ClaireDear Claire,
I guess you were traveling through the Raton-Clayton volcanic field. It contains about 125 cinder cones. The cones range in age from greater than a million to a few thousand years old. Some of the cones are associated with lava flows. The youngest cone, Capulin, is also a national monument. Perhaps you stopped there. There is detailed information about the volcanoes of New Mexico in Wood and Kienle.
Steve Mattox, University of North Dakota
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