Volcanic activity began in the Lake Atitlan area about 11-12 million years ago. The present-day stratovolcanoes and caldera represent the most recent of four periods of volcano growth and caldera collapse. This recent period of activity began about 1.8 million years ago. A large explosive eruption about 84,000 years ago formed the most recent Atitlan caldera. Lake Atitlan fills part of the caldera.
More images of Atitlan
Mooser, F., Meyer-Abich, H., and McBirney, A.R., 1958, Central America: Catalog of Active Volcanoes of the World: Rome, IAVCEI, 6, p. 1-146.
Newhall, C.G., 1987, Geology of the Lake Atitlan region, western Guatemala: Journal of Volcanology and Geothermal Research, v. 33, p. 23-55.
Newhall, C.G., 1981, Geology of the Lake Atitlan area, Guatemala: a study in subduction zone volcanism and caldera formation: M.S. thesis, Dartmouth College, Hanover, New Hampshire.
Rose, W.I., Penfield, G.T., Drexler, J.W., and Larson, P.B., 1980, Geochemistry of the andesite flank lavas of three composite cones within the Atitlan Cauldron, Guatemala: Bulletin of Volcanology, v. 43, p. 133-154.
Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.
Images of Volcanoes To VolcanoWorld