Reconstruction of a semi-arid late Pleistocene paleocatena from the Lake Victoria region, Kenya

Beverly, Emily J., Driese, Steven G., Peppe, Daniel J., Arellano, L. Nicole, Blegen, Nick, Faith, J. Tyler and Tryon, Christian A. (2015) Reconstruction of a semi-arid late Pleistocene paleocatena from the Lake Victoria region, Kenya. Quaternary Research, 84 3: 368-381. doi:10.1016/j.yqres.2015.08.002


Author Beverly, Emily J.
Driese, Steven G.
Peppe, Daniel J.
Arellano, L. Nicole
Blegen, Nick
Faith, J. Tyler
Tryon, Christian A.
Title Reconstruction of a semi-arid late Pleistocene paleocatena from the Lake Victoria region, Kenya
Journal name Quaternary Research   Check publisher's open access policy
ISSN 0033-5894
1096-0287
Publication date 2015-11-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.yqres.2015.08.002
Open Access Status Not Open Access
Volume 84
Issue 3
Start page 368
End page 381
Total pages 14
Place of publication Maryland Heights, MO United States
Publisher Academic Press
Collection year 2016
Language eng
Formatted abstract
The effect of changing environment on the evolution of Homo sapiens is heavily debated, but few data are available from equatorial Africa prior to the last glacial maximum. The Karungu deposits on the northeast coast of Lake Victoria are ideal for paleoenvironmental reconstructions and are best studied at the Kisaaka site near Karunga in Kenya (94 to > 33 ka) where paleosols, fluvial deposits, tufa, and volcaniclastic deposits (tuffs) are exposed over a ~ 2 km transect. Three well-exposed and laterally continuous paleosols with intercalated tuffs allow for reconstruction of a succession of paleocatenas. The oldest paleosol is a smectitic paleo-Vertisol with saline and sodic properties. Higher in the section, the paleosols are tuffaceous paleo-Inceptisols with Alfisol-like soil characteristics (illuviated clay). Mean annual precipitation (MAP) proxies indicate little change through time, with an average of 764 ± 108 mm yr− 1 for Vertisols (CALMAG) and 813 ± 182 to 963 ± 182 mm yr− 1 for all paleosols (CIA-K). Field observations and MAP proxies suggest that Karungu was significantly drier than today, consistent with the associated faunal assemblage, and likely resulted in a significantly smaller Lake Victoria during the late Pleistocene. Rainfall reduction and associated grassland expansion may have facilitated human and faunal dispersals across equatorial East Africa.
Keyword Paleosols
Paleoenvironment
Karungu
Semi-arid
Paleoclimate
Human evolution
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Social Science Publications
 
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Created: Tue, 15 Dec 2015, 18:33:31 EST by Tyler Faith on behalf of School of Social Science