Universität zu Köln

Trauth, Martin H., Bergner, Andreas G. N., Foerster, Verena, Junginger, Annett ORCID: 0000-0003-3486-0888, Maslin, Mark A. and Schaebitz, Frank (2015). Episodes of environmental stability versus instability in Late Cenozoic lake records of Eastern Africa. J. Hum. Evol., 87. S. 21 - 32. LONDON: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD. ISSN 0047-2484

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Abstract

Episodes of environmental stability and instability may be equally important for African hominin speciation, dispersal, and cultural innovation. Three examples of a change from stable to unstable environmental conditions are presented on three different time scales: (1) the Mid Holocene (MH) wet dry transition in the Chew Bahir basin (Southern Ethiopian Rift; between 11 ka and 4 ka), (2) the MIS 5-4 transition in the Naivasha basin (Central Kenya Rift; between 160 ka and 50 ka), and (3) the Early Mid Pleistocene Transition (EMPT) in the Olorgesailie basin (Southern Kenya Rift; between 1.25 Ma and 0.4 Ma). A probabilistic age modeling technique is used to determine the timing of these transitions, taking into account possible abrupt changes in the sedimentation rate including episodes of no deposition (hiatuses). Interestingly, the stable-unstable conditions identified in the three records are always associated with an orbitally-induced decrease of insolation: the descending portion of the 800 kyr cycle during the EMPT, declining eccentricity after the 115 ka maximum at the MIS 5-4 transition, and after similar to 10 ka. This observation contributes to an evidence-based discussion of the possible mechanisms causing the switching between environmental stability and instability in Eastern Africa at three different orbital time scales (10,000 to 1,000,000 years) during the Cenozoic. This in turn may lead to great insights into the environmental changes occurring at the same time as hominin speciation, brain expansion, dispersal out of Africa, and cultural innovations and may provide key evidence to build new hypotheses regarding the causes of early human evolution. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Trauth, Martin H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bergner, Andreas G. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Foerster, Verena UNSPECIFIED UNSPECIFIED UNSPECIFIED Junginger, Annett UNSPECIFIED orcid.org/0000-0003-3486-0888 UNSPECIFIED Maslin, Mark A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaebitz, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-392111
DOI:	10.1016/j.jhevol.2015.03.011
Journal or Publication Title:	J. Hum. Evol.
Volume:	87
Page Range:	S. 21 - 32
Date:	2015
Publisher:	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Place of Publication:	LONDON
ISSN:	0047-2484
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PLEISTOCENE OLORGESAILIE FORMATION; KENYA RIFT; CLIMATE-CHANGE; FOOD-PRODUCTION; HUMID PERIOD; EVOLUTION; AGE; INSOLATION; SUGUTA; MODELS Multiple languages Anthropology; Evolutionary Biology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39211