Global Volcanism Program | Image GVP-10095
Geologist Todd Housh observes dune-bedded pyroclastic-surge deposits in the wall of an abandoned quarry on the north flank of Hoya Estrada maar, directly west of the town of Valle de Santiago. Laminar and wave-bedded pyroclastic surge layers are visible at the bottom of the outcrop, and airfall layers occur at the top. Travel direction of the pyroclastic surges was from right to left.
Photo by Jim Luhr, 2002 (Smithsonian Institution).