Preliminary results from sediment cores from Lake Bosumtwi, Ghana.

M. R. Talbot

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Results are presented from the analysis of three sediment cores from Lake Bosumtwi using mineralogy, sedimentology, palynology and grass cuticle content. The longest core is 16.9 m long and spans approximately the last 27 500 yr of the lake's history. The oldest part of the sequence, from c.27 500 to 24 500 BP, is poorly understood, but seems to contain evidence of both high and low water levels. Between 23 000 and 19 500 BP the lake water was relatively dilute, but became more saline and alkaline between 19 000 and 16 000 BP when the lake level must have been low. Regressions of the lake are registered just before 13 500 BP, at c.3750 BP and after 2000 BP. Maximum lake level seems to have occurred between 9000 and 4000 BP. Grass cuticle fragments are prominent in sediments deposited before c.9000 BP, confirming the pollen evidence that grassland formerly existed around the Bosumtwi crater. -from Authors

Original languageEnglish (US)
Pages (from-to)173-192
Number of pages20
JournalPalaeoecology of Africa
StatePublished - 1984

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