Global Volcanism Program | Image GVP-02718
Black Tusk is a glacially eroded lava dome from the earliest stage of activity of the Garibaldi Lake volcanic field about 1 million years ago. The light-colored ridge to the right is a glacial moraine.
Photo by Lee Siebert, 1983 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.