Los Chocoyos eruption

The Los Chocoyos eruption was a supervolcanic eruption that occurred sometime between 98,000 and 75,000 years ago, with the younger estimate placing the age close to the Youngest Toba eruption. The eruption consisted of approximately of rhyolitic ash, with a dense-rock equivalent of about. The eruption is the largest known eruption in Central America and the third, and most recent, caldera forming eruption at Atitlan, with two others known at around 11 mya and 8 mya.
The eruption resulted in voluminous pyroclastic density currents, leaving deposits thick in Chiapas, over from the source. Ash deposits were found over an area of. It has been previously postulated that the eruption caused a millenial-scale volcanic winter, although new evidence suggests that is not the case.