The rounded ridge in the foreground is the tephra-mantled surface of a lava flow erupted from the base of the Rincón de Chapultepec scoria cone about 3,000 years ago. This 50-m-thick lobe was extruded for a distance of 2 km to the south on top of an earlier olivine-basaltic lava flow that filled the valley floor and traveled 6 km from the vent.

Photo by Lee Siebert, 2000 (Smithsonian Institution).

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

Keywords: lava flow | lava lobe

Naolinco Volcanic Field