Global Volcanism Program | Image GVP-08773
The small dark-colored pyroclastic cone on the right side of the Grand Canyon at the upper left is Vulcan's Throne, part of the Uinkaret volcanic field, which lies on the north rim of the canyon. Lava flows that originated from the cone can be seen cascading into the Grand Canyon. These flows formed temporary lava dams in the canyon up to 200 m high. Light-colored rocks of the Kaibab Limestone form the steep cliffs bounding the mesa at the right.
Photo by Lee Siebert, 2000 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.