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New Geochemical Evidence for the Youngest Toba Tuff in India

Published online by Cambridge University Press:  20 January 2017

Phil Shane ,
John Westgate ,
Martin Williams  and
Ravi Korisettar
Phil Shane
Affiliation:
Department of Geology, University of Toronto, Toronto, Ontario M5S3B1, Canada
John Westgate
Affiliation:
Department of Geology, University of Toronto, Toronto, Ontario M5S3B1, Canada
Martin Williams
Affiliation:
Mawson Graduate Centre for Environmental Studies, University of Adelaide, Adelaide, SA 5005, Australia
Ravi Korisettar
Affiliation:
Department of History and Archaeology, Karnatak University, Dharwad 580 003, India
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Abstract

New geochemical data on tephra samples from a layer present at several archeological sites in India support correlation of this layer to the Youngest Toba Tuff, erupted from northern Sumatra about 74,000 yr ago. The data show that the Indian tephra layer is not a correlative of older tephra erupted from Toba, as has been suggested on the basis of artifact assemblages. Previously published geochemical data on the Indian tephra beds was based on bulk ash samples containing mineral and clay contaminants, and the resulting variability in analyses did not allow identification or discrimination of individual eruptive events. Our new data were collected on individual glass shards and small, purified glass separates which have greater resolving power in fingerprinting. Acheulian and Paleolithic artifacts found at some of the Indian tephra sites do not reflect the antiquity of the tephra bed, as they occur in fluvial sediments and may be reworked.

Type
Research Article
Information
Quaternary Research , Volume 44 , Issue 2 , September 1995 , pp. 200 - 204
Copyright
University of Washington

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