Talk:Toba catastrophe theory

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Conflicting estimations of occurance[edit]

The first sentence says "occurred some time between 69,000 and 77,000 years ago". Then, in the next section the time frame is given as "The Toba eruption or Toba event occurred .... about 75000±900 years Before Present (BP)".

± 4,000 or ± 900? — Preceding unsigned comment added by SteveOak (talkcontribs) 07:34, 11 December 2015 (UTC)

I have now changed the intro to reflect the discussion in the sections "Supereruption" and "Volcanic winter and cooling". The dating "some time between 69,000 and 77,000 years ago" is unnecessary imprecise when there is now a consensus that the event occurred about 75,000 years ago. --Florian Blaschke (talk) 19:47, 27 June 2016 (UTC)

References[edit]

the reference link http://toba.arch.ox.ac.uk/pub_files/Petraglia2007Science.pdf is host not found: Petraglia, M.; Korisettar, R.; Boivin, N.; Clarkson, C.; Ditchfield, P.; Jones, S.; Koshy, J.; Lahr, M.M.; Oppenheimer, C.; Pyle, D.; Roberts, R.; Schwenninger, J.-C.; Arnold, L.; White, K. (6 July 2007). "Middle Paleolithic Assemblages from the Indian Subcontinent Before and After the Toba Super-eruption" (PDF). Science. 317 (5834): 114–116. -- correct URL appears to be http://dx.doi.org/10.1126/science.1141564 Teledyn (talk) 16:21, 27 December 2016 (UTC)

Unused 'Sources'[edit]

25 of the 'Sources' are not linked from any reference in the text. Chiswick Chap (talk) 11:32, 4 November 2017 (UTC)

External links modified[edit]

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External links modified (January 2018)[edit]

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No volcanic winter in East Africa - UNIVERSITY OF ARIZONA 50.252.107.21 (talk) 04:41, 7 February 2018 (UTC)[edit]

No volcanic winter in East Africa from ancient Toba eruption The supereruption 74,000 years ago did not trigger major environmental disruption that caused human populations in East Africa to decline, say University of Arizona geoscientists. UNIVERSITY OF ARIZONA https://www.eurekalert.org/pub_releases/2018-02/uoa-nvw020618.php

This confirms previous studies, but may be worth adding to the citations once the journal article is available. Dudley Miles (talk) 09:50, 7 February 2018 (UTC)

In the section Volcanic winter and cooling computer models it says "The Toba eruption apparently coincided with the onset of the last glacial period." The last glacial period started 110,000 years ago. What some scientists are claiming is that Toba triggered the onset of glacial stage MIS4 (lasted about 14,000 years) or GS-20 (glacial stadial) which lasted over a thousand years. Neither of these theories are generally accepted because the evidence is inconclusive. Among other things, the annual layer count in the ice cores only goes back 60,000 years. Zyxwv99 (talk) 23:57, 17 February 2018 (UTC)

I have deleted the incorrect statements, but as the theory is now generally dismissed, the whole article needs re-writing by an expert. Dudley Miles (talk) 00:16, 18 February 2018 (UTC)
Right. Like the problematic Younger Dryas impact hypothesis. Zyxwv99 (talk) 00:28, 18 February 2018 (UTC)
That is even more dificult. If I understand correctly, versions of it still have significant, though minority, support. Dudley Miles (talk) 09:56, 18 February 2018 (UTC)