The Las Derrumbadas lava domes rise above the rim of the San Luis Atexcac maar. The two rhyolite lava domes rise about 1 km above their bases. The NW dome (right) consists of a microcrystalline rhyolite that has been extensively altered by fumarolic activity. The SE dome (left) is of similar lithology. The carapace of both domes has been removed by a series of slope failures. The San Luis Atexcac maar in the foreground erupted through Cretaceous limestones and Tertiary monzonites and hornfels.

Photo by Lee Siebert, 1998 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Keywords: maar | crater | lava dome

Serdán-Oriental