

Field data, supported by 28 14C dates, show that during the late Pleistocene Lake Bosumtwi suffered a major regression and probably remained low for some time, the exposed lacustrine sediments undergoing considerable pedogenesis. Just after 13,000 B.P. the lake was rising again, and thereafter the crater has generally been characterised by a lake significantly higher than it is at present. These periods of high water level, of 2000-2500 years duration, were interrupted by short, but intense regressions centred around 10,500, 8000, 4000-4500 and just after 1000 years B.P. During the highstands the local climate is likely to have been broadly similar to today; the nature of the climatic changes responsible for the regressions is not known with any certainty.

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