Basanite, alkali basalt, theoleiitic basalt.
Older lava flows cap mesas on the eastern edge of the field and overlying the monoclinal eastward dipping margin of the Rio Grande rift. Cerro Verde, one of the younger centers of volcanism, us a classic basaltic shield volcan that fed lava flows 42 km long and occupying the margins of the modern Rio San Jose, a eastward draining tributary of the Rio Puerco and Rio Grande.
View Lucero Volcanic Field in a larger map
Baldridge, W. S. Perry, F. V., and Shafiqullah, M., 1987, Late Cenozoic volcanism of the southeastern Colorado Plateau: I. Volcanic geology of the Lucero area, New Mexico: Geological Society of America Bulletin, v. 99, p. 463-470.
Baldridge, W. S , 1990. Lucero, New Mexico; in Wood, C. A., and Kienle, J. (eds), Volcanoes of North America: Cambridge University Press, Cambridge, p. 305-306.