"The Serdán-Oriental is a broad closed basin at the eastern end of the Mexican Altiplano dotted with rhyolitic lava domes, tuff cones, tuff rings, lava flows, and scoria cones of late-Pleistocene to Holocene age. The basin, filled by extensive large lakes during the Pleistocene, is bounded by the Cofre de Perote-Orizaba range on the east and Los Humeros caldera to the north. The most prominent features of the Serdán-Oriental volcanic field are the twin Las Derrumbadas lava domes, surrounded by an apron of debris-avalanche deposits, and the sharp-peaked Cerro Pizarro lava dome at the northern end of the basin. Several of the tuff rings, such as Laguna Atexcac and Laguna Alchichica, are filled with scenic lakes. A major explosive eruption from a vent inferred to be buried within the basin produced the Quetzalapa plinian pumice-fall deposit roughly 20,000 years ago."  -Smithsonian Volcano Archive
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