Tambo Quemado. The eruption of 1808?
Héctor Sacristán, Volcano Chat, August, 2023
[www.volcanocafe.org]

The Massive Mystery Volcanic Eruption in 1808; Found in the Andes?
Geology Hub, Youtube Video
[www.youtube.com]

The paper is:

Guevara-Murua, A., Williams, C.A., Hendy, E.J., Rust, A.C. and
Cashman, K.V., 2014. Observations of a stratospheric aerosol veil
from a tropical volcanic eruption in December 1808: is this the
Unknown 1809 eruption?. Climate of the Past, 10(5), pp.1707-1722.
[cp.copernicus.org]

Yours,

Paul H.

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