Abstract
An imposing chain of volcanoes that forms a narrow belt parallel to the Pacific coast of Guatemala displays a variety of petrologic and eruptive features that appear to be related to differences in their structural environment. In western Guatemala most of the volcanoes are large composite cones of pyroxene andesite that bear only a few parasitic cones of basaltic cinders on their flanks. However, many of the volcanoes, during their later stages of growth, discharged immense volumes of dacite pumice from their summit vents, and some of them erupted domes of viscous andesite and more siliceous lavas far down their slopes. The huge cauldron of Lake Atitlan and the Krakatoan-type caldera of Lake Ayarza were formed by subsidence related to voluminous eruptions of lava and pumice.
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