Elongated Rattlesnake Island near the NE tip of Clear Lake is seen here from the NW. Most of the flat-lying western side of the island is a basaltic-andesite lava flow of late-Pleistocene age. The flow was erupted to the NE and NW from a cinder cone that is the gently rounded ridge that forms the far southern tip of the island at the left. The scoriaceous aa flow was erupted subaerially above the lake level.

Photo by Lee Siebert, 1997 (Smithsonian Institution).

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

Clear Lake Volcanic Field