All Toba Tephra Occurrences across
Peninsular India Belong to the 75,000 Yr B.P. Eruption
According to the authors1 the number of eruptions of Mt
Toba in Indonesia that are recorded in the occurrences of tephra across
peninsula India are being debated. There are some claiming that all the
tephra layers found are from a single event at 75,000 BP, though others
claim that tephra from earlier eruptions of Toba are also present as
suggested by dating and archaeological evidence In this paper the
authors1 report their attempt to resolve this issue by
geochemical analyses of a comprehensive suite of samples, that allows
the comparisons of the samples from India to those taken from the Mt
Toba caldera in the north of Sumatra in Indonesia, Malaysia, and
importantly, the sedimentary cores obtained at the ODP Site 758 in the
Indian Ocean, which
contains several of tephra beds from earlier Toba eruptions. Also, the
fission-track method was used to date 2 tephra samples from western
India. It is demonstrated unequivocally by the results that all the
tephra deposits from Toba that are known of in peninsula India are from
the Toba eruption of 75,000 BP. Therefore this tephra bed can be used as
an effective tool to correlate the dating of sedimentary sequences from
the Late Quaternary across India and not in support of the Middle
age for associated Acheulian artefacts.
Sources & Further
- Westgate, John A., Philip A. R. Shane, Nicholas J. G. Pearce,
William T. Perkins, Ravi Korisettar, Craig A. Chesner, Martin A. J.
Williams, and Subhrangsu K. Acharyya. "All Toba Tephra Occurrences
across Peninsular India Belong to the 75,000 Yr B.P. Eruption."
Quaternary Research 50, no. 1 (7// 1998): 107-12.