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Late Quaternary Climate and Vegetation of the Sudanian Zone of Northeast Nigeria

Published online by Cambridge University Press:  20 January 2017

Ulrich Salzmann ,
Philipp Hoelzmann  and
Irena Morczinek
Ulrich Salzmann*
Affiliation:
Seminar für Vor- und Frühgeschichte, Archäologie und Archäobotanik Afrikas, J. W. Goethe-Universität, Grüneburgplatz 1, 60323 Frankfurt am Main, [email protected]
Philipp Hoelzmann
Affiliation:
Max-Planck-Institut für Biogeochemie, PO Box 100164, 07701 Jena, Germany
Irena Morczinek
Affiliation:
Seminar für Vor- und Frühgeschichte, Archäologie und Archäobotanik Afrikas, J. W. Goethe-Universität, Grüneburgplatz 1, 60323 Frankfurt am Main, [email protected]
*
1To whom correspondence should be addressed.
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Abstract

The Lake Tilla crater lake in northeastern Nigeria (10°23′N, 12°08′E) provides a ca. 17,000 14C yr multiproxy record of the environmental history of a Sudanian savanna in West Africa. Evaluation of pollen, diatoms, and sedimentary geochemistry from cores suggests that dry climatic conditions prevailed throughout the late Pleistocene. Before the onset of the Holocene, the slow rise in lake levels was interrupted by a distinct dry event between ca. 10,900 and 10,500 14C yr B.P., which may coincide with the Younger Dryas episode. The onset of the Holocene is marked by an abrupt increase in lake levels and a subsequent spread of Guinean and Sudanian tree taxa into the open grass savanna that predominated throughout the Late Pleistocene. The dominance of the mountain olive Olea hochstetteri suggests cool climatic conditions prior to ca. 8600 14C yr B.P. The early to mid-Holocene humid period culminated between ca. 8500 and 7000 14C yr B.P. with the establishment of a dense Guinean savanna during high lake levels. Frequent fires were important in promoting the open character of the vegetation. The palynological and palaeolimnological data demonstrate that the humid period terminated after ca. 7000 14C yr B.P. in a gradual decline of the precipitation/evaporation ratio and was not interrupted by abrupt climatic events. The aridification trend intensified after ca. 3800 14C yr B.P. and continued until the present.

Keywords

palynologypalaeolimnologydiatomssedimentary geochemistrystable isotopesHolocenePleistocenesavannaNigeriaWest Africa
Type
Research Article
Information
Quaternary Research , Volume 58 , Issue 1 , July 2002 , pp. 73 - 83
Copyright
University of Washington

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