The middle of three scoria cones with associated andesite lava flows near Davis Lake is seen here from Black Rock Butte, which is the southernmost cone, with the Pleistocene Hamner Butte shield volcano in the background. The middle lava flow has an age of 5,050-5,600 years. The vent that produced the middle flow has a flat summit that has been quarried for road aggregate.

Photo by Lee Siebert, 1995 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Keywords: scoria cone | lava flow | shield volcano

Davis Lake