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| Black Butte is a cluster of overlapping dacite lava domes in a butte, a parasitic satellite cone of Mount Shasta. . The highway crosses a 3,912 ft pass, Black Butte Summit, at the western base of the lava domes. The lava domes were extruded at the foot of the cone of Shastina following the period of its major eruptions about 9,000–10,000 years ago. |
copyright © 2000-2013 Bill Taylor , All Rights Reserved
| Karin Doeling | 14-Jun-2013 19:15 | |
| Jim & Josefina | 14-Jun-2012 18:21 | |
| Cedric Sims | 14-Jun-2012 06:08 | |