Late Pleistocene and Holocene lake level fluctuations in the Lake Bogoria bassin, northern Kenya Rift Valley in Palaeoecology of Africa and the surrounding islands-Vol 13.

Auteurs :
TIERCELIN, J. J.
RENAUT, R. W.
DELIBRIAS, G.
LE FOURNIER, J.
BIEDA, S.
COETZEE, J. A.
VAN ZINDEREN BAKKER, E. M. Sr

Description :
Lake Bogoria is a closed-basin, saline alkaline lake in the Kenya Rift Valley. The sedimentology and mineralogy of three long drill-cores from the lake floor, and the marginal fluvio-deltaic and littoral deposite are studied here. During the late Pleistocene, the lake fluctuated but was mostly low and saline (anoxic)| calcrete, dolocrete and pedogenic zeolites developed in marginal soils. Following this dry phase, a regional increase in humidity during the terminal Pleistocene and early Holocene, led to a marked rise in lake level. The lake waters were considerably fresher than today allowing expansion of both fauna and flora, and may periodically have overflowed northwards into the Baringo sub-basin. Further fluctuations occured throughout the Holocene. A major late Holocene transgression, dated at c. 4000 BP is recorded by high level, stromatolitic limestone crusts.


Type de document :
Monographie

Source :
, p. 105-120, Références bibliographiques : 37 réf.

Date :
1981

Identifiants :
isbn : 90-6191-203-2

Editeur :
Pays édition : Pays-Bas, Rotterdam, A. A. Balkema