These fine-grained ash layers and coarser laminated scoria-bearing layers were deposited by pyroclastic surges following collapse of the summit of Pacaya. This surge deposit overlies the avalanche deposit and the topography in a 90 degree arc as far as 10 km SW of the summit.

Photo by Lee Siebert, 1988 (Smithsonian Institution).

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

Keywords: stratigraphy | geology | outcrop | tephra | deposit

Pacaya