Isla San Luis is seen here from the south with a 2-km-long spit (at low tide) to the lower left. The main features of the island are a rhyolite lava dome forming the NW tip of the island, the darker rhyolitic obsidian dome and coulee in the center, and an eroded tuff ring at the SE tip of the island (to the right). Another tuff ring, Isla Poma, lies 1 km NE of Isla San Luis and is visible to the right.

Photo by Brian Hausback, 2000 (California State University, Sacramento).

This image is made available under the Creative Commons BY-NC 4.0 license terms.

Galleries: Lava Domes

Keywords: island volcano | lava dome | obsidian | tuff ring | erosion | coulee

Isla San Luis