Global Volcanism Program | Image GVP-10096
The steep-sided walls of a quarry on the SW flank of Hoya Estrada maar in the Valle de Santiago volcanic field show a spectacular sequence of deposits from the maar-forming eruptions in this view looking ENE in the direction of the vent. Most of the outcrop consists of gray-colored dominantly planar pyroclastic-surge beds. The three prominent light-colored layers are airfall deposits. The largest airfall layer just above the middle of the outcrop is about 2 m thick.
Photo by Jim Luhr, 2002 (Smithsonian Institution).