Global Volcanism Program | Image GVP-10001
The summit tephra cone and lava dome complex of Cerro Evermann is viewed here from the SE flank. Obsidian lava domes and flows of soda rhyolitic and trachytic composition have filled most of the summit craters. Cerro Evermann lies within a 4.5 x 3.8-km-wide Pleistocene caldera that formed about 370,000 years ago and has been largely filled by post-caldera eruptions. The caldera rim is exposed at about 600 m elevation on the south and east sides of Cerro Evermann, where it forms a low, steep scarp 20-50 m high.
Photo by Martha Marin, 1998 (Mexican Navy).