Keywords: Serdán-Oriental.jpg The twin Las Derrumbadas lava domes - the most prominent features of the Serdán-Oriental volcanic field http //www volcano si edu/world/volcano cfm vnum 1401-092 volpage photos photo 076055 1997 Lee Siebert Smithsonian Institution PD Smithsonian Institution is administered by the U S government Photos taken by Smithsonian Institution's employees are thus without restriction confirmed by Mr Edward Venzke from Smithsonian Institution PD-USGov Volcanoes of Mexico Lava domes Volcanic fields |