Journal
QUATERNARY SCIENCE REVIEWS
Volume 30, Issue 27-28, Pages 3925-3934Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2011.10.008
Keywords
Toba; Son Valley; Tephra; Fluvial geomorphology
Funding
- Dudley Stamp Memorial Award
- Cambridge-India Partnership
- SMUTS Memorial Fund
- Department of Geography, University of Cambridge
- Leverhulme Trust
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Investigation of the climatic and environmental impacts of the Youngest Toba Tuff (YTT, similar to 74 ka BP) eruption of Toba volcano, Sumatra, is crucial for understanding the consequences of the eruption for contemporaneous human populations. The Middle Son Valley, in India, was the first locality on the Indian subcontinent where the YTT was reported. The ash bed forms a discontinuous layer stretching for over 30 km along the river. Here we report on the stratigraphic contexts of YTT ash layers in alluvial deposits of the Middle Son Valley, in order to reconstruct the taphonomy of the ash deposits and the dynamic of their deposition. Although the distal ash has been studied since the 1980s, its stratigraphic integrity and the mechanisms and pathways involved in its transport and deposition have bit previously been assessed. We find that the YTT occurrences in the Middle Son Valley may not be reliable chronostratigraphical markers for millennial scale palaeoenvironmental reconstruction. (C) 2011 Elsevier Ltd. All rights reserved.
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