The 70-sq-km Amboy lava field in southern California is composed mostly of vesicular pahoehoe lava flows that form a hummocky terrain with a surface relief of 2-5 m. Lava tubes are not present in the Amboy flows, which display abundant tumuli and pressure ridges. Light-colored deposits of aeolian sand, thicker to thw SW, fill depressions in the lava flow.

Photo by Paul Kimberly, 1997 (Smithsonian Institution).

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

Amboy