Thick units of the 84,000-year-old Los Chocoyos Ash are exposed south of Guatemala City, more than 100 km from its source at Atitlán caldera. Three units are visible here. The pinkish unit across the center of is the oxidized top of the pyroclastic flow deposit. The bottom two white units are the top and bottom halves of the deposit. The two fall deposits above the Los Chocoyos Ash are unit E from Amatitlán caldera and the younger unit C from Volcán de Agua.

Photo by Bill Rose, 1978 (Michigan Technological University).

This image is made available under the Creative Commons BY-NC-ND 4.0 license terms.

Galleries: Fieldwork

Keywords: stratigraphy | geology | outcrop | tephra | oxidation | field work | deposit

Atitlán

Agua

Pacaya