Global Volcanism Program | Image GVP-03658
The walls of two nested summit calderas are seen here in an aerial view of Ceboruco from the NE, with the road to the summit. The formation of the 3.7-km-wide outer caldera was associated with eruption of the 5 km3 Jala Pumice and the Marquesado pyroclastic flow about 1,000 years ago. The Jala Pumice covers broad areas to the north and east.
Photo by Jim Luhr, 1980 (Smithsonian Institution).