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 geoscientists.
University of Arizona, February 6, 2018
[www.sciencedaily.com]
[uanews.arizona.edu]

The paper is:

Chad L. Yost, Lily J. Jackson, Jeffery R. Stone, Andrew S.
Cohen. Subdecadal phytolith and charcoal records from
Lake Malawi, East Africa imply minimal effects on human
evolution from the about 74 ka Toba supereruption. Journal of
Human Evolution, 2018; 116: 75 DOI: 10.1016/j.jhevol.2017.11.005
[www.researchgate.net]
[www.geo.arizona.edu]
[www.sciencedirect.com]

Also, there is:

Modern humans flourished through ancient supervolcano
eruption 74,000 years ago. University of Cape Town, March 12, 2018
[www.sciencedaily.com]
[www.bbc.com]

The paper is:

Eugene I. Smith, Zenobia Jacobs, Racheal Johnsen, Minghua
Ren, Erich C. Fisher, Simen Oestmo, Jayne Wilkins, Jacob A.
Harris, Panagiotis Karkanas, Shelby Fitch, Amber Ciravolo,
Deborah Keenan, Naomi Cleghorn, Christine S. Lane,
Thalassa Matthews, Curtis W. Marean. Humans thrived
in South Africa through the Toba eruption about 74,000
years ago. Nature, 2018; DOI: 10.1038/nature25967
[digitalscholarship.unlv.edu]
[www.nature.com]

Yours,

Paul H.

"The past is never dead. It's not even past."
William Faulkner, Act 1, Scene III, Requiem for a Nun (1951)