Global Volcanism Program | Image GVP-03130
Three small scoria cones oriented along a N-S line produced large andesite lava flows. The northernmost flow formed the natural dam that created Davis Lake (right) and the two other flows are located behind Hamner Butte in the background. The middle flow has been radiocarbon dated to about 5,050-5,600 years old; the other two are considered to have erupted at around the same time and are possibly surface manifestations of the same dike.
Photo by Lee Siebert, 1995 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.